diff --git a/deps/+z3/z3.cmake b/deps/+z3/z3.cmake
new file mode 100644
index 0000000000..81736d3766
--- /dev/null
+++ b/deps/+z3/z3.cmake
@@ -0,0 +1,15 @@
+add_cmake_project(z3
+  URL https://github.com/Z3Prover/z3/archive/refs/tags/z3-4.13.0.zip
+  URL_HASH SHA256=81543736dcbbbcb037a7df55d0be596245d509f3f69f56610df32728e48ee050
+  CMAKE_ARGS
+    -DCMAKE_POSITION_INDEPENDENT_CODE=ON
+    -DZ3_INCLUDE_GIT_HASH=OFF
+    -DZ3_INCLUDE_GIT_DESCRIBE=OFF
+    -DZ3_USE_LIB_GMP=OFF
+    -DZ3_BUILD_LIBZ3_SHARED=OFF
+    -DZ3_ENABLE_EXAMPLE_TARGETS=OFF
+    -DZ3_ALWAYS_BUILD_DOCS=OFF
+    -DZ3_BUILD_EXECUTABLE=OFF
+    -DZ3_BUILD_TEST_EXECUTABLES=OFF
+)
+
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7eea9168a2..2bad952679 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -20,6 +20,8 @@ endif ()
 
 add_subdirectory(slic3r-arrange)
 add_subdirectory(slic3r-arrange-wrapper)
+add_subdirectory(libseqarrange)
+
 
 if (SLIC3R_GUI)
     add_subdirectory(libvgcode)
@@ -136,7 +138,8 @@ if (NOT WIN32 AND NOT APPLE)
     set_target_properties(PrusaSlicer PROPERTIES OUTPUT_NAME "prusa-slicer")
 endif ()
 
-target_link_libraries(PrusaSlicer libslic3r libcereal slic3r-arrange-wrapper stb_image)
+
+target_link_libraries(PrusaSlicer libslic3r libcereal slic3r-arrange-wrapper libseqarrange stb_image)
 
 if (APPLE)
 #    add_compile_options(-stdlib=libc++)
diff --git a/src/libseqarrange/CMakeLists.txt b/src/libseqarrange/CMakeLists.txt
new file mode 100644
index 0000000000..b2f56fbd8d
--- /dev/null
+++ b/src/libseqarrange/CMakeLists.txt
@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.10)
+
+add_subdirectory(src)
+add_subdirectory(test)
+
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index 0000000000..3df8886cb3
--- /dev/null
+++ b/src/libseqarrange/data/arrange_data_export.txt
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new file mode 100644
index 0000000000..717147177a
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+    -1876  -127644
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+    -76068  -47354
+  [3]
+    -76068  -127644
+    -1876  -127644
+    -1876  -47354
+    -76068  -47354
+  Displaying ... finised
+Decimation ... finished
+Total CPU time: 0.002
+----------------------------------------------------------------
diff --git a/src/libseqarrange/data/combo_fac.txt b/src/libseqarrange/data/combo_fac.txt
new file mode 100644
index 0000000000..9c97373ccb
--- /dev/null
+++ b/src/libseqarrange/data/combo_fac.txt
@@ -0,0 +1,38 @@
+----------------------------------------------------------------
+Polygon decimation utility - build 173
+(C) 2024 Prusa Research 
+================================================================
+Decimation ...
+  Decimating objects (polygons) ...
+  Decimating objects (polygons) ... finished
+  [0]
+    70757723  18776195
+    87952801  3665480
+    103166346  -1375028
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+  [1]
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+  [2]
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+  [3]
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+    71010674  18899128
+    71010674  18979418
+    70936482  18979418
+  Displaying ... finised
+Decimation ... finished
+Total CPU time: 0.002
+----------------------------------------------------------------
diff --git a/src/libseqarrange/data/combo_fan.txt b/src/libseqarrange/data/combo_fan.txt
new file mode 100644
index 0000000000..343b7e0abf
--- /dev/null
+++ b/src/libseqarrange/data/combo_fan.txt
@@ -0,0 +1,38 @@
+----------------------------------------------------------------
+Polygon decimation utility - build 173
+(C) 2024 Prusa Research 
+================================================================
+Decimation ...
+  Decimating objects (polygons) ...
+  Decimating objects (polygons) ... finished
+  [0]
+    -242277  -223805
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+    -63518  -20582
+  [3]
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+    10674  -100872
+    10674  -20582
+    -63518  -20582
+  Displaying ... finised
+Decimation ... finished
+Total CPU time: 0.002
+----------------------------------------------------------------
diff --git a/src/libseqarrange/data/combo_gantry.txt b/src/libseqarrange/data/combo_gantry.txt
new file mode 100644
index 0000000000..a2531d436d
--- /dev/null
+++ b/src/libseqarrange/data/combo_gantry.txt
@@ -0,0 +1,36 @@
+----------------------------------------------------------------
+Polygon decimation utility - build 173
+(C) 2024 Prusa Research 
+================================================================
+Decimation ...
+  Decimating objects (polygons) ...
+  Decimating objects (polygons) ... finished
+  [0]
+    -206972968  -12664471
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+    -206470468  -5128674
+    -206972968  -5630724
+  [1]
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+    -29076068  18952646
+  [2]
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+    -29068974  18942502
+  [3]
+    -29068966  18882518
+    -29008976  18882518
+    -29008976  18942502
+    -29068966  18942502
+  Displaying ... finised
+Decimation ... finished
+Total CPU time: 0.003
+----------------------------------------------------------------
diff --git a/src/libseqarrange/data/combo_hose.txt b/src/libseqarrange/data/combo_hose.txt
new file mode 100644
index 0000000000..f371e218e6
--- /dev/null
+++ b/src/libseqarrange/data/combo_hose.txt
@@ -0,0 +1,32 @@
+----------------------------------------------------------------
+Polygon decimation utility - build 173
+(C) 2024 Prusa Research 
+================================================================
+Decimation ...
+  Decimating objects (polygons) ...
+  Decimating objects (polygons) ... finished
+  [0]
+    -11942228  -3802359
+    -9008017  -45681679
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+  [2]
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+  [3]
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+    -1876  37872356
+    -1876  37952646
+    -76068  37952646
+  Displaying ... finised
+Decimation ... finished
+Total CPU time: 0.002
+----------------------------------------------------------------
diff --git a/src/libseqarrange/data/combo_nozzle.txt b/src/libseqarrange/data/combo_nozzle.txt
new file mode 100644
index 0000000000..a53a3446ca
--- /dev/null
+++ b/src/libseqarrange/data/combo_nozzle.txt
@@ -0,0 +1,47 @@
+----------------------------------------------------------------
+Polygon decimation utility - build 173
+(C) 2024 Prusa Research 
+================================================================
+Decimation ...
+  Decimating objects (polygons) ...
+  Decimating objects (polygons) ... finished
+  [0]
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+  [1]
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+    3259933  -2422789
+    3728160  1611785
+    468227  4034579
+    -1666062  3111867
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+  [2]
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+    29049  2665786
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+  [3]
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+    2147410  103336
+    1445372  1591511
+    -103328  2147400
+    -1591509  1445366
+  Displaying ... finised
+Decimation ... finished
+Total CPU time: 0.004
+----------------------------------------------------------------
diff --git a/src/libseqarrange/data/export.body.mk4 b/src/libseqarrange/data/export.body.mk4
new file mode 100644
index 0000000000..c7fc21ea8b
--- /dev/null
+++ b/src/libseqarrange/data/export.body.mk4
@@ -0,0 +1,35 @@
+[0]
+{
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+  { -37145411,  -25968391},
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+  { -20142759,  38793397},
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+}
+[1]
+{
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+  { -29076068,  18952646},
+}
+[2]
+{
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+}
+[3]
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+}
diff --git a/src/libseqarrange/data/export.composed.mk4 b/src/libseqarrange/data/export.composed.mk4
new file mode 100644
index 0000000000..17d813ceed
--- /dev/null
+++ b/src/libseqarrange/data/export.composed.mk4
@@ -0,0 +1,90 @@
+[0]
+{
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+}
+[1]
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+[2]
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+[3]
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diff --git a/src/libseqarrange/data/export.fan.mk4 b/src/libseqarrange/data/export.fan.mk4
new file mode 100644
index 0000000000..2a22b9aa68
--- /dev/null
+++ b/src/libseqarrange/data/export.fan.mk4
@@ -0,0 +1,35 @@
+[0]
+{
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+  { -12552212,  59999636},
+  { -29217030,  28440457},
+}
+[1]
+{
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+  { -28989326,  18899128},
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+}
+[2]
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+}
+[3]
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diff --git a/src/libseqarrange/data/export.gantry.mk4 b/src/libseqarrange/data/export.gantry.mk4
new file mode 100644
index 0000000000..458e9f49b4
--- /dev/null
+++ b/src/libseqarrange/data/export.gantry.mk4
@@ -0,0 +1,33 @@
+[0]
+{
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+  { -206470468,  -5128674},
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+}
+[1]
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+}
+[2]
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+}
+[3]
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+  { -29038481,  18869349},
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+}
diff --git a/src/libseqarrange/data/export.hose.mk4 b/src/libseqarrange/data/export.hose.mk4
new file mode 100644
index 0000000000..2988c87b0f
--- /dev/null
+++ b/src/libseqarrange/data/export.hose.mk4
@@ -0,0 +1,29 @@
+[0]
+{
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+  { -20135995,  -20401563},
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+}
+[1]
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+[2]
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+[3]
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diff --git a/src/libseqarrange/data/export.nozzle.mk4 b/src/libseqarrange/data/export.nozzle.mk4
new file mode 100644
index 0000000000..c142366be6
--- /dev/null
+++ b/src/libseqarrange/data/export.nozzle.mk4
@@ -0,0 +1,44 @@
+[0]
+{
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+[1]
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+[2]
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+[3]
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diff --git a/src/libseqarrange/data/extruder_bounding_boxes.mk4.svg b/src/libseqarrange/data/extruder_bounding_boxes.mk4.svg
new file mode 100644
index 0000000000..5510bd66a7
--- /dev/null
+++ b/src/libseqarrange/data/extruder_bounding_boxes.mk4.svg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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diff --git a/src/libseqarrange/data/polygon_test_10.svg b/src/libseqarrange/data/polygon_test_10.svg
new file mode 100644
index 0000000000..066965be10
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_10.svg
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 118 85.9204 168 85.9204 168 135.92 118 135.92 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 6.30135 0 156.301 0 156.301 50 81.3013 120 6.30135 50 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 40 81.4521 80 121.452 40 161.452 0 121.452 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 83.4891 118 103.489 118 123.489 148 93.4891 168 63.4891 148 z" style="fill: grey; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_11.svg b/src/libseqarrange/data/polygon_test_11.svg
new file mode 100644
index 0000000000..bf86bf1797
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_11.svg
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 33.8189 118 83.8189 118 83.8189 168 33.8189 168 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 18 0 168 0 168 50 93 120 18 50 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 127.29 88 167.29 128 127.29 168 87.2896 128 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 20 70.5369 40 70.5369 60 100.537 30 120.537 0 100.537 z" style="fill: grey; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_12.svg b/src/libseqarrange/data/polygon_test_12.svg
new file mode 100644
index 0000000000..31fae7c9b6
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_12.svg
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 37.9963 118 87.9963 118 87.9963 168 37.9963 168 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 18 0 168 0 168 50 93 120 18 50 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 128 87.3358 168 127.336 128 167.336 88 127.336 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 20 73.3246 40 73.3246 60 103.325 30 123.325 0 103.325 z" style="fill: grey; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_13.svg b/src/libseqarrange/data/polygon_test_13.svg
new file mode 100644
index 0000000000..fe37996b40
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_13.svg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 0 0 50 0 50 50 0 50 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 102.293 0 252.293 0 252.293 50 177.293 120 102.293 50 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 60.015 211.871 100.015 251.871 60.015 291.871 20.015 251.871 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 205.99 105.905 225.99 105.905 245.99 135.905 215.99 155.905 185.99 135.905 z" style="fill: grey; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 246 105.898 296 105.898 296 155.898 246 155.898 z" style="fill: cyan; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 146 155.908 296 155.908 296 205.908 221 275.908 146 205.908 z" style="fill: magenta; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 116.182 176.103 156.182 216.103 116.182 256.103 76.1823 216.103 z" style="fill: yellow; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 256 246 276 246 296 276 266 296 236 276 z" style="fill: black; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 246 55.88 296 55.88 296 105.88 246 105.88 z" style="fill: indigo; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 0 94.5333 150 94.5333 150 144.533 75 214.533 0 144.533 z" style="fill: olive; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 156.479 216 196.479 256 156.479 296 116.479 256 z" style="fill: aqua; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 20 181.873 40 181.873 60 211.873 30 231.873 0 211.873 z" style="fill: violet; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_14.svg b/src/libseqarrange/data/polygon_test_14.svg
new file mode 100644
index 0000000000..261d7b5043
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_14.svg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 84.13 118 134.13 118 134.13 168 84.13 168 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 0 0 150 0 150 50 75 120 0 50 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 40 87.3467 80 127.347 40 167.347 0 127.347 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 128 70.5467 148 70.5467 168 100.547 138 120.547 108 100.547 z" style="fill: grey; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 87 211.597 137 211.597 137 261.597 87 261.597 z" style="fill: cyan; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 138 160.597 288 160.597 288 210.597 213 280.597 138 210.597 z" style="fill: magenta; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 208.03 60.5417 248.03 100.542 208.03 140.542 168.03 100.542 z" style="fill: yellow; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
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+   <path d="M 155.923 273.995 205.923 273.995 205.923 323.995 155.923 323.995 z" style="fill: indigo; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 214 16.5054 364 16.5054 364 66.5054 289 136.505 214 66.5054 z" style="fill: olive; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 86.7499 284 126.75 324 86.7499 364 46.7499 324 z" style="fill: aqua; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 288.25 280.847 308.25 280.847 328.25 310.847 298.25 330.847 268.25 310.847 z" style="fill: violet; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_15.svg b/src/libseqarrange/data/polygon_test_15.svg
new file mode 100644
index 0000000000..2235605166
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_15.svg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 2 0 152 0 152 50 77 120 2 50 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 7.7 102 57.7 102 57.7 152 7.7 152 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_7.svg b/src/libseqarrange/data/polygon_test_7.svg
new file mode 100644
index 0000000000..b644da6297
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_7.svg
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 0.00053 0 50.0005 0 50.0005 50 0.00053 50 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 52 13.9993 202 13.9993 202 63.9993 127 133.999 52 63.9993 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 40 52 80 92 40 132 0 92 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_8.svg b/src/libseqarrange/data/polygon_test_8.svg
new file mode 100644
index 0000000000..c4c291a960
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_8.svg
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 0 1.33367 50 1.33367 50 51.3337 0 51.3337 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 52 0 202 0 202 50 127 120 52 50 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 50.0003 52 90.0003 92 50.0003 132 10.0003 92 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/polygon_test_9.svg b/src/libseqarrange/data/polygon_test_9.svg
new file mode 100644
index 0000000000..b3103e86f5
--- /dev/null
+++ b/src/libseqarrange/data/polygon_test_9.svg
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 0 96.0346 50 96.0346 50 146.035 0 146.035 z" style="fill: green; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 2.06865 0 152.069 0 152.069 50 77.0686 120 2.06865 50 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 120 80 160 120 120 160 80 120 z" style="fill: red; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/preprocess_test_1.svg b/src/libseqarrange/data/preprocess_test_1.svg
new file mode 100644
index 0000000000..3aa6f039ce
--- /dev/null
+++ b/src/libseqarrange/data/preprocess_test_1.svg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
+   <path d="M 880 1180 1120 1180 1120 820 880 820 880 1180 z" style="fill: blue; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/data/preprocess_test_2.svg b/src/libseqarrange/data/preprocess_test_2.svg
new file mode 100644
index 0000000000..ce04d17394
--- /dev/null
+++ b/src/libseqarrange/data/preprocess_test_2.svg
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+   <marker id="endArrow" markerHeight="8" markerUnits="strokeWidth" markerWidth="10" orient="auto" refX="1" refY="5" viewBox="0 0 10 10">
+      <polyline fill="darkblue" points="0,0 10,5 0,10 1,5" />
+   </marker>
+<rect fill='white' stroke='none' x='0' y='0' width='2000.000000' height='2000.000000'/>
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diff --git a/src/libseqarrange/data/preprocess_test_3.svg b/src/libseqarrange/data/preprocess_test_3.svg
new file mode 100644
index 0000000000..1d47c3627a
--- /dev/null
+++ b/src/libseqarrange/data/preprocess_test_3.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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diff --git a/src/libseqarrange/data/preprocess_test_4.svg b/src/libseqarrange/data/preprocess_test_4.svg
new file mode 100644
index 0000000000..12b66e42f8
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+++ b/src/libseqarrange/data/preprocess_test_4.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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diff --git a/src/libseqarrange/data/preprocess_test_5.svg b/src/libseqarrange/data/preprocess_test_5.svg
new file mode 100644
index 0000000000..1d9cc83d87
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+++ b/src/libseqarrange/data/preprocess_test_5.svg
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diff --git a/src/libseqarrange/data/preprocess_test_6.svg b/src/libseqarrange/data/preprocess_test_6.svg
new file mode 100644
index 0000000000..f998b9397e
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+++ b/src/libseqarrange/data/preprocess_test_6.svg
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diff --git a/src/libseqarrange/data/sequential_decimator.svg b/src/libseqarrange/data/sequential_decimator.svg
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diff --git a/src/libseqarrange/data/sequential_prusa.svg b/src/libseqarrange/data/sequential_prusa.svg
new file mode 100644
index 0000000000..43d2b9b719
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diff --git a/src/libseqarrange/data/sequential_prusa_000.svg b/src/libseqarrange/data/sequential_prusa_000.svg
new file mode 100644
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diff --git a/src/libseqarrange/data/sequential_prusa_001.svg b/src/libseqarrange/data/sequential_prusa_001.svg
new file mode 100644
index 0000000000..b36a255499
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diff --git a/src/libseqarrange/data/sequential_prusa_002.svg b/src/libseqarrange/data/sequential_prusa_002.svg
new file mode 100644
index 0000000000..eb2d3d95ac
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+++ b/src/libseqarrange/data/sequential_prusa_002.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="2000" width="2000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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diff --git a/src/libseqarrange/data/sequential_test_4.svg b/src/libseqarrange/data/sequential_test_4.svg
new file mode 100644
index 0000000000..f48d4b82c6
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+++ b/src/libseqarrange/data/sequential_test_4.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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diff --git a/src/libseqarrange/data/sequential_test_5.svg b/src/libseqarrange/data/sequential_test_5.svg
new file mode 100644
index 0000000000..57806281ba
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+++ b/src/libseqarrange/data/sequential_test_5.svg
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diff --git a/src/libseqarrange/data/sequential_test_6.svg b/src/libseqarrange/data/sequential_test_6.svg
new file mode 100644
index 0000000000..a2639cc07d
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+++ b/src/libseqarrange/data/sequential_test_6.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
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diff --git a/src/libseqarrange/data/sequential_test_7.svg b/src/libseqarrange/data/sequential_test_7.svg
new file mode 100644
index 0000000000..a544539b56
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+++ b/src/libseqarrange/data/sequential_test_7.svg
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+   <path d="M 197.827 0.53102 247.827 0.53102 247.827 50.531 197.827 50.531 z" style="fill: black; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 52.0285 370 72.0285 370 92.0285 400 62.0285 420 32.0285 400 z" style="fill: indigo; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 132.463 279.541 172.463 319.541 132.463 359.541 92.4628 319.541 z" style="fill: olive; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+   <path d="M 266.443 300 416.443 310 416.443 350 341.443 420 266.443 350 z" style="fill: aqua; stroke: black; stroke-width: 0.000000; fill-type: evenodd"  fill-opacity="1.000000" />
+</svg>
diff --git a/src/libseqarrange/include/seq_defs.hpp b/src/libseqarrange/include/seq_defs.hpp
new file mode 100644
index 0000000000..88104d8301
--- /dev/null
+++ b/src/libseqarrange/include/seq_defs.hpp
@@ -0,0 +1,73 @@
+/*================================================================*/
+/*
+ *  Author:  Pavel Surynek, 2023 - 2023
+ *
+ *  File:    seq_defs.h
+ *
+ *  Definitions of useful macros.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_DEFS_HPP__
+#define __SEQ_DEFS_HPP__
+
+/*----------------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <string>
+#include <vector>
+#include <set>
+
+
+/*----------------------------------------------------------------*/
+
+
+using namespace std;
+
+#define SEQ_UNUSED(x)
+
+//#define DEBUG
+//#define PROFILE
+
+typedef wchar_t wchar;
+
+typedef std::basic_string<char> string;
+typedef std::vector<string> strings_vector;
+typedef std::set<string> strings_set;
+
+
+/*----------------------------------------------------------------*/
+
+extern const string INDENT;
+
+/*----------------------------------------------------------------*/
+
+#define MIN(x,y) (((x) < (y)) ? (x) : (y))
+#define MAX(x,y) (((x) > (y)) ? (x) : (y))
+#define DFR(x,y) (((x) < (y)) ? ((y) - (x)) : ((x) - (y)))
+#define ABS(x) (((x) < 0) ? -(x) : (x))
+#define SGN(x) (((x) < 0) ? -(-1) : ((x) > 0) ? 1 : 0)
+
+
+/*----------------------------------------------------------------*/
+
+#ifdef DEBUG
+  #define ASSERT(condition)                                                             \
+    {                                                                                   \
+      if (!(condition))							                \
+      {                                                                                 \
+        printf("ASSERT: assertion failed (file: %s, line:%d).\n", __FILE__, __LINE__);  \
+	fflush(NULL);                                                                   \
+	exit(-1);						   	                \
+      }                                                                                 \
+    }
+#else
+  #define ASSERT(condition)
+#endif /* DEBUG */
+
+    
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_DEFS_HPP__ */
diff --git a/src/libseqarrange/include/seq_interface.hpp b/src/libseqarrange/include/seq_interface.hpp
new file mode 100644
index 0000000000..a9e41d2a9c
--- /dev/null
+++ b/src/libseqarrange/include/seq_interface.hpp
@@ -0,0 +1,123 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_interface.hpp
+ *
+ * Interface of the sequential printing SMT model for Prusa Slic3r
+ */
+/*================================================================*/
+
+#ifndef __SEQ_INTERFACE_HPP__
+#define __SEQ_INTERFACE_HPP__
+
+
+/*----------------------------------------------------------------*/
+
+#include "libslic3r/Polygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+
+#include "seq_defs.hpp"
+#include "seq_sequential.hpp"
+#include "seq_preprocess.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+using namespace Slic3r;
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+
+    
+/*----------------------------------------------------------------*/
+
+struct ObjectToPrint
+{
+    int id = 0;
+    coord_t total_height = 0;
+    std::vector<std::pair<coord_t, Slic3r::Polygon>> pgns_at_height;
+};
+
+
+struct ScheduledObject {
+    ScheduledObject(int _id, coord_t _x, coord_t _y)
+	: id(_id)
+	, x(_x)
+	, y(_y) { /* */ }
+    
+    int id = 0;
+    coord_t x, y;
+};
+
+
+struct ScheduledPlate {
+    std::vector<ScheduledObject> scheduled_objects;
+};
+
+
+/*----------------------------------------------------------------*/
+/*
+  This is the recommended interface for testing sequential printability.
+
+  Please see the corresponding example of usage (seq_test_interface.cpp)
+
+  Note: The function always succeeds, does not throw any exception.
+*/
+
+bool check_ScheduledObjectsForSequentialPrintability(const SolverConfiguration         &solver_configuration,
+						     const PrinterGeometry             &printer_geometry,
+						     const std::vector<ObjectToPrint>  &objects_to_print,
+						     const std::vector<ScheduledPlate> &scheduled_plates);    
+
+    
+/*----------------------------------------------------------------*/
+/*
+  This is the recommended interface for sequential scheduling/arranging.
+
+  Please see the corresponding example of usage (seq_test_interface.cpp)
+
+  Note: The function should succeed except the case when there is an
+  object that does not fit on the plate and in the case when the solver
+  is unable to scedule even single object on the plate. The latter case
+  is detected by timeout and should not normally happen. These failures
+  are reported via exceptions.
+*/
+
+std::vector<ScheduledPlate> schedule_ObjectsForSequentialPrint(const SolverConfiguration        &solver_configuration,
+							       const PrinterGeometry            &printer_geometry,
+							       const std::vector<ObjectToPrint> &objects_to_print);
+    
+void schedule_ObjectsForSequentialPrint(const SolverConfiguration        &solver_configuration,
+					const PrinterGeometry            &printer_geometry,
+					const std::vector<ObjectToPrint> &objects_to_print,
+					std::vector<ScheduledPlate>      &scheduled_plates);
+    
+    
+/*----------------------------------------------------------------*/
+        
+int schedule_ObjectsForSequentialPrint(const SolverConfiguration        &solver_configuration,
+				       const std::vector<ObjectToPrint> &objects_to_print,
+				       std::vector<ScheduledPlate>      &scheduled_plates);
+
+void setup_ExtruderUnreachableZones(const SolverConfiguration                  &solver_configuration,
+				    std::vector<std::vector<Slic3r::Polygon> > &convex_unreachable_zones,
+				    std::vector<std::vector<Slic3r::Polygon> > &box_unreachable_zones);
+
+int schedule_ObjectsForSequentialPrint(const SolverConfiguration                        &solver_configuration,
+				       const std::vector<ObjectToPrint>                 &objects_to_print,
+				       const std::vector<std::vector<Slic3r::Polygon> > &convex_unreachable_zones,
+				       const std::vector<std::vector<Slic3r::Polygon> > &box_unreachable_zones,     
+				       std::vector<ScheduledPlate>                      &scheduled_plates);
+    
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_INTERFACE_HPP__ */
diff --git a/src/libseqarrange/include/seq_preprocess.hpp b/src/libseqarrange/include/seq_preprocess.hpp
new file mode 100644
index 0000000000..b1f76cee40
--- /dev/null
+++ b/src/libseqarrange/include/seq_preprocess.hpp
@@ -0,0 +1,220 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_preprocess.hpp
+ *
+ * Object preprocessing for the sequential printing SMT model.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_PREPROCESS_HPP__
+#define __SEQ_PREPROCESS_HPP__
+
+
+/*----------------------------------------------------------------*/
+
+#include "seq_sequential.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+
+
+/*----------------------------------------------------------------*/
+
+const double SEQ_POLYGON_DECIMATION_GROW_FACTOR = 1.005;
+  
+
+/*----------------------------------------------------------------*/
+
+struct ObjectToPrint;
+    
+    
+/*----------------------------------------------------------------*/    
+
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S;
+
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_ALL_LEVELS_MK3S;
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK3S;
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK3S;
+
+
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK4;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK4;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK4;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK4;
+
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_ALL_LEVELS_MK4;
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK4;
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK4;
+
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_XL;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_XL;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_XL;
+extern const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_XL;
+
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_ALL_LEVELS_XL;
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_XL;
+extern const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_XL;        
+
+
+/*----------------------------------------------------------------*/
+
+Rational scaleDown_CoordinateForSequentialSolver(coord_t x);
+    
+void scaleDown_PolygonForSequentialSolver(const Slic3r::Polygon &polygon,
+					  Slic3r::Polygon       &scaled_polygon);
+
+void scaleDown_PolygonForSequentialSolver(coord_t                scale_factor,
+					  const Slic3r::Polygon &polygon,
+					  Slic3r::Polygon       &scaled_polygon);
+
+Slic3r::Polygon scaleDown_PolygonForSequentialSolver(coord_t scale_factor, const Slic3r::Polygon &polygon);
+
+
+void scaleUp_PositionForSlicer(const Rational &position_X,
+			       const Rational &position_Y,			       
+			       coord_t        &scaled_position_X,
+			       coord_t        &scaled_position_Y);
+
+void scaleUp_PositionForSlicer(coord_t         scale_factor,
+			       const Rational &position_X,
+			       const Rational &position_Y,			       
+			       coord_t        &scaled_position_X,
+			       coord_t        &scaled_position_Y);    
+
+void scaleUp_PositionForSlicer(double   position_X,
+			       double   position_Y,
+			       coord_t &scaled_position_X,
+			       coord_t &scaled_position_Y);
+
+void scaleUp_PositionForSlicer(coord_t  scale_factor,
+			       double   position_X,
+			       double   position_Y,
+			       coord_t &scaled_position_X,
+			       coord_t &scaled_position_Y);			           
+
+Slic3r::Polygon scaleUp_PolygonForSlicer(const Slic3r::Polygon &polygon);
+Slic3r::Polygon scaleUp_PolygonForSlicer(coord_t scale_factor, const Slic3r::Polygon &polygon);
+    
+Slic3r::Polygon scaleUp_PolygonForSlicer(const Slic3r::Polygon &polygon, double x_pos, double y_pos);
+Slic3r::Polygon scaleUp_PolygonForSlicer(coord_t scale_factor, const Slic3r::Polygon &polygon, double x_pos, double y_pos);    
+    
+void ground_PolygonByBoundingBox(Slic3r::Polygon &polygon);
+void ground_PolygonByFirstPoint(Slic3r::Polygon &polygon);
+    
+void shift_Polygon(Slic3r::Polygon &polygon, coord_t x_offset, coord_t y_offset);
+void shift_Polygon(Slic3r::Polygon &polygon, const Slic3r::Point &offset);    
+
+    
+/*----------------------------------------------------------------*/
+    
+Slic3r::Polygon transform_UpsideDown(const SolverConfiguration &solver_configuration, const Slic3r::Polygon &polygon);
+Slic3r::Polygon transform_UpsideDown(const SolverConfiguration &solver_configuration, coord_t scale_factor, const Slic3r::Polygon &polygon);    
+    
+void transform_UpsideDown(const SolverConfiguration &solver_configuration,
+			  const coord_t             &scaled_x_pos,
+			  const coord_t             &scaled_y_pos,
+			  coord_t                   &transformed_x_pos,
+			  coord_t                   &transformed_y_pos);
+
+void transform_UpsideDown(const SolverConfiguration &solver_configuration,
+			  coord_t                    scale_factor,
+			  const coord_t             &scaled_x_pos,
+			  const coord_t             &scaled_y_pos,
+			  coord_t                   &transformed_x_pos,
+			  coord_t                   &transformed_y_pos);    
+
+    
+/*----------------------------------------------------------------*/
+
+void decimate_PolygonForSequentialSolver(const SolverConfiguration &solver_configuration,
+					 const Slic3r::Polygon     &polygon,
+					 Slic3r::Polygon           &scale_down_polygon);
+
+void decimate_PolygonForSequentialSolver(double                     DP_tolerance,
+					 const Slic3r::Polygon     &polygon,
+					 Slic3r::Polygon           &decimated_polygon);
+
+void extend_PolygonConvexUnreachableZone(const SolverConfiguration          &solver_configuration,
+					 const Slic3r::Polygon              &polygon,
+					 const std::vector<Slic3r::Polygon> &extruder_polygons,
+					 std::vector<Slic3r::Polygon>       &unreachable_polygons);
+
+void extend_PolygonBoxUnreachableZone(const SolverConfiguration          &solver_configuration,
+				      const Slic3r::Polygon              &polygon,
+				      const std::vector<Slic3r::Polygon> &extruder_polygons,
+				      std::vector<Slic3r::Polygon>       &unreachable_polygons);
+
+void extend_PolygonBoxUnreachableZone(const SolverConfiguration          &solver_configuration,
+				      const Slic3r::Polygon              &polygon,
+				      const std::vector<Slic3r::Polygon> &extruder_polygons,
+				      std::vector<Slic3r::Polygon>       &unreachable_polygons);
+
+void prepare_ExtruderPolygons(const SolverConfiguration                  &solver_configuration,
+			      const PrinterGeometry                      &printer_geometry,
+			      const ObjectToPrint                        &object_to_print,
+			      std::vector<Slic3r::Polygon>               &convex_level_polygons,
+			      std::vector<Slic3r::Polygon>               &box_level_polygons,
+			      std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+			      std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons);
+
+void prepare_ObjectPolygons(const SolverConfiguration                        &solver_configuration,
+			    const std::vector<Slic3r::Polygon>               &convex_level_polygons,
+			    const std::vector<Slic3r::Polygon>               &box_level_polygons,
+			    const std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+			    const std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons,
+			    Slic3r::Polygon                                  &object_polygon,
+			    std::vector<Slic3r::Polygon>                     &unreachable_polygons);        
+
+void prepare_UnreachableZonePolygons(const SolverConfiguration                        &solver_configuration,
+				     const Slic3r::Polygon                            &polygon,					
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons,
+				     std::vector<Slic3r::Polygon>                     &unreachable_polygons);
+    
+void prepare_UnreachableZonePolygons(const SolverConfiguration                        &solver_configuration,
+				     const std::vector<Slic3r::Polygon>               &convex_level_polygons,
+				     const std::vector<Slic3r::Polygon>               &box_level_polygons,
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons,
+				     std::vector<Slic3r::Polygon>                     &unreachable_polygons);    
+
+bool check_PolygonSize(const SolverConfiguration &solver_configuration, const Slic3r::Polygon &polygon);
+bool check_PolygonSize(const SolverConfiguration &solver_configuration, coord_t scale_factor, const Slic3r::Polygon &polygon);    
+        
+void simplify_ConvexUnreachablePolygons(const std::vector<std::vector<Slic3r::Polygon> > &unreachable_convex_polygons,
+					std::vector<Slic3r::Polygon>                     &simplified_unreachable_polygons);
+
+
+/*----------------------------------------------------------------*/
+
+double calc_PolygonArea(const Slic3r::Polygon &polygon);
+
+double calc_PolygonUnreachableZoneArea(const Slic3r::Polygon              &polygon,
+				       const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+double calc_PolygonArea(const std::vector<Slic3r::Polygon> &polygons);
+double calc_PolygonArea(const std::vector<int>             &fixed,
+			const std::vector<int>             &undecided,
+			const std::vector<Slic3r::Polygon> &polygons);
+
+double calc_PolygonUnreachableZoneArea(const std::vector<Slic3r::Polygon>               &polygons,
+				       const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_PREPROCESS_HPP__ */
diff --git a/src/libseqarrange/include/seq_sequential.hpp b/src/libseqarrange/include/seq_sequential.hpp
new file mode 100644
index 0000000000..b0cfa51036
--- /dev/null
+++ b/src/libseqarrange/include/seq_sequential.hpp
@@ -0,0 +1,1713 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_sequential.hpp
+ *
+ * SMT models for sequential printing.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_SEQUENTIAL_HPP__
+#define __SEQ_SEQUENTIAL_HPP__
+
+
+/*----------------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <vector>
+
+#include <unordered_map>
+
+#include "libslic3r/Geometry.hpp"
+#include "libslic3r/ExPolygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+
+#include <z3++.h>
+
+#include "seq_defs.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+using namespace Slic3r;
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+
+
+    
+/*----------------------------------------------------------------*/
+
+const coord_t SEQ_SLICER_SCALE_FACTOR = 100000;
+const coord_t SEQ_SVG_SCALE_FACTOR    =  50000;  
+
+    
+#define SEQ_INTERSECTION_REPULSION_MIN    "-0.01"
+#define SEQ_INTERSECTION_REPULSION_MAX    "1.01"
+#define SEQ_TEMPORAL_ABSENCE_THRESHOLD    "-16"
+#define SEQ_TEMPORAL_PRESENCE_THRESHOLD    "16"
+
+#define SEQ_Z3_SOLVER_TIMEOUT              "8000"
+    
+const int SEQ_GROUND_PRESENCE_TIME    = 32;
+const int64_t SEQ_RATIONAL_PRECISION  = 1000;
+const double SEQ_DECIMATION_TOLERANCE = 400000.0;
+
+const double SEQ_DECIMATION_TOLERANCE_VALUE_UNDEFINED = 0.0;    
+const double SEQ_DECIMATION_TOLERANCE_VALUE_LOW       = 150000.0;
+const double SEQ_DECIMATION_TOLERANCE_VALUE_HIGH      = 450000.0;    
+
+    
+/*----------------------------------------------------------------*/
+
+typedef std::basic_string<char> string;
+typedef std::unordered_map<string, int> string_map;
+
+    
+/*----------------------------------------------------------------*/
+
+struct PrinterGeometry
+{
+    coord_t x_size;
+    coord_t y_size;
+    
+    std::set<coord_t> convex_heights;
+    std::set<coord_t> box_heights;
+    
+    std::map<coord_t, std::vector<Slic3r::Polygon> > extruder_slices;
+};
+
+
+/*----------------------------------------------------------------*/
+    
+enum PrinterType
+{
+    SEQ_PRINTER_TYPE_UNDEFINED,
+    SEQ_PRINTER_TYPE_PRUSA_MK3S,
+    SEQ_PRINTER_TYPE_PRUSA_MK4,
+    SEQ_PRINTER_TYPE_PRUSA_XL,    
+};
+
+
+enum DecimationPrecision
+{
+    SEQ_DECIMATION_PRECISION_UNDEFINED,
+    SEQ_DECIMATION_PRECISION_LOW,
+    SEQ_DECIMATION_PRECISION_HIGH    
+};
+
+    
+/*----------------------------------------------------------------*/
+
+const int SEQ_PRUSA_MK3S_X_SIZE = 2500;
+const int SEQ_PRUSA_MK3S_Y_SIZE = 2100;    
+    
+const coord_t SEQ_PRUSA_MK3S_NOZZLE_LEVEL   = 0;
+const coord_t SEQ_PRUSA_MK3S_EXTRUDER_LEVEL = 2000000;
+const coord_t SEQ_PRUSA_MK3S_HOSE_LEVEL     = 18000000;
+const coord_t SEQ_PRUSA_MK3S_GANTRY_LEVEL   = 26000000;
+
+    
+const int SEQ_PRUSA_MK4_X_SIZE = 2500;
+const int SEQ_PRUSA_MK4_Y_SIZE = 2100;    
+
+// TODO: measure for true values    
+const coord_t SEQ_PRUSA_MK4_NOZZLE_LEVEL   = 0;
+const coord_t SEQ_PRUSA_MK4_EXTRUDER_LEVEL = 2000000;
+const coord_t SEQ_PRUSA_MK4_HOSE_LEVEL     = 18000000;
+const coord_t SEQ_PRUSA_MK4_GANTRY_LEVEL   = 26000000;
+
+const int SEQ_PRUSA_XL_X_SIZE = 3600;
+const int SEQ_PRUSA_XL_Y_SIZE = 3600;    
+    
+// TODO: measure for true values    
+const coord_t SEQ_PRUSA_XL_NOZZLE_LEVEL   = 0;
+const coord_t SEQ_PRUSA_XL_EXTRUDER_LEVEL = 2000000;
+const coord_t SEQ_PRUSA_XL_HOSE_LEVEL     = 18000000;
+const coord_t SEQ_PRUSA_XL_GANTRY_LEVEL   = 26000000;        
+    
+
+/*----------------------------------------------------------------*/    
+    
+struct SolverConfiguration
+{
+    SolverConfiguration()
+	: bounding_box_size_optimization_step(4)
+	, minimum_X_bounding_box_size(10)
+	, minimum_Y_bounding_box_size(10)
+	, maximum_X_bounding_box_size(SEQ_PRUSA_MK3S_X_SIZE)
+	, maximum_Y_bounding_box_size(SEQ_PRUSA_MK3S_Y_SIZE)
+	, minimum_bounding_box_size(MIN(minimum_X_bounding_box_size, minimum_Y_bounding_box_size))
+	, maximum_bounding_box_size(MAX(maximum_X_bounding_box_size, maximum_Y_bounding_box_size))
+	, object_group_size(4)
+	, temporal_spread(16)
+	, decimation_precision(SEQ_DECIMATION_PRECISION_UNDEFINED)
+	, printer_type(SEQ_PRINTER_TYPE_PRUSA_MK3S)
+	, optimization_timeout(SEQ_Z3_SOLVER_TIMEOUT)
+    {
+	/* nothing */
+    }
+
+    SolverConfiguration(const PrinterGeometry &printer_geometry)
+	: bounding_box_size_optimization_step(4)
+	, minimum_X_bounding_box_size(10)
+	, minimum_Y_bounding_box_size(10)
+	, maximum_X_bounding_box_size(printer_geometry.x_size / SEQ_SLICER_SCALE_FACTOR)
+	, maximum_Y_bounding_box_size(printer_geometry.y_size / SEQ_SLICER_SCALE_FACTOR)
+	, minimum_bounding_box_size(MIN(minimum_X_bounding_box_size, minimum_Y_bounding_box_size))
+	, maximum_bounding_box_size(MAX(maximum_X_bounding_box_size, maximum_Y_bounding_box_size))
+	, object_group_size(4)
+	, temporal_spread(16)
+	, decimation_precision(SEQ_DECIMATION_PRECISION_UNDEFINED)
+	, printer_type(SEQ_PRINTER_TYPE_PRUSA_MK3S)
+	, optimization_timeout(SEQ_Z3_SOLVER_TIMEOUT)
+    {
+	/* nothing */
+    }
+
+    static double convert_DecimationPrecision2Tolerance(DecimationPrecision decimation_precision)
+    {
+	switch (decimation_precision)
+	{
+	case SEQ_DECIMATION_PRECISION_UNDEFINED:
+	{
+	    return SEQ_DECIMATION_TOLERANCE_VALUE_UNDEFINED;	    
+	    break;
+	}
+	case SEQ_DECIMATION_PRECISION_LOW:
+	{
+	    return SEQ_DECIMATION_TOLERANCE_VALUE_HIGH;
+	    break;
+	}	
+	case SEQ_DECIMATION_PRECISION_HIGH:
+	{
+	    return SEQ_DECIMATION_TOLERANCE_VALUE_LOW;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+	return SEQ_DECIMATION_TOLERANCE_VALUE_UNDEFINED;	
+    }
+
+    void setup(const PrinterGeometry &printer_geometry)
+    {
+	maximum_X_bounding_box_size = printer_geometry.x_size / SEQ_SLICER_SCALE_FACTOR;
+	maximum_Y_bounding_box_size = printer_geometry.y_size / SEQ_SLICER_SCALE_FACTOR;
+	minimum_bounding_box_size = MIN(minimum_X_bounding_box_size, minimum_Y_bounding_box_size);
+	maximum_bounding_box_size = MAX(maximum_X_bounding_box_size, maximum_Y_bounding_box_size);
+    }
+    
+    int bounding_box_size_optimization_step;
+    int minimum_X_bounding_box_size;
+    int minimum_Y_bounding_box_size;        
+    int maximum_X_bounding_box_size;
+    int maximum_Y_bounding_box_size;
+    int minimum_bounding_box_size;
+    int maximum_bounding_box_size;
+    int object_group_size;
+    int temporal_spread;
+
+    DecimationPrecision decimation_precision;
+    PrinterType printer_type;
+    
+    string optimization_timeout;    
+};
+
+
+/*----------------------------------------------------------------*/
+
+struct Rational
+{
+    Rational()
+	: numerator(0)
+	, denominator(1)
+    {
+	/* nothing */
+    }
+
+    Rational(int64_t n)
+	: numerator(n)
+	, denominator(1)	
+    {
+	/* nothing */	
+    }
+    
+    Rational(int64_t n, int64_t d)
+	: numerator(n)
+	, denominator(d)
+    {
+	/* nothing */
+    }
+
+    Rational(const z3::expr &expr)
+    {
+	if (expr.denominator().as_int64() != 0)
+	{
+	    if (expr.numerator().as_int64() != 0)
+	    {
+		numerator = expr.numerator().as_int64();
+		denominator = expr.denominator().as_int64();
+	    }
+	    else
+	    {
+		double expr_val = expr.as_double();
+		if (fabs(expr_val) > EPSILON)
+		{
+		    numerator = expr_val * SEQ_RATIONAL_PRECISION;
+		    denominator = SEQ_RATIONAL_PRECISION;
+		}
+		else
+		{
+		    numerator = 0;
+		    denominator = 1; 
+		}
+	    }
+	}
+	else
+	{
+	    numerator = expr.as_double() * SEQ_RATIONAL_PRECISION;
+	    denominator = SEQ_RATIONAL_PRECISION;
+	}
+    }
+
+    bool is_Positive(void) const
+    {
+	return ((numerator > 0 && denominator > 0) || (numerator < 0 && denominator < 0));
+    }
+
+    bool is_Negative(void) const
+    {	
+	return ((numerator > 0 && denominator < 0) || (numerator < 0 && denominator > 0));	
+    }
+
+    double as_double() const
+    {
+	return (double)numerator / denominator;
+    }
+
+    int64_t as_int64() const
+    {
+	return numerator / denominator;
+    }    
+
+    Rational operator+(int64_t val) const
+    {
+	return Rational(numerator + val * denominator, denominator);
+    }
+
+    Rational operator*(int64_t val) const
+    {
+	return Rational(numerator * val, denominator);
+    }
+
+    Rational normalize(void) const
+    {
+	return Rational(as_double() * SEQ_RATIONAL_PRECISION, SEQ_RATIONAL_PRECISION);
+    }
+
+    bool operator<(const Rational &rational) const
+    {
+	return (as_double() < rational.as_double());
+    }
+    
+    bool operator>(const Rational &rational) const
+    {
+	return (as_double() > rational.as_double());
+    }
+    
+    int64_t numerator;
+    int64_t denominator;
+};
+
+
+/*----------------------------------------------------------------*/
+
+bool lines_intersect_(coord_t ax, coord_t ay, coord_t ux, coord_t uy, coord_t bx, coord_t by, coord_t vx, coord_t vy);
+bool lines_intersect(double ax, double ay, double ux, double uy, double bx, double by, double vx, double vy);
+bool lines_intersect_closed(double ax, double ay, double ux, double uy, double bx, double by, double vx, double vy);
+bool lines_intersect_open(double ax, double ay, double ux, double uy, double bx, double by, double vx, double vy);
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_DecisionBox(z3::solver     &Solver,
+			   const z3::expr &dec_var_X,
+			   const z3::expr &dec_var_Y,
+			   int             box_size_x,
+			   int             box_size_y);
+
+void assume_DecisionBox(const z3::expr  &dec_var_X,
+			const z3::expr  &dec_var_Y,
+			int              box_size_x,
+			int              box_size_y,
+			z3::expr_vector &box_constraints);
+
+
+void introduce_BedBoundingBox(z3::solver            &Solver,
+			      const z3::expr        &dec_var_X,
+			      const z3::expr        &dec_var_Y,			      
+			      const Slic3r::Polygon &polygon,
+			      int                    box_size_x,
+			      int                    box_size_y);
+
+void assume_BedBoundingBox(const z3::expr        &dec_var_X,
+			   const z3::expr        &dec_var_Y,			      
+			   const Slic3r::Polygon &polygon,
+			   int                    box_size_x,
+			   int                    box_size_y,
+			   z3::expr_vector       &bounding_constraints);
+
+void introduce_BedBoundingBox(z3::solver            &Solver,
+			      const z3::expr        &dec_var_X,
+			      const z3::expr        &dec_var_Y,			      
+			      const Slic3r::Polygon &polygon,
+			      int                    box_min_x,
+			      int                    box_min_y,
+			      int                    box_max_x,
+			      int                    box_max_y);
+			      
+
+void assume_BedBoundingBox(const z3::expr        &dec_var_X,
+			   const z3::expr        &dec_var_Y,			      
+			   const Slic3r::Polygon &polygon,
+			   int                    box_min_x,
+			   int                    box_min_y,
+			   int                    box_max_x,
+			   int                    box_max_y,			   
+			   z3::expr_vector       &bounding_constraints);
+
+void introduce_BedBoundingBox(z3::solver                         &Solver,
+			      const z3::expr_vector              &dec_vars_X,
+			      const z3::expr_vector              &dec_vars_Y,
+			      const std::vector<Slic3r::Polygon> &polygons,
+			      int                                 box_size_x,
+			      int                                 box_size_y);
+
+void assume_BedBoundingBox(const z3::expr_vector              &dec_vars_X,
+			   const z3::expr_vector              &dec_vars_Y,
+			   const std::vector<Slic3r::Polygon> &polygons,
+			   int                                 box_size_x,
+			   int                                 box_size_y,
+			   z3::expr_vector                    &bounding_constraints);
+
+void introduce_BedBoundingBox(z3::solver                         &Solver,
+			      const z3::expr_vector              &dec_vars_X,
+			      const z3::expr_vector              &dec_vars_Y,
+			      const std::vector<Slic3r::Polygon> &polygons,
+			      int                                 box_min_x,
+			      int                                 box_min_y,			   
+			      int                                 box_max_x,
+			      int                                 box_max_y);
+
+void assume_BedBoundingBox(const z3::expr_vector              &dec_vars_X,
+			   const z3::expr_vector              &dec_vars_Y,
+			   const std::vector<Slic3r::Polygon> &polygons,
+			   int                                 box_min_x,
+			   int                                 box_min_y,
+			   int                                 box_max_x,
+			   int                                 box_max_y,			   
+			   z3::expr_vector                    &bounding_constraints);
+
+void assume_ConsequentialObjectPresence(z3::context            &Context,
+					const z3::expr_vector  &dec_vars_T,
+					const std::vector<int> &present,
+					const std::vector<int> &missing,
+					z3::expr_vector        &presence_constraints);
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_TemporalOrdering(z3::solver                         &Solver,
+				z3::context                        &Context,
+				const z3::expr_vector              &dec_vars_T,
+				int                                temporal_spread,
+				const std::vector<Slic3r::Polygon> &polygons);
+
+void introduce_SequentialTemporalOrderingAgainstFixed(z3::solver                         &Solver,
+						      z3::context                        &Context,
+						      const z3::expr_vector              &dec_vars_T,
+						      std::vector<Rational>              &dec_values_T,
+						      const std::vector<int>             &fixed,
+						      const std::vector<int>             &undecided,				
+						      int                                temporal_spread,
+						      const std::vector<Slic3r::Polygon> &polygons);
+
+void introduce_ConsequentialTemporalOrderingAgainstFixed(z3::solver                         &Solver,
+							 z3::context                        &Context,
+							 const z3::expr_vector              &dec_vars_T,
+							 std::vector<Rational>              &dec_values_T,
+							 const std::vector<int>             &fixed,
+							 const std::vector<int>             &undecided,				
+							 int                                temporal_spread,
+							 const std::vector<Slic3r::Polygon> &polygons);
+
+/*----------------------------------------------------------------*/
+
+void introduce_LineNonIntersection(z3::solver         &Solver,
+				   z3::context        &Context,				   
+				   const z3::expr     &dec_var_X1,
+				   const z3::expr     &dec_var_Y1,
+				   const z3::expr     &dec_var_T1,
+				   const Slic3r::Line &line1,
+				   const z3::expr     &dec_var_X2,
+				   const z3::expr     &dec_var_Y2,
+				   const z3::expr     &dec_var_T2,				   
+				   const Slic3r::Line &line2);
+
+void introduce_SequentialLineNonIntersection(z3::solver         &Solver,
+					     z3::context        &Context,					     
+					     const z3::expr     &dec_var_X1,
+					     const z3::expr     &dec_var_Y1,
+					     const z3::expr     &dec_var_T1,
+					     const z3::expr     &dec_var_t1,
+					     const Slic3r::Line &line1,
+					     const z3::expr     &dec_var_X2,
+					     const z3::expr     &dec_var_Y2,
+					     const z3::expr     &dec_var_T2,
+					     const z3::expr     &dec_var_t2,
+					     const Slic3r::Line &line2);
+
+void introduce_ConsequentialLineNonIntersection(z3::solver         &Solver,
+						z3::context        &Context,					     
+						const z3::expr     &dec_var_X1,
+						const z3::expr     &dec_var_Y1,
+						const z3::expr     &dec_var_T1,
+						const z3::expr     &dec_var_t1,
+						const Slic3r::Line &line1,
+						const z3::expr     &dec_var_X2,
+						const z3::expr     &dec_var_Y2,
+						const z3::expr     &dec_var_T2,
+						const z3::expr     &dec_var_t2,
+						const Slic3r::Line &line2);
+
+void introduce_LineNonIntersection_implicit(z3::solver         &Solver,
+					    z3::context        &Context,					    
+					    const z3::expr     &dec_var_X1,
+					    const z3::expr     &dec_var_Y1,
+					    const z3::expr     &dec_var_T1,
+					    const Slic3r::Line &line1,
+					    const z3::expr     &dec_var_X2,
+					    const z3::expr     &dec_var_Y2,
+					    const z3::expr     &dec_var_T2,				   
+					    const Slic3r::Line &line2);
+
+void introduce_SequentialLineNonIntersection_implicit(z3::solver         &Solver,
+						      z3::context        &Context,						      
+						      const z3::expr     &dec_var_X1,
+						      const z3::expr     &dec_var_Y1,
+						      const z3::expr     &dec_var_T1,
+						      const z3::expr     &dec_var_t1,
+						      const Slic3r::Line &line1,
+						      const z3::expr     &dec_var_X2,
+						      const z3::expr     &dec_var_Y2,
+						      const z3::expr     &dec_var_T2,
+						      const z3::expr     &dec_var_t2,
+						      const Slic3r::Line &line2);
+
+void introduce_ConsequentialLineNonIntersection_implicit(z3::solver         &Solver,
+							 z3::context        &Context,						      
+							 const z3::expr     &dec_var_X1,
+							 const z3::expr     &dec_var_Y1,
+							 const z3::expr     &dec_var_T1,
+							 const z3::expr     &dec_var_t1,
+							 const Slic3r::Line &line1,
+							 const z3::expr     &dec_var_X2,
+							 const z3::expr     &dec_var_Y2,
+							 const z3::expr     &dec_var_T2,
+							 const z3::expr     &dec_var_t2,
+							 const Slic3r::Line &line2);
+
+void introduce_LineNonIntersection_explicit(z3::solver         &Solver,
+					    z3::context        &Context,					    
+					    const z3::expr     &dec_var_X1,
+					    const z3::expr     &dec_var_Y1,
+					    const z3::expr     &dec_var_T1,				   
+					    const Slic3r::Line &line1,
+					    const z3::expr     &dec_var_X2,
+					    const z3::expr     &dec_var_Y2,
+					    const z3::expr     &dec_var_T2,				   
+					    const Slic3r::Line &line2);
+
+void introduce_LineNonIntersectionAgainstFixedLine(z3::solver         &Solver,
+						   z3::context        &Context,
+						   const z3::expr     &dec_var_X1,
+						   const z3::expr     &dec_var_Y1,
+						   const z3::expr     &dec_var_T1,
+						   const Slic3r::Line &line1,
+						   const Rational     &dec_value_X2,
+						   const Rational     &dec_value_Y2,
+						   const z3::expr     &dec_var_T2,				   
+						   const Slic3r::Line &line2);
+
+void introduce_SequentialLineNonIntersectionAgainstFixedLine(z3::solver         &Solver,
+							     z3::context        &Context,
+							     const z3::expr     &dec_var_X1,
+							     const z3::expr     &dec_var_Y1,
+							     const z3::expr     &dec_var_T1,
+							     const z3::expr     &dec_var_t1,
+							     const Slic3r::Line &line1,
+							     const Rational     &dec_value_X2,
+							     const Rational     &dec_value_Y2,
+							     const Rational     &dec_value_T2,
+							     const z3::expr     &dec_var_t2,
+							     const Slic3r::Line &line2);
+
+void introduce_SequentialFixedLineNonIntersectionAgainstLine(z3::solver         &Solver,
+							     z3::context        &Context,
+							     const Rational     &dec_value_X1,
+							     const Rational     &dec_value_Y1,
+							     const Rational     &dec_value_T1,
+							     const z3::expr     &dec_var_t1,
+							     const Slic3r::Line &line1,
+							     const z3::expr     &dec_var_X2,
+							     const z3::expr     &dec_var_Y2,
+							     const z3::expr     &dec_var_T2,
+							     const z3::expr     &dec_var_t2,
+							     const Slic3r::Line &line2);
+
+void introduce_ConsequentialLineNonIntersectionAgainstFixedLine(z3::solver         &Solver,
+								z3::context        &Context,
+								const z3::expr     &dec_var_X1,
+								const z3::expr     &dec_var_Y1,
+								const z3::expr     &dec_var_T1,
+								const z3::expr     &dec_var_t1,
+								const Slic3r::Line &line1,
+								const Rational     &dec_value_X2,
+								const Rational     &dec_value_Y2,
+								const Rational     &dec_value_T2,
+								const z3::expr     &dec_var_t2,
+								const Slic3r::Line &line2);
+
+void introduce_ConsequentialFixedLineNonIntersectionAgainstLine(z3::solver         &Solver,
+								z3::context        &Context,
+								const Rational     &dec_value_X1,
+								const Rational     &dec_value_Y1,
+								const Rational     &dec_value_T1,
+								const z3::expr     &dec_var_t1,
+								const Slic3r::Line &line1,
+								const z3::expr     &dec_var_X2,
+								const z3::expr     &dec_var_Y2,
+								const z3::expr     &dec_var_T2,
+								const z3::expr     &dec_var_t2,
+							     const Slic3r::Line &line2);
+
+void introduce_LineNonIntersectionAgainstFixedLine_implicit(z3::solver         &Solver,
+							    z3::context        &Context,
+							    const z3::expr     &dec_var_X1,
+							    const z3::expr     &dec_var_Y1,
+							    const z3::expr     &dec_var_T1,
+							    const Slic3r::Line &line1,
+							    const Rational     &dec_value_X2,
+							    const Rational     &dec_value_Y2,
+							    const z3::expr     &dec_var_T2,
+							    const Slic3r::Line &line2);
+
+void introduce_LineNonIntersectionAgainstFixedLine_explicit(z3::solver         &Solver,
+							    z3::context        &Context,
+							    const z3::expr     &dec_var_X1,
+							    const z3::expr     &dec_var_Y1,
+							    const z3::expr     &dec_var_T1,
+							    const Slic3r::Line &line1,
+							    const Rational     &dec_value_X2,
+							    const Rational     &dec_value_Y2,
+							    const z3::expr     &dec_var_T2,
+							    const Slic3r::Line &line2);
+
+void introduce_SequentialLineNonIntersectionAgainstFixedLine_implicit(z3::solver         &Solver,
+								      z3::context        &Context,
+								      const z3::expr     &dec_var_X1,
+								      const z3::expr     &dec_var_Y1,
+								      const z3::expr     &dec_var_T1,
+								      const z3::expr     &dec_var_t1,
+								      const Slic3r::Line &line1,
+								      const Rational     &dec_value_X2,
+								      const Rational     &dec_value_Y2,
+								      const Rational     &dec_value_T2,
+								      const z3::expr     &dec_var_t2,
+								      const Slic3r::Line &line2);
+
+void introduce_SequentialFixedLineNonIntersectionAgainstLine_implicit(z3::solver         &Solver,
+								      z3::context        &Context,
+								      const Rational     &dec_value_X1,
+								      const Rational     &dec_value_Y1,
+								      const Rational     &dec_value_T1,
+								      const z3::expr     &dec_var_t1,
+								      const Slic3r::Line &line1,
+								      const z3::expr     &dec_var_X2,
+								      const z3::expr     &dec_var_Y2,
+								      const z3::expr     &dec_var_T2,
+								      const z3::expr     &dec_var_t2,
+								      const Slic3r::Line &line2);
+
+void introduce_ConsequentialLineNonIntersectionAgainstFixedLine_implicit(z3::solver         &Solver,
+									 z3::context        &Context,
+									 const z3::expr     &dec_var_X1,
+									 const z3::expr     &dec_var_Y1,
+									 const z3::expr     &dec_var_T1,
+									 const z3::expr     &dec_var_t1,
+									 const Slic3r::Line &line1,
+									 const Rational     &dec_value_X2,
+									 const Rational     &dec_value_Y2,
+									 const Rational     &dec_value_T2,
+									 const z3::expr     &dec_var_t2,
+									 const Slic3r::Line &line2);
+
+void introduce_ConsequentialFixedLineNonIntersectionAgainstLine_implicit(z3::solver         &Solver,
+									 z3::context        &Context,
+									 const Rational     &dec_value_X1,
+									 const Rational     &dec_value_Y1,
+									 const Rational     &dec_value_T1,
+									 const z3::expr     &dec_var_t1,
+									 const Slic3r::Line &line1,
+									 const z3::expr     &dec_var_X2,
+									 const z3::expr     &dec_var_Y2,
+									 const z3::expr     &dec_var_T2,
+									 const z3::expr     &dec_var_t2,
+									 const Slic3r::Line &line2);
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_PointInsideHalfPlane(z3::solver         &Solver,
+				    const z3::expr     &dec_var_X1,
+				    const z3::expr     &dec_var_Y1,
+				    const z3::expr     &dec_var_X2,
+				    const z3::expr     &dec_var_Y2,
+				    const Slic3r::Line &halving_line);
+
+void introduce_PointOutsideHalfPlane(z3::solver         &Solver,
+				     const z3::expr     &dec_var_X1,
+				     const z3::expr     &dec_var_Y1,
+				     const z3::expr     &dec_var_X2,
+				     const z3::expr     &dec_var_Y2,
+				     const Slic3r::Line &halving_line);
+
+void introduce_PointInsidePolygon(z3::solver            &Solver,
+				  z3::context           &Context,			      
+				  const z3::expr        &dec_var_X1,
+				  const z3::expr        &dec_var_Y1,
+				  const z3::expr        &dec_var_X2,
+				  const z3::expr        &dec_var_Y2,
+				  const Slic3r::Polygon &polygon);
+
+void introduce_PointOutsidePolygon(z3::solver            &Solver,
+				   z3::context           &Context,			      
+				   const z3::expr        &dec_var_X1,
+				   const z3::expr        &dec_var_Y1,
+				   const z3::expr        &dec_var_X2,
+				   const z3::expr        &dec_var_Y2,
+				   const Slic3r::Polygon &polygon);
+
+void introduce_SequentialPointOutsidePolygon(z3::solver            &Solver,
+					     z3::context           &Context,			      
+					     const z3::expr        &dec_var_X1,
+					     const z3::expr        &dec_var_Y1,
+					     const z3::expr        &dec_var_T1,					     
+					     const z3::expr        &dec_var_X2,
+					     const z3::expr        &dec_var_Y2,
+					     const z3::expr        &dec_var_T2,
+					     const Slic3r::Polygon &polygon);
+
+void introduce_ConsequentialPointOutsidePolygon(z3::solver            &Solver,
+						z3::context           &Context,			      
+						const z3::expr        &dec_var_X1,
+						const z3::expr        &dec_var_Y1,
+						const z3::expr        &dec_var_T1,					     
+						const z3::expr        &dec_var_X2,
+						const z3::expr        &dec_var_Y2,
+						const z3::expr        &dec_var_T2,
+						const Slic3r::Polygon &polygon);
+
+void introduce_FixedPointOutsidePolygon(z3::solver            &Solver,
+					z3::context           &Context,
+					double                 dec_value_X1,
+					double                 dec_value_Y1,					
+					const z3::expr        &dec_var_X2,
+					const z3::expr        &dec_var_Y2,
+					const Slic3r::Polygon &polygon);
+
+void introduce_FixedPointOutsidePolygon(z3::solver            &Solver,
+					z3::context           &Context,
+					const Rational        &dec_value_X2,
+					const Rational        &dec_value_Y2,					
+					const z3::expr        &dec_var_X2,
+					const z3::expr        &dec_var_Y2,
+					const Slic3r::Polygon &polygon);
+
+void introduce_SequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const Rational        &dec_value_X1,
+						  const Rational        &dec_value_Y1,
+						  const Rational        &dec_value_T1,
+						  const z3::expr        &dec_var_X2,
+						  const z3::expr        &dec_var_Y2,
+						  const z3::expr        &dec_var_T2,
+						  const Slic3r::Polygon &polygon);
+
+void introduce_SequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const Rational        &dec_value_X1,
+						  const Rational        &dec_value_Y1,
+						  const z3::expr        &dec_var_T1,
+						  const z3::expr        &dec_var_X2,
+						  const z3::expr        &dec_var_Y2,
+						  const Rational        &dec_value_T2,
+						  const Slic3r::Polygon &polygon);
+
+void introduce_ConsequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const Rational        &dec_value_X1,
+						     const Rational        &dec_value_Y1,
+						     const Rational        &dec_value_T1,
+						     const z3::expr        &dec_var_X2,
+						     const z3::expr        &dec_var_Y2,
+						     const z3::expr        &dec_var_T2,
+						     const Slic3r::Polygon &polygon);
+
+void introduce_ConsequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const Rational        &dec_value_X1,
+						     const Rational        &dec_value_Y1,
+						     const z3::expr        &dec_var_T1,
+						     const z3::expr        &dec_var_X2,
+						     const z3::expr        &dec_var_Y2,
+						     const Rational        &dec_value_T2,
+						     const Slic3r::Polygon &polygon);
+
+void introduce_PointOutsideFixedPolygon(z3::solver            &Solver,
+					z3::context           &Context,			      
+					const z3::expr        &dec_var_X1,
+					const z3::expr        &dec_var_Y1,
+					double                 dec_value_X2,
+					double                 dec_value_Y2,
+					const Slic3r::Polygon &polygon);
+
+void introduce_PointOutsideFixedPolygon(z3::solver            &Solver,
+					z3::context           &Context,
+					const z3::expr        &dec_var_X1,
+					const z3::expr        &dec_var_Y1,
+					const Rational        &dec_value_X2,
+					const Rational        &dec_value_Y2,
+					const Slic3r::Polygon &polygon);
+
+void introduce_SequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const z3::expr        &dec_var_X1,
+						  const z3::expr        &dec_var_Y1,
+						  const z3::expr        &dec_var_T1,
+						  const Rational        &dec_value_X2,
+						  const Rational        &dec_value_Y2,
+						  const Rational        &dec_value_T2,
+						  const Slic3r::Polygon &polygon);
+
+void introduce_SequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const z3::expr        &dec_var_X1,
+						  const z3::expr        &dec_var_Y1,
+						  const Rational        &dec_value_T1,
+						  const Rational        &dec_value_X2,
+						  const Rational        &dec_value_Y2,
+						  const z3::expr        &dec_var_T2,
+						  const Slic3r::Polygon &polygon);
+
+void introduce_ConsequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const z3::expr        &dec_var_X1,
+						     const z3::expr        &dec_var_Y1,
+						     const z3::expr        &dec_var_T1,
+						     const Rational        &dec_value_X2,
+						     const Rational        &dec_value_Y2,
+						     const Rational        &dec_value_T2,
+						     const Slic3r::Polygon &polygon);
+
+void introduce_ConsequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const z3::expr        &dec_var_X1,
+						     const z3::expr        &dec_var_Y1,
+						     const Rational        &dec_value_T1,
+						     const Rational        &dec_value_X2,
+						     const Rational        &dec_value_Y2,
+						     const z3::expr        &dec_var_T2,
+						     const Slic3r::Polygon &polygon);
+
+void introduce_PolygonOutsidePolygon(z3::solver            &Solver,
+				     z3::context           &Context,
+				     const z3::expr        &dec_var_X1,
+				     const z3::expr        &dec_var_Y1,
+				     const Slic3r::Polygon &polygon1,
+				     const z3::expr        &dec_var_X2,
+				     const z3::expr        &dec_var_Y2,
+				     const Slic3r::Polygon &polygon2);
+
+void introduce_PolygonOutsideFixedPolygon(z3::solver            &Solver,
+					  z3::context           &Context,
+					  const z3::expr        &dec_var_X1,
+					  const z3::expr        &dec_var_Y1,
+					  const Slic3r::Polygon &polygon1,
+					  double                 dec_value_X2,
+					  double                 dec_value_Y2,
+					  const Slic3r::Polygon &polygon2);
+
+void introduce_PolygonOutsideFixedPolygon(z3::solver            &Solver,
+					  z3::context           &Context,
+					  const z3::expr        &dec_var_X1,
+					  const z3::expr        &dec_var_Y1,
+					  const Slic3r::Polygon &polygon1,
+					  const Rational        &dec_value_X2,
+					  const Rational        &dec_value_Y2,
+					  const Slic3r::Polygon &polygon2);
+
+void introduce_SequentialPolygonOutsidePolygon(z3::solver            &Solver,
+					       z3::context           &Context,
+					       const z3::expr        &dec_var_X1,
+					       const z3::expr        &dec_var_Y1,
+					       const z3::expr        &dec_var_T1,
+					       const Slic3r::Polygon &polygon1,
+					       const Slic3r::Polygon &unreachable_polygon1,
+					       const z3::expr        &dec_var_X2,
+					       const z3::expr        &dec_var_Y2,
+					       const z3::expr        &dec_var_T2,
+					       const Slic3r::Polygon &polygon2,
+					       const Slic3r::Polygon &unreachable_polygon2);
+
+void introduce_SequentialPolygonOutsidePolygon(z3::solver                         &Solver,
+					       z3::context                        &Context,
+					       const z3::expr                     &dec_var_X1,
+					       const z3::expr                     &dec_var_Y1,
+					       const z3::expr                     &dec_var_T1,
+					       const Slic3r::Polygon              &polygon1,
+					       const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+					       const z3::expr                     &dec_var_X2,
+					       const z3::expr                     &dec_var_Y2,
+					       const z3::expr                     &dec_var_T2,
+					       const Slic3r::Polygon              &polygon2,
+					       const std::vector<Slic3r::Polygon> &unreachable_polygons2);
+
+void introduce_SequentialPolygonOutsideFixedPolygon(z3::solver            &Solver,
+						    z3::context           &Context,
+						    const z3::expr        &dec_var_X1,
+						    const z3::expr        &dec_var_Y1,
+						    const z3::expr        &dec_var_T1,
+						    const Slic3r::Polygon &polygon1,
+						    const Slic3r::Polygon &unreachable_polygon1,
+						    const Rational        &dec_value_X2,
+						    const Rational        &dec_value_Y2,
+						    const Rational        &dec_value_T2,
+						    const Slic3r::Polygon &polygon2,
+						    const Slic3r::Polygon &unreachable_polygon2);
+
+void introduce_SequentialPolygonOutsideFixedPolygon(z3::solver                         &Solver,
+						    z3::context                        &Context,
+						    const z3::expr                     &dec_var_X1,
+						    const z3::expr                     &dec_var_Y1,
+						    const z3::expr                     &dec_var_T1,
+						    const Slic3r::Polygon              &polygon1,
+						    const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						    const Rational                     &dec_value_X2,
+						    const Rational                     &dec_value_Y2,
+						    const Rational                     &dec_value_T2,
+						    const Slic3r::Polygon              &polygon2,
+						    const std::vector<Slic3r::Polygon> &unreachable_polygons2);
+
+void introduce_ConsequentialPolygonOutsidePolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const z3::expr        &dec_var_X1,
+						  const z3::expr        &dec_var_Y1,
+						  const z3::expr        &dec_var_T1,
+						  const Slic3r::Polygon &polygon1,
+						  const Slic3r::Polygon &unreachable_polygon1,
+						  const z3::expr        &dec_var_X2,
+						  const z3::expr        &dec_var_Y2,
+						  const z3::expr        &dec_var_T2,
+						  const Slic3r::Polygon &polygon2,
+						  const Slic3r::Polygon &unreachable_polygon2);
+
+void introduce_ConsequentialPolygonOutsidePolygon(z3::solver                         &Solver,
+						  z3::context                        &Context,
+						  const z3::expr                     &dec_var_X1,
+						  const z3::expr                     &dec_var_Y1,
+						  const z3::expr                     &dec_var_T1,
+						  const Slic3r::Polygon              &polygon1,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						  const z3::expr                     &dec_var_X2,
+						  const z3::expr                     &dec_var_Y2,
+						  const z3::expr                     &dec_var_T2,
+						  const Slic3r::Polygon              &polygon2,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons2);
+
+void introduce_ConsequentialPolygonExternalPolygon(z3::solver            &Solver,
+						   z3::context           &Context,
+						   const z3::expr        &dec_var_X1,
+						   const z3::expr        &dec_var_Y1,
+						   const z3::expr        &dec_var_T1,
+						   const Slic3r::Polygon &polygon1,
+						   const Slic3r::Polygon &unreachable_polygon1,
+						   const z3::expr        &dec_var_X2,
+						   const z3::expr        &dec_var_Y2,
+						   const z3::expr        &dec_var_T2,
+						   const Slic3r::Polygon &polygon2,
+						   const Slic3r::Polygon &unreachable_polygon2);
+
+void introduce_ConsequentialPolygonExternalPolygon(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr                     &dec_var_X1,
+						   const z3::expr                     &dec_var_Y1,
+						   const z3::expr                     &dec_var_T1,
+						   const Slic3r::Polygon              &polygon1,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						   const z3::expr                     &dec_var_X2,
+						   const z3::expr                     &dec_var_Y2,
+						   const z3::expr                     &dec_var_T2,
+						   const Slic3r::Polygon              &polygon2,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons2);
+
+void introduce_ConsequentialPolygonOutsideFixedPolygon(z3::solver            &Solver,
+						       z3::context           &Context,
+						       const z3::expr        &dec_var_X1,
+						       const z3::expr        &dec_var_Y1,
+						       const z3::expr        &dec_var_T1,
+						       const Slic3r::Polygon &polygon1,
+						       const Slic3r::Polygon &unreachable_polygon1,
+						       const Rational        &dec_value_X2,
+						       const Rational        &dec_value_Y2,
+						       const Rational        &dec_value_T2,
+						       const Slic3r::Polygon &polygon2,
+						       const Slic3r::Polygon &unreachable_polygon2);
+
+void introduce_ConsequentialPolygonOutsideFixedPolygon(z3::solver                         &Solver,
+						       z3::context                        &Context,
+						       const z3::expr                     &dec_var_X1,
+						       const z3::expr                     &dec_var_Y1,
+						       const z3::expr                     &dec_var_T1,
+						       const Slic3r::Polygon              &polygon1,
+						       const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						       const Rational                     &dec_value_X2,
+						       const Rational                     &dec_value_Y2,
+						       const Rational                     &dec_value_T2,
+						       const Slic3r::Polygon              &polygon2,
+						       const std::vector<Slic3r::Polygon> &unreachable_polygons2);
+
+void introduce_ConsequentialPolygonExternalFixedPolygon(z3::solver            &Solver,
+							z3::context           &Context,
+							const z3::expr        &dec_var_X1,
+							const z3::expr        &dec_var_Y1,
+							const z3::expr        &dec_var_T1,
+							const Slic3r::Polygon &polygon1,
+							const Slic3r::Polygon &unreachable_polygon1,
+							const Rational        &dec_value_X2,
+							const Rational        &dec_value_Y2,
+							const Rational        &dec_value_T2,
+							const Slic3r::Polygon &polygon2,
+							const Slic3r::Polygon &unreachable_polygon2);
+
+void introduce_ConsequentialPolygonExternalFixedPolygon(z3::solver                         &Solver,
+							z3::context                        &Context,
+							const z3::expr                     &dec_var_X1,
+							const z3::expr                     &dec_var_Y1,
+							const z3::expr                     &dec_var_T1,
+							const Slic3r::Polygon              &polygon1,
+							const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+							const Rational                     &dec_value_X2,
+							const Rational                     &dec_value_Y2,
+							const Rational                     &dec_value_T2,
+							const Slic3r::Polygon              &polygon2,
+							const std::vector<Slic3r::Polygon> &unreachable_polygons2);
+
+void introduce_PolygonLineNonIntersection(z3::solver            &Solver,
+					  z3::context           &Context,
+					  const z3::expr        &dec_var_X1,
+					  const z3::expr        &dec_var_Y1,
+					  const Slic3r::Polygon &polygon1,
+					  const z3::expr        &dec_var_X2,
+					  const z3::expr        &dec_var_Y2,
+					  const Slic3r::Polygon &polygon2);
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+					 z3::context                        &Context,
+					 const z3::expr_vector              &dec_vars_X,
+					 const z3::expr_vector              &dec_vars_Y,
+					 const std::vector<Slic3r::Polygon> &polygons);
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						      z3::context                        &Context,
+						      const z3::expr_vector              &dec_vars_X,
+						      const z3::expr_vector              &dec_vars_Y,
+						      const z3::expr_vector              &dec_vars_T,
+						      const std::vector<Slic3r::Polygon> &polygons,
+						      const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						      z3::context                                      &Context,
+						      const z3::expr_vector                            &dec_vars_X,
+						      const z3::expr_vector                            &dec_vars_Y,
+						      const z3::expr_vector                            &dec_vars_T,
+						      const std::vector<Slic3r::Polygon>               &polygons,
+						      const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+void introduce_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+					 z3::context                        &Context,
+					 const z3::expr_vector              &dec_vars_X,
+					 const z3::expr_vector              &dec_vars_Y,
+					 std::vector<Rational>              &dec_values_X,
+					 std::vector<Rational>              &dec_values_Y,
+					 const std::vector<int>             &fixed,
+					 const std::vector<int>             &undecided,
+					 const std::vector<Slic3r::Polygon> &polygons);
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   std::vector<Rational>              &dec_values_X,
+						   std::vector<Rational>              &dec_values_Y,
+						   std::vector<Rational>              &dec_values_T,
+						   const std::vector<int>             &fixed,
+						   const std::vector<int>             &undecided,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,
+						   std::vector<Rational>                            &dec_values_X,
+						   std::vector<Rational>                            &dec_values_Y,
+						   std::vector<Rational>                            &dec_values_T,
+						   const std::vector<int>                           &fixed,
+						   const std::vector<int>                           &undecided,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						      z3::context                        &Context,
+						      const z3::expr_vector              &dec_vars_X,
+						      const z3::expr_vector              &dec_vars_Y,
+						      const z3::expr_vector              &dec_vars_T,
+						      std::vector<Rational>              &dec_values_X,
+						      std::vector<Rational>              &dec_values_Y,
+						      std::vector<Rational>              &dec_values_T,
+						      const std::vector<int>             &fixed,
+						      const std::vector<int>             &undecided,
+						      const std::vector<Slic3r::Polygon> &polygons,
+						      const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						      z3::context                                      &Context,
+						      const z3::expr_vector                            &dec_vars_X,
+						      const z3::expr_vector                            &dec_vars_Y,
+						      const z3::expr_vector                            &dec_vars_T,
+						      std::vector<Rational>                            &dec_values_X,
+						      std::vector<Rational>                            &dec_values_Y,
+						      std::vector<Rational>                            &dec_values_T,
+						      const std::vector<int>                           &fixed,
+						      const std::vector<int>                           &undecided,
+						      const std::vector<Slic3r::Polygon>               &polygons,
+						      const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+void introduce_PolygonStrongNonoverlapping(z3::solver                         &Solver,
+					   z3::context                        &Context,
+					   const z3::expr_vector              &dec_vars_X,
+					   const z3::expr_vector              &dec_vars_Y,
+					   const std::vector<Slic3r::Polygon> &polygons);
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const std::vector<double>          &dec_values_X,
+				      const std::vector<double>          &dec_values_Y,
+				      const std::vector<Slic3r::Polygon> &polygons);
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const z3::expr_vector              &dec_values_X,
+				      const z3::expr_vector              &dec_values_Y,
+				      const std::vector<Slic3r::Polygon> &polygons);
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const std::vector<Rational>        &dec_values_X,
+				      const std::vector<Rational>        &dec_values_Y,
+				      const std::vector<Slic3r::Polygon> &polygons);
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						z3::context                        &Context,
+						const z3::expr_vector              &dec_vars_X,
+						const z3::expr_vector              &dec_vars_Y,
+						const z3::expr_vector              &dec_vars_T,
+						const std::vector<double>          &dec_values_X,
+						const std::vector<double>          &dec_values_Y,
+						const std::vector<double>          &dec_values_T,
+						const std::vector<Slic3r::Polygon> &polygons,
+						const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						z3::context                        &Context,
+						const z3::expr_vector              &dec_vars_X,
+						const z3::expr_vector              &dec_vars_Y,
+						const z3::expr_vector              &dec_vars_T,
+						const std::vector<Rational>        &dec_values_X,
+						const std::vector<Rational>        &dec_values_Y,
+						const std::vector<Rational>        &dec_values_T,
+						const std::vector<Slic3r::Polygon> &polygons,
+						const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						z3::context                                      &Context,
+						const z3::expr_vector                            &dec_vars_X,
+						const z3::expr_vector                            &dec_vars_Y,
+						const z3::expr_vector                            &dec_vars_T,
+						const std::vector<Rational>                      &dec_values_X,
+						const std::vector<Rational>                      &dec_values_Y,
+						const std::vector<Rational>                      &dec_values_T,
+						const std::vector<Slic3r::Polygon>               &polygons,
+						const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   const std::vector<double>          &dec_values_X,
+						   const std::vector<double>          &dec_values_Y,
+						   const std::vector<double>          &dec_values_T,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   const std::vector<Rational>        &dec_values_X,
+						   const std::vector<Rational>        &dec_values_Y,
+						   const std::vector<Rational>        &dec_values_T,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,
+						   const std::vector<Rational>                      &dec_values_X,
+						   const std::vector<Rational>                      &dec_values_Y,
+						   const std::vector<Rational>                      &dec_values_T,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_PolygonWeakNonoverlappingAgainstFixed(z3::solver                         &Solver,
+						     z3::context                        &Context,
+						     const z3::expr_vector              &dec_vars_X,
+						     const z3::expr_vector              &dec_vars_Y,
+						     const z3::expr_vector              &dec_values_X,
+						     const z3::expr_vector              &dec_values_Y,
+						     const std::vector<int>             &fixed,
+						     const std::vector<int>             &undecided,
+						     const std::vector<Slic3r::Polygon> &polygons);
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const z3::expr_vector              &dec_values_X,
+				      const z3::expr_vector              &dec_values_Y,
+				      const std::vector<int>             &fixed,
+				      const std::vector<int>             &undecided,
+				      const std::vector<Slic3r::Polygon> &polygons);
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const std::vector<Rational>        &dec_values_X,
+				      const std::vector<Rational>        &dec_values_Y,
+				      const std::vector<int>             &fixed,
+				      const std::vector<int>             &undecided,
+				      const std::vector<Slic3r::Polygon> &polygons);
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						z3::context                        &Context,
+						const z3::expr_vector              &dec_vars_X,
+						const z3::expr_vector              &dec_vars_Y,
+						const z3::expr_vector              &dec_vars_T,
+						const std::vector<Rational>        &dec_values_X,
+						const std::vector<Rational>        &dec_values_Y,
+						const std::vector<Rational>        &dec_values_T,
+						const std::vector<int>             &fixed,
+						const std::vector<int>             &undecided,
+						const std::vector<Slic3r::Polygon> &polygons,
+						const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						z3::context                                      &Context,
+						const z3::expr_vector                            &dec_vars_X,
+						const z3::expr_vector                            &dec_vars_Y,
+						const z3::expr_vector                            &dec_vars_T,
+						const std::vector<Rational>                      &dec_values_X,
+						const std::vector<Rational>                      &dec_values_Y,
+						const std::vector<Rational>                      &dec_values_T,
+						const std::vector<int>                           &fixed,
+						const std::vector<int>                           &undecided,
+						const std::vector<Slic3r::Polygon>               &polygons,
+						const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   const std::vector<Rational>        &dec_values_X,
+						   const std::vector<Rational>        &dec_values_Y,
+						   const std::vector<Rational>        &dec_values_T,
+						   const std::vector<int>             &fixed,
+						   const std::vector<int>             &undecided,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,
+						   const std::vector<Rational>                      &dec_values_X,
+						   const std::vector<Rational>                      &dec_values_Y,
+						   const std::vector<Rational>                      &dec_values_T,
+						   const std::vector<int>                           &fixed,
+						   const std::vector<int>                           &undecided,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+
+/*----------------------------------------------------------------*/
+
+bool check_PointsOutsidePolygons(const std::vector<Rational>                      &dec_values_X,
+				 const std::vector<Rational>                      &dec_values_Y,	
+				 const std::vector<Rational>                      &dec_values_T,
+				 const std::vector<Slic3r::Polygon>               &polygons,
+				 const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool check_PolygonLineIntersections(const std::vector<Rational>                      &dec_values_X,
+				    const std::vector<Rational>                      &dec_values_Y,	
+				    const std::vector<Rational>                      &dec_values_T,
+				    const std::vector<Slic3r::Polygon>               &polygons,
+				    const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);    
+
+
+/*----------------------------------------------------------------*/
+
+void extract_DecisionValuesFromModel(const z3::model     &Model,
+				     const string_map    &dec_var_names_map,
+				     std::vector<double> &dec_values_X,
+				     std::vector<double> &dec_values_Y);
+
+void extract_DecisionValuesFromModel(const z3::model     &Model,
+				     z3::context         &Context,				     
+				     const string_map    &dec_var_names_map,
+				     z3::expr_vector     &dec_values_X,
+				     z3::expr_vector     &dec_values_Y);
+
+void extract_DecisionValuesFromModel(const z3::model       &Model,
+				     const string_map      &dec_var_names_map,
+				     std::vector<Rational> &dec_values_X,
+				     std::vector<Rational> &dec_values_Y);
+
+void extract_DecisionValuesFromModel(const z3::model       &Model,
+				     const string_map      &dec_var_names_map,
+				     std::vector<Rational> &dec_values_X,
+				     std::vector<Rational> &dec_values_Y,
+				     std::vector<Rational> &dec_values_T);
+
+void build_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+				     z3::context                        &Context,
+				     const std::vector<Slic3r::Polygon> &polygons,
+				     z3::expr_vector                    &dec_vars_X,
+				     z3::expr_vector                    &dec_vars_Y,
+				     std::vector<double>                &dec_values_X,
+				     std::vector<double>                &dec_values_Y,
+				     string_map                         &dec_var_names_map);
+
+void build_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+				     z3::context                        &Context,
+				     const std::vector<Slic3r::Polygon> &polygons,
+				     z3::expr_vector                    &dec_vars_X,
+				     z3::expr_vector                    &dec_vars_Y,
+				     z3::expr_vector                    &dec_values_X,
+				     z3::expr_vector                    &dec_values_Y,
+				     string_map                         &dec_var_names_map);
+
+void build_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+				     z3::context                        &Context,
+				     const std::vector<Slic3r::Polygon> &polygons,
+				     z3::expr_vector                    &dec_vars_X,
+				     z3::expr_vector                    &dec_vars_Y,
+				     std::vector<Rational>              &dec_values_X,
+				     std::vector<Rational>              &dec_values_Y,
+				     string_map                         &dec_var_names_map);
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					std::vector<double>                &dec_values_X,
+					std::vector<double>                &dec_values_Y,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons);
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					z3::expr_vector                    &dec_values_X,
+					z3::expr_vector                    &dec_values_Y,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons);
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					std::vector<Rational>              &dec_values_X,
+					std::vector<Rational>              &dec_values_Y,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons);
+
+/*----------------------------------------------------------------*/
+
+void build_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+				     z3::context                        &Context,
+				     const std::vector<Slic3r::Polygon> &polygons,
+				     z3::expr_vector                    &dec_vars_X,
+				     z3::expr_vector                    &dec_vars_Y,
+				     std::vector<Rational>              &dec_values_X,
+				     std::vector<Rational>              &dec_values_Y,
+				     const std::vector<int>             &fixed,
+				     const std::vector<int>             &undecided,
+				     string_map                         &dec_var_names_map);
+
+void build_SequentialWeakPolygonNonoverlapping(z3::solver                         &Solver,
+					       z3::context                        &Context,
+					       const std::vector<Slic3r::Polygon> &polygons,
+					       const std::vector<Slic3r::Polygon> &unreachable_polygons,
+					       z3::expr_vector                    &dec_vars_X,
+					       z3::expr_vector                    &dec_vars_Y,
+					       z3::expr_vector                    &dec_vars_T,
+					       std::vector<Rational>              &dec_values_X,
+					       std::vector<Rational>              &dec_values_Y,
+					       std::vector<Rational>              &dec_values_T,
+					       const std::vector<int>             &fixed,
+					       const std::vector<int>             &undecided,
+					       string_map                         &dec_var_names_map);
+
+void build_SequentialWeakPolygonNonoverlapping(z3::solver                                       &Solver,
+					       z3::context                                      &Context,
+					       const std::vector<Slic3r::Polygon>               &polygons,
+					       const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+					       z3::expr_vector                                  &dec_vars_X,
+					       z3::expr_vector                                  &dec_vars_Y,
+					       z3::expr_vector                                  &dec_vars_T,
+					       std::vector<Rational>                            &dec_values_X,
+					       std::vector<Rational>                            &dec_values_Y,
+					       std::vector<Rational>                            &dec_values_T,
+					       const std::vector<int>                           &fixed,
+					       const std::vector<int>                           &undecided,
+					       string_map                                       &dec_var_names_map);
+
+void build_ConsequentialWeakPolygonNonoverlapping(z3::solver                         &Solver,
+						  z3::context                        &Context,
+						  const std::vector<Slic3r::Polygon> &polygons,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons,
+						  z3::expr_vector                    &dec_vars_X,
+						  z3::expr_vector                    &dec_vars_Y,
+						  z3::expr_vector                    &dec_vars_T,
+						  std::vector<Rational>              &dec_values_X,
+						  std::vector<Rational>              &dec_values_Y,
+						  std::vector<Rational>              &dec_values_T,
+						  const std::vector<int>             &fixed,
+						  const std::vector<int>             &undecided,
+						  string_map                         &dec_var_names_map);
+
+void build_ConsequentialWeakPolygonNonoverlapping(z3::solver                                       &Solver,
+						  z3::context                                      &Context,
+						  const std::vector<Slic3r::Polygon>               &polygons,
+						  const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+						  z3::expr_vector                                  &dec_vars_X,
+						  z3::expr_vector                                  &dec_vars_Y,
+						  z3::expr_vector                                  &dec_vars_T,
+						  std::vector<Rational>                            &dec_values_X,
+						  std::vector<Rational>                            &dec_values_Y,
+						  std::vector<Rational>                            &dec_values_T,
+						  const std::vector<int>                           &fixed,
+						  const std::vector<int>                           &undecided,
+						  string_map                                       &dec_var_names_map);
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					z3::expr_vector                    &dec_values_X,
+					z3::expr_vector                    &dec_values_Y,
+					const std::vector<int>             &fixed,
+					const std::vector<int>             &undecided,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons);
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					std::vector<Rational>              &dec_values_X,
+					std::vector<Rational>              &dec_values_Y,
+					const std::vector<int>             &fixed,
+					const std::vector<int>             &undecided,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons);
+
+bool optimize_SequentialWeakPolygonNonoverlapping(z3::solver                         &Solver,
+						  z3::context                        &Context,
+						  const SolverConfiguration          &solver_configuration,
+						  const z3::expr_vector              &dec_vars_X,
+						  const z3::expr_vector              &dec_vars_Y,
+						  const z3::expr_vector              &dec_vars_T,
+						  std::vector<Rational>              &dec_values_X,
+						  std::vector<Rational>              &dec_values_Y,
+						  std::vector<Rational>              &dec_values_T,
+						  const std::vector<int>             &fixed,
+						  const std::vector<int>             &undecided,
+						  const string_map                   &dec_var_names_map,
+						  const std::vector<Slic3r::Polygon> &polygons,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons);
+
+bool optimize_SequentialWeakPolygonNonoverlapping(z3::solver                                       &Solver,
+						  z3::context                                      &Context,
+						  const SolverConfiguration                        &solver_configuration,
+						  const z3::expr_vector                            &dec_vars_X,
+						  const z3::expr_vector                            &dec_vars_Y,
+						  const z3::expr_vector                            &dec_vars_T,
+						  std::vector<Rational>                            &dec_values_X,
+						  std::vector<Rational>                            &dec_values_Y,
+						  std::vector<Rational>                            &dec_values_T,
+						  const std::vector<int>                           &fixed,
+						  const std::vector<int>                           &undecided,
+						  const string_map                                 &dec_var_names_map,
+						  const std::vector<Slic3r::Polygon>               &polygons,
+						  const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool optimize_SequentialWeakPolygonNonoverlappingCentered(z3::solver                                       &Solver,
+							  z3::context                                      &Context,
+							  const SolverConfiguration                        &solver_configuration,
+							  const z3::expr_vector                            &dec_vars_X,
+							  const z3::expr_vector                            &dec_vars_Y,
+							  const z3::expr_vector                            &dec_vars_T,
+							  std::vector<Rational>                            &dec_values_X,
+							  std::vector<Rational>                            &dec_values_Y,
+							  std::vector<Rational>                            &dec_values_T,
+							  const std::vector<int>                           &fixed,
+							  const std::vector<int>                           &undecided,
+							  const string_map                                 &dec_var_names_map,
+							  const std::vector<Slic3r::Polygon>               &polygons,
+							  const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool checkArea_SequentialWeakPolygonNonoverlapping(coord_t                                           box_min_x,
+						   coord_t                                           box_min_y,
+						   coord_t                                           box_max_x,
+						   coord_t                                           box_max_y,
+						   const std::vector<int>                           &fixed,
+						   const std::vector<int>                           &undecided,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool checkExtens_SequentialWeakPolygonNonoverlapping(coord_t                                           box_min_x,
+						     coord_t                                           box_min_y,
+						     coord_t                                           box_max_x,
+						     coord_t                                           box_max_y,
+						     std::vector<Rational>                            &dec_values_X,
+						     std::vector<Rational>                            &dec_values_Y,
+						     const std::vector<int>                           &fixed,
+						     const std::vector<int>                           &undecided,
+						     const std::vector<Slic3r::Polygon>               &polygons,
+						     const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool optimize_SequentialWeakPolygonNonoverlappingBinaryCentered(z3::solver                                       &Solver,
+								z3::context                                      &Context,
+								const SolverConfiguration                        &solver_configuration,
+								int                                              &box_half_x_max,
+								int                                              &box_half_y_max,
+								const z3::expr_vector                            &dec_vars_X,
+								const z3::expr_vector                            &dec_vars_Y,
+								const z3::expr_vector                            &dec_vars_T,
+								std::vector<Rational>                            &dec_values_X,
+								std::vector<Rational>                            &dec_values_Y,
+								std::vector<Rational>                            &dec_values_T,
+								const std::vector<int>                           &fixed,
+								const std::vector<int>                           &undecided,
+								const string_map                                 &dec_var_names_map,
+								const std::vector<Slic3r::Polygon>               &polygons,
+								const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+bool optimize_ConsequentialWeakPolygonNonoverlappingBinaryCentered(z3::solver                                       &Solver,
+								   z3::context                                      &Context,
+								   const SolverConfiguration                        &solver_configuration,
+								   int                                              &box_half_x_max,
+								   int                                              &box_half_y_max,
+								   const z3::expr_vector                            &dec_vars_X,
+								   const z3::expr_vector                            &dec_vars_Y,
+								   const z3::expr_vector                            &dec_vars_T,
+								   std::vector<Rational>                            &dec_values_X,
+								   std::vector<Rational>                            &dec_values_Y,
+								   std::vector<Rational>                            &dec_values_T,
+								   const std::vector<int>                           &fixed,
+								   const std::vector<int>                           &undecided,
+								   const string_map                                 &dec_var_names_map,
+								   const std::vector<Slic3r::Polygon>               &polygons,
+								   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+
+
+/*----------------------------------------------------------------*/
+
+void augment_TemporalSpread(const SolverConfiguration &solver_configuration,
+			    std::vector<Rational>     &dec_values_T,
+			    const std::vector<int>    &decided_polygons);
+
+
+bool optimize_SubglobalPolygonNonoverlapping(const SolverConfiguration          &solver_configuration,
+					     std::vector<Rational>              &dec_values_X,
+					     std::vector<Rational>              &dec_values_Y,
+					     const std::vector<Slic3r::Polygon> &polygons,
+					     const std::vector<int>             &undecided_polygons,
+					     std::vector<int>                   &decided_polygons,
+					     std::vector<int>                   &remaining_polygons);
+
+bool optimize_SubglobalSequentialPolygonNonoverlapping(const SolverConfiguration          &solver_configuration,
+						       std::vector<Rational>              &dec_values_X,
+						       std::vector<Rational>              &dec_values_Y,
+						       std::vector<Rational>              &dec_values_T,
+						       const std::vector<Slic3r::Polygon> &polygons,
+						       const std::vector<Slic3r::Polygon> &unreachable_polygons,
+						       const std::vector<int>             &undecided_polygons,
+						       std::vector<int>                   &decided_polygons,
+						       std::vector<int>                   &remaining_polygons);
+
+bool optimize_SubglobalSequentialPolygonNonoverlapping(const SolverConfiguration                        &solver_configuration,
+						       std::vector<Rational>                            &dec_values_X,
+						       std::vector<Rational>                            &dec_values_Y,
+						       std::vector<Rational>                            &dec_values_T,
+						       const std::vector<Slic3r::Polygon>               &polygons,
+						       const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+						       const std::vector<int>                           &undecided_polygons,
+						       std::vector<int>                                 &decided_polygons,
+						       std::vector<int>                                 &remaining_polygons);
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingCentered(const SolverConfiguration          &solver_configuration,
+							       std::vector<Rational>              &dec_values_X,
+							       std::vector<Rational>              &dec_values_Y,
+							       std::vector<Rational>              &dec_values_T,
+							       const std::vector<Slic3r::Polygon> &polygons,
+							       const std::vector<Slic3r::Polygon> &unreachable_polygons,
+							       const std::vector<int>             &undecided_polygons,
+							       std::vector<int>                   &decided_polygons,
+							       std::vector<int>                   &remaining_polygons);
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingCentered(const SolverConfiguration                        &solver_configuration,
+							       std::vector<Rational>                            &dec_values_X,
+							       std::vector<Rational>                            &dec_values_Y,
+							       std::vector<Rational>                            &dec_values_T,
+							       const std::vector<Slic3r::Polygon>               &polygons,
+							       const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+							       const std::vector<int>                           &undecided_polygons,
+							       std::vector<int>                                 &decided_polygons,
+							       std::vector<int>                                 &remaining_polygons);
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration          &solver_configuration,
+								     std::vector<Rational>              &dec_values_X,
+								     std::vector<Rational>              &dec_values_Y,
+								     std::vector<Rational>              &dec_values_T,
+								     const std::vector<Slic3r::Polygon> &polygons,
+								     const std::vector<Slic3r::Polygon> &unreachable_polygons,
+								     const std::vector<int>             &undecided_polygons,
+								     std::vector<int>                   &decided_polygons,
+								     std::vector<int>                   &remaining_polygons);
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration                        &solver_configuration,
+								     std::vector<Rational>                            &dec_values_X,
+								     std::vector<Rational>                            &dec_values_Y,
+								     std::vector<Rational>                            &dec_values_T,
+								     const std::vector<Slic3r::Polygon>               &polygons,
+								     const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+								     const std::vector<int>                           &undecided_polygons,
+								     std::vector<int>                                 &decided_polygons,
+								     std::vector<int>                                 &remaining_polygons);
+
+
+bool optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration          &solver_configuration,
+									std::vector<Rational>              &dec_values_X,
+									std::vector<Rational>              &dec_values_Y,
+									std::vector<Rational>              &dec_values_T,
+									const std::vector<Slic3r::Polygon> &polygons,
+									const std::vector<Slic3r::Polygon> &unreachable_polygons,
+									const std::vector<int>             &undecided_polygons,
+									std::vector<int>                   &decided_polygons,
+									std::vector<int>                   &remaining_polygons);
+
+bool optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration                        &solver_configuration,
+									std::vector<Rational>                            &dec_values_X,
+									std::vector<Rational>                            &dec_values_Y,
+									std::vector<Rational>                            &dec_values_T,
+									const std::vector<Slic3r::Polygon>               &polygons,
+									const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+									const std::vector<int>                           &undecided_polygons,
+									std::vector<int>                                 &decided_polygons,
+									std::vector<int>                                 &remaining_polygons);
+
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_SEQUENTIAL_HPP__ */
diff --git a/src/libseqarrange/include/seq_step b/src/libseqarrange/include/seq_step
new file mode 100644
index 0000000000..66321c084c
--- /dev/null
+++ b/src/libseqarrange/include/seq_step
@@ -0,0 +1 @@
+189
\ No newline at end of file
diff --git a/src/libseqarrange/include/seq_utilities.hpp b/src/libseqarrange/include/seq_utilities.hpp
new file mode 100644
index 0000000000..76b95bb8b4
--- /dev/null
+++ b/src/libseqarrange/include/seq_utilities.hpp
@@ -0,0 +1,47 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_utilities.hpp
+ *
+ * Various utilities for sequential print.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_UTILITIES_HPP__
+#define __SEQ_UTILITIES_HPP__
+
+
+/*----------------------------------------------------------------*/
+
+#include "seq_sequential.hpp"
+#include "seq_interface.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+
+    
+bool find_and_remove(std::string& src, const std::string& key);
+std::vector<ObjectToPrint> load_exported_data(const std::string& filename);
+    
+int load_printer_geometry(const std::string& filename, PrinterGeometry &printer_geometry);
+
+void save_import_data(const std::string           &filename,
+		      const std::map<double, int> &scheduled_polygons,
+		      const map<int, int>         &original_index_map,
+		      const vector<Rational>      &poly_positions_X,
+		      const vector<Rational>      &poly_positions_Y);
+
+    
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_UTILITIES_HPP__ */
diff --git a/src/libseqarrange/include/seq_version.hpp b/src/libseqarrange/include/seq_version.hpp
new file mode 100644
index 0000000000..803b4440dc
--- /dev/null
+++ b/src/libseqarrange/include/seq_version.hpp
@@ -0,0 +1,7 @@
+#ifndef __SEQ_VERSION_HPP__
+#define __SEQ_VERSION_HPP__
+
+
+#define SEQ_SEQUENTIAL_BUILD "189"
+
+#endif /* __SEQ_VERSION_HPP__ */
diff --git a/src/libseqarrange/include/seq_version.sh b/src/libseqarrange/include/seq_version.sh
new file mode 100644
index 0000000000..2e4b64d125
--- /dev/null
+++ b/src/libseqarrange/include/seq_version.sh
@@ -0,0 +1,7 @@
+echo "#ifndef __SEQ_VERSION_HPP__"
+echo "#define __SEQ_VERSION_HPP__"
+echo ""
+echo ""
+echo "#define SEQ_SEQUENTIAL_BUILD "\"`cat ./SEQUENTIAL-Prusa/include/seq_step`\"
+echo ""
+echo "#endif /* __SEQ_VERSION_HPP__ */"
diff --git a/src/libseqarrange/printers/printer_geometry.mk3s.txt b/src/libseqarrange/printers/printer_geometry.mk3s.txt
new file mode 100644
index 0000000000..514216fc13
--- /dev/null
+++ b/src/libseqarrange/printers/printer_geometry.mk3s.txt
@@ -0,0 +1,31 @@
+X_SIZE250000000
+Y_SIZE210000000
+
+CONVEX_HEIGHT0
+CONVEX_HEIGHT2000000
+BOX_HEIGHT18000000
+BOX_HEIGHT26000000
+
+POLYGON_AT_HEIGHT0
+POINT-500000 -500000
+POINT500000 -500000
+POINT500000 500000
+POINT-500000 500000
+
+POLYGON_AT_HEIGHT2000000
+POINT-2000000 -10000000
+POINT2000000 -10000000
+POINT2000000 2000000
+POINT-2000000 2000000
+	
+POLYGON_AT_HEIGHT18000000
+POINT-1000000 500000
+POINT1000000 500000
+POINT1000000 -250000000
+POINT-1000000 -250000000
+
+POLYGON_AT_HEIGHT26000000
+POINT-250000000 2000000
+POINT250000000 2000000	
+POINT250000000 2100000
+POINT-250000000 2100000
diff --git a/src/libseqarrange/printers/printer_geometry.mk4.compatibility.txt b/src/libseqarrange/printers/printer_geometry.mk4.compatibility.txt
new file mode 100644
index 0000000000..3b1cd0706c
--- /dev/null
+++ b/src/libseqarrange/printers/printer_geometry.mk4.compatibility.txt
@@ -0,0 +1,43 @@
+X_SIZE250000000
+Y_SIZE210000000
+
+CONVEX_HEIGHT0
+CONVEX_HEIGHT2000000
+BOX_HEIGHT18000000
+BOX_HEIGHT26000000
+
+POLYGON_AT_HEIGHT0
+POINT-500000 -500000
+POINT500000 -500000
+POINT500000 500000
+POINT-500000 500000
+
+POLYGON_AT_HEIGHT2000000
+POINT-1000000 -21000000	
+POINT37000000 -21000000
+POINT37000000  44000000
+POINT-1000000  44000000
+	
+POLYGON_AT_HEIGHT2000000
+POINT-40000000 -45000000
+POINT38000000 -45000000
+POINT38000000  20000000
+POINT-40000000  20000000
+
+POLYGON_AT_HEIGHT18000000
+POINT-350000000 -4000000
+POINT350000000 -4000000
+POINT350000000 -14000000
+POINT-350000000 -14000000
+
+POLYGON_AT_HEIGHT26000000
+POINT-12000000 -350000000
+POINT9000000 -350000000
+POINT9000000 -39000000
+POINT-12000000 -39000000
+
+POLYGON_AT_HEIGHT26000000
+POINT-12000000 -350000000
+POINT250000000 -350000000
+POINT250000000  -82000000
+POINT-12000000  -82000000
diff --git a/src/libseqarrange/printers/printer_geometry.mk4.txt b/src/libseqarrange/printers/printer_geometry.mk4.txt
new file mode 100644
index 0000000000..159a779980
--- /dev/null
+++ b/src/libseqarrange/printers/printer_geometry.mk4.txt
@@ -0,0 +1,45 @@
+X_SIZE250000000
+Y_SIZE210000000
+
+CONVEX_HEIGHT0
+CONVEX_HEIGHT3000000
+BOX_HEIGHT11000000
+BOX_HEIGHT13000000
+
+POLYGON_AT_HEIGHT0
+POINT-500000 -500000
+POINT500000 -500000
+POINT500000 500000
+POINT-500000 500000
+
+POLYGON_AT_HEIGHT3000000
+POINT-1000000 -21000000	
+POINT37000000 -21000000
+POINT37000000  44000000
+POINT-1000000  44000000
+	
+POLYGON_AT_HEIGHT3000000
+POINT-40000000 -45000000
+POINT38000000 -45000000
+POINT38000000  20000000
+POINT-40000000  20000000
+
+POLYGON_AT_HEIGHT11000000
+POINT-350000000 -4000000
+POINT350000000 -4000000
+POINT350000000 -14000000
+POINT-350000000 -14000000
+
+POLYGON_AT_HEIGHT13000000
+POINT-12000000 -350000000
+POINT9000000 -350000000
+POINT9000000 -39000000
+POINT-12000000 -39000000
+
+POLYGON_AT_HEIGHT13000000
+POINT-12000000 -350000000
+POINT250000000 -350000000
+POINT250000000  -82000000
+POINT-12000000  -82000000
+
+
diff --git a/src/libseqarrange/src/CMakeLists.txt b/src/libseqarrange/src/CMakeLists.txt
new file mode 100644
index 0000000000..c533254064
--- /dev/null
+++ b/src/libseqarrange/src/CMakeLists.txt
@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(Surynek LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+set(CMAKE_CXX_EXTENSIONS False)
+
+add_library(libseqarrange STATIC seq_interface.cpp seq_preprocess.cpp seq_sequential.cpp seq_utilities.cpp)
+add_executable(sequential_arrange sequential_prusa.cpp)
+add_executable(sequential_decimator sequential_decimator.cpp)
+
+target_include_directories(libseqarrange PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../include)
+
+find_package(Z3 REQUIRED)
+slic3r_remap_configs("z3::libz3" RelWithDebInfo Release)
+
+target_link_libraries(libseqarrange libslic3r z3::libz3)
+target_link_libraries(sequential_arrange libseqarrange)
+target_link_libraries(sequential_decimator libseqarrange)
+
+
+
diff --git a/src/libseqarrange/src/seq_interface.cpp b/src/libseqarrange/src/seq_interface.cpp
new file mode 100644
index 0000000000..fee987926f
--- /dev/null
+++ b/src/libseqarrange/src/seq_interface.cpp
@@ -0,0 +1,1101 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_interface.cpp
+ *
+ * Interface of the sequential printing SMT model for Prusa Slic3r
+ */
+/*================================================================*/
+
+#include "seq_defs.hpp"
+
+#include "seq_sequential.hpp"
+#include "seq_preprocess.hpp"
+#include "seq_interface.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+
+
+
+/*----------------------------------------------------------------*/
+
+bool check_ScheduledObjectsForSequentialPrintability(const SolverConfiguration         &solver_configuration,
+						     const PrinterGeometry             &printer_geometry,
+						     const std::vector<ObjectToPrint>  &objects_to_print,
+						     const std::vector<ScheduledPlate> &scheduled_plates)
+{
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+
+    map<int, int> flat_index_map;
+    
+    for (int i = 0; i < objects_to_print.size(); ++i)
+    {
+	std::vector<Slic3r::Polygon> convex_level_polygons;	    
+	std::vector<Slic3r::Polygon> box_level_polygons;
+
+	std::vector<std::vector<Slic3r::Polygon> > extruder_convex_level_polygons;	    
+	std::vector<std::vector<Slic3r::Polygon> > extruder_box_level_polygons;	
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;		
+
+	flat_index_map[objects_to_print[i].id] = i;
+
+	Polygon scale_down_object_polygon;
+	    
+	prepare_ExtruderPolygons(solver_configuration,
+				 printer_geometry,
+				 objects_to_print[i],
+				 convex_level_polygons,
+				 box_level_polygons,
+				 extruder_convex_level_polygons,
+				 extruder_box_level_polygons);
+
+	prepare_ObjectPolygons(solver_configuration,
+			       convex_level_polygons,
+			       box_level_polygons,
+			       extruder_convex_level_polygons,
+			       extruder_box_level_polygons,
+			       scale_down_object_polygon,
+			       scale_down_unreachable_polygons);
+	
+	unreachable_polygons.push_back(scale_down_unreachable_polygons);
+	polygons.push_back(scale_down_object_polygon);	    	
+    }
+    
+    for (const auto& scheduled_plate: scheduled_plates)
+    {
+	int time = SEQ_GROUND_PRESENCE_TIME;
+	    
+	std::vector<Slic3r::Polygon> plate_polygons;
+	std::vector<std::vector<Slic3r::Polygon> > plate_unreachable_polygons;
+
+	std::vector<Rational> dec_values_X;
+	std::vector<Rational> dec_values_Y;
+	std::vector<Rational> dec_values_T;	
+	
+	for (const auto& scheduled_object: scheduled_plate.scheduled_objects)
+	{   
+	    const auto& flat_index = flat_index_map.find(scheduled_object.id)->second;
+
+	    plate_polygons.push_back(polygons[flat_index]);
+	    plate_unreachable_polygons.push_back(unreachable_polygons[flat_index]);
+
+	    dec_values_X.push_back(scaleDown_CoordinateForSequentialSolver(scheduled_object.x));
+	    dec_values_Y.push_back(scaleDown_CoordinateForSequentialSolver(scheduled_object.y));
+
+	    time += 2 * solver_configuration.temporal_spread * solver_configuration.object_group_size;	    
+	    dec_values_T.push_back(Rational(time));
+	}
+
+	#ifdef DEBUG
+	{
+	    printf("Point check ...\n");
+	}
+	#endif
+	if (!check_PointsOutsidePolygons(dec_values_X,
+					 dec_values_Y,
+					 dec_values_T,
+					 plate_polygons,
+					 plate_unreachable_polygons))
+	{
+	    return false;
+	}
+	#ifdef DEBUG
+	{
+	    printf("Point check ... finished\n");
+	}
+	#endif 
+
+	#ifdef DEBUG
+	{
+	    printf("Line check ...\n");
+	}
+	#endif 	
+	if (!check_PolygonLineIntersections(dec_values_X,
+					    dec_values_Y,
+					    dec_values_T,
+					    plate_polygons,
+					    plate_unreachable_polygons))
+	{
+	    return false;
+	}
+	#ifdef DEBUG
+	{
+	    printf("Line check ... finished\n");
+	}
+	#endif
+    }
+    #ifdef DEBUG
+    {
+	printf("Seems to be printable (you can try physically).\n");
+    }
+    #endif
+    
+    return true;
+}
+
+    
+/*----------------------------------------------------------------*/
+
+std::vector<ScheduledPlate> schedule_ObjectsForSequentialPrint(const SolverConfiguration        &solver_configuration,
+							       const PrinterGeometry            &printer_geometry,
+							       const std::vector<ObjectToPrint> &objects_to_print)
+{
+    std::vector<ScheduledPlate> scheduled_plates;
+
+    schedule_ObjectsForSequentialPrint(solver_configuration,
+				       printer_geometry,
+				       objects_to_print,
+				       scheduled_plates);
+    return scheduled_plates;
+}
+
+    
+void schedule_ObjectsForSequentialPrint(const SolverConfiguration        &solver_configuration,
+					const PrinterGeometry            &printer_geometry,
+					const std::vector<ObjectToPrint> &objects_to_print,
+					std::vector<ScheduledPlate>      &scheduled_plates)
+{
+    #ifdef PROFILE
+    clock_t start, finish;
+    start = clock();	
+    #endif
+
+    #ifdef DEBUG
+    {
+	printf("Sequential scheduling/arranging ...\n");
+    }
+    #endif
+
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+
+    map<int, int> original_index_map;    
+
+    #ifdef DEBUG
+    {
+	printf("  Preparing objects ...\n");
+    }
+    #endif
+    
+    for (int i = 0; i < objects_to_print.size(); ++i)
+    {
+	std::vector<Slic3r::Polygon> convex_level_polygons;	    
+	std::vector<Slic3r::Polygon> box_level_polygons;
+
+	std::vector<std::vector<Slic3r::Polygon> > extruder_convex_level_polygons;	    
+	std::vector<std::vector<Slic3r::Polygon> > extruder_box_level_polygons;	
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;		
+
+	original_index_map[i] = objects_to_print[i].id;
+
+	Polygon scale_down_object_polygon;
+	    
+	prepare_ExtruderPolygons(solver_configuration,
+				 printer_geometry,
+				 objects_to_print[i],
+				 convex_level_polygons,
+				 box_level_polygons,
+				 extruder_convex_level_polygons,
+				 extruder_box_level_polygons);
+
+	prepare_ObjectPolygons(solver_configuration,
+			       convex_level_polygons,
+			       box_level_polygons,
+			       extruder_convex_level_polygons,
+			       extruder_box_level_polygons,
+			       scale_down_object_polygon,
+			       scale_down_unreachable_polygons);
+	
+	unreachable_polygons.push_back(scale_down_unreachable_polygons);
+	polygons.push_back(scale_down_object_polygon);	    	
+    }
+
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;
+
+    #ifdef DEBUG
+    {
+	printf("  Preparing objects ... finished\n");
+    }
+    #endif
+
+    do
+    {
+	ScheduledPlate scheduled_plate;
+		
+	decided_polygons.clear();
+	remaining_polygons.clear();
+
+	#ifdef DEBUG
+	{
+	    printf("  Object scheduling/arranging ...\n");
+	}
+	#endif
+	
+	bool optimized;
+	
+	optimized = optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+										       poly_positions_X,
+										       poly_positions_Y,
+										       times_T,
+										       polygons,
+										       unreachable_polygons,
+										       polygon_index_map,
+										       decided_polygons,
+										       remaining_polygons);
+	
+	#ifdef DEBUG
+	{
+	    printf("  Object scheduling/arranging ... finished\n");
+	}
+	#endif
+	
+	if (optimized)
+	{
+	    #ifdef DEBUG
+	    {	    
+		printf("Polygon positions:\n");
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    printf("  [ID:%d,RID:%d] x:%.3f, y:%.3f (t:%.3f)\n",
+			   original_index_map[decided_polygons[i]],
+			   decided_polygons[i],
+			   poly_positions_X[decided_polygons[i]].as_double(),
+			   poly_positions_Y[decided_polygons[i]].as_double(),
+			   times_T[decided_polygons[i]].as_double());
+		}
+		printf("Remaining polygons: %ld\n", remaining_polygons.size());
+		for (int i = 0; i < remaining_polygons.size(); ++i)
+		{
+		    printf("  ID:%d\n", original_index_map[remaining_polygons[i]]);
+		}
+	    }
+	    #endif
+
+	    std::map<double, int> scheduled_polygons;
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		scheduled_polygons.insert(std::pair<double, int>(times_T[decided_polygons[i]].as_double(), decided_polygons[i]));
+	    }
+
+	    for (const auto& scheduled_polygon: scheduled_polygons)
+	    {
+		coord_t X, Y;
+		
+		scaleUp_PositionForSlicer(poly_positions_X[scheduled_polygon.second],
+					  poly_positions_Y[scheduled_polygon.second],
+					  X,
+					  Y);
+		const auto& original_index = original_index_map.find(scheduled_polygon.second);
+
+		scheduled_plate.scheduled_objects.push_back(ScheduledObject(original_index->second, X, Y));
+	    }	    
+	}
+	else
+	{
+	    #ifdef DEBUG
+	    {	    	    
+		printf("Polygon sequential schedule optimization FAILED.\n");
+	    }
+	    #endif
+
+	    throw std::runtime_error("COMPLETE SCHEDULING FAILURE (UNABLE TO SCHEDULE EVEN SINGLE OBJECT)");
+	}
+	#ifdef PROFILE
+	{
+	    finish = clock();
+	}
+	#endif
+	
+        #ifdef PROFILE
+	{	    
+	    printf("Intermediate CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+	}
+	#endif
+	
+	vector<Polygon> next_polygons;
+	vector<vector<Polygon> > next_unreachable_polygons;
+
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	vector<int> next_polygon_index_map;
+	map<int, int> next_original_index_map;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    next_polygon_index_map.push_back(index);
+	    next_original_index_map[index] = original_index_map[remaining_polygons[index]];
+	}
+	polygon_index_map = next_polygon_index_map;
+	original_index_map = next_original_index_map;
+
+	scheduled_plates.push_back(scheduled_plate);
+    }
+    while (!remaining_polygons.empty());    
+
+    #ifdef PROFILE
+    {
+	finish = clock();
+    }
+    #endif
+
+    #ifdef DEBUG
+    {	    
+	printf("Sequential scheduling/arranging ... finished\n");
+    }
+    #endif
+    
+    #ifdef PROFILE
+    {
+	printf("Total CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    }
+    #endif   
+}
+
+    
+/*----------------------------------------------------------------*/
+            
+int schedule_ObjectsForSequentialPrint(const SolverConfiguration        &solver_configuration,
+				       const std::vector<ObjectToPrint> &objects_to_print,
+				       std::vector<ScheduledPlate>      &scheduled_plates)
+{
+    #ifdef PROFILE
+    clock_t start, finish;
+    start = clock();	
+    #endif
+
+    #ifdef DEBUG
+    {
+	printf("Sequential scheduling/arranging ...\n");
+    }
+    #endif
+
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+
+    map<int, int> original_index_map;    
+
+    #ifdef DEBUG
+    {
+	printf("  Preparing objects ...\n");
+    }
+    #endif
+    
+    for (int i = 0; i < objects_to_print.size(); ++i)
+    {
+	Polygon nozzle_polygon;
+	Polygon extruder_polygon;
+	Polygon hose_polygon;
+	Polygon gantry_polygon;
+
+	original_index_map[i] = objects_to_print[i].id;
+	
+	for (int j = 0; j < objects_to_print[i].pgns_at_height.size(); ++j)
+	{
+	    coord_t height = objects_to_print[i].pgns_at_height[j].first;
+
+	    if (!objects_to_print[i].pgns_at_height[j].second.points.empty())
+	    {
+		Polygon decimated_polygon;
+
+		if (solver_configuration.decimation_precision != SEQ_DECIMATION_PRECISION_UNDEFINED)
+		{
+		    decimate_PolygonForSequentialSolver(solver_configuration,
+							objects_to_print[i].pgns_at_height[j].second,
+							decimated_polygon);
+		}
+		else
+		{
+		    decimated_polygon = objects_to_print[i].pgns_at_height[j].second;
+		    decimated_polygon.make_counter_clockwise();
+		}
+		if (!check_PolygonSize(solver_configuration, SEQ_SLICER_SCALE_FACTOR, decimated_polygon))
+		{
+		    #ifdef DEBUG
+		    {
+			printf("Object too large to fit onto plate [ID:%d RID:%d].\n", original_index_map[i], i);
+		    }
+		    #endif		    
+		    return -1;
+		}		
+
+		switch (solver_configuration.printer_type)
+		{
+		case SEQ_PRINTER_TYPE_PRUSA_MK3S:
+		{
+		    switch (height)
+		    {
+		    case SEQ_PRUSA_MK3S_NOZZLE_LEVEL:    // nozzle
+		    {
+			nozzle_polygon = decimated_polygon;		    
+			break;
+		    }
+		    case SEQ_PRUSA_MK3S_EXTRUDER_LEVEL:  // extruder
+		    {
+			extruder_polygon = decimated_polygon;		    		    
+			break;
+		    }
+		    case SEQ_PRUSA_MK3S_HOSE_LEVEL:      // hose
+		    {
+			hose_polygon = decimated_polygon;		    		    		    
+			break;
+		    }
+		    case SEQ_PRUSA_MK3S_GANTRY_LEVEL:    // gantry
+		    {
+			gantry_polygon = decimated_polygon;
+			break;
+		    }
+		    default:
+		    {
+			throw std::runtime_error("UNSUPPORTED POLYGON HEIGHT");		    
+			break;
+		    }
+		    }
+		    break;
+		}
+		case SEQ_PRINTER_TYPE_PRUSA_MK4:
+		{
+		    switch (height)
+		    {
+		    case SEQ_PRUSA_MK4_NOZZLE_LEVEL:    // nozzle
+		    {
+			nozzle_polygon = decimated_polygon;		    
+			break;
+		    }
+		    case SEQ_PRUSA_MK4_EXTRUDER_LEVEL:  // extruder
+		    {
+			extruder_polygon = decimated_polygon;		    		    
+			break;
+		    }
+		    case SEQ_PRUSA_MK4_HOSE_LEVEL:      // hose
+		    {
+			hose_polygon = decimated_polygon;		    		    		    
+			break;
+		    }
+		    case SEQ_PRUSA_MK4_GANTRY_LEVEL:    // gantry
+		    {
+			gantry_polygon = decimated_polygon;
+			break;
+		    }
+		    default:
+		    {
+			throw std::runtime_error("UNSUPPORTED POLYGON HEIGHT");		    
+			break;
+		    }
+		    }
+		    break;
+		}	       
+		case SEQ_PRINTER_TYPE_PRUSA_XL:
+		{
+		    switch (height)
+		    {
+		    case SEQ_PRUSA_XL_NOZZLE_LEVEL:    // nozzle
+		    {
+			nozzle_polygon = decimated_polygon;		    
+			break;
+		    }
+		    case SEQ_PRUSA_XL_EXTRUDER_LEVEL:  // extruder
+		    {
+			extruder_polygon = decimated_polygon;		    		    
+			break;
+		    }
+		    case SEQ_PRUSA_XL_HOSE_LEVEL:      // hose (no hose in XL)
+		    {
+			hose_polygon = decimated_polygon;		    		    		    
+			break;
+		    }
+		    case SEQ_PRUSA_XL_GANTRY_LEVEL:    // gantry
+		    {
+			gantry_polygon = decimated_polygon;
+			break;
+		    }
+		    default:
+		    {
+			throw std::runtime_error("UNSUPPORTED POLYGON HEIGHT");		    
+			break;
+		    }
+		    }
+		    break;
+		}	      
+		default:
+		{
+		    throw std::runtime_error("UNSUPPORTED PRINTER TYPE");		    
+		    break;		    
+		}
+		}
+	    }
+	}
+
+	Polygon scale_down_polygon;
+	scaleDown_PolygonForSequentialSolver(nozzle_polygon, scale_down_polygon);
+	polygons.push_back(scale_down_polygon);
+
+	std::vector<Slic3r::Polygon> convex_level_polygons;
+	convex_level_polygons.push_back(nozzle_polygon);
+	convex_level_polygons.push_back(extruder_polygon);	
+	std::vector<Slic3r::Polygon> box_level_polygons;
+	box_level_polygons.push_back(hose_polygon);
+	box_level_polygons.push_back(gantry_polygon);		
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;
+
+	switch (solver_configuration.printer_type)
+	{
+	case SEQ_PRINTER_TYPE_PRUSA_MK3S:
+	{
+	    prepare_UnreachableZonePolygons(solver_configuration,
+					   convex_level_polygons,
+					   box_level_polygons,
+					   SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK3S,
+					   SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK3S,
+					   scale_down_unreachable_polygons);	    
+	    break;
+	}
+	case SEQ_PRINTER_TYPE_PRUSA_MK4:
+	{
+	    prepare_UnreachableZonePolygons(solver_configuration,
+					   convex_level_polygons,
+					   box_level_polygons,
+					   SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK4,
+					   SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK4,
+					   scale_down_unreachable_polygons);	    
+	    break;
+	}
+	case SEQ_PRINTER_TYPE_PRUSA_XL:
+	{
+	    prepare_UnreachableZonePolygons(solver_configuration,
+					   convex_level_polygons,
+					   box_level_polygons,
+					   SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_XL,
+					   SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_XL,
+					   scale_down_unreachable_polygons);	    
+	    break;
+	}
+	default:
+	{
+	    throw std::runtime_error("UNSUPPORTED PRINTER TYPE");		    
+	    break;
+	}	
+	}
+	
+	unreachable_polygons.push_back(scale_down_unreachable_polygons);
+    }
+
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;
+
+    #ifdef DEBUG
+    {
+	printf("  Preparing objects ... finished\n");
+    }
+    #endif
+
+    do
+    {
+	ScheduledPlate scheduled_plate;
+		
+	decided_polygons.clear();
+	remaining_polygons.clear();
+
+	#ifdef DEBUG
+	{
+	    printf("  Object scheduling/arranging ...\n");
+	}
+	#endif
+	
+	bool optimized;
+	
+	optimized = optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+										       poly_positions_X,
+										       poly_positions_Y,
+										       times_T,
+										       polygons,
+										       unreachable_polygons,
+										       polygon_index_map,
+										       decided_polygons,
+										       remaining_polygons);
+	
+	#ifdef DEBUG
+	{
+	    printf("  Object scheduling/arranging ... finished\n");
+	}
+	#endif
+	
+	if (optimized)
+	{
+	    #ifdef DEBUG
+	    {	    
+		printf("Polygon positions:\n");
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    printf("  [ID:%d,RID:%d] x:%.3f, y:%.3f (t:%.3f)\n",
+			   original_index_map[decided_polygons[i]],
+			   decided_polygons[i],
+			   poly_positions_X[decided_polygons[i]].as_double(),
+			   poly_positions_Y[decided_polygons[i]].as_double(),
+			   times_T[decided_polygons[i]].as_double());
+		}
+		printf("Remaining polygons: %ld\n", remaining_polygons.size());
+		for (int i = 0; i < remaining_polygons.size(); ++i)
+		{
+		    printf("  ID:%d\n", original_index_map[remaining_polygons[i]]);
+		}
+	    }
+	    #endif
+
+	    std::map<double, int> scheduled_polygons;
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		scheduled_polygons.insert(std::pair<double, int>(times_T[decided_polygons[i]].as_double(), decided_polygons[i]));
+	    }
+
+	    for (const auto& scheduled_polygon: scheduled_polygons)
+	    {
+		coord_t X, Y;
+		
+		scaleUp_PositionForSlicer(poly_positions_X[scheduled_polygon.second],
+					  poly_positions_Y[scheduled_polygon.second],
+					  X,
+					  Y);
+		const auto& original_index = original_index_map.find(scheduled_polygon.second);
+
+		scheduled_plate.scheduled_objects.push_back(ScheduledObject(original_index->second, X, Y));
+	    }	    
+	}
+	else
+	{
+	    #ifdef DEBUG
+	    {	    	    
+		printf("Polygon sequential schedule optimization FAILED.\n");
+	    }
+	    #endif
+	    return -2;
+	}
+	#ifdef PROFILE
+	{
+	    finish = clock();
+	}
+	#endif
+	
+        #ifdef PROFILE
+	{	    
+	    printf("Intermediate CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+	}
+	#endif
+	
+	vector<Polygon> next_polygons;
+	vector<vector<Polygon> > next_unreachable_polygons;
+
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	vector<int> next_polygon_index_map;
+	map<int, int> next_original_index_map;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    next_polygon_index_map.push_back(index);
+	    next_original_index_map[index] = original_index_map[remaining_polygons[index]];
+	}
+	polygon_index_map = next_polygon_index_map;
+	original_index_map = next_original_index_map;
+
+	scheduled_plates.push_back(scheduled_plate);
+    }
+    while (!remaining_polygons.empty());    
+
+    #ifdef PROFILE
+    {
+	finish = clock();
+    }
+    #endif
+
+    #ifdef DEBUG
+    {	    
+	printf("Sequential scheduling/arranging ... finished\n");
+    }
+    #endif
+    
+    #ifdef PROFILE
+    {
+	printf("Total CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    }
+    #endif
+    
+    return 0;
+}
+
+
+void setup_ExtruderUnreachableZones(const SolverConfiguration                  &solver_configuration,
+				   std::vector<std::vector<Slic3r::Polygon> > &convex_unreachable_zones,
+				   std::vector<std::vector<Slic3r::Polygon> > &box_unreachable_zones)
+{
+    switch (solver_configuration.printer_type)
+    {
+    case SEQ_PRINTER_TYPE_PRUSA_MK3S:
+    {
+	convex_unreachable_zones =  SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK3S;
+	box_unreachable_zones =  SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK3S;	
+	break;
+    }
+    case SEQ_PRINTER_TYPE_PRUSA_MK4:
+    {
+	convex_unreachable_zones =  SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK4;
+	box_unreachable_zones =  SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK4;		
+	break;
+    }
+    case SEQ_PRINTER_TYPE_PRUSA_XL:
+    {
+	convex_unreachable_zones =  SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_XL;
+	box_unreachable_zones =  SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_XL;			
+	break;
+    }        
+    default:
+    {
+	throw std::runtime_error("UNSUPPORTED PRINTER TYPE");		    
+	break;		    
+    }
+    }
+}
+
+
+int schedule_ObjectsForSequentialPrint(const SolverConfiguration                        &solver_configuration,
+				       const std::vector<ObjectToPrint>                 &objects_to_print,
+				       const std::vector<std::vector<Slic3r::Polygon> > &convex_unreachable_zones,
+				       const std::vector<std::vector<Slic3r::Polygon> > &box_unreachable_zones,
+				       std::vector<ScheduledPlate>                      &scheduled_plates)
+{
+    #ifdef PROFILE
+    clock_t start, finish;
+    start = clock();	
+    #endif
+
+    #ifdef DEBUG
+    {
+	printf("Sequential scheduling/arranging ...\n");
+    }
+    #endif
+
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+
+    map<int, int> original_index_map;    
+
+    #ifdef DEBUG
+    {
+	printf("  Preparing objects ...\n");
+    }
+    #endif
+    
+    for (int i = 0; i < objects_to_print.size(); ++i)
+    {
+	Polygon nozzle_polygon;
+	Polygon extruder_polygon;
+	Polygon hose_polygon;
+	Polygon gantry_polygon;
+
+	original_index_map[i] = objects_to_print[i].id;
+
+	int ht = 0;
+	
+	for (int j = 0; j < objects_to_print[i].pgns_at_height.size(); ++j)
+	{
+	    if (!objects_to_print[i].pgns_at_height[j].second.points.empty())
+	    {
+		Polygon decimated_polygon;
+
+		if (solver_configuration.decimation_precision != SEQ_DECIMATION_PRECISION_UNDEFINED)
+		{
+		    decimate_PolygonForSequentialSolver(solver_configuration,
+							objects_to_print[i].pgns_at_height[j].second,
+							decimated_polygon);
+		}
+		else
+		{
+		    decimated_polygon = objects_to_print[i].pgns_at_height[j].second;
+		    decimated_polygon.make_counter_clockwise();
+		}
+		
+		if (!check_PolygonSize(solver_configuration, SEQ_SLICER_SCALE_FACTOR, decimated_polygon))
+		{
+		    #ifdef DEBUG
+		    {
+			printf("Object too large to fit onto plate [ID:%d RID:%d].\n", original_index_map[i], i);
+		    }
+		    #endif
+		    return -1;
+		}		
+		
+		switch (ht)
+		{
+		case 0:    // nozzle
+		{
+		    nozzle_polygon = decimated_polygon;		    
+		    break;
+		}
+		case 1:    // extruder
+		{
+		    extruder_polygon = decimated_polygon;		    		    
+		    break;
+		}
+		case 2:    // hose
+		{
+		    hose_polygon = decimated_polygon;		    		    		    
+		    break;
+		}
+		case 3:    // gantry
+		{
+		    gantry_polygon = decimated_polygon;
+		    break;
+		}
+		default:
+		{
+		    throw std::runtime_error("UNSUPPORTED POLYGON HEIGHT");		    
+		    break;
+		}
+		}
+	    }
+	    ++ht;
+	}
+
+	Polygon scale_down_polygon;
+	scaleDown_PolygonForSequentialSolver(nozzle_polygon, scale_down_polygon);
+	polygons.push_back(scale_down_polygon);
+
+	std::vector<Slic3r::Polygon> convex_level_polygons;
+	convex_level_polygons.push_back(nozzle_polygon);	
+	convex_level_polygons.push_back(extruder_polygon);
+	
+	std::vector<Slic3r::Polygon> box_level_polygons;
+	box_level_polygons.push_back(hose_polygon);
+	box_level_polygons.push_back(gantry_polygon);		
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;
+
+	prepare_UnreachableZonePolygons(solver_configuration,
+				       convex_level_polygons,
+				       box_level_polygons,
+				       convex_unreachable_zones,
+				       box_unreachable_zones,
+				       scale_down_unreachable_polygons);
+	
+	unreachable_polygons.push_back(scale_down_unreachable_polygons);
+    }
+
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;
+
+    #ifdef DEBUG
+    {
+	printf("  Preparing objects ... finished\n");
+    }
+    #endif
+
+    do
+    {
+	ScheduledPlate scheduled_plate;
+		
+	decided_polygons.clear();
+	remaining_polygons.clear();
+
+	#ifdef DEBUG
+	{
+	    printf("  Object scheduling/arranging ...\n");
+	}
+	#endif
+	
+	bool optimized;
+	
+	optimized = optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+										       poly_positions_X,
+										       poly_positions_Y,
+										       times_T,
+										       polygons,
+										       unreachable_polygons,
+										       polygon_index_map,
+										       decided_polygons,
+										       remaining_polygons);
+	
+	#ifdef DEBUG
+	{
+	    printf("  Object scheduling/arranging ... finished\n");
+	}
+	#endif
+	
+	if (optimized)
+	{
+	    #ifdef DEBUG
+	    {	    
+		printf("Polygon positions:\n");
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    printf("  [ID:%d,RID:%d] x:%.3f, y:%.3f (t:%.3f)\n",
+			   original_index_map[decided_polygons[i]],
+			   decided_polygons[i],
+			   poly_positions_X[decided_polygons[i]].as_double(),
+			   poly_positions_Y[decided_polygons[i]].as_double(),
+			   times_T[decided_polygons[i]].as_double());
+		}
+		printf("Remaining polygons: %ld\n", remaining_polygons.size());
+		for (int i = 0; i < remaining_polygons.size(); ++i)
+		{
+		    printf("  ID:%d\n", original_index_map[remaining_polygons[i]]);
+		}
+	    }
+	    #endif
+
+	    std::map<double, int> scheduled_polygons;
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		scheduled_polygons.insert(std::pair<double, int>(times_T[decided_polygons[i]].as_double(), decided_polygons[i]));
+	    }
+
+	    for (const auto& scheduled_polygon: scheduled_polygons)
+	    {
+		coord_t X, Y;
+		
+		scaleUp_PositionForSlicer(poly_positions_X[scheduled_polygon.second],
+					  poly_positions_Y[scheduled_polygon.second],
+					  X,
+					  Y);
+		const auto& original_index = original_index_map.find(scheduled_polygon.second);
+
+		scheduled_plate.scheduled_objects.push_back(ScheduledObject(original_index->second, X, Y));
+	    }	    
+	}
+	else
+	{
+	    #ifdef DEBUG
+	    {	    	    
+		printf("Polygon sequential schedule optimization FAILED.\n");
+	    }
+	    #endif
+	    return -2;
+	}
+	#ifdef PROFILE
+	{
+	    finish = clock();
+	}
+	#endif
+	
+        #ifdef PROFILE
+	{	    
+	    printf("Intermediate CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+	}
+	#endif
+	
+	vector<Polygon> next_polygons;
+	vector<vector<Polygon> > next_unreachable_polygons;
+
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	vector<int> next_polygon_index_map;
+	map<int, int> next_original_index_map;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    next_polygon_index_map.push_back(index);
+	    next_original_index_map[index] = original_index_map[remaining_polygons[index]];
+	}
+	polygon_index_map = next_polygon_index_map;
+	original_index_map = next_original_index_map;
+
+	scheduled_plates.push_back(scheduled_plate);
+    }
+    while (!remaining_polygons.empty());    
+
+    #ifdef PROFILE
+    {
+	finish = clock();
+    }
+    #endif
+
+    #ifdef DEBUG
+    {	    
+	printf("Sequential scheduling/arranging ... finished\n");
+    }
+    #endif
+    
+    #ifdef PROFILE
+    {
+	printf("Total CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    }
+    #endif
+    
+    return 0;    
+}
+
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
diff --git a/src/libseqarrange/src/seq_preprocess.cpp b/src/libseqarrange/src/seq_preprocess.cpp
new file mode 100644
index 0000000000..2125e61d94
--- /dev/null
+++ b/src/libseqarrange/src/seq_preprocess.cpp
@@ -0,0 +1,965 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_preprocess.hpp
+ *
+ * Object preprocessing for the sequential printing SMT model.
+ */
+/*================================================================*/
+
+#include "seq_defs.hpp"
+
+#include "libslic3r/Geometry.hpp"
+#include "libslic3r/ClipperUtils.hpp"
+
+#include "seq_preprocess.hpp"
+#include "seq_interface.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+using namespace std;
+using namespace Slic3r;
+//using namespace ClipperLib;
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+
+        
+
+/*----------------------------------------------------------------*/
+
+// These are only approximate values for M3S, TODO: measure MK3S for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S =
+{
+    {
+        {-500000, -500000},
+        {500000, -500000},
+        {500000, 500000},
+        {-500000, 500000}
+    }
+};
+
+
+// TODO: measure MK3S for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S =
+{
+    {
+        {-2000000, -10000000},
+        {2000000, -10000000},
+        {2000000, 2000000},
+        {-2000000, 2000000}
+    }	
+};
+
+
+// TODO: measure MK3S for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S =
+{
+    {
+        {-1000000, 500000},
+        {1000000, 500000},
+        {1000000, -250000000},
+        {-1000000, -250000000}	
+    }
+};
+
+
+// TODO: measure MK3S for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S =
+{
+    {
+        {-250000000, 2000000},
+        {250000000, 2000000},	
+        {250000000, 2100000},
+        {-250000000, 2100000}
+    }
+};
+
+    
+// TODO: measure MK3S for true values
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_ALL_LEVELS_MK3S =
+{
+    SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S,
+    SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S,
+    SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S,
+    SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S    
+};
+
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK3S =
+{
+    SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S,
+    SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S
+};
+
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK3S =
+{
+    SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S,
+    SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S    
+};
+
+
+/*----------------------------------------------------------------*/
+
+// Nozzle height range: 0.00mm-4.9mm
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK4 =
+{
+    {
+	/* hand tailored */
+	{ -5000000,  -5000000},
+	{ 5000000,  -5000000},
+	{ 5000000,  5000000},
+	{ -5000000,  5000000}
+	
+	/* original from decimator
+	{ -3 728 158,  -1 611 789},
+	{ -468 223,  -4 034 578},
+	{ 2 543 938,  -2 732 339},
+	{ 3 259 933,  -2 422 789},
+	{ 3 728 160,  1 611 785},
+	{ 468 227,  4 034 579},
+	{ -1 666 062,  3 111 867},
+	{ -3 259 931,  2 422 789},
+	*/
+    }
+};
+
+// Extruder height range: 4.9mm-13.0mm
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK4 =
+{
+    {   /* fan - hand tailored */
+	{ -1000000, -21000000},	
+	{ 37000000, -21000000},
+	{ 37000000,  44000000},
+	{ -1000000,  44000000}
+
+	/* fan - original from decimator
+	{  87952801,    3665480},	
+	{ 103166346,   -1375028},	
+	{ 105384145,   -1136906},	
+	{ 107137556,     241781},	
+	{ 107889619,    2905295},		
+	{ 102396166,   55454515},	
+	{ 101386126,   58737097},	
+	{  93053422,   62777197},	
+	{  87447788,   59999636},	
+	{  70782970,   28440457},	
+
+	// nozzle
+	{ -29076068,  18872356},	
+	{ -29001876,  18872356},	
+	{ -29001876,  18952646},	
+	{ -29076068,  18952646},	
+
+ */
+    },
+    {   /* body - hand tailored */
+	{-40000000, -45000000},
+	{ 38000000, -45000000},
+	{ 38000000,  20000000},
+	{-40000000,  20000000}
+	
+        /* body - original from decimator
+	{ -68105202,  -14269412},	
+	{ -62019977,  -20740757},	
+	{ -37145411,  -25968391},	
+	{ -23949432,  -25968391},	
+	{    919905,  -20740757},	
+	{   3102334,  -16781961},	
+	{   8275483,    3033496},	
+	{   -130845,   26409612},	
+	{ -20142759,   38793397},	
+	{ -62268386,   38793397},	
+	{ -67090122,   17070789},	
+
+	// nozzle
+	{ -29076068,  18872356},	
+	{ -29001876,  18872356},	
+	{ -29001876,  18952646},	
+	{ -29076068,  18952646},	
+	*/
+    }
+};
+
+
+// Gantry height range: 13.0mm-15.0mm
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK4 =
+{
+    {
+	/* hand tailored */
+	{ -350000000, -4000000},
+        { 350000000, -4000000},
+        { 350000000, -14000000},
+        { -350000000, -14000000}
+
+	/* original from decimator
+        { -206972968,  -12664471},
+        { -206470468,  -13167301}
+        { 164374531,  -13167301},
+        { 164877031,  -12664471},
+        { 164877031,  -5630724},
+        { 164374531,  -5128674},
+        { -206470468,  -5128674},
+        { -206972968,  -5630724},
+
+	nozzle
+        { -29111351,  18877954},
+        { -29022835,  18841825},
+        { -28966594,  18940523},
+        { -29040014,  18983178},
+        */
+    }
+};
+
+    
+// Hose height range: 15.0mm-infinity (the hose is the last)
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK4 =
+{
+    {
+	/* rigid hose - hand tailored */
+	{ -12000000, -350000000},
+	{   9000000, -350000000},
+	{   9000000,  -39000000},
+	{ -12000000,  -39000000}
+	
+	/* original from decimator
+	{ -40942228,  -22802359},
+        { -38008017,  -64681679},
+        { -23603700,  -65215173},
+        { -20135995,  -20401563},
+        { -28933517,  21680323},
+
+	// nozzle
+        { -29111351,  18877954},
+        { -29022835,  18841825},
+        { -28966594,  18940523},
+        { -29040014,  18983178},
+	*/
+    },
+    {
+	/* flexible hose - hand tailored */
+	{ -12000000, -350000000},
+	{ 250000000, -350000000},
+	{ 250000000,  -82000000},
+	{ -12000000,  -82000000}
+    }
+};
+    
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_ALL_LEVELS_MK4 =
+{
+    SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK4,
+    SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK4,
+    SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK4,
+    SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK4    
+};
+
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK4 =
+{
+    SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK4,
+    SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK4
+};
+
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK4 =
+{
+    SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK4,
+    SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK4    
+};
+    
+
+/*----------------------------------------------------------------*/
+
+// TODO: Measure XL for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_XL =
+{
+    {
+        {-500000, -500000},
+        {500000, -500000},
+        {500000, 500000},
+        {-500000, 500000}
+    }
+};
+
+
+// TODO: Measure XL for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_XL =
+{
+    {
+        {-2000000, -10000000},
+        {2000000, -10000000},
+        {2000000, 2000000},
+        {-2000000, 2000000}
+    }	
+};
+
+
+// TODO: Measure XL for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_XL =
+{
+    {
+        {-1000000, 500000},
+        {1000000, 500000},
+        {1000000, -250000000},
+        {-1000000, -250000000}	
+    }
+};
+
+
+// TODO: Measure XL for true values
+const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_XL =
+{
+    {
+        {-250000000, 2000000},
+        {250000000, 2000000},	
+        {250000000, 2100000},
+        {-250000000, 2100000}
+    }
+};
+
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_ALL_LEVELS_XL =
+{
+    SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_XL,
+    SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_XL,
+    SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_XL,
+    SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_XL    
+};
+
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_XL =
+{
+    SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_XL,
+    SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_XL
+};
+
+
+const std::vector<std::vector<Slic3r::Polygon> > SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_XL =
+{
+    SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_XL,
+    SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_XL    
+};
+    
+    
+/*----------------------------------------------------------------*/
+
+Rational scaleDown_CoordinateForSequentialSolver(coord_t x)
+{
+    Rational scale_down_x(x, SEQ_SLICER_SCALE_FACTOR);
+    scale_down_x.normalize();
+
+    return scale_down_x;
+}
+
+
+void scaleDown_PolygonForSequentialSolver(const Slic3r::Polygon &polygon,
+					  Slic3r::Polygon       &scale_down_polygon)
+{
+    scaleDown_PolygonForSequentialSolver(SEQ_SLICER_SCALE_FACTOR, polygon, scale_down_polygon);
+}
+
+
+void scaleDown_PolygonForSequentialSolver(coord_t                scale_factor,
+					  const Slic3r::Polygon &polygon,
+					  Slic3r::Polygon       &scale_down_polygon)
+{
+    for (int i = 0; i < polygon.points.size(); ++i)
+    {
+	scale_down_polygon.points.insert(scale_down_polygon.points.begin() + i, Point(polygon.points[i].x() / scale_factor, polygon.points[i].y() / scale_factor));
+    }
+    scale_down_polygon.make_counter_clockwise();    
+}
+
+
+Slic3r::Polygon scaleDown_PolygonForSequentialSolver(coord_t scale_factor, const Slic3r::Polygon &polygon)
+{
+    Slic3r::Polygon scale_down_polygon;
+	
+    for (int i = 0; i < polygon.points.size(); ++i)
+    {
+	scale_down_polygon.points.insert(scale_down_polygon.points.begin() + i, Point(polygon.points[i].x() / scale_factor, polygon.points[i].y() / scale_factor));
+    }
+    scale_down_polygon.make_counter_clockwise();
+
+    return scale_down_polygon;
+}
+
+
+void scaleUp_PositionForSlicer(const Rational &position_X,
+			       const Rational &position_Y,			       
+			       coord_t        &scaled_position_X,
+			       coord_t        &scaled_position_Y)
+{
+    scaleUp_PositionForSlicer(SEQ_SLICER_SCALE_FACTOR, position_X, position_Y, scaled_position_X, scaled_position_Y);
+}
+
+
+void scaleUp_PositionForSlicer(coord_t        scale_factor,
+			       const Rational &position_X,
+			       const Rational &position_Y,			       
+			       coord_t        &scaled_position_X,
+			       coord_t        &scaled_position_Y)
+{
+    scaled_position_X = (position_X.normalize() * scale_factor).as_int64();
+    scaled_position_Y = (position_Y.normalize() * scale_factor).as_int64();
+}
+
+
+
+void scaleUp_PositionForSlicer(double position_X, double position_Y, coord_t &scaled_position_X, coord_t &scaled_position_Y)
+{
+    scaleUp_PositionForSlicer(SEQ_SLICER_SCALE_FACTOR, position_X, position_Y, scaled_position_X, scaled_position_Y);
+}
+
+
+void scaleUp_PositionForSlicer(coord_t  scale_factor,
+			       double   position_X,
+			       double   position_Y,
+			       coord_t &scaled_position_X,
+			       coord_t &scaled_position_Y)
+{
+    scaled_position_X = scale_factor * position_X;
+    scaled_position_Y = scale_factor * position_Y;    
+}
+
+
+Slic3r::Polygon scaleUp_PolygonForSlicer(const Slic3r::Polygon &polygon)
+{
+    return scaleUp_PolygonForSlicer(SEQ_SLICER_SCALE_FACTOR, polygon);
+}
+
+
+Slic3r::Polygon scaleUp_PolygonForSlicer(coord_t scale_factor, const Slic3r::Polygon &polygon)
+{
+    Slic3r::Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {
+	poly.points[i] = Slic3r::Point(poly.points[i].x() * scale_factor, poly.points[i].y() * scale_factor);
+    }
+
+    return poly;
+}
+
+
+Slic3r::Polygon scaleUp_PolygonForSlicer(const Polygon &polygon, double x_pos, double y_pos)
+{
+    return scaleUp_PolygonForSlicer(SEQ_SLICER_SCALE_FACTOR, polygon, x_pos, y_pos);
+}
+
+
+Slic3r::Polygon scaleUp_PolygonForSlicer(coord_t scale_factor, const Polygon &polygon, double x_pos, double y_pos)
+{
+    Slic3r::Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {	
+	poly.points[i] = Point(poly.points[i].x() * scale_factor + x_pos * scale_factor,
+			       poly.points[i].y() * scale_factor + y_pos * scale_factor);
+    }
+
+    return poly;
+}
+
+
+void ground_PolygonByBoundingBox(Slic3r::Polygon &polygon)
+{    
+    BoundingBox polygon_box = get_extents(polygon);
+
+    for (int i = 0; i < polygon.points.size(); ++i)
+    {
+	polygon.points[i] -= polygon_box.min;
+    }    
+}
+
+
+void ground_PolygonByFirstPoint(Slic3r::Polygon &polygon)
+{
+    Point first = polygon.points[0];
+    for (int i = 0; i < polygon.points.size(); ++i)
+    {
+	polygon.points[i] -= first;
+    }    
+}
+
+
+void shift_Polygon(Slic3r::Polygon &polygon, coord_t x_offset, coord_t y_offset)
+{
+    Point offset(x_offset, y_offset);
+    
+    shift_Polygon(polygon, offset);
+}
+
+
+void shift_Polygon(Slic3r::Polygon &polygon, const Slic3r::Point &offset)
+{
+    for (int i = 0; i < polygon.points.size(); ++i)
+    {
+	polygon.points[i] += offset;
+    }           
+}
+
+
+/*----------------------------------------------------------------*/
+
+Polygon transform_UpsideDown(const SolverConfiguration &solver_configuration, const Polygon &polygon)
+{
+    return transform_UpsideDown(solver_configuration, SEQ_SLICER_SCALE_FACTOR, polygon);
+}
+
+
+Polygon transform_UpsideDown(const SolverConfiguration &solver_configuration, coord_t scale_factor, const Polygon &polygon)
+{
+    Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {	
+	poly.points[i] = Point(poly.points[i].x(),
+			       (coord_t)(solver_configuration.maximum_Y_bounding_box_size * scale_factor - poly.points[i].y()));
+    }
+
+    return poly;    
+}
+
+
+void transform_UpsideDown(const SolverConfiguration &solver_configuration, const coord_t &scaled_x_pos, const coord_t &scaled_y_pos, coord_t &transformed_x_pos, coord_t &transformed_y_pos)
+{
+    transform_UpsideDown(solver_configuration, SEQ_SLICER_SCALE_FACTOR, scaled_x_pos, scaled_y_pos, transformed_x_pos, transformed_y_pos);
+}
+
+
+void transform_UpsideDown(const SolverConfiguration &solver_configuration, coord_t scale_factor, const coord_t &scaled_x_pos, const coord_t &scaled_y_pos, coord_t &transformed_x_pos, coord_t &transformed_y_pos)
+{
+    transformed_x_pos = scaled_x_pos;
+    transformed_y_pos = solver_configuration.maximum_Y_bounding_box_size * scale_factor - scaled_y_pos;
+}
+
+
+/*----------------------------------------------------------------*/
+
+void decimate_PolygonForSequentialSolver(const SolverConfiguration &solver_configuration,
+					 const Slic3r::Polygon     &polygon,
+					 Slic3r::Polygon           &decimated_polygon)
+{
+    double DP_tolerance = SolverConfiguration::convert_DecimationPrecision2Tolerance(solver_configuration.decimation_precision);
+
+    decimate_PolygonForSequentialSolver(DP_tolerance, polygon, decimated_polygon);
+}
+
+
+void decimate_PolygonForSequentialSolver(double                     DP_tolerance,
+					 const Slic3r::Polygon     &polygon,
+					 Slic3r::Polygon           &decimated_polygon)
+{
+    decimated_polygon = polygon;
+    decimated_polygon.make_counter_clockwise();
+
+    decimated_polygon.douglas_peucker(DP_tolerance);
+    
+    if (decimated_polygon.points.size() >= 4)
+    {
+	while (true)
+	{
+	    for (int i = 0; i < decimated_polygon.points.size(); ++i)
+	    {
+		decimated_polygon.points[i] *= SEQ_POLYGON_DECIMATION_GROW_FACTOR;
+	    }
+	    
+	    BoundingBox polygon_box = get_extents(polygon);
+	    BoundingBox decimated_polygon_box = get_extents(decimated_polygon);
+	    
+	    coord_t shift_x = ((decimated_polygon_box.min.x() + decimated_polygon_box.max.x()) / 2) - ((polygon_box.min.x() + polygon_box.max.x()) / 2);
+	    coord_t shift_y = ((decimated_polygon_box.min.y() + decimated_polygon_box.max.y()) / 2) - ((polygon_box.min.y() + polygon_box.max.y()) / 2);
+	    
+	    for (int i = 0; i < decimated_polygon.points.size(); ++i)
+	    {
+		decimated_polygon.points[i] -= Point(shift_x, shift_y);
+	    }
+	    	    
+	    bool contains = true;
+	    for (int i = 0; i < polygon.points.size(); ++i)
+	    {
+		if (!decimated_polygon.contains(polygon.points[i]))
+		{
+		    contains = false;
+		    break;
+		}
+	    }
+	    
+	    if (contains)
+	    {
+		break;
+	    }
+	}
+    }
+    else
+    {
+	BoundingBox polygon_box = get_extents(polygon);
+	
+	decimated_polygon = { { polygon_box.min.x(), polygon_box.min.y() },
+			      { polygon_box.max.x(), polygon_box.min.y() },
+			      { polygon_box.max.x(), polygon_box.max.y() },
+			      { polygon_box.min.x(), polygon_box.max.y() } };
+    }
+    
+    #ifdef DEBUG
+    {
+	printf("Comparison: %ld, %ld\n", polygon.points.size(), decimated_polygon.points.size());
+    }
+    #endif
+}
+
+
+void extend_PolygonConvexUnreachableZone(const SolverConfiguration          &SEQ_UNUSED(solver_configuration),
+					 const Slic3r::Polygon              &polygon,
+					 const std::vector<Slic3r::Polygon> &extruder_polygons,
+					 std::vector<Slic3r::Polygon>       &unreachable_polygons)
+{
+    if (!polygon.points.empty())
+    {
+	Slic3r::ClipperLib::Paths paths;
+	
+	for (int i = 0; i < extruder_polygons.size(); ++i)
+	{
+	    ClipperLib::MinkowskiSum(extruder_polygons[i].points, polygon.points, paths, true);
+	    
+	    for (int j = 0; j < paths.size(); ++j)
+	    {
+		unreachable_polygons.push_back(Polygon(paths[j]));
+	    }
+	}
+    }
+}
+
+
+void extend_PolygonBoxUnreachableZone(const SolverConfiguration          &SEQ_UNUSED(solver_configuration),
+				      const Slic3r::Polygon              &polygon,
+				      const std::vector<Slic3r::Polygon> &extruder_polygons,
+				      std::vector<Slic3r::Polygon>       &unreachable_polygons)
+{
+    if (!polygon.points.empty())
+    {
+	BoundingBox polygon_box = get_extents(polygon);
+    
+	for (int i = 0; i < extruder_polygons.size(); ++i)
+	{
+	    BoundingBox extruder_box = get_extents(extruder_polygons[i]);
+	
+	/*
+	coord_t extruder_box_size_x = extruder_box.max.x() - extruder_box.min.x();
+	coord_t extruder_box_size_y = extruder_box.max.y() - extruder_box.min.y();	
+	*/
+
+	    coord_t min_x = polygon_box.min.x() + extruder_box.min.x();
+	    coord_t min_y = polygon_box.min.y() + extruder_box.min.y();
+	    
+	    coord_t max_x = polygon_box.max.x() + extruder_box.max.x();
+	    coord_t max_y = polygon_box.max.y() + extruder_box.max.y();
+	    
+	    unreachable_polygons.push_back(Polygon({ { min_x, min_y },
+						    { max_x, min_y },
+						    { max_x, max_y },
+						    { min_x, max_y } }));
+	}
+    }
+}
+
+
+void prepare_ExtruderPolygons(const SolverConfiguration                  &solver_configuration,
+			      const PrinterGeometry                      &printer_geometry,
+			      const ObjectToPrint                        &object_to_print,
+			      std::vector<Slic3r::Polygon>               &convex_level_polygons,
+			      std::vector<Slic3r::Polygon>               &box_level_polygons,
+			      std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+			      std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons)
+{
+    for (int j = 0; j < object_to_print.pgns_at_height.size(); ++j)
+    {    
+	coord_t height = object_to_print.pgns_at_height[j].first;
+
+	if (!object_to_print.pgns_at_height[j].second.points.empty())
+	{
+	    Polygon decimated_polygon;
+
+	    if (solver_configuration.decimation_precision != SEQ_DECIMATION_PRECISION_UNDEFINED)
+	    {
+		decimate_PolygonForSequentialSolver(solver_configuration,
+						    object_to_print.pgns_at_height[j].second,
+						    decimated_polygon);
+	    }
+	    else
+	    {
+		decimated_polygon = object_to_print.pgns_at_height[j].second;
+		decimated_polygon.make_counter_clockwise();
+	    }
+	    
+	    if (!check_PolygonSize(solver_configuration, SEQ_SLICER_SCALE_FACTOR, decimated_polygon))
+	    {
+		printf("Object too large to fit onto plate.\n");
+		throw std::runtime_error("OBJECT TOO LARGE");
+	    }
+	    
+	    if (printer_geometry.convex_heights.find(height) != printer_geometry.convex_heights.end())
+	    {
+		std::map<coord_t, std::vector<Polygon> >::const_iterator extruder_slice = printer_geometry.extruder_slices.find(height);
+		assert(extruder_slice != printer_geometry.extruder_slices.end());
+		
+		convex_level_polygons.push_back(decimated_polygon);
+		extruder_convex_level_polygons.push_back(extruder_slice->second);
+	    }
+	    else if (printer_geometry.box_heights.find(height) != printer_geometry.box_heights.end())
+	    {
+		std::map<coord_t, std::vector<Polygon> >::const_iterator extruder_slice = printer_geometry.extruder_slices.find(height);
+		assert(extruder_slice != printer_geometry.extruder_slices.end());
+		
+		box_level_polygons.push_back(decimated_polygon);
+		extruder_box_level_polygons.push_back(extruder_slice->second);
+	    }
+	    else
+	    {
+		throw std::runtime_error("MISMATCH BETWEEN OBJECT AND PRINTER SLICE HEIGHTS.");
+	    }
+	}
+    }
+}
+
+
+void prepare_ObjectPolygons(const SolverConfiguration                        &solver_configuration,
+			    const std::vector<Slic3r::Polygon>               &convex_level_polygons,
+			    const std::vector<Slic3r::Polygon>               &box_level_polygons,
+			    const std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+			    const std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons,
+			    Slic3r::Polygon                                  &object_polygon,
+			    std::vector<Slic3r::Polygon>                     &unreachable_polygons)
+{
+    prepare_UnreachableZonePolygons(solver_configuration,
+				    convex_level_polygons,
+				    box_level_polygons,
+				    extruder_convex_level_polygons,
+				    extruder_box_level_polygons,
+				    unreachable_polygons);
+
+    assert(convex_level_polygons.size() >= 1);
+    Polygon raw_polygon = convex_level_polygons[0];
+
+    scaleDown_PolygonForSequentialSolver(raw_polygon,
+					 object_polygon);
+    object_polygon.make_counter_clockwise();    
+}
+
+
+void prepare_UnreachableZonePolygons(const SolverConfiguration                        &solver_configuration,
+				     const Slic3r::Polygon                            &polygon,
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons,					
+				     std::vector<Slic3r::Polygon>                     &unreachable_polygons)
+{
+    std::vector<Slic3r::Polygon> scaled_unreachable_polygons;
+    
+    for (int i = 0; i < extruder_convex_level_polygons.size(); ++i)
+    {
+	extend_PolygonConvexUnreachableZone(solver_configuration,
+					    polygon,
+					    extruder_convex_level_polygons[i],
+					    scaled_unreachable_polygons);
+    }
+
+    for (int i = 0; i < extruder_box_level_polygons.size(); ++i)
+    {
+	extend_PolygonBoxUnreachableZone(solver_configuration,
+					 polygon,
+					 extruder_box_level_polygons[i],
+					 scaled_unreachable_polygons);	
+    }
+
+    for (int i = 0; i < scaled_unreachable_polygons.size(); ++i)
+    {
+	Polygon scale_down_polygon;
+	
+	scaleDown_PolygonForSequentialSolver(scaled_unreachable_polygons[i],
+					     scale_down_polygon);
+	scale_down_polygon.make_counter_clockwise();
+	unreachable_polygons.push_back(scale_down_polygon);
+    }    
+}
+
+
+void prepare_UnreachableZonePolygons(const SolverConfiguration                        &solver_configuration,
+				     const std::vector<Slic3r::Polygon>               &convex_level_polygons,
+				     const std::vector<Slic3r::Polygon>               &box_level_polygons,					
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_convex_level_polygons,
+				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons,					
+				     std::vector<Slic3r::Polygon>                     &unreachable_polygons)
+{
+    std::vector<Slic3r::Polygon> scaled_unreachable_polygons;
+    assert(extruder_convex_level_polygons.size() == convex_level_polygons.size());
+    
+    for (int i = 0; i < extruder_convex_level_polygons.size(); ++i)
+    {
+	extend_PolygonConvexUnreachableZone(solver_configuration,
+					   convex_level_polygons[i],
+					   extruder_convex_level_polygons[i],
+					   scaled_unreachable_polygons);
+    }
+
+    assert(extruder_box_level_polygons.size() == box_level_polygons.size());
+    
+    for (int i = 0; i < extruder_box_level_polygons.size(); ++i)
+    {
+	extend_PolygonBoxUnreachableZone(solver_configuration,
+					box_level_polygons[i],
+					extruder_box_level_polygons[i],
+					scaled_unreachable_polygons);	
+    }
+
+    for (int i = 0; i < scaled_unreachable_polygons.size(); ++i)
+    {
+	Polygon scale_down_polygon;
+	
+	scaleDown_PolygonForSequentialSolver(scaled_unreachable_polygons[i],
+					     scale_down_polygon);
+	scale_down_polygon.make_counter_clockwise();	
+	unreachable_polygons.push_back(scale_down_polygon);
+    }
+}
+
+
+bool check_PolygonSize(const SolverConfiguration &solver_configuration, const Slic3r::Polygon &polygon)
+{
+    BoundingBox polygon_box = get_extents(polygon);
+
+    coord_t x_size = polygon_box.max.x() - polygon_box.min.x();
+    if (x_size > solver_configuration.maximum_X_bounding_box_size)
+    {
+	return false;
+    }
+    
+    coord_t y_size = polygon_box.max.y() - polygon_box.min.y();
+    if (y_size > solver_configuration.maximum_Y_bounding_box_size)
+    {
+	return false;
+    }    
+
+    return true;
+}
+
+
+bool check_PolygonSize(const SolverConfiguration &solver_configuration, coord_t scale_factor, const Slic3r::Polygon &polygon)
+{
+    BoundingBox polygon_box = get_extents(polygon);
+
+    coord_t x_size = polygon_box.max.x() - polygon_box.min.x();
+    if (x_size > solver_configuration.maximum_X_bounding_box_size * scale_factor)
+    {
+	return false;
+    }
+    
+    coord_t y_size = polygon_box.max.y() - polygon_box.min.y();
+    if (y_size > solver_configuration.maximum_Y_bounding_box_size * scale_factor)
+    {
+	return false;
+    }    
+
+    return true;    
+}
+
+
+/*----------------------------------------------------------------*/
+
+double calc_PolygonArea(const Slic3r::Polygon &polygon)
+{
+    Polygons overlapping_polygons;
+
+    overlapping_polygons.push_back(polygon);
+    ExPolygons union_polygons = union_ex(overlapping_polygons);    
+
+    double area = 0;
+    for (const auto& union_polygon: union_polygons)
+    {
+	area += union_polygon.area();
+    }
+
+    return area;    
+}
+
+
+double calc_PolygonUnreachableZoneArea(const Slic3r::Polygon              &polygon,
+				      const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    Polygons overlapping_polygons;
+
+    overlapping_polygons.push_back(polygon);
+    for (const auto& unreachable_polygon: unreachable_polygons)
+    {
+	overlapping_polygons.push_back(unreachable_polygon);
+    }
+    ExPolygons union_polygons = union_ex(overlapping_polygons);
+
+    double area = 0;
+    for (const auto& union_polygon: union_polygons)
+    {
+	area += union_polygon.area();
+    }
+
+    return area;
+}
+
+
+double calc_PolygonArea(const std::vector<Slic3r::Polygon> &polygons)
+{
+    double area = 0;
+
+    for (const auto &polygon: polygons)
+    {
+	area += calc_PolygonArea(polygon);
+    }
+    return area;
+}
+
+
+double calc_PolygonArea(const std::vector<int>             &fixed,
+			const std::vector<int>             &undecided,
+			const std::vector<Slic3r::Polygon> &polygons)
+{
+    double area = 0;
+
+    for (int i = 0; i < fixed.size(); ++i)
+    {
+	area += calc_PolygonArea(polygons[i]);
+    }
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	area += calc_PolygonArea(polygons[i]);
+    }
+    
+    return area;    
+}
+
+
+double calc_PolygonUnreachableZoneArea(const std::vector<Slic3r::Polygon>               &polygons,
+				      const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    assert(polygons.size() == unreachable_polygons.size());
+    double area = 0;
+    
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	area += calc_PolygonUnreachableZoneArea(polygons[i], unreachable_polygons[i]);
+    }
+
+    return area;
+}
+
+
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
+
diff --git a/src/libseqarrange/src/seq_sequential.cpp b/src/libseqarrange/src/seq_sequential.cpp
new file mode 100644
index 0000000000..72670d4f64
--- /dev/null
+++ b/src/libseqarrange/src/seq_sequential.cpp
@@ -0,0 +1,10158 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_sequential.cpp
+ *
+ * SMT models for sequential printing.
+ */
+/*================================================================*/
+
+#include "seq_defs.hpp"
+
+#include "seq_sequential.hpp"
+#include "seq_preprocess.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+using namespace std;
+using namespace Slic3r;
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+
+    
+/*----------------------------------------------------------------*/
+
+int hidden_var_cnt = 0;
+
+
+/*----------------------------------------------------------------*/
+ 
+void introduce_DecisionBox(z3::solver     &Solver,
+			   const z3::expr &dec_var_X,
+			   const z3::expr &dec_var_Y,
+			   int             box_size_x,
+			   int             box_size_y)
+{
+    Solver.add(dec_var_X >= 0);
+    Solver.add(dec_var_X <= box_size_x);
+    Solver.add(dec_var_Y >= 0);
+    Solver.add(dec_var_Y <= box_size_y);
+}
+
+
+void assume_DecisionBox(const z3::expr  &dec_var_X,
+			const z3::expr  &dec_var_Y,
+			int              box_size_x,
+			int              box_size_y,
+			z3::expr_vector &box_constraints)
+{
+    box_constraints.push_back(dec_var_X >= 0);
+    box_constraints.push_back(dec_var_X <= box_size_x);
+    box_constraints.push_back(dec_var_Y >= 0);
+    box_constraints.push_back(dec_var_Y <= box_size_y);
+}
+
+
+void introduce_BedBoundingBox(z3::solver             &Solver,
+			      const z3::expr         &dec_var_X,
+			      const z3::expr         &dec_var_Y,			      
+			      const Slic3r::Polygon &polygon,
+			      int                    box_size_x,
+			      int                    box_size_y)
+{
+    BoundingBox box = get_extents(polygon);
+    
+    Solver.add(dec_var_X + box.min.x() >= 0);
+    Solver.add(dec_var_X + box.max.x() <= box_size_x);
+    
+    Solver.add(dec_var_Y + box.min.y() >= 0);
+    Solver.add(dec_var_Y + box.max.y() <= box_size_y);	    
+}
+
+
+void assume_BedBoundingBox(const z3::expr        &dec_var_X,
+			   const z3::expr        &dec_var_Y,			      
+			   const Slic3r::Polygon &polygon,
+			   int                    box_size_x,
+			   int                    box_size_y,
+			   z3::expr_vector       &bounding_constraints)
+{
+    BoundingBox box = get_extents(polygon);
+    
+    bounding_constraints.push_back(dec_var_X + box.min.x() >= 0);
+    bounding_constraints.push_back(dec_var_X + box.max.x() <= box_size_x);
+    
+    bounding_constraints.push_back(dec_var_Y + box.min.y() >= 0);
+    bounding_constraints.push_back(dec_var_Y + box.max.y() <= box_size_y);    
+}
+
+
+
+
+
+
+void introduce_BedBoundingBox(z3::solver             &Solver,
+			      const z3::expr         &dec_var_X,
+			      const z3::expr         &dec_var_Y,			      
+			      const Slic3r::Polygon &polygon,
+			      int                    box_min_x,
+			      int                    box_min_y,
+			      int                    box_max_x,
+			      int                    box_max_y)    
+{
+    BoundingBox box = get_extents(polygon);
+    
+    Solver.add(dec_var_X + box.min.x() >= box_min_x);
+    Solver.add(dec_var_X + box.max.x() <= box_max_x);
+    
+    Solver.add(dec_var_Y + box.min.y() >= box_min_y);
+    Solver.add(dec_var_Y + box.max.y() <= box_max_y);	    
+}
+
+
+void assume_BedBoundingBox(const z3::expr        &dec_var_X,
+			   const z3::expr        &dec_var_Y,			      
+			   const Slic3r::Polygon &polygon,
+			   int                    box_min_x,
+			   int                    box_min_y,
+			   int                    box_max_x,
+			   int                    box_max_y,			   
+			   z3::expr_vector       &bounding_constraints)
+{
+    BoundingBox box = get_extents(polygon);
+    
+    bounding_constraints.push_back(dec_var_X + box.min.x() >= box_min_x);
+    bounding_constraints.push_back(dec_var_X + box.max.x() <= box_max_x);
+    
+    bounding_constraints.push_back(dec_var_Y + box.min.y() >= box_min_y);
+    bounding_constraints.push_back(dec_var_Y + box.max.y() <= box_max_y);    
+}
+
+
+
+
+
+void introduce_BedBoundingBox(z3::solver                         &Solver,
+			      const z3::expr_vector              &dec_vars_X,
+			      const z3::expr_vector              &dec_vars_Y,
+			      const std::vector<Slic3r::Polygon> &polygons,
+			      int                                 box_size_x,
+			      int                                 box_size_y)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	BoundingBox box = get_extents(polygons[i]);
+
+	Solver.add(dec_vars_X[i] + box.min.x() >= 0);
+	Solver.add(dec_vars_X[i] + box.max.x() <= box_size_x);
+
+	Solver.add(dec_vars_Y[i] + box.min.y() >= 0);
+	Solver.add(dec_vars_Y[i] + box.max.y() <= box_size_y);	
+    }    
+}
+
+
+void assume_BedBoundingBox(const z3::expr_vector              &dec_vars_X,
+			   const z3::expr_vector              &dec_vars_Y,
+			   const std::vector<Slic3r::Polygon> &polygons,
+			   int                                 box_size_x,
+			   int                                 box_size_y,
+			   z3::expr_vector                    &bounding_constraints)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	BoundingBox box = get_extents(polygons[i]);
+
+	bounding_constraints.push_back(dec_vars_X[i] + box.min.x() >= 0);
+	bounding_constraints.push_back(dec_vars_X[i] + box.max.x() <= box_size_x);
+
+	bounding_constraints.push_back(dec_vars_Y[i] + box.min.y() >= 0);
+	bounding_constraints.push_back(dec_vars_Y[i] + box.max.y() <= box_size_y);
+    }
+}
+
+
+void introduce_BedBoundingBox(z3::solver                         &Solver,
+			      const z3::expr_vector              &dec_vars_X,
+			      const z3::expr_vector              &dec_vars_Y,
+			      const std::vector<Slic3r::Polygon> &polygons,
+			      int                                 box_min_x,
+			      int                                 box_min_y,			   
+			      int                                 box_max_x,
+			      int                                 box_max_y)			      
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	BoundingBox box = get_extents(polygons[i]);
+
+	Solver.add(dec_vars_X[i] + box.min.x() >= box_min_x);
+	Solver.add(dec_vars_X[i] + box.max.x() <= box_max_x);
+
+	Solver.add(dec_vars_Y[i] + box.min.y() >= box_min_y);
+	Solver.add(dec_vars_Y[i] + box.max.y() <= box_max_y);	
+    }    
+}
+
+
+void assume_BedBoundingBox_(const z3::expr_vector              &dec_vars_X,
+			    const z3::expr_vector              &dec_vars_Y,
+			    const std::vector<Slic3r::Polygon> &polygons,
+			    int                                 box_min_x,
+			    int                                 box_min_y,			   
+			    int                                 box_max_x,
+			    int                                 box_max_y,
+			    z3::expr_vector                    &bounding_constraints)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	BoundingBox box = get_extents(polygons[i]);
+
+	bounding_constraints.push_back(dec_vars_X[i] + box.min.x() >= box_min_x);
+	bounding_constraints.push_back(dec_vars_X[i] + box.max.x() <= box_max_x);
+
+	bounding_constraints.push_back(dec_vars_Y[i] + box.min.y() >= box_min_y);
+	bounding_constraints.push_back(dec_vars_Y[i] + box.max.y() <= box_max_y);
+    }
+}
+
+
+void assume_ConsequentialObjectPresence(z3::context            &Context,
+					const z3::expr_vector  &dec_vars_T,
+					const std::vector<int> &present,
+					const std::vector<int> &missing,
+					z3::expr_vector        &presence_constraints)
+{
+    for (int i = 0; i < present.size(); ++i)
+    {
+	presence_constraints.push_back(dec_vars_T[present[i]] > Context.real_val(SEQ_TEMPORAL_PRESENCE_THRESHOLD));
+    }
+
+    for (int i = 0; i < missing.size(); ++i)
+    {
+	presence_constraints.push_back(dec_vars_T[missing[i]] < Context.real_val(SEQ_TEMPORAL_ABSENCE_THRESHOLD));
+    }    
+}
+
+
+void introduce_TemporalOrdering(z3::solver                         &Solver,
+				z3::context                        &SEQ_UNUSED(Context),
+				const z3::expr_vector              &dec_vars_T,
+				int                                temporal_spread,				
+				const std::vector<Slic3r::Polygon> &polygons)
+{
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    Solver.add(dec_vars_T[i] > dec_vars_T[j] + temporal_spread || dec_vars_T[i] + temporal_spread < dec_vars_T[j]);
+	}
+    }
+}
+
+
+void introduce_SequentialTemporalOrderingAgainstFixed(z3::solver                         &Solver,
+						      z3::context                        &Context,
+						      const z3::expr_vector              &dec_vars_T,
+						      std::vector<Rational>              &dec_values_T,
+						      const std::vector<int>             &fixed,
+						      const std::vector<int>             &undecided,
+						      int                                temporal_spread,
+						      const std::vector<Slic3r::Polygon> &SEQ_UNUSED(polygons))
+{
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+	    Solver.add(dec_vars_T[undecided[i]] > dec_vars_T[undecided[j]] + temporal_spread || dec_vars_T[undecided[i]] + temporal_spread < dec_vars_T[undecided[j]]);
+	}
+    }
+
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+	    Solver.add(   dec_vars_T[undecided[i]] > Context.real_val(dec_values_T[fixed[j]].numerator, dec_values_T[fixed[j]].denominator) + temporal_spread
+		       || dec_vars_T[undecided[i]] + temporal_spread < Context.real_val(dec_values_T[fixed[j]].numerator, dec_values_T[fixed[j]].denominator));
+	}	
+    }
+
+    #ifdef DEBUG
+    {
+	printf("Origo\n");
+	for (int i = 0; i < fixed.size(); ++i)
+	{
+	    printf("%.3f\n", dec_values_T[fixed[i]].as_double());
+	}
+    }
+    #endif
+}
+
+
+void introduce_ConsequentialTemporalOrderingAgainstFixed(z3::solver                         &Solver,
+							 z3::context                        &Context,
+							 const z3::expr_vector              &dec_vars_T,
+							 std::vector<Rational>              &dec_values_T,
+							 const std::vector<int>             &fixed,
+							 const std::vector<int>             &undecided,
+							 int                                temporal_spread,
+							 const std::vector<Slic3r::Polygon> &SEQ_UNUSED(polygons))
+{
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+	    Solver.add(dec_vars_T[undecided[i]] > dec_vars_T[undecided[j]] + temporal_spread || dec_vars_T[undecided[i]] + temporal_spread < dec_vars_T[undecided[j]]);
+	}
+    }
+
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+	    Solver.add(   dec_vars_T[undecided[i]] > Context.real_val(dec_values_T[fixed[j]].numerator, dec_values_T[fixed[j]].denominator) + temporal_spread
+		       || dec_vars_T[undecided[i]] + temporal_spread < Context.real_val(dec_values_T[fixed[j]].numerator, dec_values_T[fixed[j]].denominator));
+	}	
+    }
+
+    #ifdef DEBUG
+    {
+	printf("Origo\n");
+	for (int i = 0; i < fixed.size(); ++i)
+	{
+	    printf("%.3f\n", dec_values_T[fixed[i]].as_double());
+	}
+    }
+    #endif
+}
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_LineNonIntersection(z3::solver         &Solver,
+				   z3::context        &Context,				   
+				   const z3::expr     &dec_var_X1,
+				   const z3::expr     &dec_var_Y1,
+				   const z3::expr     &dec_var_T1,
+				   const Slic3r::Line &line1,
+				   const z3::expr     &dec_var_X2,
+				   const z3::expr     &dec_var_Y2,
+				   const z3::expr     &dec_var_T2,				   
+				   const Slic3r::Line &line2)
+{
+    introduce_LineNonIntersection_implicit(Solver,
+					   Context,
+					   dec_var_X1,
+					   dec_var_Y1,
+					   dec_var_T1,
+					   line1,
+					   dec_var_X2,
+					   dec_var_Y2,
+					   dec_var_T2,				   
+					   line2);    
+}
+
+
+void introduce_SequentialLineNonIntersection(z3::solver         &Solver,
+					     z3::context        &Context,
+					     const z3::expr     &dec_var_X1,
+					     const z3::expr     &dec_var_Y1,
+					     const z3::expr     &dec_var_T1,
+					     const z3::expr     &dec_var_t1,
+					     const Slic3r::Line &line1,
+					     const z3::expr     &dec_var_X2,
+					     const z3::expr     &dec_var_Y2,
+					     const z3::expr     &dec_var_T2,
+					     const z3::expr     &dec_var_t2,
+					     const Slic3r::Line &line2)
+{
+    introduce_SequentialLineNonIntersection_implicit(Solver,
+						     Context,
+						     dec_var_X1,
+						     dec_var_Y1,
+						     dec_var_T1,
+						     dec_var_t1,					   
+						     line1,
+						     dec_var_X2,
+						     dec_var_Y2,
+						     dec_var_T2,
+						     dec_var_t2,
+						     line2);    
+}
+
+
+void introduce_ConsequentialLineNonIntersection(z3::solver         &Solver,
+						z3::context        &Context,
+						const z3::expr     &dec_var_X1,
+						const z3::expr     &dec_var_Y1,
+						const z3::expr     &dec_var_T1,
+						const z3::expr     &dec_var_t1,
+						const Slic3r::Line &line1,
+						const z3::expr     &dec_var_X2,
+						const z3::expr     &dec_var_Y2,
+						const z3::expr     &dec_var_T2,
+						const z3::expr     &dec_var_t2,
+						const Slic3r::Line &line2)
+{
+    introduce_ConsequentialLineNonIntersection_implicit(Solver,
+							Context,
+							dec_var_X1,
+							dec_var_Y1,
+							dec_var_T1,
+							dec_var_t1,					   
+							line1,
+							dec_var_X2,
+							dec_var_Y2,
+							dec_var_T2,
+							dec_var_t2,
+							line2);    
+}
+
+
+void introduce_LineNonIntersection_implicit(z3::solver         &Solver,
+					    z3::context        &Context,					    
+					    const z3::expr     &dec_var_X1,
+					    const z3::expr     &dec_var_Y1,
+					    const z3::expr     &dec_var_T1,				   
+					    const Slic3r::Line &line1,
+					    const z3::expr     &dec_var_X2,
+					    const z3::expr     &dec_var_Y2,
+					    const z3::expr     &dec_var_T2,
+					    const Slic3r::Line &line2)
+{    
+    Point point;
+    
+    if (line1.intersection_infinite(line2, &point))
+    {
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+	
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+
+	#ifdef DEBUG
+	{
+	    printf("adding constraint iota: [%d, %d, %d, %d] [%d, %d, %d, %d]\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		   line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y());
+	}
+	#endif
+	
+	Solver.add((dec_var_X1 + line1.a.x() + v1x * dec_var_T1) == (dec_var_X2 + line2.a.x() + v2x * dec_var_T2));
+	Solver.add((dec_var_Y1 + line1.a.y() + v1y * dec_var_T1) == (dec_var_Y2 + line2.a.y() + v2y * dec_var_T2));
+	
+	Solver.add(   dec_var_T1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_T1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+		   || dec_var_T2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_T2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+    }
+}
+
+
+void introduce_SequentialLineNonIntersection_implicit(z3::solver         &Solver,
+						      z3::context        &Context,						      
+						      const z3::expr     &dec_var_X1,
+						      const z3::expr     &dec_var_Y1,
+						      const z3::expr     &dec_var_T1,
+						      const z3::expr     &dec_var_t1,
+						      const Slic3r::Line &line1,
+						      const z3::expr     &dec_var_X2,
+						      const z3::expr     &dec_var_Y2,
+						      const z3::expr     &dec_var_T2,
+						      const z3::expr     &dec_var_t2,
+						      const Slic3r::Line &line2)
+{    
+    Point point;
+    
+    if (line1.intersection_infinite(line2, &point))
+    {
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+	
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+
+        #ifdef DEBUG
+	{
+	    printf("adding constraint seq: [%d, %d, %d, %d] [%d, %d, %d, %d]\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		   line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y());
+	}
+	#endif
+	
+	Solver.add((dec_var_X1 + line1.a.x() + v1x * dec_var_t1) == (dec_var_X2 + line2.a.x() + v2x * dec_var_t2));
+	Solver.add((dec_var_Y1 + line1.a.y() + v1y * dec_var_t1) == (dec_var_Y2 + line2.a.y() + v2y * dec_var_t2));
+	
+//	Solver.add(dec_var_T1 < dec_var_T2 || dec_var_t1 < 0 || dec_var_t1 > 1 || dec_var_t2 < 0 || dec_var_t2 > 1);
+	Solver.add(   dec_var_T1 < dec_var_T2
+		   || dec_var_t1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_t1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+		   || dec_var_t2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_t2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+    }
+}
+
+
+void introduce_ConsequentialLineNonIntersection_implicit(z3::solver         &Solver,
+							 z3::context        &Context,						      
+							 const z3::expr     &dec_var_X1,
+							 const z3::expr     &dec_var_Y1,
+							 const z3::expr     &dec_var_T1,
+							 const z3::expr     &dec_var_t1,
+							 const Slic3r::Line &line1,
+							 const z3::expr     &dec_var_X2,
+							 const z3::expr     &dec_var_Y2,
+							 const z3::expr     &dec_var_T2,
+							 const z3::expr     &dec_var_t2,
+							 const Slic3r::Line &line2)
+{    
+    Point point;
+    
+    if (line1.intersection_infinite(line2, &point))
+    {
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+	
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+
+        #ifdef DEBUG
+	{
+	    printf("adding constraint seq: [%d, %d, %d, %d] [%d, %d, %d, %d]\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		   line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y());
+	}
+	#endif
+	
+	Solver.add((dec_var_X1 + line1.a.x() + v1x * dec_var_t1) == (dec_var_X2 + line2.a.x() + v2x * dec_var_t2));
+	Solver.add((dec_var_Y1 + line1.a.y() + v1y * dec_var_t1) == (dec_var_Y2 + line2.a.y() + v2y * dec_var_t2));
+	
+//	Solver.add(dec_var_T1 < dec_var_T2 || dec_var_t1 < 0 || dec_var_t1 > 1 || dec_var_t2 < 0 || dec_var_t2 > 1);
+	Solver.add(   dec_var_T1 < 0
+		   || dec_var_T2 < 0
+		   || dec_var_T1 < dec_var_T2
+		   || dec_var_t1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_t1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+		   || dec_var_t2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_t2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+    }
+}
+
+
+void introduce_LineNonIntersection_explicit(z3::solver         &Solver,
+					    z3::context        &Context,					    
+					    const z3::expr     &dec_var_X1,
+					    const z3::expr     &dec_var_Y1,
+					    const z3::expr     &dec_var_T1,				   
+					    const Slic3r::Line &line1,
+					    const z3::expr     &dec_var_X2,
+					    const z3::expr     &dec_var_Y2,
+					    const z3::expr     &dec_var_T2,
+					    const Slic3r::Line &line2)
+{
+    Point point;
+    if (line1.intersection_infinite(line2, &point))
+    {    
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+	
+	if (abs(v2x) > 0)
+	{
+	    int coef_T1 = v1y * v2x - v1x * v2y;
+	    int d1 = v2x * line1.a.y() - v2x * line2.a.y() - v2y * line1.a.x() + v2y * line2.a.x();
+	    
+	    int coef_X1 = -v2y;
+	    int coef_Y1 = v2x;
+	    
+	    int coef_X2 = v2y;
+	    int coef_Y2 = -v2x;
+	    
+	    Solver.add( ((coef_X1 * dec_var_X1)
+			 + (coef_Y1 * dec_var_Y1)
+			 + (coef_X2 * dec_var_X2)
+			 + (coef_Y2 * dec_var_Y2)
+			 + (coef_T1 * dec_var_T1)
+			 + d1) == 0);
+
+	    int d2 = line1.a.x() - line2.a.x();
+	    
+	    Solver.add( (dec_var_X1
+			 - dec_var_X2
+			 + v1x * dec_var_T1
+			 - v2x * dec_var_T2
+			 + d2) == 0);
+	    
+	    Solver.add(   dec_var_T1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		       || dec_var_T1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+		       || dec_var_T2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		       || dec_var_T2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+	}
+	else
+	{
+	    if (abs(v2y) > 0)
+	    {
+		int coef_T2 = v1y * v2x - v1x * v2y;
+		int d1 = v2y * line1.a.x() - v2y * line2.a.x() - v2x * line1.a.y() + v2x * line2.a.y();
+		
+		int coef_X1 = v2y;
+		int coef_Y1 = -v2x;
+		
+		int coef_X2 = -v2y;
+		int coef_Y2 = v2x;
+		
+		Solver.add( ((coef_X1 * dec_var_X1)
+			     + (coef_Y1 * dec_var_Y1)
+			     + (coef_X2 * dec_var_X2)
+			     + (coef_Y2 * dec_var_Y2)
+			     + (coef_T2 * dec_var_T2)
+			     + d1) == 0);	    
+		
+		int d2 = line1.a.y() - line2.a.y();
+		
+		Solver.add( (dec_var_Y1
+			     - dec_var_Y2
+			     + v1y * dec_var_T1
+			     - v2y* dec_var_T2
+			     + d2) == 0);
+		
+		Solver.add(   dec_var_T1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+			   || dec_var_T1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+			   || dec_var_T2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+			   || dec_var_T2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));	    
+	    }
+	    else
+	    {
+		/* intersection not possible, the second line is empty */
+		assert(false);
+	    }
+	}
+    }
+}
+
+
+
+void introduce_LineNonIntersectionAgainstFixedLine(z3::solver         &Solver,
+						   z3::context        &Context,
+						   const z3::expr     &dec_var_X1,
+						   const z3::expr     &dec_var_Y1,
+						   const z3::expr     &dec_var_T1,
+						   const Slic3r::Line &line1,
+						   const Rational     &dec_value_X2,
+						   const Rational     &dec_value_Y2,
+						   const z3::expr     &dec_var_T2,				   
+						   const Slic3r::Line &line2)
+{
+    introduce_LineNonIntersectionAgainstFixedLine_implicit(Solver,
+							   Context,
+							   dec_var_X1,
+							   dec_var_Y1,
+							   dec_var_T1,
+							   line1,
+							   dec_value_X2,
+							   dec_value_Y2,
+							   dec_var_T2,				   
+							   line2);    
+}
+
+
+void introduce_SequentialLineNonIntersectionAgainstFixedLine(z3::solver         &Solver,
+							     z3::context        &Context,
+							     const z3::expr     &dec_var_X1,
+							     const z3::expr     &dec_var_Y1,
+							     const z3::expr     &dec_var_T1,
+							     const z3::expr     &dec_var_t1,
+							     const Slic3r::Line &line1,
+							     const Rational     &dec_value_X2,
+							     const Rational     &dec_value_Y2,
+							     const Rational     &dec_value_T2,
+							     const z3::expr     &dec_var_t2,
+							     const Slic3r::Line &line2)
+{
+    introduce_SequentialLineNonIntersectionAgainstFixedLine_implicit(Solver,
+								     Context,
+								     dec_var_X1,
+								     dec_var_Y1,
+								     dec_var_T1,
+								     dec_var_t1,
+								     line1,
+								     dec_value_X2,
+								     dec_value_Y2,
+								     dec_value_T2,
+								     dec_var_t2,
+								     line2);    
+}
+
+
+void introduce_SequentialFixedLineNonIntersectionAgainstLine(z3::solver         &Solver,
+							     z3::context        &Context,
+							     const Rational     &dec_value_X1,
+							     const Rational     &dec_value_Y1,
+							     const Rational     &dec_value_T1,
+							     const z3::expr     &dec_var_t1,
+							     const Slic3r::Line &line1,
+							     const z3::expr     &dec_var_X2,
+							     const z3::expr     &dec_var_Y2,
+							     const z3::expr     &dec_var_T2,
+							     const z3::expr     &dec_var_t2,
+							     const Slic3r::Line &line2)
+{
+    introduce_SequentialFixedLineNonIntersectionAgainstLine_implicit(Solver,
+								     Context,
+								     dec_value_X1,
+								     dec_value_Y1,
+								     dec_value_T1,
+								     dec_var_t1,
+								     line1,
+								     dec_var_X2,
+								     dec_var_Y2,
+								     dec_var_T2,
+								     dec_var_t2,
+								     line2);    
+}
+
+
+void introduce_ConsequentialLineNonIntersectionAgainstFixedLine(z3::solver         &Solver,
+								z3::context        &Context,
+								const z3::expr     &dec_var_X1,
+								const z3::expr     &dec_var_Y1,
+								const z3::expr     &dec_var_T1,
+								const z3::expr     &dec_var_t1,
+								const Slic3r::Line &line1,
+								const Rational     &dec_value_X2,
+								const Rational     &dec_value_Y2,
+								const Rational     &dec_value_T2,
+								const z3::expr     &dec_var_t2,
+								const Slic3r::Line &line2)
+{
+    introduce_ConsequentialLineNonIntersectionAgainstFixedLine_implicit(Solver,
+									Context,
+									dec_var_X1,
+									dec_var_Y1,
+									dec_var_T1,
+									dec_var_t1,
+									line1,
+									dec_value_X2,
+									dec_value_Y2,
+									dec_value_T2,
+									dec_var_t2,
+									line2);    
+}
+
+
+void introduce_ConsequentialFixedLineNonIntersectionAgainstLine(z3::solver         &Solver,
+								z3::context        &Context,
+								const Rational     &dec_value_X1,
+								const Rational     &dec_value_Y1,
+								const Rational     &dec_value_T1,
+								const z3::expr     &dec_var_t1,
+								const Slic3r::Line &line1,
+								const z3::expr     &dec_var_X2,
+								const z3::expr     &dec_var_Y2,
+								const z3::expr     &dec_var_T2,
+								const z3::expr     &dec_var_t2,
+								const Slic3r::Line &line2)
+{
+    introduce_ConsequentialFixedLineNonIntersectionAgainstLine_implicit(Solver,
+									Context,
+									dec_value_X1,
+									dec_value_Y1,
+									dec_value_T1,
+									dec_var_t1,
+									line1,
+									dec_var_X2,
+									dec_var_Y2,
+									dec_var_T2,
+									dec_var_t2,
+									line2);    
+}
+
+
+void introduce_LineNonIntersectionAgainstFixedLine_implicit(z3::solver         &Solver,
+							    z3::context        &Context,
+							    const z3::expr     &dec_var_X1,
+							    const z3::expr     &dec_var_Y1,
+							    const z3::expr     &dec_var_T1,
+							    const Slic3r::Line &line1,
+							    const Rational     &dec_value_X2,
+							    const Rational     &dec_value_Y2,
+							    const z3::expr     &dec_var_T2,
+							    const Slic3r::Line &line2)
+{    
+    Point point;
+    
+    if (line1.intersection_infinite(line2, &point))
+    {
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+	
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+
+	#ifdef DEBUG
+	{
+	    printf("adding constraint alpha [%d, %d, %d, %d] [%d, %d, %d, %d]\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		   line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y());
+	}
+	#endif
+	
+	Solver.add((dec_var_X1 + line1.a.x() + v1x * dec_var_T1) == (Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator) + line2.a.x() + v2x * dec_var_T2));
+	Solver.add((dec_var_Y1 + line1.a.y() + v1y * dec_var_T1) == (Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator) + line2.a.y() + v2y * dec_var_T2));
+	
+	Solver.add(   dec_var_T1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_T1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+		   || dec_var_T2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_T2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+    }
+}
+
+
+void introduce_LineNonIntersectionAgainstFixedLine_explicit(z3::solver         &Solver,
+							    z3::context        &Context,
+							    const z3::expr     &dec_var_X1,
+							    const z3::expr     &dec_var_Y1,
+							    const z3::expr     &dec_var_T1,
+							    const Slic3r::Line &line1,
+							    const Rational     &dec_value_X2,
+							    const Rational     &dec_value_Y2,
+							    const z3::expr     &dec_var_T2,
+							    const Slic3r::Line &line2)
+{
+    Point point;
+    if (line1.intersection_infinite(line2, &point))
+    {    
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+	
+	if (abs(v2x) > 0)
+	{
+	    int coef_T1 = v1y * v2x - v1x * v2y;
+	    int d1 = v2x * line1.a.y() - v2x * line2.a.y() - v2y * line1.a.x() + v2y * line2.a.x();
+	    
+	    int coef_X1 = -v2y;
+	    int coef_Y1 = v2x;
+	    
+	    int coef_X2 = v2y;
+	    int coef_Y2 = -v2x;
+	    
+	    Solver.add( ((coef_X1 * dec_var_X1)
+			 + (coef_Y1 * dec_var_Y1)
+			 + (coef_X2 * Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator))
+			 + (coef_Y2 * Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator))
+			 + (coef_T1 * dec_var_T1)
+			 + d1) == 0);
+
+	    int d2 = line1.a.x() - line2.a.x();
+	    
+	    Solver.add( (dec_var_X1
+			 - Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator)
+			 + v1x * dec_var_T1
+			 - v2x * dec_var_T2
+			 + d2) == 0);
+	    
+	    Solver.add(   dec_var_T1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		       || dec_var_T1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+		       || dec_var_T2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		       || dec_var_T2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+	}
+	else
+	{
+	    if (abs(v2y) > 0)
+	    {
+		int coef_T2 = v1y * v2x - v1x * v2y;
+		int d1 = v2y * line1.a.x() - v2y * line2.a.x() - v2x * line1.a.y() + v2x * line2.a.y();
+		
+		int coef_X1 = v2y;
+		int coef_Y1 = -v2x;
+		
+		int coef_X2 = -v2y;
+		int coef_Y2 = v2x;
+		
+		Solver.add( (  (coef_X1 * dec_var_X1)
+			     + (coef_Y1 * dec_var_Y1)
+			     + (coef_X2 * Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator))
+			     + (coef_Y2 * Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator))
+			     + (coef_T2 * dec_var_T2)
+			     + d1) == 0);	    
+		
+		int d2 = line1.a.y() - line2.a.y();
+		
+		Solver.add( (  dec_var_Y1
+			     - Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator)
+			     + v1y * dec_var_T1
+			     - v2y* dec_var_T2
+			     + d2) == 0);
+		
+		Solver.add(   dec_var_T1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+			   || dec_var_T1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+			   || dec_var_T2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+			   || dec_var_T2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));	    
+	    }
+	    else
+	    {
+		/* intersection not possible, the second line is empty */
+		assert(false);
+	    }
+	}
+    }
+}
+
+
+void introduce_SequentialLineNonIntersectionAgainstFixedLine_implicit(z3::solver         &Solver,
+								      z3::context        &Context,
+								      const z3::expr     &dec_var_X1,
+								      const z3::expr     &dec_var_Y1,
+								      const z3::expr     &dec_var_T1,
+								      const z3::expr     &dec_var_t1,
+								      const Slic3r::Line &line1,
+								      const Rational     &dec_value_X2,
+								      const Rational     &dec_value_Y2,
+								      const Rational     &dec_value_T2,
+								      const z3::expr     &dec_var_t2,
+								      const Slic3r::Line &line2)
+{    
+    Point point;
+    
+    if (line1.intersection_infinite(line2, &point))
+    {
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+	
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+
+	#ifdef DEBUG
+	{
+	    printf("adding constraint beta: [%d, %d, %d, %d] [%d, %d, %d, %d] (%.3f,%.3f,%.3f)\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		   line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y(), dec_value_X2.as_double(), dec_value_Y2.as_double(), dec_value_T2.as_double());
+	    printf("v1: %d,%d v2:%d,%d\n", v1x, v1y, v2x, v2y);
+	}
+        #endif
+	
+	Solver.add((dec_var_X1 + line1.a.x() + v1x * dec_var_t1) == (Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator) + line2.a.x() + v2x * dec_var_t2));
+	Solver.add((dec_var_Y1 + line1.a.y() + v1y * dec_var_t1) == (Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator) + line2.a.y() + v2y * dec_var_t2));
+
+	Solver.add(   (dec_var_T1 < Context.real_val(dec_value_T2.numerator, dec_value_T2.denominator))
+		   || (dec_var_t1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN))
+		   || (dec_var_t1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX))
+		   || (dec_var_t2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN))
+		   || (dec_var_t2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)));
+    }
+}
+
+
+void introduce_SequentialFixedLineNonIntersectionAgainstLine_implicit(z3::solver         &Solver,
+								      z3::context        &Context,
+								      const Rational     &dec_value_X1,
+								      const Rational     &dec_value_Y1,
+								      const Rational     &dec_value_T1,
+								      const z3::expr     &dec_var_t1,
+								      const Slic3r::Line &line1,
+								      const z3::expr     &dec_var_X2,
+ 								      const z3::expr     &dec_var_Y2,
+								      const z3::expr     &dec_var_T2,
+								      const z3::expr     &dec_var_t2,
+								      const Slic3r::Line &line2)
+{    
+    Point point;
+    
+    if (line1.intersection_infinite(line2, &point))
+    {
+	int v1x = line1.b.x() - line1.a.x();
+	int v1y = line1.b.y() - line1.a.y();
+	
+	int v2x = line2.b.x() - line2.a.x();
+	int v2y = line2.b.y() - line2.a.y();
+
+	#ifdef DEBUG
+	{
+	    printf("adding constraint gamma: [%d, %d, %d, %d] [%d, %d, %d, %d]\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		   line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y());
+	}
+	#endif
+	
+	Solver.add((Context.real_val(dec_value_X1.numerator, dec_value_X1.denominator) + line1.a.x() + v1x * dec_var_t1) == (dec_var_X2 + line2.a.x() + v2x * dec_var_t2));
+	Solver.add((Context.real_val(dec_value_Y1.numerator, dec_value_Y1.denominator) + line1.a.y() + v1y * dec_var_t1) == (dec_var_Y2 + line2.a.y() + v2y * dec_var_t2));
+	
+	Solver.add(   Context.real_val(dec_value_T1.numerator, dec_value_T1.denominator) < dec_var_T2
+	           || dec_var_t1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_t1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+		   || dec_var_t2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+		   || dec_var_t2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+    }
+}
+
+
+void introduce_ConsequentialLineNonIntersectionAgainstFixedLine_implicit(z3::solver         &Solver,
+									 z3::context        &Context,
+									 const z3::expr     &dec_var_X1,
+									 const z3::expr     &dec_var_Y1,
+									 const z3::expr     &dec_var_T1,
+									 const z3::expr     &dec_var_t1,
+									 const Slic3r::Line &line1,
+									 const Rational     &dec_value_X2,
+									 const Rational     &dec_value_Y2,
+									 const Rational     &dec_value_T2,
+									 const z3::expr     &dec_var_t2,
+									 const Slic3r::Line &line2)
+{
+
+    if (dec_value_T2.is_Positive())
+    {
+	Point point;
+    
+	if (line1.intersection_infinite(line2, &point))
+	{
+	    int v1x = line1.b.x() - line1.a.x();
+	    int v1y = line1.b.y() - line1.a.y();
+	    
+	    int v2x = line2.b.x() - line2.a.x();
+	    int v2y = line2.b.y() - line2.a.y();
+
+	    #ifdef DEBUG
+	    {
+		printf("adding constraint beta: [%d, %d, %d, %d] [%d, %d, %d, %d] (%.3f,%.3f,%.3f)\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		       line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y(), dec_value_X2.as_double(), dec_value_Y2.as_double(), dec_value_T2.as_double());
+		printf("v1: %d,%d v2:%d,%d\n", v1x, v1y, v2x, v2y);
+	    }
+	    #endif
+	
+	    Solver.add((dec_var_X1 + line1.a.x() + v1x * dec_var_t1) == (Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator) + line2.a.x() + v2x * dec_var_t2));
+	    Solver.add((dec_var_Y1 + line1.a.y() + v1y * dec_var_t1) == (Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator) + line2.a.y() + v2y * dec_var_t2));
+	    
+	    Solver.add(    dec_var_T1 < 0
+		       || (dec_var_T1 < Context.real_val(dec_value_T2.numerator, dec_value_T2.denominator))
+		       || (dec_var_t1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN))
+		       || (dec_var_t1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX))
+		       || (dec_var_t2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN))
+		       || (dec_var_t2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)));
+	}
+    }
+}
+
+
+void introduce_ConsequentialFixedLineNonIntersectionAgainstLine_implicit(z3::solver         &Solver,
+									 z3::context        &Context,
+									 const Rational     &dec_value_X1,
+									 const Rational     &dec_value_Y1,
+									 const Rational     &dec_value_T1,
+									 const z3::expr     &dec_var_t1,
+									 const Slic3r::Line &line1,
+									 const z3::expr     &dec_var_X2,
+									 const z3::expr     &dec_var_Y2,
+									 const z3::expr     &dec_var_T2,
+									 const z3::expr     &dec_var_t2,
+									 const Slic3r::Line &line2)
+{
+    if (dec_value_T1.is_Positive())
+    {
+	Point point;
+    
+	if (line1.intersection_infinite(line2, &point))
+	{
+	    int v1x = line1.b.x() - line1.a.x();
+	    int v1y = line1.b.y() - line1.a.y();
+	    
+	    int v2x = line2.b.x() - line2.a.x();
+	    int v2y = line2.b.y() - line2.a.y();
+	    
+	    #ifdef DEBUG
+	    {
+		printf("adding constraint gamma: [%d, %d, %d, %d] [%d, %d, %d, %d]\n", line1.a.x(), line1.a.y(), line1.b.x(), line1.b.y(),
+		       line2.a.x(), line2.a.y(), line2.b.x(), line2.b.y());
+	    }
+	    #endif
+	
+	    Solver.add((Context.real_val(dec_value_X1.numerator, dec_value_X1.denominator) + line1.a.x() + v1x * dec_var_t1) == (dec_var_X2 + line2.a.x() + v2x * dec_var_t2));
+	    Solver.add((Context.real_val(dec_value_Y1.numerator, dec_value_Y1.denominator) + line1.a.y() + v1y * dec_var_t1) == (dec_var_Y2 + line2.a.y() + v2y * dec_var_t2));
+	
+	    Solver.add(     dec_var_T2 < 0
+			|| Context.real_val(dec_value_T1.numerator, dec_value_T1.denominator) < dec_var_T2
+			|| dec_var_t1 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+			|| dec_var_t1 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX)
+			|| dec_var_t2 < Context.real_val(SEQ_INTERSECTION_REPULSION_MIN)
+			|| dec_var_t2 > Context.real_val(SEQ_INTERSECTION_REPULSION_MAX));
+	}
+    }
+}
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_PointInsideHalfPlane(z3::solver         &Solver,
+				    const z3::expr     &dec_var_X1,
+				    const z3::expr     &dec_var_Y1,
+				    const z3::expr     &dec_var_X2,
+				    const z3::expr     &dec_var_Y2,
+				    const Slic3r::Line &halving_line)
+{
+    Vector normal = halving_line.normal();
+
+    Solver.add(  (normal.x() * dec_var_X1)
+	       + (normal.y() * dec_var_Y1)		 
+	       - (normal.x() * dec_var_X2 + normal.x() * halving_line.a.x())
+	       - (normal.y() * dec_var_Y2 + normal.y() * halving_line.a.y()) < 0);
+}
+
+
+void introduce_PointOutsideHalfPlane(z3::solver         &Solver,
+				     const z3::expr     &dec_var_X1,
+				     const z3::expr     &dec_var_Y1,
+				     const z3::expr     &dec_var_X2,
+				     const z3::expr     &dec_var_Y2,
+				     const Slic3r::Line &halving_line)
+{
+    Vector normal = halving_line.normal();
+
+    Solver.add(  (normal.x() * dec_var_X1)
+	       + (normal.y() * dec_var_Y1)		 
+	       - (normal.x() * dec_var_X2 + normal.x() * halving_line.a.x())
+	       - (normal.y() * dec_var_Y2 + normal.y() * halving_line.a.y()) > 0);
+}
+
+
+void introduce_PointInsidePolygon(z3::solver            &Solver,
+				  z3::context           &Context,
+				  const z3::expr        &dec_var_X1,
+				  const z3::expr        &dec_var_Y1,
+				  const z3::expr        &dec_var_X2,
+				  const z3::expr        &dec_var_Y2,
+				  const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {   
+	z3::expr in_conjunction(Context);
+
+	for (Points::const_iterator point = polygon.points.begin(); point != polygon.points.end(); ++point)
+	{
+	    Points::const_iterator next_point = point + 1;
+	    if (next_point == polygon.points.end())
+	    {
+		next_point = polygon.points.begin();
+	    }
+	    
+	    Line line(*point, *next_point);
+	    Vector normal = line.normal();
+	    
+	    z3::expr inside_half_plane(  (normal.x() * dec_var_X1)
+				       + (normal.y() * dec_var_Y1)		 
+				       - (normal.x() * dec_var_X2)
+				       - (normal.x() * line.a.x())
+				       - (normal.y() * dec_var_Y2)
+				       - (normal.y() * line.a.y()) < 0);
+
+	    if (point == polygon.points.begin())
+	    {
+		in_conjunction = inside_half_plane;
+	    }
+	    else
+	    {
+		in_conjunction = in_conjunction && inside_half_plane;
+	    }
+	}
+
+	Solver.add(in_conjunction);
+    }
+}
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_PointOutsidePolygon(z3::solver            &Solver,
+				   z3::context           &Context,
+				   const z3::expr        &dec_var_X1,
+				   const z3::expr        &dec_var_Y1,
+				   const z3::expr        &dec_var_X2,
+				   const z3::expr        &dec_var_Y2,
+				   const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {  
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon.points.size();
+	    
+	    Line line(polygon.points[p], polygon.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+				        + (normal.y() * dec_var_Y1)		 
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_SequentialPointOutsidePolygon(z3::solver            &Solver,
+					     z3::context           &Context,
+					     const z3::expr        &dec_var_X1,
+					     const z3::expr        &dec_var_Y1,
+					     const z3::expr        &dec_var_T1,
+					     const z3::expr        &dec_var_X2,
+					     const z3::expr        &dec_var_Y2,
+					     const z3::expr        &dec_var_T2,
+					     const Slic3r::Polygon &polygon2)
+{
+    if (polygon2.points.size() >= 3)
+    {
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon2.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon2.points.size();
+	    
+	    Line line(polygon2.points[p], polygon2.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+					+ (normal.y() * dec_var_Y1)		 
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (dec_var_T1 < dec_var_T2) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+	
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_ConsequentialPointOutsidePolygon(z3::solver            &Solver,
+						z3::context           &Context,
+						const z3::expr        &dec_var_X1,
+						const z3::expr        &dec_var_Y1,
+						const z3::expr        &dec_var_T1,
+						const z3::expr        &dec_var_X2,
+						const z3::expr        &dec_var_Y2,
+						const z3::expr        &dec_var_T2,
+						const Slic3r::Polygon &polygon2)
+{
+    if (polygon2.points.size() >= 3)
+    {
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon2.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon2.points.size();
+	    
+	    Line line(polygon2.points[p], polygon2.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+					+ (normal.y() * dec_var_Y1)		 
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (dec_var_T1 < 0) || (dec_var_T2 < 0) || (dec_var_T1 < dec_var_T2) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_ShiftSequentialPointOutsidePolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  int                    x,
+						  int                    y,
+						  const z3::expr        &dec_var_X1,
+						  const z3::expr        &dec_var_Y1,
+						  const z3::expr        &dec_var_T1,
+						  const z3::expr        &dec_var_X2,
+						  const z3::expr        &dec_var_Y2,
+						  const z3::expr        &dec_var_T2,
+						  const Slic3r::Polygon &polygon2)
+{
+    if (polygon2.points.size() >= 3)
+    {    
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon2.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon2.points.size();
+	    
+	    Line line(polygon2.points[p], polygon2.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1) + (normal.x() * x)
+					+ (normal.y() * dec_var_Y1) + (normal.y() * y)
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (dec_var_T1 < dec_var_T2) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+	
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_ShiftConsequentialPointOutsidePolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     int                    x,
+						     int                    y,
+						     const z3::expr        &dec_var_X1,
+						     const z3::expr        &dec_var_Y1,
+						     const z3::expr        &dec_var_T1,
+						     const z3::expr        &dec_var_X2,
+						     const z3::expr        &dec_var_Y2,
+						     const z3::expr        &dec_var_T2,
+						     const Slic3r::Polygon &polygon2)
+{
+    if (polygon2.points.size() >= 3)
+    {    
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon2.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon2.points.size();
+	    
+	    Line line(polygon2.points[p], polygon2.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1) + (normal.x() * x)
+					+ (normal.y() * dec_var_Y1) + (normal.y() * y)
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (dec_var_T1 < 0) || (dec_var_T2 < 0) || (dec_var_T1 < dec_var_T2) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+	
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_FixedPointOutsidePolygon(z3::solver            &Solver,
+					z3::context           &Context,
+					const Rational        &dec_value_X1,
+					const Rational        &dec_value_Y1,					
+					const z3::expr        &dec_var_X2,
+					const z3::expr        &dec_var_Y2,
+					const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {   
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon.points.size();
+	    
+	    Line line(polygon.points[p], polygon.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * Context.real_val(dec_value_X1.numerator, dec_value_X1.denominator))
+					+ (normal.y() * Context.real_val(dec_value_Y1.numerator, dec_value_Y1.denominator))
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_SequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const Rational        &dec_value_X1,
+						  const Rational        &dec_value_Y1,
+						  const Rational        &dec_value_T1,
+						  const z3::expr        &dec_var_X2,
+						  const z3::expr        &dec_var_Y2,
+						  const z3::expr        &dec_var_T2,
+						  const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon.points.size();
+	    
+	    Line line(polygon.points[p], polygon.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * Context.real_val(dec_value_X1.numerator, dec_value_X1.denominator))
+					+ (normal.y() * Context.real_val(dec_value_Y1.numerator, dec_value_Y1.denominator))
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (Context.real_val(dec_value_T1.numerator, dec_value_T1.denominator) <  dec_var_T2) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+	
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_SequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const Rational        &dec_value_X1,
+						  const Rational        &dec_value_Y1,
+						  const z3::expr        &dec_var_T1,
+						  const z3::expr        &dec_var_X2,
+						  const z3::expr        &dec_var_Y2,
+						  const Rational        &dec_value_T2,
+						  const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {   
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon.points.size();    
+	    Line line(polygon.points[p], polygon.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * Context.real_val(dec_value_X1.numerator, dec_value_X1.denominator))
+					+ (normal.y() * Context.real_val(dec_value_Y1.numerator, dec_value_Y1.denominator))
+					- (normal.x() * dec_var_X2)
+					- (normal.x() * line.a.x())
+					- (normal.y() * dec_var_Y2)
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (dec_var_T1 < Context.real_val(dec_value_T2.numerator, dec_value_T2.denominator)) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+	
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_ConsequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const Rational        &dec_value_X1,
+						     const Rational        &dec_value_Y1,
+						     const Rational        &dec_value_T1,
+						     const z3::expr        &dec_var_X2,
+						     const z3::expr        &dec_var_Y2,
+						     const z3::expr        &dec_var_T2,
+						     const Slic3r::Polygon &polygon)
+{
+    if (dec_value_T1.is_Positive())
+    {
+	if (polygon.points.size() >= 3)
+	{
+	    z3::expr out_disjunction(Context);
+	    
+	    for (int p = 0; p < polygon.points.size(); ++p)
+	    {
+		int np = (p + 1) % polygon.points.size();
+		
+		Line line(polygon.points[p], polygon.points[np]);
+		Vector normal = line.normal();
+		
+		z3::expr outside_half_plane(  (normal.x() * Context.real_val(dec_value_X1.numerator, dec_value_X1.denominator))
+					    + (normal.y() * Context.real_val(dec_value_Y1.numerator, dec_value_Y1.denominator))
+					    - (normal.x() * dec_var_X2)
+					    - (normal.x() * line.a.x())
+					    - (normal.y() * dec_var_Y2)
+					    - (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+		if (p == 0)
+		{
+		    out_disjunction = (dec_var_T2 < 0) || (Context.real_val(dec_value_T1.numerator, dec_value_T1.denominator) <  dec_var_T2) || outside_half_plane;
+		}
+		else
+		{
+		    out_disjunction = out_disjunction || outside_half_plane;
+		}
+	    }
+	    
+	    Solver.add(out_disjunction);
+	}
+    }
+}
+
+
+void introduce_ConsequentialFixedPointOutsidePolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const Rational        &dec_value_X1,
+						     const Rational        &dec_value_Y1,
+						     const z3::expr        &dec_var_T1,
+						     const z3::expr        &dec_var_X2,
+						     const z3::expr        &dec_var_Y2,
+						     const Rational        &dec_value_T2,
+						     const Slic3r::Polygon &polygon)
+{
+    if (dec_value_T2.is_Positive())
+    {
+	if (polygon.points.size() >= 3)
+	{   
+	    z3::expr out_disjunction(Context);
+	    
+	    for (int p = 0; p < polygon.points.size(); ++p)
+	    {
+		int np = (p + 1) % polygon.points.size();    
+		Line line(polygon.points[p], polygon.points[np]);
+		Vector normal = line.normal();
+		
+		z3::expr outside_half_plane(  (normal.x() * Context.real_val(dec_value_X1.numerator, dec_value_X1.denominator))
+					    + (normal.y() * Context.real_val(dec_value_Y1.numerator, dec_value_Y1.denominator))
+					    - (normal.x() * dec_var_X2)
+					    - (normal.x() * line.a.x())
+					    - (normal.y() * dec_var_Y2)
+					    - (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+		if (p == 0)
+		{
+		    out_disjunction = (dec_var_T1 < 0) || (dec_var_T1 < Context.real_val(dec_value_T2.numerator, dec_value_T2.denominator)) || outside_half_plane;
+		}
+		else
+		{
+		    out_disjunction = out_disjunction || outside_half_plane;
+		}
+	    }
+	
+	    Solver.add(out_disjunction);
+	}
+    }
+}
+
+
+void introduce_PointOutsideFixedPolygon(z3::solver            &Solver,
+					z3::context           &Context,
+					const z3::expr        &dec_var_X1,
+					const z3::expr        &dec_var_Y1,
+					const Rational        &dec_value_X2,
+					const Rational        &dec_value_Y2,
+					const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {    
+	z3::expr out_disjunction(Context);
+
+	for (int p = 0; p < polygon.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon.points.size();
+	    
+	    Line line(polygon.points[p], polygon.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+					+ (normal.y() * dec_var_Y1)		 
+					- (normal.x() * Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator))
+					- (normal.x() * line.a.x())
+					- (normal.y() * Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator))
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+	
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_SequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const z3::expr        &dec_var_X1,
+						  const z3::expr        &dec_var_Y1,
+						  const z3::expr        &dec_var_T1,
+						  const Rational        &dec_value_X2,
+						  const Rational        &dec_value_Y2,
+						  const Rational        &dec_value_T2,
+						  const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {   
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon.points.size();
+	    
+	    Line line(polygon.points[p], polygon.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+					+ (normal.y() * dec_var_Y1)		 
+					- (normal.x() * Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator))
+					- (normal.x() * line.a.x())
+					- (normal.y() * Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator))
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (dec_var_T1 < Context.real_val(dec_value_T2.numerator, dec_value_T2.denominator)) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+	
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_SequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						  z3::context           &Context,
+						  const z3::expr        &dec_var_X1,
+						  const z3::expr        &dec_var_Y1,
+						  const Rational        &dec_value_T1,
+						  const Rational        &dec_value_X2,
+						  const Rational        &dec_value_Y2,
+						  const z3::expr        &dec_var_T2,
+						  const Slic3r::Polygon &polygon)
+{
+    if (polygon.points.size() >= 3)
+    {    
+	z3::expr out_disjunction(Context);
+	
+	for (int p = 0; p < polygon.points.size(); ++p)
+	{
+	    int np = (p + 1) % polygon.points.size();
+	    
+	    Line line(polygon.points[p], polygon.points[np]);
+	    Vector normal = line.normal();
+	    
+	    z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+					+ (normal.y() * dec_var_Y1)		 
+					- (normal.x() * Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator))
+					- (normal.x() * line.a.x())
+					- (normal.y() * Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator))
+					- (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+	    if (p == 0)
+	    {
+		out_disjunction = (Context.real_val(dec_value_T1.numerator, dec_value_T1.denominator) <  dec_var_T2) || outside_half_plane;
+	    }
+	    else
+	    {
+		out_disjunction = out_disjunction || outside_half_plane;
+	    }
+	}
+
+	Solver.add(out_disjunction);
+    }
+}
+
+
+void introduce_ConsequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const z3::expr        &dec_var_X1,
+						     const z3::expr        &dec_var_Y1,
+						     const z3::expr        &dec_var_T1,
+						     const Rational        &dec_value_X2,
+						     const Rational        &dec_value_Y2,
+						     const Rational        &dec_value_T2,
+						     const Slic3r::Polygon &polygon)
+{
+    if (dec_value_T2.is_Positive())
+    {
+	if (polygon.points.size() >= 3)
+	{   
+	    z3::expr out_disjunction(Context);
+	    
+	    for (int p = 0; p < polygon.points.size(); ++p)
+	    {
+		int np = (p + 1) % polygon.points.size();
+		
+		Line line(polygon.points[p], polygon.points[np]);
+		Vector normal = line.normal();
+		
+		z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+					    + (normal.y() * dec_var_Y1)		 
+					    - (normal.x() * Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator))
+					    - (normal.x() * line.a.x())
+					    - (normal.y() * Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator))
+					    - (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+		if (p == 0)
+		{
+		    out_disjunction = (dec_var_T1 < 0) || (dec_var_T1 < Context.real_val(dec_value_T2.numerator, dec_value_T2.denominator)) || outside_half_plane;
+		}
+		else
+		{
+		    out_disjunction = out_disjunction || outside_half_plane;
+		}
+	    }
+	    
+	    Solver.add(out_disjunction);
+	}
+    }
+}
+
+
+void introduce_ConsequentialPointOutsideFixedPolygon(z3::solver            &Solver,
+						     z3::context           &Context,
+						     const z3::expr        &dec_var_X1,
+						     const z3::expr        &dec_var_Y1,
+						     const Rational        &dec_value_T1,
+						     const Rational        &dec_value_X2,
+						     const Rational        &dec_value_Y2,
+						     const z3::expr        &dec_var_T2,
+						     const Slic3r::Polygon &polygon)
+{
+    if (dec_value_T1.is_Positive())
+    {
+	if (polygon.points.size() >= 3)
+	{    
+	    z3::expr out_disjunction(Context);
+	    
+	    for (int p = 0; p < polygon.points.size(); ++p)
+	    {
+		int np = (p + 1) % polygon.points.size();
+		
+		Line line(polygon.points[p], polygon.points[np]);
+		Vector normal = line.normal();
+		
+		z3::expr outside_half_plane(  (normal.x() * dec_var_X1)
+					    + (normal.y() * dec_var_Y1)		 
+					    - (normal.x() * Context.real_val(dec_value_X2.numerator, dec_value_X2.denominator))
+					    - (normal.x() * line.a.x())
+					    - (normal.y() * Context.real_val(dec_value_Y2.numerator, dec_value_Y2.denominator))
+					    - (normal.y() * line.a.y()) > 0/*Context.real_val("0")*/);
+	    
+		if (p == 0)
+		{
+		    out_disjunction = (dec_var_T2 < 0) || (Context.real_val(dec_value_T1.numerator, dec_value_T1.denominator) <  dec_var_T2) || outside_half_plane;
+		}
+		else
+		{
+		    out_disjunction = out_disjunction || outside_half_plane;
+		}
+	    }
+	    
+	    Solver.add(out_disjunction);
+	}
+    }
+}
+
+void introduce_PolygonLineNonIntersection(z3::solver            &Solver,
+					  z3::context           &Context,
+					  const z3::expr        &dec_var_X1,
+					  const z3::expr        &dec_var_Y1,
+					  const Slic3r::Polygon &polygon1,
+					  const z3::expr        &dec_var_X2,
+					  const z3::expr        &dec_var_Y2,
+					  const Slic3r::Polygon &polygon2)
+{
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+	const Point &next_point1 = polygon1.points[(p1 + 1) % polygon1.points.size()];
+
+	for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+	{
+	    const Point &point2 = polygon2.points[p2];
+	    const Point &next_point2 = polygon2.points[(p2 + 1) % polygon2.points.size()];
+
+	    introduce_LineNonIntersection(Solver,
+					  Context,
+					  dec_var_X1,
+					  dec_var_Y1,
+					  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+					  Line(point1, next_point1),
+					  dec_var_X2,
+					  dec_var_Y2,
+					  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+					  Line(point2, next_point2));
+	}
+    }
+}
+
+
+void introduce_PolygonOutsidePolygon(z3::solver            &Solver,
+				     z3::context           &Context,				     
+				     const z3::expr        &dec_var_X1,
+				     const z3::expr        &dec_var_Y1,
+				     const Slic3r::Polygon &polygon1,
+				     const z3::expr        &dec_var_X2,
+				     const z3::expr        &dec_var_Y2,
+				     const Slic3r::Polygon &polygon2)
+{
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	introduce_PointOutsidePolygon(Solver,
+				      Context,
+				      dec_var_X1 + point1.x(),
+				      dec_var_Y1 + point1.y(),
+				      dec_var_X2,
+				      dec_var_Y2,
+				      polygon2);
+    }
+
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	introduce_PointOutsidePolygon(Solver,
+				      Context,
+				      dec_var_X2 + point2.x(),
+				      dec_var_Y2 + point2.y(),
+				      dec_var_X1,
+				      dec_var_Y1,
+				      polygon1);
+    }
+}
+
+
+void introduce_PolygonOutsideFixedPolygon(z3::solver            &Solver,
+					  z3::context           &Context,				     
+					  const z3::expr        &dec_var_X1,
+					  const z3::expr        &dec_var_Y1,
+					  const Slic3r::Polygon &polygon1,
+					  const Rational        &dec_value_X2,
+					  const Rational        &dec_value_Y2,				     
+					  const Slic3r::Polygon &polygon2)
+{
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	introduce_PointOutsideFixedPolygon(Solver,
+					   Context,
+					   dec_var_X1 + point1.x(),
+					   dec_var_Y1 + point1.y(),
+					   dec_value_X2,
+					   dec_value_Y2,
+					   polygon2);
+    }
+
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	introduce_FixedPointOutsidePolygon(Solver,
+					   Context,
+					   dec_value_X2 + point2.x(),
+					   dec_value_Y2 + point2.y(),
+					   dec_var_X1,
+					   dec_var_Y1,
+					   polygon1);
+    }
+}
+
+
+void introduce_SequentialPolygonOutsidePolygon(z3::solver            &Solver,
+					       z3::context           &Context,				     
+					       const z3::expr        &dec_var_X1,
+					       const z3::expr        &dec_var_Y1,
+					       const z3::expr        &dec_var_T1,
+					       const Slic3r::Polygon &polygon1,
+					       const Slic3r::Polygon &unreachable_polygon1,
+					       const z3::expr        &dec_var_X2,
+					       const z3::expr        &dec_var_Y2,
+					       const z3::expr        &dec_var_T2,
+					       const Slic3r::Polygon &polygon2,
+					       const Slic3r::Polygon &unreachable_polygon2)
+{
+    std::vector<Slic3r::Polygon> _unreachable_polygons1;
+    _unreachable_polygons1.push_back(unreachable_polygon1);
+
+    std::vector<Slic3r::Polygon> _unreachable_polygons2;
+    _unreachable_polygons2.push_back(unreachable_polygon2);
+
+    introduce_SequentialPolygonOutsidePolygon(Solver,
+					      Context,
+					      dec_var_X1,
+					      dec_var_Y1,
+					      dec_var_T1,
+					      polygon1,
+					      _unreachable_polygons1,
+					      dec_var_X2,
+					      dec_var_Y2,
+					      dec_var_T2,
+					      polygon2,
+					      _unreachable_polygons2);
+}
+
+
+void introduce_SequentialPolygonOutsidePolygon(z3::solver                         &Solver,
+					       z3::context                        &Context,
+					       const z3::expr                     &dec_var_X1,
+					       const z3::expr                     &dec_var_Y1,
+					       const z3::expr                     &dec_var_T1,
+					       const Slic3r::Polygon              &polygon1,
+					       const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+					       const z3::expr                     &dec_var_X2,
+					       const z3::expr                     &dec_var_Y2,
+					       const z3::expr                     &dec_var_T2,
+					       const Slic3r::Polygon              &polygon2,
+					       const std::vector<Slic3r::Polygon> &unreachable_polygons2)
+{
+//    Solver.add(dec_var_T1 < dec_var_T2);
+
+    #ifdef DEBUG
+    {
+	printf("polygon1:\n");
+	for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+	{
+	    printf("[%d,%d] ", polygon1.points[p1].x(), polygon1.points[p1].y());
+	}
+	printf("\n");
+
+	for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+	{
+	    printf("pro_polygon1 %d:\n", poly1);
+	    for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	    {
+		printf("[%d,%d] ", unreachable_polygons1[poly1].points[p1].x(), unreachable_polygons1[poly1].points[p1].y());
+	    }
+	    printf("\n");
+	}
+	printf("\n");    
+
+	printf("polygon2:\n");
+	for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+	{
+	    printf("[%d,%d] ", polygon2.points[p2].x(), polygon2.points[p2].y());
+	}
+	printf("\n");
+    
+	for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+	{
+	    printf("pro_polygon2 %d:\n", poly2);
+	    for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	    {
+		printf("[%d,%d] ", unreachable_polygons2[poly2].points[p2].x(), unreachable_polygons2[poly2].points[p2].y());
+	    }
+	    printf("\n");
+	}    
+	printf("\n");
+    }
+    #endif
+
+    
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+	{
+	    introduce_SequentialPointOutsidePolygon(Solver,
+						    Context,
+						    dec_var_X1 + point1.x(),
+						    dec_var_Y1 + point1.y(),
+						    dec_var_T1,
+						    dec_var_X2,
+						    dec_var_Y2,
+					  	    dec_var_T2,
+						    unreachable_polygons2[poly2]);
+	}
+    }
+    
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	{
+	    const Point &pro_point2 = unreachable_polygons2[poly2].points[p2];
+
+	    introduce_SequentialPointOutsidePolygon(Solver,
+						    Context,
+						    dec_var_X2 + pro_point2.x(),
+						    dec_var_Y2 + pro_point2.y(),
+						    dec_var_T1,
+						    dec_var_X1,
+						    dec_var_Y1,
+						    dec_var_T2,
+						    polygon1);	
+	}
+    }
+
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+	{
+	    /*
+	    introduce_ShiftSequentialPointOutsidePolygon(Solver,
+							 Context,
+							 point2.x(),
+							 point2.y(),
+							 dec_var_X2,
+							 dec_var_Y2,
+							 dec_var_T2,				      
+							 dec_var_X1,
+							 dec_var_Y1,
+							 dec_var_T1,
+							 polygon1);						    
+							 unreachable_polygons1[poly1]);	    
+	    */ 
+	    introduce_SequentialPointOutsidePolygon(Solver,
+						    Context,
+						    dec_var_X2 + point2.x(),
+						    dec_var_Y2 + point2.y(),
+						    dec_var_T2,				      
+						    dec_var_X1,
+						    dec_var_Y1,
+						    dec_var_T1,
+						    unreachable_polygons1[poly1]);
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	{
+	    const Point &pro_point1 = unreachable_polygons1[poly1].points[p1];
+
+	    introduce_SequentialPointOutsidePolygon(Solver,
+						    Context,
+						    dec_var_X1 + pro_point1.x(),
+						    dec_var_Y1 + pro_point1.y(),
+						    dec_var_T2,
+						    dec_var_X2,
+						    dec_var_Y2,
+						    dec_var_T1,
+						    polygon2);
+	}
+    }
+/*
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	introduce_PointOutsidePolygon(Solver,
+				      Context,
+				      dec_var_X1 + point1.x(),
+				      dec_var_Y1 + point1.y(),
+				      dec_var_X2,
+				      dec_var_Y2,
+				      polygon2);
+    }
+*/
+/*  
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	introduce_PointOutsidePolygon(Solver,
+				      Context,
+				      dec_var_X2 + point2.x(),
+				      dec_var_Y2 + point2.y(),
+				      dec_var_X1,
+				      dec_var_Y1,
+				      polygon1);
+    }
+*/
+}
+
+
+
+void introduce_SequentialPolygonOutsideFixedPolygon(z3::solver            &Solver,
+						    z3::context           &Context,
+						    const z3::expr        &dec_var_X1,
+						    const z3::expr        &dec_var_Y1,
+						    const z3::expr        &dec_var_T1,
+						    const Slic3r::Polygon &polygon1,
+						    const Slic3r::Polygon &unreachable_polygon1,
+						    const Rational        &dec_value_X2,
+						    const Rational        &dec_value_Y2,
+						    const Rational        &dec_value_T2,
+						    const Slic3r::Polygon &polygon2,
+						    const Slic3r::Polygon &unreachable_polygon2)
+{
+    std::vector<Slic3r::Polygon> _unreachable_polygons1;
+    _unreachable_polygons1.push_back(unreachable_polygon1);
+
+    std::vector<Slic3r::Polygon> _unreachable_polygons2;
+    _unreachable_polygons2.push_back(unreachable_polygon2);
+
+    introduce_SequentialPolygonOutsideFixedPolygon(Solver,
+						   Context,
+						   dec_var_X1,
+						   dec_var_Y1,
+						   dec_var_T1,
+						   polygon1,
+						   _unreachable_polygons1,
+						   dec_value_X2,
+						   dec_value_Y2,
+						   dec_value_T2,
+						   polygon2,
+						   _unreachable_polygons2);
+}
+
+
+void introduce_SequentialPolygonOutsideFixedPolygon(z3::solver                         &Solver,
+						    z3::context                        &Context,
+						    const z3::expr                     &dec_var_X1,
+						    const z3::expr                     &dec_var_Y1,
+						    const z3::expr                     &dec_var_T1,
+						    const Slic3r::Polygon              &polygon1,
+						    const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						    const Rational                     &dec_value_X2,
+						    const Rational                     &dec_value_Y2,
+						    const Rational                     &dec_value_T2,
+						    const Slic3r::Polygon              &polygon2,
+						    const std::vector<Slic3r::Polygon> &unreachable_polygons2)
+{
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+	{
+	    introduce_SequentialPointOutsideFixedPolygon(Solver,
+							 Context,
+							 dec_var_X1 + point1.x(),
+							 dec_var_Y1 + point1.y(),
+							 dec_var_T1,
+							 dec_value_X2,
+							 dec_value_Y2,
+							 dec_value_T2,				      
+							 unreachable_polygons2[poly2]);
+	}
+    }
+
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	{
+	    const Point &pro_point2 = unreachable_polygons2[poly2].points[p2];
+
+	    introduce_SequentialFixedPointOutsidePolygon(Solver,
+							 Context,
+							 dec_value_X2 + pro_point2.x(),
+							 dec_value_Y2 + pro_point2.y(),
+							 dec_var_T1,
+							 dec_var_X1,
+							 dec_var_Y1,
+							 dec_value_T2,
+							 polygon1);	
+	}
+    }
+
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+	{
+	    introduce_SequentialFixedPointOutsidePolygon(Solver,
+							 Context,
+							 dec_value_X2 + point2.x(),
+							 dec_value_Y2 + point2.y(),
+							 dec_value_T2,				      
+							 dec_var_X1,
+							 dec_var_Y1,
+							 dec_var_T1,
+							 unreachable_polygons1[poly1]);
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	{
+	    const Point &pro_point1 = unreachable_polygons1[poly1].points[p1];
+
+	    introduce_SequentialPointOutsideFixedPolygon(Solver,
+							 Context,
+							 dec_var_X1 + pro_point1.x(),
+							 dec_var_Y1 + pro_point1.y(),
+							 dec_value_T2,				      
+							 dec_value_X2,
+							 dec_value_Y2,
+							 dec_var_T1,
+							 polygon2);
+	}
+    }
+
+/*
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	introduce_PointOutsideFixedPolygon(Solver,
+					   Context,
+					   dec_var_X1 + point1.x(),
+					   dec_var_Y1 + point1.y(),
+					   dec_value_X2,
+					   dec_value_Y2,
+					   polygon2);
+    }
+ 
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	printf("c: %.3f, %.3f\n", dec_value_X2.as_double(), dec_value_Y2.as_double());
+	printf("   %.3f, %.3f\n", (dec_value_X2 + point2.x()).as_double(), (dec_value_Y2 + point2.y()).as_double());
+
+	introduce_FixedPointOutsidePolygon(Solver,
+					   Context,
+					   dec_value_X2 + point2.x(),
+					   dec_value_Y2 + point2.y(),
+					   dec_var_X1,
+					   dec_var_Y1,
+					   polygon1);
+    }
+*/
+}
+
+
+void introduce_ConsequentialPolygonOutsidePolygon(z3::solver            &Solver,
+						  z3::context           &Context,				     
+						  const z3::expr        &dec_var_X1,
+						  const z3::expr        &dec_var_Y1,
+						  const z3::expr        &dec_var_T1,
+						  const Slic3r::Polygon &polygon1,
+						  const Slic3r::Polygon &unreachable_polygon1,
+						  const z3::expr        &dec_var_X2,
+						  const z3::expr        &dec_var_Y2,
+						  const z3::expr        &dec_var_T2,
+						  const Slic3r::Polygon &polygon2,
+						  const Slic3r::Polygon &unreachable_polygon2)
+{
+    std::vector<Slic3r::Polygon> _unreachable_polygons1;
+    _unreachable_polygons1.push_back(unreachable_polygon1);
+
+    std::vector<Slic3r::Polygon> _unreachable_polygons2;
+    _unreachable_polygons2.push_back(unreachable_polygon2);
+
+    introduce_ConsequentialPolygonOutsidePolygon(Solver,
+						 Context,
+						 dec_var_X1,
+						 dec_var_Y1,
+						 dec_var_T1,
+						 polygon1,
+						 _unreachable_polygons1,
+						 dec_var_X2,
+						 dec_var_Y2,
+						 dec_var_T2,
+						 polygon2,
+						 _unreachable_polygons2);
+}
+
+
+void introduce_ConsequentialPolygonOutsidePolygon(z3::solver                         &Solver,
+						  z3::context                        &Context,
+						  const z3::expr                     &dec_var_X1,
+						  const z3::expr                     &dec_var_Y1,
+						  const z3::expr                     &dec_var_T1,
+						  const Slic3r::Polygon              &polygon1,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						  const z3::expr                     &dec_var_X2,
+						  const z3::expr                     &dec_var_Y2,
+						  const z3::expr                     &dec_var_T2,
+						  const Slic3r::Polygon              &polygon2,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons2)
+{
+    #ifdef DEBUG
+    {
+	printf("polygon1:\n");
+	for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+	{
+	    printf("[%d,%d] ", polygon1.points[p1].x(), polygon1.points[p1].y());
+	}
+	printf("\n");
+
+	for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+	{
+	    printf("pro_polygon1 %d:\n", poly1);
+	    for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	    {
+		printf("[%d,%d] ", unreachable_polygons1[poly1].points[p1].x(), unreachable_polygons1[poly1].points[p1].y());
+	    }
+	    printf("\n");
+	}
+	printf("\n");    
+
+	printf("polygon2:\n");
+	for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+	{
+	    printf("[%d,%d] ", polygon2.points[p2].x(), polygon2.points[p2].y());
+	}
+	printf("\n");
+    
+	for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+	{
+	    printf("pro_polygon2 %d:\n", poly2);
+	    for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	    {
+		printf("[%d,%d] ", unreachable_polygons2[poly2].points[p2].x(), unreachable_polygons2[poly2].points[p2].y());
+	    }
+	    printf("\n");
+	}    
+	printf("\n");
+    }
+    #endif
+
+    
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+	{
+	    introduce_ConsequentialPointOutsidePolygon(Solver,
+						       Context,
+						       dec_var_X1 + point1.x(),
+						       dec_var_Y1 + point1.y(),
+						       dec_var_T1,
+						       dec_var_X2,
+						       dec_var_Y2,
+						       dec_var_T2,
+						       unreachable_polygons2[poly2]);
+	}
+    }
+    
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	{
+	    const Point &pro_point2 = unreachable_polygons2[poly2].points[p2];
+
+	    introduce_ConsequentialPointOutsidePolygon(Solver,
+						       Context,
+						       dec_var_X2 + pro_point2.x(),
+						       dec_var_Y2 + pro_point2.y(),
+						       dec_var_T1,
+						       dec_var_X1,
+						       dec_var_Y1,
+						       dec_var_T2,
+						       polygon1);	
+	}
+    }
+
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+	{
+	    introduce_ConsequentialPointOutsidePolygon(Solver,
+						       Context,
+						       dec_var_X2 + point2.x(),
+						       dec_var_Y2 + point2.y(),
+						       dec_var_T2,				      
+						       dec_var_X1,
+						       dec_var_Y1,
+						       dec_var_T1,
+						       unreachable_polygons1[poly1]);
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	{
+	    const Point &pro_point1 = unreachable_polygons1[poly1].points[p1];
+
+	    introduce_ConsequentialPointOutsidePolygon(Solver,
+						       Context,
+						       dec_var_X1 + pro_point1.x(),
+						       dec_var_Y1 + pro_point1.y(),
+						       dec_var_T2,
+						       dec_var_X2,
+						       dec_var_Y2,
+						       dec_var_T1,
+						       polygon2);
+	}
+    }
+}
+
+
+void introduce_ConsequentialPolygonExternalPolygon(z3::solver            &Solver,
+						   z3::context           &Context,				     
+						   const z3::expr        &dec_var_X1,
+						   const z3::expr        &dec_var_Y1,
+						   const z3::expr        &dec_var_T1,
+						   const Slic3r::Polygon &polygon1,
+						   const Slic3r::Polygon &unreachable_polygon1,
+						   const z3::expr        &dec_var_X2,
+						   const z3::expr        &dec_var_Y2,
+						   const z3::expr        &dec_var_T2,
+						   const Slic3r::Polygon &polygon2,
+						   const Slic3r::Polygon &unreachable_polygon2)
+{
+    std::vector<Slic3r::Polygon> _unreachable_polygons1;
+    _unreachable_polygons1.push_back(unreachable_polygon1);
+
+    std::vector<Slic3r::Polygon> _unreachable_polygons2;
+    _unreachable_polygons2.push_back(unreachable_polygon2);
+
+    introduce_ConsequentialPolygonExternalPolygon(Solver,
+						  Context,
+						  dec_var_X1,
+						  dec_var_Y1,
+						  dec_var_T1,
+						  polygon1,
+						  _unreachable_polygons1,
+						  dec_var_X2,
+						  dec_var_Y2,
+						  dec_var_T2,
+						  polygon2,
+						  _unreachable_polygons2);
+}
+
+
+void introduce_ConsequentialPolygonExternalPolygon(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr                     &dec_var_X1,
+						   const z3::expr                     &dec_var_Y1,
+						   const z3::expr                     &dec_var_T1,
+						   const Slic3r::Polygon              &polygon1,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						   const z3::expr                     &dec_var_X2,
+						   const z3::expr                     &dec_var_Y2,
+						   const z3::expr                     &dec_var_T2,
+						   const Slic3r::Polygon              &polygon2,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons2)
+{
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	if (unreachable_polygons2[poly2].area() > polygon1.area())
+	{	    
+	    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+	    {
+		const Point &point1 = polygon1.points[p1];
+		
+		introduce_ConsequentialPointOutsidePolygon(Solver,
+							   Context,
+							   dec_var_X1 + point1.x(),
+							   dec_var_Y1 + point1.y(),
+							   dec_var_T1,
+							   dec_var_X2,
+							   dec_var_Y2,
+							   dec_var_T2,
+							   unreachable_polygons2[poly2]);
+	    }
+	}
+    }
+    
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	if (unreachable_polygons2[poly2].area() < polygon1.area())
+	{	    	    	
+	    for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	    {
+		const Point &pro_point2 = unreachable_polygons2[poly2].points[p2];
+		
+		introduce_ConsequentialPointOutsidePolygon(Solver,
+							   Context,
+							   dec_var_X2 + pro_point2.x(),
+							   dec_var_Y2 + pro_point2.y(),
+							   dec_var_T1,
+							   dec_var_X1,
+							   dec_var_Y1,
+							   dec_var_T2,
+							   polygon1);	
+	    }
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	if (unreachable_polygons1[poly1].area() > polygon2.area())
+	{	    	    		    	    
+	    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+	    {
+		const Point &point2 = polygon2.points[p2];
+		
+		introduce_ConsequentialPointOutsidePolygon(Solver,
+							   Context,
+							   dec_var_X2 + point2.x(),
+							   dec_var_Y2 + point2.y(),
+							   dec_var_T2,				      
+							   dec_var_X1,
+							   dec_var_Y1,
+							   dec_var_T1,
+							   unreachable_polygons1[poly1]);
+	    }
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	if (unreachable_polygons1[poly1].area() < polygon2.area())
+	{	    	    		    	    	
+	    for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	    {
+		const Point &pro_point1 = unreachable_polygons1[poly1].points[p1];
+		
+		introduce_ConsequentialPointOutsidePolygon(Solver,
+							   Context,
+							   dec_var_X1 + pro_point1.x(),
+							   dec_var_Y1 + pro_point1.y(),
+							   dec_var_T2,
+							   dec_var_X2,
+							   dec_var_Y2,
+							   dec_var_T1,
+							   polygon2);
+	    }
+	}
+    }
+}
+
+
+void introduce_ConsequentialPolygonOutsideFixedPolygon(z3::solver            &Solver,
+						       z3::context           &Context,
+						       const z3::expr        &dec_var_X1,
+						       const z3::expr        &dec_var_Y1,
+						       const z3::expr        &dec_var_T1,
+						       const Slic3r::Polygon &polygon1,
+						       const Slic3r::Polygon &unreachable_polygon1,
+						       const Rational        &dec_value_X2,
+						       const Rational        &dec_value_Y2,
+						       const Rational        &dec_value_T2,
+						       const Slic3r::Polygon &polygon2,
+						       const Slic3r::Polygon &unreachable_polygon2)
+{
+    std::vector<Slic3r::Polygon> _unreachable_polygons1;
+    _unreachable_polygons1.push_back(unreachable_polygon1);
+
+    std::vector<Slic3r::Polygon> _unreachable_polygons2;
+    _unreachable_polygons2.push_back(unreachable_polygon2);
+
+    introduce_ConsequentialPolygonOutsideFixedPolygon(Solver,
+						      Context,
+						      dec_var_X1,
+						      dec_var_Y1,
+						      dec_var_T1,
+						      polygon1,
+						      _unreachable_polygons1,
+						      dec_value_X2,
+						      dec_value_Y2,
+						      dec_value_T2,
+						      polygon2,
+						      _unreachable_polygons2);
+}
+
+
+void introduce_ConsequentialPolygonOutsideFixedPolygon(z3::solver                         &Solver,
+						       z3::context                        &Context,
+						       const z3::expr                     &dec_var_X1,
+						       const z3::expr                     &dec_var_Y1,
+						       const z3::expr                     &dec_var_T1,
+						       const Slic3r::Polygon              &polygon1,
+						       const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+						       const Rational                     &dec_value_X2,
+						       const Rational                     &dec_value_Y2,
+						       const Rational                     &dec_value_T2,
+						       const Slic3r::Polygon              &polygon2,
+						       const std::vector<Slic3r::Polygon> &unreachable_polygons2)
+{
+    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+    {
+	const Point &point1 = polygon1.points[p1];
+
+	for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+	{
+	    introduce_ConsequentialPointOutsideFixedPolygon(Solver,
+							    Context,
+							    dec_var_X1 + point1.x(),
+							    dec_var_Y1 + point1.y(),
+							    dec_var_T1,
+							    dec_value_X2,
+							    dec_value_Y2,
+							    dec_value_T2,				      
+							    unreachable_polygons2[poly2]);
+	}
+    }
+
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	{
+	    const Point &pro_point2 = unreachable_polygons2[poly2].points[p2];
+
+	    introduce_ConsequentialFixedPointOutsidePolygon(Solver,
+							    Context,
+							    dec_value_X2 + pro_point2.x(),
+							    dec_value_Y2 + pro_point2.y(),
+							    dec_var_T1,
+							    dec_var_X1,
+							    dec_var_Y1,
+							    dec_value_T2,
+							    polygon1);	
+	}
+    }
+
+    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+    {
+	const Point &point2 = polygon2.points[p2];
+
+	for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+	{
+	    introduce_ConsequentialFixedPointOutsidePolygon(Solver,
+							    Context,
+							    dec_value_X2 + point2.x(),
+							    dec_value_Y2 + point2.y(),
+							    dec_value_T2,				      
+							    dec_var_X1,
+							    dec_var_Y1,
+							    dec_var_T1,
+							    unreachable_polygons1[poly1]);
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	{
+	    const Point &pro_point1 = unreachable_polygons1[poly1].points[p1];
+
+	    introduce_ConsequentialPointOutsideFixedPolygon(Solver,
+							    Context,
+							    dec_var_X1 + pro_point1.x(),
+							    dec_var_Y1 + pro_point1.y(),
+							    dec_value_T2,				      
+							    dec_value_X2,
+							    dec_value_Y2,
+							    dec_var_T1,
+							    polygon2);
+	}
+    }
+}
+
+
+
+void introduce_ConsequentialPolygonExternalFixedPolygon(z3::solver            &Solver,
+							z3::context           &Context,
+							const z3::expr        &dec_var_X1,
+							const z3::expr        &dec_var_Y1,
+							const z3::expr        &dec_var_T1,
+							const Slic3r::Polygon &polygon1,
+							const Slic3r::Polygon &unreachable_polygon1,
+							const Rational        &dec_value_X2,
+							const Rational        &dec_value_Y2,
+							const Rational        &dec_value_T2,
+							const Slic3r::Polygon &polygon2,
+							const Slic3r::Polygon &unreachable_polygon2)
+{
+    std::vector<Slic3r::Polygon> _unreachable_polygons1;
+    _unreachable_polygons1.push_back(unreachable_polygon1);
+
+    std::vector<Slic3r::Polygon> _unreachable_polygons2;
+    _unreachable_polygons2.push_back(unreachable_polygon2);
+
+    introduce_ConsequentialPolygonExternalFixedPolygon(Solver,
+						       Context,
+						       dec_var_X1,
+						       dec_var_Y1,
+						       dec_var_T1,
+						       polygon1,
+						       _unreachable_polygons1,
+						       dec_value_X2,
+						       dec_value_Y2,
+						       dec_value_T2,
+						       polygon2,
+						       _unreachable_polygons2);
+}
+
+
+void introduce_ConsequentialPolygonExternalFixedPolygon(z3::solver                         &Solver,
+							z3::context                        &Context,
+							const z3::expr                     &dec_var_X1,
+							const z3::expr                     &dec_var_Y1,
+							const z3::expr                     &dec_var_T1,
+							const Slic3r::Polygon              &polygon1,
+							const std::vector<Slic3r::Polygon> &unreachable_polygons1,
+							const Rational                     &dec_value_X2,
+							const Rational                     &dec_value_Y2,
+							const Rational                     &dec_value_T2,
+							const Slic3r::Polygon              &polygon2,
+							const std::vector<Slic3r::Polygon> &unreachable_polygons2)
+{
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	if (unreachable_polygons2[poly2].area() > polygon1.area())
+	{    
+	    for (int p1 = 0; p1 < polygon1.points.size(); ++p1)
+	    {
+		const Point &point1 = polygon1.points[p1];
+		
+		introduce_ConsequentialPointOutsideFixedPolygon(Solver,
+								Context,
+								dec_var_X1 + point1.x(),
+								dec_var_Y1 + point1.y(),
+								dec_var_T1,
+								dec_value_X2,
+								dec_value_Y2,
+								dec_value_T2,				      
+								unreachable_polygons2[poly2]);
+	    }
+	}
+    }
+
+    for (int poly2 = 0; poly2 < unreachable_polygons2.size(); ++poly2)
+    {
+	if (unreachable_polygons2[poly2].area() < polygon1.area())
+	{    	    	
+	    for (int p2 = 0; p2 < unreachable_polygons2[poly2].points.size(); ++p2)
+	    {
+		const Point &pro_point2 = unreachable_polygons2[poly2].points[p2];
+		
+		introduce_ConsequentialFixedPointOutsidePolygon(Solver,
+								Context,
+								dec_value_X2 + pro_point2.x(),
+								dec_value_Y2 + pro_point2.y(),
+								dec_var_T1,
+								dec_var_X1,
+								dec_var_Y1,
+								dec_value_T2,
+								polygon1);
+	    }
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	if (unreachable_polygons1[poly1].area() > polygon2.area())
+	{    	    		        
+	    for (int p2 = 0; p2 < polygon2.points.size(); ++p2)
+	    {
+		const Point &point2 = polygon2.points[p2];
+		
+		introduce_ConsequentialFixedPointOutsidePolygon(Solver,
+								Context,
+								dec_value_X2 + point2.x(),
+								dec_value_Y2 + point2.y(),
+								dec_value_T2,				      
+								dec_var_X1,
+								dec_var_Y1,
+								dec_var_T1,
+								unreachable_polygons1[poly1]);
+	    }
+	}
+    }
+
+    for (int poly1 = 0; poly1 < unreachable_polygons1.size(); ++poly1)
+    {
+	if (unreachable_polygons1[poly1].area() < polygon2.area())
+	{    	    		        	
+	    for (int p1 = 0; p1 < unreachable_polygons1[poly1].points.size(); ++p1)
+	    {
+		const Point &pro_point1 = unreachable_polygons1[poly1].points[p1];
+		
+		introduce_ConsequentialPointOutsideFixedPolygon(Solver,
+								Context,
+								dec_var_X1 + pro_point1.x(),
+								dec_var_Y1 + pro_point1.y(),
+								dec_value_T2,				      
+								dec_value_X2,
+								dec_value_Y2,
+								dec_var_T1,
+								polygon2);
+	    }
+	}
+    }
+}
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+					 z3::context                        &Context,
+					 const z3::expr_vector              &dec_vars_X,
+					 const z3::expr_vector              &dec_vars_Y,
+					 const std::vector<Slic3r::Polygon> &polygons)
+{
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    introduce_PolygonOutsidePolygon(Solver,
+					    Context,
+					    dec_vars_X[i],
+					    dec_vars_Y[i],
+					    polygons[i],
+					    dec_vars_X[j],
+					    dec_vars_Y[j],
+					    polygons[j]);					    
+	}
+    }
+}
+
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   const std::vector<Slic3r::Polygon> &polygons,
+    						   const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+
+    introduce_SequentialPolygonWeakNonoverlapping(Solver,
+						  Context,
+						  dec_vars_X,
+						  dec_vars_Y,
+						  dec_vars_T,
+						  polygons,
+						  _unreachable_polygons);
+}
+
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    introduce_SequentialPolygonOutsidePolygon(Solver,
+						      Context,
+						      dec_vars_X[i],
+						      dec_vars_Y[i],
+						      dec_vars_T[i],
+						      polygons[i],
+						      unreachable_polygons[i],
+						      dec_vars_X[j],
+						      dec_vars_Y[j],
+						      dec_vars_T[j],
+						      polygons[j],
+						      unreachable_polygons[j]);
+	}
+    }
+}
+
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						      z3::context                        &Context,
+						      const z3::expr_vector              &dec_vars_X,
+						      const z3::expr_vector              &dec_vars_Y,
+						      const z3::expr_vector              &dec_vars_T,
+						      const std::vector<Slic3r::Polygon> &polygons,
+						      const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+
+    introduce_ConsequentialPolygonWeakNonoverlapping(Solver,
+						     Context,
+						     dec_vars_X,
+						     dec_vars_Y,
+						     dec_vars_T,
+						     polygons,
+						     _unreachable_polygons);
+}
+
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						      z3::context                                      &Context,
+						      const z3::expr_vector                            &dec_vars_X,
+						      const z3::expr_vector                            &dec_vars_Y,
+						      const z3::expr_vector                            &dec_vars_T,
+						      const std::vector<Slic3r::Polygon>               &polygons,
+						      const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    introduce_ConsequentialPolygonOutsidePolygon(Solver,
+							 Context,
+							 dec_vars_X[i],
+							 dec_vars_Y[i],
+							 dec_vars_T[i],
+							 polygons[i],
+							 unreachable_polygons[i],
+							 dec_vars_X[j],
+							 dec_vars_Y[j],
+							 dec_vars_T[j],
+							 polygons[j],
+							 unreachable_polygons[j]);
+	}
+    }
+}
+
+
+void introduce_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+					 z3::context                        &Context,
+					 const z3::expr_vector              &dec_vars_X,
+					 const z3::expr_vector              &dec_vars_Y,
+					 std::vector<Rational>              &dec_values_X,
+					 std::vector<Rational>              &dec_values_Y,
+					 const std::vector<int>             &fixed,
+					 const std::vector<int>             &undecided,
+					 const std::vector<Slic3r::Polygon> &polygons)
+{
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+	    introduce_PolygonOutsidePolygon(Solver,
+					    Context,
+					    dec_vars_X[undecided[i]],
+					    dec_vars_Y[undecided[i]],
+					    polygons[undecided[i]],
+					    dec_vars_X[undecided[j]],
+					    dec_vars_Y[undecided[j]],
+					    polygons[undecided[j]]);					    
+	}
+    }
+
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+	    introduce_PolygonOutsideFixedPolygon(Solver,
+						 Context,
+						 dec_vars_X[undecided[i]],
+						 dec_vars_Y[undecided[i]],
+						 polygons[undecided[i]],
+						 dec_values_X[fixed[j]],
+						 dec_values_Y[fixed[j]],
+						 polygons[fixed[j]]);					    	    
+	}
+    }
+}
+
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   std::vector<Rational>              &dec_values_X,
+						   std::vector<Rational>              &dec_values_Y,
+						   std::vector<Rational>              &dec_values_T,
+						   const std::vector<int>             &fixed,
+						   const std::vector<int>             &undecided,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+    
+    introduce_SequentialPolygonWeakNonoverlapping(Solver,
+						  Context,
+						  dec_vars_X,
+						  dec_vars_Y,
+						  dec_vars_T,
+						  dec_values_X,
+						  dec_values_Y,
+						  dec_values_T,
+						  fixed,
+						  undecided,
+						  polygons,
+						  _unreachable_polygons);   
+}
+
+
+void introduce_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,
+						   std::vector<Rational>                            &dec_values_X,
+						   std::vector<Rational>                            &dec_values_Y,
+						   std::vector<Rational>                            &dec_values_T,
+						   const std::vector<int>                           &fixed,
+						   const std::vector<int>                           &undecided,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+            #ifdef DEBUG
+	    {
+		printf("PoP: %d,%d\n", undecided[i], undecided[j]);
+	    }
+	    #endif
+	    introduce_SequentialPolygonOutsidePolygon(Solver,
+						      Context,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      dec_vars_T[undecided[i]],
+						      polygons[undecided[i]],
+						      unreachable_polygons[undecided[i]],
+						      dec_vars_X[undecided[j]],
+						      dec_vars_Y[undecided[j]],
+						      dec_vars_T[undecided[j]],
+						      polygons[undecided[j]],
+						      unreachable_polygons[undecided[j]]);
+	}
+    }
+
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+            #ifdef DEBUG
+	    {
+		printf("PoFP: %d,%d\n", undecided[i], fixed[j]);
+	    }
+	    #endif
+	    introduce_SequentialPolygonOutsideFixedPolygon(Solver,
+							   Context,
+							   dec_vars_X[undecided[i]],
+							   dec_vars_Y[undecided[i]],
+							   dec_vars_T[undecided[i]],
+							   polygons[undecided[i]],
+							   unreachable_polygons[undecided[i]],
+							   dec_values_X[fixed[j]],
+							   dec_values_Y[fixed[j]],
+							   dec_values_T[fixed[j]],
+							   polygons[fixed[j]],
+							   unreachable_polygons[fixed[j]]);
+	}
+    }
+}
+
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						      z3::context                        &Context,
+						      const z3::expr_vector              &dec_vars_X,
+						      const z3::expr_vector              &dec_vars_Y,
+						      const z3::expr_vector              &dec_vars_T,
+						      std::vector<Rational>              &dec_values_X,
+						      std::vector<Rational>              &dec_values_Y,
+						      std::vector<Rational>              &dec_values_T,
+						      const std::vector<int>             &fixed,
+						      const std::vector<int>             &undecided,
+						      const std::vector<Slic3r::Polygon> &polygons,
+						      const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+    
+    introduce_ConsequentialPolygonWeakNonoverlapping(Solver,
+						     Context,
+						     dec_vars_X,
+						     dec_vars_Y,
+						     dec_vars_T,
+						     dec_values_X,
+						     dec_values_Y,
+						     dec_values_T,
+						     fixed,
+						     undecided,
+						     polygons,
+						     _unreachable_polygons);   
+}
+
+
+void introduce_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						      z3::context                                      &Context,
+						      const z3::expr_vector                            &dec_vars_X,
+						      const z3::expr_vector                            &dec_vars_Y,
+						      const z3::expr_vector                            &dec_vars_T,
+						      std::vector<Rational>                            &dec_values_X,
+						      std::vector<Rational>                            &dec_values_Y,
+						      std::vector<Rational>                            &dec_values_T,
+						      const std::vector<int>                           &fixed,
+						      const std::vector<int>                           &undecided,
+						      const std::vector<Slic3r::Polygon>               &polygons,
+						      const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+            #ifdef DEBUG
+	    {
+		printf("PoP: %d,%d\n", undecided[i], undecided[j]);
+	    }
+	    #endif
+	    introduce_ConsequentialPolygonExternalPolygon(Solver,
+							  Context,
+							  dec_vars_X[undecided[i]],
+							  dec_vars_Y[undecided[i]],
+							  dec_vars_T[undecided[i]],
+							  polygons[undecided[i]],
+							  unreachable_polygons[undecided[i]],
+							  dec_vars_X[undecided[j]],
+							  dec_vars_Y[undecided[j]],
+							  dec_vars_T[undecided[j]],
+							  polygons[undecided[j]],
+							  unreachable_polygons[undecided[j]]);
+	}
+    }
+
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+            #ifdef DEBUG
+	    {
+		printf("PoFP: %d,%d\n", undecided[i], fixed[j]);
+	    }
+	    #endif
+	    introduce_ConsequentialPolygonExternalFixedPolygon(Solver,
+							       Context,
+							       dec_vars_X[undecided[i]],
+							       dec_vars_Y[undecided[i]],
+							       dec_vars_T[undecided[i]],
+							       polygons[undecided[i]],
+							       unreachable_polygons[undecided[i]],
+							       dec_values_X[fixed[j]],
+							       dec_values_Y[fixed[j]],
+							       dec_values_T[fixed[j]],
+							       polygons[fixed[j]],
+							       unreachable_polygons[fixed[j]]);
+	}
+    }
+}
+
+
+void introduce_PolygonStrongNonoverlapping(z3::solver                         &Solver,
+					   z3::context                        &Context,
+					   const z3::expr_vector              &dec_vars_X,
+					   const z3::expr_vector              &dec_vars_Y,
+					   const std::vector<Slic3r::Polygon> &polygons)
+{
+    introduce_PolygonWeakNonoverlapping(Solver,
+					Context,
+					dec_vars_X,
+					dec_vars_Y,
+					polygons);
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[i].points[p1];
+		const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+
+		for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[j].points[p2];
+		    const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+   
+		    introduce_LineNonIntersection(Solver,
+						  Context,
+						  dec_vars_X[i],
+						  dec_vars_Y[i],
+						  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						  Line(point1, next_point1),
+						  dec_vars_X[j],
+						  dec_vars_Y[j],
+						  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						  Line(point2, next_point2));
+		}
+	    }
+	}
+    }
+}
+
+
+bool lines_intersect_(coord_t ax, coord_t ay, coord_t ux, coord_t uy, coord_t bx, coord_t by, coord_t vx, coord_t vy)
+{    
+    coord_t den = ux * vy - uy * vx;
+    coord_t num = vx * ay - vx * by - vy * ax + vy * bx;
+
+    if (fabs(den) < EPSILON)
+    {
+	return false;	
+    }
+    else
+    {
+	double t = (double)num / den;
+	
+	if (t < 0.0 || t > 1.0)
+	{
+	    return false;
+	}
+	else
+	{
+	    if (abs(vx) > 0)
+	    {
+		double tt = (ax - bx + t * ux) / vx;
+		
+		if (tt < 0.0 || tt > 1.0)
+		{
+		    return false;
+		}
+		else
+		{
+		    #ifdef DEBUG
+		    {
+			printf("t:%.6f\n", t);		    
+			printf("tt:%.6f\n", tt);
+		    }
+		    #endif
+		    return true;
+		}
+	    }
+	    else
+	    {
+		if (abs(vy) > 0)
+		{
+		    double tt = (ay - by + t * uy) / vy;
+		
+		    if (tt < 0.0 || tt > 1.0)
+		    {
+			return false;
+		    }
+		    else
+		    {
+			#ifdef DEBUG
+			{			    
+			    printf("t:%.6f\n", t);
+			    printf("tt2:%.6f\n", tt);
+			}
+			#endif
+			return true;
+		    }
+		}
+		else
+		{		
+		    return false;
+		}
+	    }
+	}
+    }
+    
+    return false;
+}
+
+
+bool lines_intersect(double ax, double ay, double ux, double uy, double bx, double by, double vx, double vy)
+{
+    double den = ux * vy - uy * vx;
+    double num = vx * ay - vx * by - vy * ax + vy * bx;
+
+    if (fabs(den) < EPSILON)
+    {
+	return false;	
+    }
+    else
+    {
+	double t = num / den;
+	
+	if (t < 0.0 || t > 1.0)
+	{
+	    return false;
+	}
+	else
+	{
+	    if (fabs(vx) > EPSILON)
+	    {
+		double tt = (ax - bx + t * ux) / vx;
+		
+		if (tt < 0.0 || tt > 1.0)
+		{
+		    return false;
+		}
+		else
+		{
+//		    #ifdef DEBUG
+		    {
+			printf("t:%.6f\n", t);		    
+			printf("tt:%.6f\n", tt);
+		    }
+//		    #endif
+		    return true;
+		}
+	    }
+	    else
+	    {
+		if (fabs(vy) > EPSILON)
+		{
+		    double tt = (ay - by + t * uy) / vy;
+		
+		    if (tt < 0.0 || tt > 1.0)
+		    {
+			return false;
+		    }
+		    else
+		    {
+//			#ifdef DEBUG
+			{			    
+			    printf("t:%.6f\n", t);
+			    printf("tt2:%.6f\n", tt);
+			}
+//			#endif
+			return true;
+		    }
+		}
+		else
+		{		
+		    return false;
+		}
+	    }
+	}
+    }
+    
+    return false;
+}
+
+
+bool lines_intersect_closed(double ax, double ay, double ux, double uy, double bx, double by, double vx, double vy)
+{
+    return lines_intersect(ax, ay, ux, uy, bx, by, vx, vy);
+}
+
+
+bool lines_intersect_open(double ax, double ay, double ux, double uy, double bx, double by, double vx, double vy)
+{
+    double den = ux * vy - uy * vx;
+    double num = vx * ay - vx * by - vy * ax + vy * bx;
+
+    if (fabs(den) < EPSILON)
+    {
+	return false;	
+    }
+    else
+    {
+	double t = num / den;
+	
+	if (t < EPSILON || t > 1.0 - EPSILON)
+	{
+	    return false;
+	}
+	else
+	{
+	    if (fabs(vx) > EPSILON)
+	    {
+		double tt = (ax - bx + t * ux) / vx;
+		
+		if (tt < EPSILON || tt > 1.0 - EPSILON)
+		{
+		    return false;
+		}
+		else
+		{
+//		    #ifdef DEBUG
+		    {
+			printf("t:%.6f\n", t);		    
+			printf("tt:%.6f\n", tt);
+		    }
+//		    #endif
+		    return true;
+		}
+	    }
+	    else
+	    {
+		if (fabs(vy) > EPSILON)
+		{
+		    double tt = (ay - by + t * uy) / vy;
+		
+		    if (tt < EPSILON || tt > 1.0 - EPSILON)
+		    {
+			return false;
+		    }
+		    else
+		    {
+//			#ifdef DEBUG
+			{			    
+			    printf("t:%.6f\n", t);
+			    printf("tt2:%.6f\n", tt);
+			}
+//			#endif
+			return true;
+		    }
+		}
+		else
+		{		
+		    return false;
+		}
+	    }
+	}
+    }
+    
+    return false;
+}
+
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const std::vector<double>          &dec_values_X,
+				      const std::vector<double>          &dec_values_Y,
+				      const std::vector<Slic3r::Polygon> &polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[i].points[p1];
+		const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+
+		for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[j].points[p2];
+		    const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+
+		    Vec2d intersection(0,0);
+		    #ifdef DEBUG
+		    {
+			/*
+			printf("testing: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			       dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			       dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			       dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			       dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			*/
+		    }
+		    #endif
+
+		    /* Seems not working, report an intersection even if there is none, using out own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    if (lines_intersect(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+					next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+					next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+		    {
+			#ifdef DEBUG
+			{
+			    /*
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),
+				
+			       dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			       dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			       dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			       dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			    */
+			}
+			#endif
+			
+			introduce_LineNonIntersection(Solver,
+						      Context,
+						      dec_vars_X[i],
+						      dec_vars_Y[i],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[j],
+						      dec_vars_Y[j],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			refined = true;
+		    }
+		}
+	    }	    
+	}
+    }
+    return refined;
+}
+
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const z3::expr_vector              &dec_values_X,
+				      const z3::expr_vector              &dec_values_Y,
+				      const std::vector<Slic3r::Polygon> &polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[i].points[p1];
+		const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+
+		for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[j].points[p2];
+		    const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+
+		    Vec2d intersection(0, 0);
+		    #ifdef DEBUG
+		    {
+			printf("testing: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+			       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+			       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+			       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+		    }
+		    #endif
+
+		    /* Seems not working, report an intersection even if there is none, using out own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    if (lines_intersect(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+		    {
+			#ifdef DEBUG
+			{
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),				
+			       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+			       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+			       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+			       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+			}
+			#endif
+			
+			introduce_LineNonIntersection(Solver,
+						      Context,
+						      dec_vars_X[i],
+						      dec_vars_Y[i],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[j],
+						      dec_vars_Y[j],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			refined = true;
+		    }
+		}
+	    }	    
+	}
+    }
+    return refined;
+}
+
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const std::vector<Rational>        &dec_values_X,
+				      const std::vector<Rational>        &dec_values_Y,
+				      const std::vector<Slic3r::Polygon> &polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[i].points[p1];
+		const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+
+		for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[j].points[p2];
+		    const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+
+		    Vec2d intersection(0, 0);
+		    #ifdef DEBUG
+		    {
+			printf("testing mi: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+			       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+			       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+			       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+		    }
+		    #endif
+
+		    /* Seems not working, report an intersection even if there is none, using out own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    if (lines_intersect(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+		    {
+			#ifdef DEBUG
+			{
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),				
+			       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+			       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+			       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+			       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+			}
+			#endif
+			
+			introduce_LineNonIntersection(Solver,
+						      Context,
+						      dec_vars_X[i],
+						      dec_vars_Y[i],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[j],
+						      dec_vars_Y[j],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			refined = true;
+		    }
+		}
+	    }	    
+	}
+    }
+    return refined;
+}
+
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						z3::context                        &Context,
+						const z3::expr_vector              &dec_vars_X,
+						const z3::expr_vector              &dec_vars_Y,
+						const z3::expr_vector              &dec_vars_T,	
+						const std::vector<double>          &dec_values_X,
+						const std::vector<double>          &dec_values_Y,	
+						const std::vector<double>          &dec_values_T,
+						const std::vector<Slic3r::Polygon> &polygons,
+						const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    if (dec_values_T[i] > dec_values_T[j])
+	    {
+		for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[i].points[p1];
+		    const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+		    
+		    for (int p2 = 0; p2 < unreachable_polygons[j].points.size(); ++p2)
+		    {
+			const Point &point2 = unreachable_polygons[j].points[p2];
+			const Point &next_point2 = unreachable_polygons[j].points[(p2 + 1) % unreachable_polygons[j].points.size()];
+			
+                        #ifdef DEBUG
+			{
+	  		    printf("testing ni %d %d (%d,%d): [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", i, j, p1, p2,
+			           dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			           dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			           dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			           dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			}
+		        #endif
+
+			if (lines_intersect(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+					    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					    dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+					    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+			{
+			    #ifdef DEBUG
+			    {
+			    /*
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),
+				
+			       dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			       dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			       dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			       dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			    */
+			    }
+			    #endif
+
+			    introduce_SequentialLineNonIntersection(Solver,
+								    Context,
+								    dec_vars_X[i],
+								    dec_vars_Y[i],
+								    dec_vars_T[i],								    
+								    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+								    Line(point1, next_point1),
+								    dec_vars_X[j],
+								    dec_vars_Y[j],
+								    dec_vars_T[j],								    
+								    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+								    Line(point2, next_point2));
+			    refined = true;
+			}
+		    }
+		}	    
+	    }
+	    else
+	    {
+		if (dec_values_T[i] < dec_values_T[j])
+		{
+		    for (int p1 = 0; p1 < unreachable_polygons[i].points.size(); ++p1)
+		    {		
+			const Point &point1 = unreachable_polygons[i].points[p1];
+			const Point &next_point1 = unreachable_polygons[i].points[(p1 + 1) % unreachable_polygons[i].points.size()];
+		    
+			for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+			{
+			    const Point &point2 = polygons[j].points[p2];
+			    const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+			
+                            #ifdef DEBUG
+			    {
+			/*
+	  		    printf("testing: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			           dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			           dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			           dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			           dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			*/
+			    }
+		            #endif
+
+			    if (lines_intersect(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+			    /*
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),
+				
+			       dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			       dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			       dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			       dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			    */
+				}
+			        #endif
+
+				introduce_SequentialLineNonIntersection(Solver,
+									Context,
+									dec_vars_X[j],
+									dec_vars_Y[j],
+									dec_vars_T[j],
+									z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									Line(point2, next_point2),
+									dec_vars_X[i],
+									dec_vars_Y[i],
+									dec_vars_T[i],
+									z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									Line(point1, next_point1));
+				refined = true;
+			    }
+			}
+		    }	    		    
+		}
+		else
+		{
+		    #ifdef DEBUG
+		    {
+			printf("Time collision: %.3f, %.3f\n", dec_values_T[i], dec_values_T[j]);
+		    }
+		    #endif
+		    assert(false);
+		}
+	    }
+	}
+    }
+    return refined;
+}
+
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						z3::context                        &Context,
+						const z3::expr_vector              &dec_vars_X,
+						const z3::expr_vector              &dec_vars_Y,
+						const z3::expr_vector              &dec_vars_T,	
+						const std::vector<Rational>        &dec_values_X,
+						const std::vector<Rational>        &dec_values_Y,	
+						const std::vector<Rational>        &dec_values_T,
+						const std::vector<Slic3r::Polygon> &polygons,
+						const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }
+
+    return refine_SequentialPolygonWeakNonoverlapping(Solver,
+						      Context,
+						      dec_vars_X,
+						      dec_vars_Y,
+						      dec_vars_T,	
+						      dec_values_X,
+						      dec_values_Y,	
+						      dec_values_T,
+						      polygons,
+						      _unreachable_polygons);
+}
+
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						z3::context                                      &Context,
+						const z3::expr_vector                            &dec_vars_X,
+						const z3::expr_vector                            &dec_vars_Y,
+						const z3::expr_vector                            &dec_vars_T,	
+						const std::vector<Rational>                      &dec_values_X,
+						const std::vector<Rational>                      &dec_values_Y,	
+						const std::vector<Rational>                      &dec_values_T,
+						const std::vector<Slic3r::Polygon>               &polygons,
+						const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    if (dec_values_T[i] > dec_values_T[j])
+	    {
+		for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[i].points[p1];
+		    const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+
+		    for (int poly2 = 0; poly2 < unreachable_polygons[j].size(); ++poly2)
+		    {
+			#ifdef DEBUG
+			{			    
+			    printf("temporal: %.3f %.3f [ij: %d,%d]\n", dec_values_T[i].as_double(), dec_values_T[j].as_double(), i, j);
+			    printf("proto X1: %ld, %ld, %ld\n", unreachable_polygons.size(), unreachable_polygons[j].size(), unreachable_polygons[j][poly2].points.size());
+			}
+			#endif
+			       
+			for (int p2 = 0; p2 < unreachable_polygons[j][poly2].points.size(); ++p2)
+			{
+			    const Point &point2 = unreachable_polygons[j][poly2].points[p2];
+			    const Point &next_point2 = unreachable_polygons[j][poly2].points[(p2 + 1) % unreachable_polygons[j][poly2].points.size()];
+			
+                            #ifdef DEBUG
+			    {
+				printf("testing alpha %d %d (%d,%d): [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", i, j, p1, p2,
+				       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+				       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+				       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+				       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+			    }
+		            #endif
+
+			    if (lines_intersect(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    printf("temps: [ij: %d,%d] [%.3f, %.3f]\n", i, j,
+					   dec_values_T[i].as_double(),
+					   dec_values_T[j].as_double());
+						   
+				    printf("dec_values: [%.3f, %.3f] [%.3f,%.3f]\n",
+					   dec_values_X[i].as_double(),
+					   dec_values_Y[i].as_double(),
+					   dec_values_X[j].as_double(),
+					   dec_values_Y[j].as_double());
+				    
+				    printf("intersect 1: %d [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   hidden_var_cnt, 				
+					   dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					   dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					   dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					   dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				}
+			        #endif
+
+				introduce_SequentialLineNonIntersection(Solver,
+									Context,
+									dec_vars_X[i],
+									dec_vars_Y[i],
+									dec_vars_T[i],								    
+									z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									Line(point1, next_point1),
+									dec_vars_X[j],
+									dec_vars_Y[j],
+									dec_vars_T[j],								    
+									z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									Line(point2, next_point2));
+				refined = true;
+			    }
+			}
+		    }
+		}	    
+	    }
+	    else
+	    {
+		if (dec_values_T[i] < dec_values_T[j])
+		{
+		    for (int poly1 = 0; poly1 < unreachable_polygons[i].size(); ++poly1)
+		    {
+			for (int p1 = 0; p1 < unreachable_polygons[i][poly1].points.size(); ++p1)
+			{
+			    #ifdef DEBUG
+			    {
+				printf("proto2: %ld, %ld, %ld\n", unreachable_polygons.size(), unreachable_polygons[i].size(), unreachable_polygons[i][poly1].points.size());
+				//getchar();
+			    }
+			    #endif
+			    
+			    const Point &point1 = unreachable_polygons[i][poly1].points[p1];
+			    const Point &next_point1 = unreachable_polygons[i][poly1].points[(p1 + 1) % unreachable_polygons[i][poly1].points.size()];
+		    
+			    for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+			    {
+				const Point &point2 = polygons[j].points[p2];
+				const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+			
+                                #ifdef DEBUG
+				{
+				    printf("testing beta: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					   dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					   dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					   dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				}
+		                #endif
+
+				if (lines_intersect(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+						    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						    dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+						    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+				{
+			            #ifdef DEBUG
+				    {
+					printf("temps: [ij: %d,%d] [%.3f, %.3f]\n", i, j,
+					       dec_values_T[i].as_double(),
+					       dec_values_T[j].as_double());
+						   
+					printf("dec_values: [%.3f, %.3f] [%.3f,%.3f]\n",
+					       dec_values_X[i].as_double(),
+					       dec_values_Y[i].as_double(),
+					       dec_values_X[j].as_double(),
+					       dec_values_Y[j].as_double());
+					
+					printf("intersect 2: %d [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					       hidden_var_cnt, 				
+					       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				    }
+			            #endif
+
+				    introduce_SequentialLineNonIntersection(Solver,
+									    Context,
+									    dec_vars_X[j],
+									    dec_vars_Y[j],
+									    dec_vars_T[j],
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point2, next_point2),
+									    dec_vars_X[i],
+									    dec_vars_Y[i],
+									    dec_vars_T[i],
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point1, next_point1));
+				    /*
+				    introduce_SequentialLineNonIntersection(Solver,
+									    Context,
+									    dec_vars_X[i],
+									    dec_vars_Y[i],
+									    dec_vars_T[i],
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point1, next_point1),
+									    dec_vars_X[j],
+									    dec_vars_Y[j],
+									    dec_vars_T[j],
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point2, next_point2));
+
+				    */
+				    refined = true;
+				}
+			    }
+			}
+		    }	    		    
+		}
+		else
+		{
+		    #ifdef DEBUG
+		    {
+			printf("Time collision: %.3f, %.3f\n", dec_values_T[i].as_double(), dec_values_T[j].as_double());
+		    }
+		    #endif
+		    assert(false);
+		}
+	    }
+	}
+    }
+    return refined;
+}
+
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,	
+						   const std::vector<double>          &dec_values_X,
+						   const std::vector<double>          &dec_values_Y,	
+						   const std::vector<double>          &dec_values_T,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    if (dec_values_T[i] > dec_values_T[j])
+	    {
+		for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[i].points[p1];
+		    const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+		    
+		    for (int p2 = 0; p2 < unreachable_polygons[j].points.size(); ++p2)
+		    {
+			const Point &point2 = unreachable_polygons[j].points[p2];
+			const Point &next_point2 = unreachable_polygons[j].points[(p2 + 1) % unreachable_polygons[j].points.size()];
+			
+                        #ifdef DEBUG
+			{
+	  		    printf("testing ni %d %d (%d,%d): [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", i, j, p1, p2,
+			           dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			           dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			           dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			           dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			}
+		        #endif
+
+			if (lines_intersect(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+					    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					    dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+					    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+			{
+			    #ifdef DEBUG
+			    {
+				/*
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),
+				
+			       dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			       dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			       dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			       dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+				*/
+			    }
+			    #endif
+
+			    introduce_ConsequentialLineNonIntersection(Solver,
+								       Context,
+								       dec_vars_X[i],
+								       dec_vars_Y[i],
+								       dec_vars_T[i],								    
+								       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+								       Line(point1, next_point1),
+								       dec_vars_X[j],
+								       dec_vars_Y[j],
+								       dec_vars_T[j],								    
+								       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+								       Line(point2, next_point2));
+			    refined = true;
+			}
+		    }
+		}	    
+	    }
+	    else
+	    {
+		if (dec_values_T[i] < dec_values_T[j])
+		{
+		    for (int p1 = 0; p1 < unreachable_polygons[i].points.size(); ++p1)
+		    {		
+			const Point &point1 = unreachable_polygons[i].points[p1];
+			const Point &next_point1 = unreachable_polygons[i].points[(p1 + 1) % unreachable_polygons[i].points.size()];
+		    
+			for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+			{
+			    const Point &point2 = polygons[j].points[p2];
+			    const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+			
+                            #ifdef DEBUG
+			    {
+	  		    printf("testing: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			           dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+			           dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+			           dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+			           dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+			    }
+		            #endif
+
+			    if (lines_intersect(dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    /*
+				    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),
+					   dec_values_X[i] + point1.x(), dec_values_Y[i] + point1.y(),
+					   dec_values_X[i] + next_point1.x(), dec_values_Y[i] + next_point1.y(),
+					   dec_values_X[j] + point2.x(), dec_values_Y[j] + point2.y(),
+					   dec_values_X[j] + next_point2.x(), dec_values_Y[j] + next_point2.y());
+				    */
+				}
+			        #endif
+
+				introduce_ConsequentialLineNonIntersection(Solver,
+									   Context,
+									   dec_vars_X[j],
+									   dec_vars_Y[j],
+									   dec_vars_T[j],
+									   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									   Line(point2, next_point2),
+									   dec_vars_X[i],
+									   dec_vars_Y[i],
+									   dec_vars_T[i],
+									   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									   Line(point1, next_point1));
+				refined = true;
+			    }
+			}
+		    }	    		    
+		}
+		else
+		{
+		    #ifdef DEBUG
+		    {
+			printf("Time collision: %.3f, %.3f\n", dec_values_T[i], dec_values_T[j]);
+		    }
+		    #endif
+		    assert(false);
+		}
+	    }
+	}
+    }
+    return refined;
+}
+
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,	
+						   const std::vector<Rational>        &dec_values_X,
+						   const std::vector<Rational>        &dec_values_Y,	
+						   const std::vector<Rational>        &dec_values_T,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }
+
+    return refine_ConsequentialPolygonWeakNonoverlapping(Solver,
+							 Context,
+							 dec_vars_X,
+							 dec_vars_Y,
+							 dec_vars_T,	
+							 dec_values_X,
+							 dec_values_Y,	
+							 dec_values_T,
+							 polygons,
+							 _unreachable_polygons);
+}
+
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,	
+						   const std::vector<Rational>                      &dec_values_X,
+						   const std::vector<Rational>                      &dec_values_Y,	
+						   const std::vector<Rational>                      &dec_values_T,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    if (dec_values_T[i] > dec_values_T[j])
+	    {
+		for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[i].points[p1];
+		    const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+
+		    for (int poly2 = 0; poly2 < unreachable_polygons[j].size(); ++poly2)
+		    {
+			#ifdef DEBUG
+			{			    
+			    printf("temporal: %.3f %.3f [ij: %d,%d]\n", dec_values_T[i].as_double(), dec_values_T[j].as_double(), i, j);
+			    printf("proto X1: %ld, %ld, %ld\n", unreachable_polygons.size(), unreachable_polygons[j].size(), unreachable_polygons[j][poly2].points.size());
+			//getchar();
+			}
+			#endif
+			       
+			for (int p2 = 0; p2 < unreachable_polygons[j][poly2].points.size(); ++p2)
+			{
+			    const Point &point2 = unreachable_polygons[j][poly2].points[p2];
+			    const Point &next_point2 = unreachable_polygons[j][poly2].points[(p2 + 1) % unreachable_polygons[j][poly2].points.size()];
+			
+                            #ifdef DEBUG
+			    {
+				printf("testing alpha %d %d (%d,%d): [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", i, j, p1, p2,
+				       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+				       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+				       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+				       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+			    }
+		            #endif
+
+			    if (lines_intersect(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    printf("temps: [ij: %d,%d] [%.3f, %.3f]\n", i, j,
+					   dec_values_T[i].as_double(),
+					   dec_values_T[j].as_double());
+						   
+				    printf("dec_values: [%.3f, %.3f] [%.3f,%.3f]\n",
+					   dec_values_X[i].as_double(),
+					   dec_values_Y[i].as_double(),
+					   dec_values_X[j].as_double(),
+					   dec_values_Y[j].as_double());
+				    
+				    printf("intersect 1: %d [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   hidden_var_cnt, 				
+					   dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					   dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					   dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					   dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				}
+			        #endif
+
+				introduce_ConsequentialLineNonIntersection(Solver,
+									   Context,
+									   dec_vars_X[i],
+									   dec_vars_Y[i],
+									   dec_vars_T[i],								    
+									   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									   Line(point1, next_point1),
+									   dec_vars_X[j],
+									   dec_vars_Y[j],
+									   dec_vars_T[j],								    
+									   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									   Line(point2, next_point2));
+				refined = true;
+			    }
+			}
+		    }
+		}	    
+	    }
+	    else
+	    {
+		if (dec_values_T[i] < dec_values_T[j])
+		{
+		    for (int poly1 = 0; poly1 < unreachable_polygons[i].size(); ++poly1)
+		    {
+			for (int p1 = 0; p1 < unreachable_polygons[i][poly1].points.size(); ++p1)
+			{
+			    #ifdef DEBUG
+			    {
+				printf("proto2: %ld, %ld, %ld\n", unreachable_polygons.size(), unreachable_polygons[i].size(), unreachable_polygons[i][poly1].points.size());
+				//getchar();
+			    }
+			    #endif
+			    
+			    const Point &point1 = unreachable_polygons[i][poly1].points[p1];
+			    const Point &next_point1 = unreachable_polygons[i][poly1].points[(p1 + 1) % unreachable_polygons[i][poly1].points.size()];
+		    
+			    for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+			    {
+				const Point &point2 = polygons[j].points[p2];
+				const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+			
+                                #ifdef DEBUG
+				{
+				    printf("testing beta: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					   dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					   dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					   dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				}
+		                #endif
+
+				if (lines_intersect(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+						    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						    dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+						    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+				{
+			            #ifdef DEBUG
+				    {
+					printf("temps: [ij: %d,%d] [%.3f, %.3f]\n", i, j,
+					       dec_values_T[i].as_double(),
+					       dec_values_T[j].as_double());
+						   
+					printf("dec_values: [%.3f, %.3f] [%.3f,%.3f]\n",
+					       dec_values_X[i].as_double(),
+					       dec_values_Y[i].as_double(),
+					       dec_values_X[j].as_double(),
+					       dec_values_Y[j].as_double());
+					
+					printf("intersect 2: %d [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					       hidden_var_cnt, 				
+					       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				    }
+			            #endif
+
+				    introduce_ConsequentialLineNonIntersection(Solver,
+									       Context,
+									       dec_vars_X[j],
+									       dec_vars_Y[j],
+									       dec_vars_T[j],
+									       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									       Line(point2, next_point2),
+									       dec_vars_X[i],
+									       dec_vars_Y[i],
+									       dec_vars_T[i],
+									       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									       Line(point1, next_point1));
+				    /*
+				    introduce_SequentialLineNonIntersection(Solver,
+									    Context,
+									    dec_vars_X[i],
+									    dec_vars_Y[i],
+									    dec_vars_T[i],
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point1, next_point1),
+									    dec_vars_X[j],
+									    dec_vars_Y[j],
+									    dec_vars_T[j],
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point2, next_point2));
+
+				    */
+				    refined = true;
+				}
+			    }
+			}
+		    }	    		    
+		}
+		else
+		{
+		    #ifdef DEBUG
+		    {
+			printf("Time collision: %.3f, %.3f\n", dec_values_T[i].as_double(), dec_values_T[j].as_double());
+		    }
+		    #endif
+		    assert(false);
+		}
+	    }
+	}
+    }
+    return refined;
+}
+
+
+/*----------------------------------------------------------------*/
+
+void introduce_PolygonWeakNonoverlappingAgainstFixed(z3::solver                         &Solver,
+						     z3::context                        &Context,
+						     const z3::expr_vector              &dec_vars_X,
+						     const z3::expr_vector              &dec_vars_Y,
+						     const z3::expr_vector              &dec_values_X,
+						     const z3::expr_vector              &dec_values_Y,	
+						     const std::vector<int>             &decided,
+						     const std::vector<int>             &undecided,
+						     const std::vector<Slic3r::Polygon> &polygons)
+{
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+	    introduce_PolygonOutsidePolygon(Solver,
+					    Context,
+					    dec_vars_X[undecided[i]],
+					    dec_vars_Y[undecided[i]],
+					    polygons[undecided[i]],
+					    dec_vars_X[undecided[j]],
+					    dec_vars_Y[undecided[j]],
+					    polygons[undecided[j]]);					    
+	}
+    }
+
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < decided.size(); ++j)
+	{
+	    introduce_PolygonOutsidePolygon(Solver,
+					    Context,
+					    dec_vars_X[undecided[i]],
+					    dec_vars_Y[undecided[i]],
+					    polygons[undecided[i]],
+					    dec_values_X[decided[j]],
+					    dec_values_Y[decided[j]],
+					    polygons[decided[j]]);
+	}
+    }
+}
+
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const z3::expr_vector              &dec_values_X,
+				      const z3::expr_vector              &dec_values_Y,
+				      const std::vector<int>             &fixed,
+				      const std::vector<int>             &undecided,
+				      const std::vector<Slic3r::Polygon> &polygons)
+{
+    bool refined = false;
+
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+	    for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[undecided[i]].points[p1];
+		const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		for (int p2 = 0; p2 < polygons[undecided[j]].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[undecided[j]].points[p2];
+		    const Point &next_point2 = polygons[undecided[j]].points[(p2 + 1) % polygons[undecided[j]].points.size()];
+
+		    Vec2d intersection (0, 0);
+		    #ifdef DEBUG
+		    {
+			/*
+			printf("testing: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			       dec_values_X[undecided[i]].as_double() + point1.x(), dec_values_Y[undecided[i]].as_double() + point1.y(),
+			       dec_values_X[undecided[i]].as_double() + next_point1.x(), dec_values_Y[undecided[i]].as_double() + next_point1.y(),
+			       dec_values_X[undecided[j]].as_double() + point2.x(), dec_values_Y[undecided[j]].as_double() + point2.y(),
+			       dec_values_X[undecided[j]].as_double() + next_point2.x(), dec_values_Y[undecided[j]].as_double() + next_point2.y());
+			*/
+		    }
+		    #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[undecided[j]] + point2.x(), dec_values_Y[undecided[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    if (lines_intersect(dec_values_X[undecided[i]].as_double() + point1.x(), dec_values_Y[undecided[i]].as_double() + point1.y(),
+					next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					dec_values_X[undecided[j]].as_double() + point2.x(), dec_values_Y[undecided[j]].as_double() + point2.y(),
+					next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+		    {
+			#ifdef DEBUG
+			{
+			    /*
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),				
+			       dec_values_X[undecided[i]].as_double() + point1.x(), dec_values_Y[undecided[i]].as_double() + point1.y(),
+			       dec_values_X[undecided[i]].as_double() + next_point1.x(), dec_values_Y[undecided[i]].as_double() + next_point1.y(),
+			       dec_values_X[undecided[j]].as_double() + point2.x(), dec_values_Y[undecided[j]].as_double() + point2.y(),
+			       dec_values_X[undecided[j]].as_double() + next_point2.x(), dec_values_Y[undecided[j]].as_double() + next_point2.y());
+			    */
+			}
+			#endif
+			
+			introduce_LineNonIntersection(Solver,
+						      Context,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[undecided[j]],
+						      dec_vars_Y[undecided[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			refined = true;
+		    }
+		}
+	    }	    
+	}
+    }
+    
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+	    for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[undecided[i]].points[p1];
+		const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		for (int p2 = 0; p2 < polygons[fixed[j]].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[fixed[j]].points[p2];
+		    const Point &next_point2 = polygons[fixed[j]].points[(p2 + 1) % polygons[fixed[j]].points.size()];
+
+		    Vec2d intersection(0, 0);
+		    #ifdef DEBUG
+		    {
+			/*
+			printf("testing: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			       dec_values_X[undecided[i]].as_double() + point1.x(), dec_values_Y[undecided[i]].as_double() + point1.y(),
+			       dec_values_X[undecided[i]].as_double() + next_point1.x(), dec_values_Y[undecided[i]].as_double() + next_point1.y(),
+			       dec_values_X[fixed[j]].as_double() + point2.x(), dec_values_Y[fixed[j]].as_double() + point2.y(),
+			       dec_values_X[fixed[j]].as_double() + next_point2.x(), dec_values_Y[fixed[j]].as_double() + next_point2.y());
+			*/
+		    }
+		    #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[fixed[j]] + point2.x(), dec_values_Y[fixed[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    
+		    if (lines_intersect(dec_values_X[undecided[i]].as_double() + point1.x(), dec_values_Y[undecided[i]].as_double() + point1.y(),
+					next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					dec_values_X[fixed[j]].as_double() + point2.x(), dec_values_Y[fixed[j]].as_double() + point2.y(),
+					next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+		    {
+			#ifdef DEBUG
+			{
+			    /*
+			    printf("intersect: %d (%.3f,%.3f) - [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", hidden_var_cnt, intersection.x(), intersection.y(),				
+			       dec_values_X[undecided[i]].as_double() + point1.x(), dec_values_Y[undecided[i]].as_double() + point1.y(),
+			       dec_values_X[undecided[i]].as_double() + next_point1.x(), dec_values_Y[undecided[i]].as_double() + next_point1.y(),
+			       dec_values_X[fixed[j]].as_double() + point2.x(), dec_values_Y[fixed[j]].as_double() + point2.y(),
+			       dec_values_X[fixed[j]].as_double() + next_point2.x(), dec_values_Y[fixed[j]].as_double() + next_point2.y());
+			    */
+			}
+			#endif
+			
+			introduce_LineNonIntersection(Solver,
+						      Context,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[fixed[j]],
+						      dec_vars_Y[fixed[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			refined = true;
+		    }		    		    
+		}
+	    }
+	}
+    }
+	
+    return refined;
+}
+
+
+bool refine_PolygonWeakNonoverlapping(z3::solver                         &Solver,
+				      z3::context                        &Context,
+				      const z3::expr_vector              &dec_vars_X,
+				      const z3::expr_vector              &dec_vars_Y,
+				      const std::vector<Rational>        &dec_values_X,
+				      const std::vector<Rational>        &dec_values_Y,
+				      const std::vector<int>             &fixed,
+				      const std::vector<int>             &undecided,
+				      const std::vector<Slic3r::Polygon> &polygons)
+{
+    bool refined = false;
+
+    #ifdef DEBUG
+    {	
+	printf("Refining ***************************\n");
+    }
+    #endif
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+            #ifdef DEBUG
+	    {		    
+		printf("------------------------> Polygons: %d,%d\n", undecided[i], undecided[j]);
+	    }
+	    #endif
+	    for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[undecided[i]].points[p1];
+		const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		for (int p2 = 0; p2 < polygons[undecided[j]].points.size(); ++p2)
+ 		{
+		    const Point &point2 = polygons[undecided[j]].points[p2];
+		    const Point &next_point2 = polygons[undecided[j]].points[(p2 + 1) % polygons[undecided[j]].points.size()];
+
+		    Vec2d intersection (0, 0);
+		    #ifdef DEBUG
+		    {
+			printf("%d,%d - %ld,%ld,%ld,%ld  %ld,%ld,%ld,%ld\n", undecided[i], undecided[j],
+			       dec_values_X[undecided[i]].numerator,
+			       dec_values_X[undecided[i]].denominator,
+			       dec_values_Y[undecided[i]].numerator,
+			       dec_values_Y[undecided[i]].denominator,			       
+			       dec_values_X[undecided[j]].numerator,
+			       dec_values_X[undecided[j]].denominator,
+			       dec_values_Y[undecided[j]].numerator,
+			       dec_values_Y[undecided[j]].denominator);
+
+			printf("point1: %d,%d,%d,%d\n", point1.x(), point1.y(), next_point1.x(), next_point1.y());
+			printf("point2: %d,%d,%d,%d\n", point2.x(), point2.y(), next_point2.x(), next_point2.y());
+
+			printf("%ld,%ld\n", (dec_values_X[undecided[i]] + point1.x()).numerator, (dec_values_X[undecided[i]] + point1.x()).denominator);
+			printf("%ld,%ld\n", (dec_values_X[undecided[j]] + point1.x()).numerator, (dec_values_X[undecided[j]] + point1.x()).denominator);			
+						
+			printf("testing gamma: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+			       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+			       (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+			       (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+		    }
+		    #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[undecided[j]] + point2.x(), dec_values_Y[undecided[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					(dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+					next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+				   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+				   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+				   (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+				   (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+			}
+			#endif
+			
+			introduce_LineNonIntersection(Solver,
+						      Context,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[undecided[j]],
+						      dec_vars_Y[undecided[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			refined = true;
+		    }
+		}
+	    }	    
+	}
+    }
+    
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+            #ifdef DEBUG
+	    {	
+		printf("Fixo ------------------------> Polygons: %d,%d\n", undecided[i], fixed[j]);
+	    }
+	    #endif
+	    for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+	    {		
+		const Point &point1 = polygons[undecided[i]].points[p1];
+		const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		for (int p2 = 0; p2 < polygons[fixed[j]].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[fixed[j]].points[p2];
+		    const Point &next_point2 = polygons[fixed[j]].points[(p2 + 1) % polygons[fixed[j]].points.size()];
+
+		    Vec2d intersection(0, 0);
+		    #ifdef DEBUG
+		    {
+			printf("testing delta: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+			       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+			       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+			       (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+			       (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+		    }
+		    #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[fixed[j]] + point2.x(), dec_values_Y[fixed[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    
+		    if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+					(dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+					next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+			
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+				   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+				   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+				   (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+				   (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+			}
+			#endif
+
+			/*
+			introduce_LineNonIntersection(Solver,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[fixed[j]],
+						      dec_vars_Y[fixed[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			*/
+			introduce_LineNonIntersectionAgainstFixedLine(Solver,
+								      Context,
+								      dec_vars_X[undecided[i]],
+								      dec_vars_Y[undecided[i]],
+								      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+								      Line(point1, next_point1),
+								      dec_values_X[fixed[j]],
+								      dec_values_Y[fixed[j]],
+								      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+								      Line(point2, next_point2));			
+			refined = true;
+		    }		    		    
+		}
+	    }
+	}
+    }
+	
+    return refined;
+}
+
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						z3::context                        &Context,
+						const z3::expr_vector              &dec_vars_X,
+						const z3::expr_vector              &dec_vars_Y,
+						const z3::expr_vector              &dec_vars_T,
+						const std::vector<Rational>        &dec_values_X,
+						const std::vector<Rational>        &dec_values_Y,
+						const std::vector<Rational>        &dec_values_T,
+						const std::vector<int>             &fixed,
+						const std::vector<int>             &undecided,
+						const std::vector<Slic3r::Polygon> &polygons,
+						const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+
+    return refine_SequentialPolygonWeakNonoverlapping(Solver,
+						      Context,
+						      dec_vars_X,
+						      dec_vars_Y,
+						      dec_vars_T,
+						      dec_values_X,
+						      dec_values_Y,
+						      dec_values_T,
+						      fixed,
+						      undecided,
+						      polygons,
+						      _unreachable_polygons);
+}
+
+
+bool refine_SequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						z3::context                                      &Context,
+						const z3::expr_vector                            &dec_vars_X,
+						const z3::expr_vector                            &dec_vars_Y,
+						const z3::expr_vector                            &dec_vars_T,
+						const std::vector<Rational>                      &dec_values_X,
+						const std::vector<Rational>                      &dec_values_Y,
+						const std::vector<Rational>                      &dec_values_T,
+						const std::vector<int>                           &fixed,
+						const std::vector<int>                           &undecided,
+						const std::vector<Slic3r::Polygon>               &polygons,
+						const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    bool refined = false;
+
+    #ifdef DEBUG
+    {	
+	printf("Refining *************************** alpha\n");
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    printf("%d: %.3f,%.3f [%.3f]\n",
+		   undecided[i],
+		   dec_values_X[undecided[i]].as_double(),
+		   dec_values_Y[undecided[i]].as_double(),
+		   dec_values_T[undecided[i]].as_double()); 
+	}
+    }
+    #endif
+    
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{
+	    if (dec_values_T[undecided[i]] > dec_values_T[undecided[j]])
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("------------------------> Polygons: %d,%d\n", undecided[i], undecided[j]);
+		}
+		#endif
+		for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[undecided[i]].points[p1];
+		    const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		    for (int poly2 = 0; poly2 < unreachable_polygons[undecided[j]].size(); ++poly2)
+		    {
+			for (int p2 = 0; p2 < unreachable_polygons[undecided[j]][poly2].points.size(); ++p2)
+			{
+			    const Point &point2 = unreachable_polygons[undecided[j]][poly2].points[p2];
+			    const Point &next_point2 = unreachable_polygons[undecided[j]][poly2].points[(p2 + 1) % unreachable_polygons[undecided[j]][poly2].points.size()];
+
+			    Vec2d intersection (0, 0);
+		            #ifdef DEBUG
+			    {
+				printf("%d,%d - %ld,%ld,%ld,%ld  %ld,%ld,%ld,%ld\n", undecided[i], undecided[j],
+				       dec_values_X[undecided[i]].numerator,
+				       dec_values_X[undecided[i]].denominator,
+				       dec_values_Y[undecided[i]].numerator,
+				       dec_values_Y[undecided[i]].denominator,			       
+				       dec_values_X[undecided[j]].numerator,
+				       dec_values_X[undecided[j]].denominator,
+				       dec_values_Y[undecided[j]].numerator,
+				       dec_values_Y[undecided[j]].denominator);
+
+				printf("point1: %d,%d,%d,%d\n", point1.x(), point1.y(), next_point1.x(), next_point1.y());
+				printf("point2: %d,%d,%d,%d\n", point2.x(), point2.y(), next_point2.x(), next_point2.y());
+
+				printf("%ld,%ld\n", (dec_values_X[undecided[i]] + point1.x()).numerator, (dec_values_X[undecided[i]] + point1.x()).denominator);
+				printf("%ld,%ld\n", (dec_values_X[undecided[j]] + point2.x()).numerator, (dec_values_X[undecided[j]] + point2.x()).denominator);			
+						
+				printf("testing epsilon: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+				       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+				       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+				       (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+				       (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+			    }
+		            #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[undecided[j]] + point2.x(), dec_values_Y[undecided[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+			    if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						(dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+					   (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+				}
+			        #endif
+
+			    /*
+			    introduce_LineNonIntersection(Solver,
+							  dec_vars_X[undecided[i]],
+							  dec_vars_Y[undecided[i]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point1, next_point1),
+							  dec_vars_X[undecided[j]],
+							  dec_vars_Y[undecided[j]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point2, next_point2));
+			    */
+			    
+				introduce_SequentialLineNonIntersection(Solver,
+									Context,
+									dec_vars_X[undecided[i]],
+									dec_vars_Y[undecided[i]],
+									dec_vars_T[undecided[i]],								    
+									z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									Line(point1, next_point1),
+									dec_vars_X[undecided[j]],
+									dec_vars_Y[undecided[j]],
+									dec_vars_T[undecided[j]],								    
+									z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									Line(point2, next_point2));			
+				refined = true;
+			    }
+			}
+		    }
+		}	    
+	    }
+	    else
+	    {
+		if (dec_values_T[undecided[i]] < dec_values_T[undecided[j]])
+		{
+		    #ifdef DEBUG
+		    {	
+			printf("------------------------> Polygons: %d,%d\n", undecided[i], undecided[j]);
+		    }
+		    #endif
+		    for (int poly1 = 0; poly1 < unreachable_polygons[undecided[i]].size(); ++poly1)
+		    {
+			for (int p1 = 0; p1 < unreachable_polygons[undecided[i]][poly1].points.size(); ++p1)
+			{		
+			    const Point &point1 = unreachable_polygons[undecided[i]][poly1].points[p1];
+			    const Point &next_point1 = unreachable_polygons[undecided[i]][poly1].points[(p1 + 1) % unreachable_polygons[undecided[i]][poly1].points.size()];
+
+			    for (int p2 = 0; p2 < polygons[undecided[j]].points.size(); ++p2)
+			    {
+				const Point &point2 = polygons[undecided[j]].points[p2];
+				const Point &next_point2 = polygons[undecided[j]].points[(p2 + 1) % polygons[undecided[j]].points.size()];
+
+				Vec2d intersection (0, 0);
+		                #ifdef DEBUG
+				{
+				    printf("%d,%d - %ld,%ld,%ld,%ld  %ld,%ld,%ld,%ld\n", undecided[i], undecided[j],
+					   dec_values_X[undecided[i]].numerator,
+					   dec_values_X[undecided[i]].denominator,
+					   dec_values_Y[undecided[i]].numerator,
+					   dec_values_Y[undecided[i]].denominator,			       
+					   dec_values_X[undecided[j]].numerator,
+					   dec_values_X[undecided[j]].denominator,
+					   dec_values_Y[undecided[j]].numerator,
+					   dec_values_Y[undecided[j]].denominator);
+
+				    printf("point1: %d,%d,%d,%d\n", point1.x(), point1.y(), next_point1.x(), next_point1.y());
+				    printf("point2: %d,%d,%d,%d\n", point2.x(), point2.y(), next_point2.x(), next_point2.y());
+
+				    printf("%ld,%ld\n", (dec_values_X[undecided[i]] + point1.x()).numerator, (dec_values_X[undecided[i]] + point1.x()).denominator);
+				    printf("%ld,%ld\n", (dec_values_X[undecided[j]] + point2.x()).numerator, (dec_values_X[undecided[j]] + point2.x()).denominator);			
+						
+				    printf("testing iota: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+					   (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+				}
+		                #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[undecided[j]] + point2.x(), dec_values_Y[undecided[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+				if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						    (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+						    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				    
+				{
+			            #ifdef DEBUG
+				    {
+					printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					       (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+					       (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+				    }
+			            #endif
+
+			    /*
+			    introduce_LineNonIntersection(Solver,
+							  dec_vars_X[undecided[i]],
+							  dec_vars_Y[undecided[i]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point1, next_point1),
+							  dec_vars_X[undecided[j]],
+							  dec_vars_Y[undecided[j]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point2, next_point2));
+			    */
+
+				    #ifdef DEBUG
+				    {	
+					printf("Hidden var: %d\n", hidden_var_cnt);
+				    }
+				    #endif
+				    introduce_SequentialLineNonIntersection(Solver,
+									    Context,
+									    dec_vars_X[undecided[j]],
+									    dec_vars_Y[undecided[j]],
+									    dec_vars_T[undecided[j]],								    
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point2, next_point2),
+									    dec_vars_X[undecided[i]],
+									    dec_vars_Y[undecided[i]],
+									    dec_vars_T[undecided[i]],								    
+									    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									    Line(point1, next_point1));			
+				    refined = true;
+				}
+			    }
+			}
+		    }	    		    
+		}
+		else
+		{
+		    assert(false);
+		}
+	    }
+	}
+    }
+    
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{
+	    if (dec_values_T[undecided[i]] > dec_values_T[fixed[j]])
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("Fixo iota ------------------------> Polygons: %d,%d\n", undecided[i], fixed[j]);
+		    printf("Times iota: %.3f, %.3f\n", dec_values_T[undecided[i]].as_double(), dec_values_T[fixed[j]].as_double());
+		}
+		#endif
+		
+		for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[undecided[i]].points[p1];
+		    const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		    for (int poly2 = 0; poly2 < unreachable_polygons[fixed[j]].size(); ++poly2)
+		    {
+			for (int p2 = 0; p2 < unreachable_polygons[fixed[j]][poly2].points.size(); ++p2)
+			{
+			    const Point &point2 = unreachable_polygons[fixed[j]][poly2].points[p2];
+			    const Point &next_point2 = unreachable_polygons[fixed[j]][poly2].points[(p2 + 1) % unreachable_polygons[fixed[j]][poly2].points.size()];
+			    
+			    Vec2d intersection(0, 0);
+	 	            #ifdef DEBUG
+			    {
+				/*
+				printf("testing kappa: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+				       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+				       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+				       (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+				       (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+				*/
+			    }
+		            #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[fixed[j]] + point2.x(), dec_values_Y[fixed[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    
+			    if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						(dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+					   (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+
+				    printf("testing iota decs: [%.3f,%.3f] [%.3f,%.3f]\n",
+					   dec_values_X[undecided[i]].as_double(),
+					   dec_values_Y[undecided[i]].as_double(),
+					   dec_values_X[fixed[j]].as_double(),
+					   dec_values_Y[fixed[j]].as_double());					   				    
+				}
+			        #endif
+
+			/*
+			introduce_LineNonIntersection(Solver,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[fixed[j]],
+						      dec_vars_Y[fixed[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			*/
+				#ifdef DEBUG
+				{	
+				    printf("Hidden var iota: %d\n", hidden_var_cnt);
+				}
+				#endif
+				/*
+				int hidden_var1 = hidden_var_cnt++;
+				int hidden_var2 = hidden_var_cnt++;				
+				*/
+				introduce_SequentialLineNonIntersectionAgainstFixedLine(Solver,
+											Context,
+											dec_vars_X[undecided[i]],
+											dec_vars_Y[undecided[i]],
+											dec_vars_T[undecided[i]],
+											z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt + 0)).c_str())),
+											Line(point1, next_point1),
+											dec_values_X[fixed[j]],
+											dec_values_Y[fixed[j]],
+											dec_values_T[fixed[j]],	
+											z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt + 1)).c_str())),
+											Line(point2, next_point2));
+				hidden_var_cnt += 2;				
+				refined = true;
+			    }
+			}
+		    }
+		}
+	    }
+	    else
+	    {
+		if (dec_values_T[undecided[i]] < dec_values_T[fixed[j]])
+		{
+		    #ifdef DEBUG
+		    {	
+			printf("Times: %.3f, %.3f\n", dec_values_T[undecided[i]].as_double(), dec_values_T[fixed[j]].as_double());		    
+			printf("Fixo kappa ------------------------> Polygons: %d,%d\n", undecided[i], fixed[j]);
+		    }
+		    #endif
+		    
+		    for (int poly1 = 0; poly1 < unreachable_polygons[undecided[i]].size(); ++poly1)
+		    {
+			for (int p1 = 0; p1 < unreachable_polygons[undecided[i]][poly1].points.size(); ++p1)
+			{		
+			    const Point &point1 = unreachable_polygons[undecided[i]][poly1].points[p1];
+			    const Point &next_point1 = unreachable_polygons[undecided[i]][poly1].points[(p1 + 1) % unreachable_polygons[undecided[i]][poly1].points.size()];
+		    
+			    for (int p2 = 0; p2 < polygons[fixed[j]].points.size(); ++p2)
+			    {
+				const Point &point2 = polygons[fixed[j]].points[p2];
+				const Point &next_point2 = polygons[fixed[j]].points[(p2 + 1) % polygons[fixed[j]].points.size()];
+
+				Vec2d intersection(0, 0);
+  	 	                #ifdef DEBUG
+				{
+				    printf("testing lambda: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+					   (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+
+				    printf("testing kappa decs: [%.3f,%.3f] [%.3f,%.3f]\n",
+					   dec_values_X[undecided[i]].as_double(),
+					   dec_values_Y[undecided[i]].as_double(),
+					   dec_values_X[fixed[j]].as_double(),
+					   dec_values_Y[fixed[j]].as_double());
+				}
+		                #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[fixed[j]] + point2.x(), dec_values_Y[fixed[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    
+				if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						    (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+						    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				    
+				{
+			            #ifdef DEBUG
+				    {
+					printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					       (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+					       (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+				    }
+			            #endif
+
+			/*
+			introduce_LineNonIntersection(Solver,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[fixed[j]],
+						      dec_vars_Y[fixed[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			*/
+				    #ifdef DEBUG
+				    {	
+					printf("Hidden var kappa: %d\n", hidden_var_cnt);
+				    }
+				    #endif
+				    introduce_SequentialFixedLineNonIntersectionAgainstLine(Solver,
+											    Context,
+											    dec_values_X[fixed[j]],
+											    dec_values_Y[fixed[j]],
+											    dec_values_T[fixed[j]],
+											    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+											    Line(point2, next_point2),
+											    dec_vars_X[undecided[i]],
+											    dec_vars_Y[undecided[i]],
+											    dec_vars_T[undecided[i]],
+											    z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+											    Line(point1, next_point1));			
+				    refined = true;
+				}
+			    }
+			}
+		    }	   
+		}
+		else
+		{
+                    #ifdef DEBUG
+		    {	
+			printf("Times: %.3f, %.3f (%d,%d)\n", dec_values_T[undecided[i]].as_double(), dec_values_T[fixed[j]].as_double(), undecided[i], fixed[j]);
+			cout.flush();
+		    }
+		    #endif
+		    assert(false);
+		}
+	    }	       
+	}
+    }
+	
+    return refined;
+}
+
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                         &Solver,
+						   z3::context                        &Context,
+						   const z3::expr_vector              &dec_vars_X,
+						   const z3::expr_vector              &dec_vars_Y,
+						   const z3::expr_vector              &dec_vars_T,
+						   const std::vector<Rational>        &dec_values_X,
+						   const std::vector<Rational>        &dec_values_Y,
+						   const std::vector<Rational>        &dec_values_T,
+						   const std::vector<int>             &fixed,
+						   const std::vector<int>             &undecided,
+						   const std::vector<Slic3r::Polygon> &polygons,
+						   const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+
+    return refine_ConsequentialPolygonWeakNonoverlapping(Solver,
+							 Context,
+							 dec_vars_X,
+							 dec_vars_Y,
+							 dec_vars_T,
+							 dec_values_X,
+							 dec_values_Y,
+							 dec_values_T,
+							 fixed,
+							 undecided,
+							 polygons,
+							 _unreachable_polygons);
+}
+
+
+bool refine_ConsequentialPolygonWeakNonoverlapping(z3::solver                                       &Solver,
+						   z3::context                                      &Context,
+						   const z3::expr_vector                            &dec_vars_X,
+						   const z3::expr_vector                            &dec_vars_Y,
+						   const z3::expr_vector                            &dec_vars_T,
+						   const std::vector<Rational>                      &dec_values_X,
+						   const std::vector<Rational>                      &dec_values_Y,
+						   const std::vector<Rational>                      &dec_values_T,
+						   const std::vector<int>                           &fixed,
+						   const std::vector<int>                           &undecided,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    bool refined = false;
+
+    #ifdef DEBUG
+    {	
+	printf("Refining *************************** alpha\n");
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    printf("%d: %.3f,%.3f [%.3f]\n",
+		   undecided[i],
+		   dec_values_X[undecided[i]].as_double(),
+		   dec_values_Y[undecided[i]].as_double(),
+		   dec_values_T[undecided[i]].as_double()); 
+	}
+    }
+    #endif
+    
+    for (int i = 0; i < undecided.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < undecided.size(); ++j)
+	{	    
+	    if (dec_values_T[undecided[i]].is_Positive() && dec_values_T[undecided[j]].is_Positive() && dec_values_T[undecided[i]] > dec_values_T[undecided[j]])
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("------------------------> Polygons: %d,%d\n", undecided[i], undecided[j]);
+		}
+		#endif
+		for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[undecided[i]].points[p1];
+		    const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		    for (int poly2 = 0; poly2 < unreachable_polygons[undecided[j]].size(); ++poly2)
+		    {
+			for (int p2 = 0; p2 < unreachable_polygons[undecided[j]][poly2].points.size(); ++p2)
+			{
+			    const Point &point2 = unreachable_polygons[undecided[j]][poly2].points[p2];
+			    const Point &next_point2 = unreachable_polygons[undecided[j]][poly2].points[(p2 + 1) % unreachable_polygons[undecided[j]][poly2].points.size()];
+
+			    Vec2d intersection (0, 0);
+		            #ifdef DEBUG
+			    {
+				printf("%d,%d - %ld,%ld,%ld,%ld  %ld,%ld,%ld,%ld\n", undecided[i], undecided[j],
+				       dec_values_X[undecided[i]].numerator,
+				       dec_values_X[undecided[i]].denominator,
+				       dec_values_Y[undecided[i]].numerator,
+				       dec_values_Y[undecided[i]].denominator,			       
+				       dec_values_X[undecided[j]].numerator,
+				       dec_values_X[undecided[j]].denominator,
+				       dec_values_Y[undecided[j]].numerator,
+				       dec_values_Y[undecided[j]].denominator);
+
+				printf("point1: %d,%d,%d,%d\n", point1.x(), point1.y(), next_point1.x(), next_point1.y());
+				printf("point2: %d,%d,%d,%d\n", point2.x(), point2.y(), next_point2.x(), next_point2.y());
+
+				printf("%ld,%ld\n", (dec_values_X[undecided[i]] + point1.x()).numerator, (dec_values_X[undecided[i]] + point1.x()).denominator);
+				printf("%ld,%ld\n", (dec_values_X[undecided[j]] + point2.x()).numerator, (dec_values_X[undecided[j]] + point2.x()).denominator);			
+						
+				printf("testing epsilon: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+				       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+				       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+				       (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+				       (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+			    }
+		            #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[undecided[j]] + point2.x(), dec_values_Y[undecided[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+			    if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						(dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+					   (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+				}
+			        #endif
+
+			    /*
+			    introduce_LineNonIntersection(Solver,
+							  dec_vars_X[undecided[i]],
+							  dec_vars_Y[undecided[i]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point1, next_point1),
+							  dec_vars_X[undecided[j]],
+							  dec_vars_Y[undecided[j]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point2, next_point2));
+			    */
+			    
+				introduce_ConsequentialLineNonIntersection(Solver,
+									   Context,
+									   dec_vars_X[undecided[i]],
+									   dec_vars_Y[undecided[i]],
+									   dec_vars_T[undecided[i]],								    
+									   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									   Line(point1, next_point1),
+									   dec_vars_X[undecided[j]],
+									   dec_vars_Y[undecided[j]],
+									   dec_vars_T[undecided[j]],								    
+									   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									   Line(point2, next_point2));			
+				refined = true;
+			    }
+			}
+		    }
+		}	    
+	    }
+	    else
+	    {
+		if (dec_values_T[undecided[i]].is_Positive() && dec_values_T[undecided[j]].is_Positive() && dec_values_T[undecided[i]] < dec_values_T[undecided[j]])
+		{
+		    #ifdef DEBUG
+		    {	
+			printf("------------------------> Polygons: %d,%d\n", undecided[i], undecided[j]);
+		    }
+		    #endif
+		    for (int poly1 = 0; poly1 < unreachable_polygons[undecided[i]].size(); ++poly1)
+		    {
+			for (int p1 = 0; p1 < unreachable_polygons[undecided[i]][poly1].points.size(); ++p1)
+			{		
+			    const Point &point1 = unreachable_polygons[undecided[i]][poly1].points[p1];
+			    const Point &next_point1 = unreachable_polygons[undecided[i]][poly1].points[(p1 + 1) % unreachable_polygons[undecided[i]][poly1].points.size()];
+
+			    for (int p2 = 0; p2 < polygons[undecided[j]].points.size(); ++p2)
+			    {
+				const Point &point2 = polygons[undecided[j]].points[p2];
+				const Point &next_point2 = polygons[undecided[j]].points[(p2 + 1) % polygons[undecided[j]].points.size()];
+
+				Vec2d intersection (0, 0);
+		                #ifdef DEBUG
+				{
+				    printf("%d,%d - %ld,%ld,%ld,%ld  %ld,%ld,%ld,%ld\n", undecided[i], undecided[j],
+					   dec_values_X[undecided[i]].numerator,
+					   dec_values_X[undecided[i]].denominator,
+					   dec_values_Y[undecided[i]].numerator,
+					   dec_values_Y[undecided[i]].denominator,			       
+					   dec_values_X[undecided[j]].numerator,
+					   dec_values_X[undecided[j]].denominator,
+					   dec_values_Y[undecided[j]].numerator,
+					   dec_values_Y[undecided[j]].denominator);
+
+				    printf("point1: %d,%d,%d,%d\n", point1.x(), point1.y(), next_point1.x(), next_point1.y());
+				    printf("point2: %d,%d,%d,%d\n", point2.x(), point2.y(), next_point2.x(), next_point2.y());
+
+				    printf("%ld,%ld\n", (dec_values_X[undecided[i]] + point1.x()).numerator, (dec_values_X[undecided[i]] + point1.x()).denominator);
+				    printf("%ld,%ld\n", (dec_values_X[undecided[j]] + point2.x()).numerator, (dec_values_X[undecided[j]] + point2.x()).denominator);			
+						
+				    printf("testing iota: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+					   (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+				}
+		                #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[undecided[j]] + point2.x(), dec_values_Y[undecided[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+				if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						    (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+						    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				    
+				{
+			            #ifdef DEBUG
+				    {
+					printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					       (dec_values_X[undecided[j]] + point2.x()).as_double(), (dec_values_Y[undecided[j]] + point2.y()).as_double(),
+					       (dec_values_X[undecided[j]] + next_point2.x()).as_double(), (dec_values_Y[undecided[j]] + next_point2.y()).as_double());
+				    }
+			            #endif
+
+			    /*
+			    introduce_LineNonIntersection(Solver,
+							  dec_vars_X[undecided[i]],
+							  dec_vars_Y[undecided[i]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point1, next_point1),
+							  dec_vars_X[undecided[j]],
+							  dec_vars_Y[undecided[j]],
+							  z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+							  Line(point2, next_point2));
+			    */
+
+				    #ifdef DEBUG
+				    {	
+					printf("Hidden var: %d\n", hidden_var_cnt);
+				    }
+				    #endif
+				    introduce_ConsequentialLineNonIntersection(Solver,
+									       Context,
+									       dec_vars_X[undecided[j]],
+									       dec_vars_Y[undecided[j]],
+									       dec_vars_T[undecided[j]],								    
+									       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									       Line(point2, next_point2),
+									       dec_vars_X[undecided[i]],
+									       dec_vars_Y[undecided[i]],
+									       dec_vars_T[undecided[i]],								    
+									       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+									       Line(point1, next_point1));			
+				    refined = true;
+				}
+			    }
+			}
+		    }	    		    
+		}
+		else
+		{
+		    #ifdef DEBUG
+		    {
+			printf("The pair is not effective: %d,%d\n", undecided[i], undecided[j]);
+		    }
+		    #endif
+		}
+	    }
+	}
+    }
+
+    
+    for (int i = 0; i < undecided.size(); ++i)
+    {
+	for (int j = 0; j < fixed.size(); ++j)
+	{	    
+	    if (dec_values_T[undecided[i]].is_Positive() && dec_values_T[fixed[j]].is_Positive() && dec_values_T[undecided[i]] > dec_values_T[fixed[j]])
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("Fixo iota ------------------------> Polygons: %d,%d\n", undecided[i], fixed[j]);
+		    printf("Times iota: %.3f, %.3f\n", dec_values_T[undecided[i]].as_double(), dec_values_T[fixed[j]].as_double());
+		}
+		#endif
+		for (int p1 = 0; p1 < polygons[undecided[i]].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[undecided[i]].points[p1];
+		    const Point &next_point1 = polygons[undecided[i]].points[(p1 + 1) % polygons[undecided[i]].points.size()];
+
+		    for (int poly2 = 0; poly2 < unreachable_polygons[fixed[j]].size(); ++poly2)
+		    {
+			for (int p2 = 0; p2 < unreachable_polygons[fixed[j]][poly2].points.size(); ++p2)
+			{
+			    const Point &point2 = unreachable_polygons[fixed[j]][poly2].points[p2];
+			    const Point &next_point2 = unreachable_polygons[fixed[j]][poly2].points[(p2 + 1) % unreachable_polygons[fixed[j]][poly2].points.size()];
+			    
+			    Vec2d intersection(0, 0);
+	 	            #ifdef DEBUG
+			    {
+				/*
+				printf("testing kappa: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+				       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+				       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+				       (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+				       (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+				*/
+			    }
+		            #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[fixed[j]] + point2.x(), dec_values_Y[fixed[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    
+			    if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						(dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+						next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+					   (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+
+				    printf("testing iota decs: [%.3f,%.3f] [%.3f,%.3f]\n",
+					   dec_values_X[undecided[i]].as_double(),
+					   dec_values_Y[undecided[i]].as_double(),
+					   dec_values_X[fixed[j]].as_double(),
+					   dec_values_Y[fixed[j]].as_double());					   				    
+				}
+			        #endif
+
+			/*
+			introduce_LineNonIntersection(Solver,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[fixed[j]],
+						      dec_vars_Y[fixed[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			*/
+				#ifdef DEBUG
+				{	
+				    printf("Hidden var iota: %d\n", hidden_var_cnt);
+				}
+				#endif
+				/*
+				int hidden_var1 = hidden_var_cnt++;
+				int hidden_var2 = hidden_var_cnt++;				
+				*/
+				introduce_ConsequentialLineNonIntersectionAgainstFixedLine(Solver,
+											   Context,
+											   dec_vars_X[undecided[i]],
+											   dec_vars_Y[undecided[i]],
+											   dec_vars_T[undecided[i]],
+											   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt + 0)).c_str())),
+											   Line(point1, next_point1),
+											   dec_values_X[fixed[j]],
+											   dec_values_Y[fixed[j]],
+											   dec_values_T[fixed[j]],	
+											   z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt + 1)).c_str())),
+											   Line(point2, next_point2));
+				hidden_var_cnt += 2;				
+				refined = true;
+			    }
+			}
+		    }
+		}
+	    }
+	    else
+	    {	
+		if (dec_values_T[undecided[i]].is_Positive() && dec_values_T[fixed[j]].is_Positive() && dec_values_T[undecided[i]] < dec_values_T[fixed[j]])
+		{
+		    #ifdef DEBUG
+		    {	
+			printf("Times: %.3f, %.3f\n", dec_values_T[undecided[i]].as_double(), dec_values_T[fixed[j]].as_double());		    
+			printf("Fixo kappa ------------------------> Polygons: %d,%d\n", undecided[i], fixed[j]);
+		    }
+		    #endif
+		    
+		    for (int poly1 = 0; poly1 < unreachable_polygons[undecided[i]].size(); ++poly1)
+		    {
+			for (int p1 = 0; p1 < unreachable_polygons[undecided[i]][poly1].points.size(); ++p1)
+			{		
+			    const Point &point1 = unreachable_polygons[undecided[i]][poly1].points[p1];
+			    const Point &next_point1 = unreachable_polygons[undecided[i]][poly1].points[(p1 + 1) % unreachable_polygons[undecided[i]][poly1].points.size()];
+		    
+			    for (int p2 = 0; p2 < polygons[fixed[j]].points.size(); ++p2)
+			    {
+				const Point &point2 = polygons[fixed[j]].points[p2];
+				const Point &next_point2 = polygons[fixed[j]].points[(p2 + 1) % polygons[fixed[j]].points.size()];
+
+				Vec2d intersection(0, 0);
+  	 	                #ifdef DEBUG
+				{
+				    printf("testing lambda: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					   (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					   (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+					   (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+
+				    printf("testing kappa decs: [%.3f,%.3f] [%.3f,%.3f]\n",
+					   dec_values_X[undecided[i]].as_double(),
+					   dec_values_Y[undecided[i]].as_double(),
+					   dec_values_X[fixed[j]].as_double(),
+					   dec_values_Y[fixed[j]].as_double());
+				}
+		                #endif
+
+		    /* Seems not working, report an intersection even if there is none, using our own lines_intersect() instead
+		    if (Slic3r::Geometry::segment_segment_intersection(Vec2d(dec_values_X[undecided[i]] + point1.x(), dec_values_Y[undecided[i]] + point1.y()),
+								       Vec2d(next_point1.x() - point1.x(), next_point1.y() - point1.y()),
+								       Vec2d(dec_values_X[fixed[j]] + point2.x(), dec_values_Y[fixed[j]] + point2.y()),
+								       Vec2d(next_point2.x() - point2.x(), next_point2.y() - point2.y()),
+								       intersection))
+		    */
+		    
+				if (lines_intersect((dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+						    next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						    (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+						    next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				    
+				{
+			            #ifdef DEBUG
+				    {
+					printf("Intersecting: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					       (dec_values_X[undecided[i]] + point1.x()).as_double(), (dec_values_Y[undecided[i]] + point1.y()).as_double(),
+					       (dec_values_X[undecided[i]] + next_point1.x()).as_double(), (dec_values_Y[undecided[i]] + next_point1.y()).as_double(),
+					       (dec_values_X[fixed[j]] + point2.x()).as_double(), (dec_values_Y[fixed[j]] + point2.y()).as_double(),
+					       (dec_values_X[fixed[j]] + next_point2.x()).as_double(), (dec_values_Y[fixed[j]] + next_point2.y()).as_double());
+				    }
+			            #endif
+
+			/*
+			introduce_LineNonIntersection(Solver,
+						      dec_vars_X[undecided[i]],
+						      dec_vars_Y[undecided[i]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point1, next_point1),
+						      dec_vars_X[fixed[j]],
+						      dec_vars_Y[fixed[j]],
+						      z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+						      Line(point2, next_point2));
+			*/
+				    #ifdef DEBUG
+				    {	
+					printf("Hidden var kappa: %d\n", hidden_var_cnt);
+				    }
+				    #endif
+				    introduce_ConsequentialFixedLineNonIntersectionAgainstLine(Solver,
+											       Context,
+											       dec_values_X[fixed[j]],
+											       dec_values_Y[fixed[j]],
+											       dec_values_T[fixed[j]],
+											       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+											       Line(point2, next_point2),
+											       dec_vars_X[undecided[i]],
+											       dec_vars_Y[undecided[i]],
+											       dec_vars_T[undecided[i]],
+											       z3::expr(Context.real_const(("hidden-var-" + to_string(hidden_var_cnt++)).c_str())),
+											       Line(point1, next_point1));			
+				    refined = true;
+				}
+			    }
+			}
+		    }	   
+		}
+		else
+		{
+                    #ifdef DEBUG
+		    {	
+			printf("Times: %.3f, %.3f (%d,%d)\n", dec_values_T[undecided[i]].as_double(), dec_values_T[fixed[j]].as_double(), undecided[i], fixed[j]);
+			cout.flush();
+		    }
+		    #endif
+		    
+                    #ifdef DEBUG
+		    {
+			printf("The pair is not effective: %d,%d\n", undecided[i], fixed[j]);
+		    }
+		    #endif
+		}
+	    }	       
+	}
+    }
+	
+    return refined;
+}
+
+
+/*----------------------------------------------------------------*/
+
+bool check_PointsOutsidePolygons(const std::vector<Rational>                      &dec_values_X,
+				 const std::vector<Rational>                      &dec_values_Y,	
+				 const std::vector<Rational>                      &dec_values_T,
+				 const std::vector<Slic3r::Polygon>               &polygons,
+				 const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    if (dec_values_T[i] > dec_values_T[j])
+	    {
+		for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+		{
+		    const Point &point1 = polygons[i].points[p1];
+		    
+		    #ifdef DEBUG
+		    {
+			printf(">----------------\n");
+		    }
+		    #endif
+		    
+		    for (int poly2 = 0; poly2 < unreachable_polygons[j].size(); ++poly2)
+		    {
+			if (unreachable_polygons[j][poly2].points.size() >= 3)
+			{
+			    bool always_inside_halfplane = true;
+			    
+			    for (int p2 = 0; p2 < unreachable_polygons[j][poly2].points.size(); ++p2)
+			    {
+				const Point &point2 = unreachable_polygons[j][poly2].points[p2];
+				const Point &next_point2 = unreachable_polygons[j][poly2].points[(p2 + 1) % unreachable_polygons[j][poly2].points.size()];
+			    
+				Line line(point2, next_point2);
+				Vector normal = line.normal();
+				
+				double outside =  (normal.x() * (dec_values_X[i].as_double() + point1.x()))
+				                + (normal.y() * (dec_values_Y[i].as_double() + point1.y()))
+				                - (normal.x() * dec_values_X[j].as_double())
+				                - (normal.x() * line.a.x())
+					        - (normal.y() * dec_values_Y[j].as_double())
+					        - (normal.y() * line.a.y());
+
+				#ifdef DEBUG
+				{
+				    printf("Tested point: %d, %d\n", point1.x(), point1.y());
+				    printf("Point: %d, %d\n", point2.x(), point2.y());
+				    printf("Next point: %d, %d\n", next_point2.x(), next_point2.y());				    				    
+				    printf("X[i]: %.3f, Y[i]: %.3f, X[j]: %.3f, Y[j]: %.3f\n", dec_values_X[i].as_double(), dec_values_Y[i].as_double(), dec_values_X[j].as_double(), dec_values_Y[j].as_double());				    
+				    printf("Outside 1: %.3f\n", outside);
+				}
+				#endif
+
+				if (outside > -EPSILON)
+				{
+				    always_inside_halfplane = false;
+				    break;
+				}
+			    }
+			    if (always_inside_halfplane)
+			    {
+				return false;
+			    }
+			}
+		    }
+		}
+	    }
+	    else if (dec_values_T[i] < dec_values_T[j])
+	    {
+		for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+		{
+		    const Point &point2 = polygons[j].points[p2];
+
+		    #ifdef DEBUG
+		    {
+			printf("<----------------\n");
+		    }
+		    #endif
+				
+		    for (int poly1 = 0; poly1 < unreachable_polygons[i].size(); ++poly1)
+		    {	       	
+			if (unreachable_polygons[i][poly1].points.size() >= 3)
+			{
+			    bool always_inside_halfplane = true;
+						
+			    for (int p1 = 0; p1 < unreachable_polygons[i][poly1].points.size(); ++p1)
+			    {			    
+				const Point &point1 = unreachable_polygons[i][poly1].points[p1];
+				const Point &next_point1 = unreachable_polygons[i][poly1].points[(p1 + 1) % unreachable_polygons[i][poly1].points.size()];
+
+				Line line(point1, next_point1);
+				Vector normal = line.normal();
+				
+				double outside =  (normal.x() * (dec_values_X[j].as_double() + point2.x()))
+				                + (normal.y() * (dec_values_Y[j].as_double() + point2.y()))		 
+				                - (normal.x() * dec_values_X[i].as_double())
+				                - (normal.x() * line.a.x())
+					        - (normal.y() * dec_values_Y[i].as_double())
+				                - (normal.y() * line.a.y());
+
+				#ifdef DEBUG
+				{
+				    printf("Tested point: %.3f, %.3f\n", dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y());				    
+				    printf("Point: %.3f, %.3f\n", point1.x() + dec_values_X[i].as_double(), point1.y() + dec_values_Y[i].as_double());
+				    printf("Next point: %.3f, %.3f\n", next_point1.x() + dec_values_X[i].as_double(), next_point1.y() + dec_values_Y[i].as_double());				    
+				    printf("X[i]: %.3f, Y[i]: %.3f, X[j]: %.3f, Y[j]: %.3f\n", dec_values_X[i].as_double(), dec_values_Y[i].as_double(), dec_values_X[j].as_double(), dec_values_Y[j].as_double());
+				    printf("Outside 2: %.3f\n", outside);
+				}
+				#endif				
+
+				if (outside > -EPSILON)
+				{
+				    always_inside_halfplane = false;
+				    break;
+				}				
+			    }
+			    if (always_inside_halfplane)
+			    {
+				return false;
+			    }
+			}
+		    }
+		}		
+	    }
+	    else
+	    {
+                #ifdef DEBUG
+		{
+		    printf("Time collision: %.3f, %.3f\n", dec_values_T[i].as_double(), dec_values_T[j].as_double());
+		}
+		#endif
+		assert(false);		
+	    }
+   	}
+    }
+    #ifdef DEBUG
+    {
+	printf("Points DONE !!!\n");
+    }
+    #endif
+
+    return true;
+}
+
+
+bool check_PolygonLineIntersections(const std::vector<Rational>                      &dec_values_X,
+				    const std::vector<Rational>                      &dec_values_Y,	
+				    const std::vector<Rational>                      &dec_values_T,
+				    const std::vector<Slic3r::Polygon>               &polygons,
+				    const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    for (int i = 0; i < polygons.size() - 1; ++i)
+    {
+	for (int j = i + 1; j < polygons.size(); ++j)
+	{
+	    if (dec_values_T[i] > dec_values_T[j])
+	    {
+		for (int p1 = 0; p1 < polygons[i].points.size(); ++p1)
+		{		
+		    const Point &point1 = polygons[i].points[p1];
+		    const Point &next_point1 = polygons[i].points[(p1 + 1) % polygons[i].points.size()];
+
+		    for (int poly2 = 0; poly2 < unreachable_polygons[j].size(); ++poly2)
+		    {
+			#ifdef DEBUG
+			{			    
+			    printf("temporal: %.3f %.3f [ij: %d,%d]\n", dec_values_T[i].as_double(), dec_values_T[j].as_double(), i, j);
+			    printf("proto X1: %ld, %ld, %ld\n", unreachable_polygons.size(), unreachable_polygons[j].size(), unreachable_polygons[j][poly2].points.size());
+			}
+			#endif
+			       
+			for (int p2 = 0; p2 < unreachable_polygons[j][poly2].points.size(); ++p2)
+			{
+			    const Point &point2 = unreachable_polygons[j][poly2].points[p2];
+			    const Point &next_point2 = unreachable_polygons[j][poly2].points[(p2 + 1) % unreachable_polygons[j][poly2].points.size()];
+			
+                            #ifdef DEBUG
+			    {
+				printf("testing alpha %d %d (%d,%d): [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n", i, j, p1, p2,
+				       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+				       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+				       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+				       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+			    }
+		            #endif
+
+			    if (lines_intersect_open(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+						     next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+						     dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+						     next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+			    {
+			        #ifdef DEBUG
+				{
+				    printf("temps: [ij: %d,%d] [%.3f, %.3f]\n", i, j,
+					   dec_values_T[i].as_double(),
+					   dec_values_T[j].as_double());
+						   
+				    printf("dec_values: [%.3f, %.3f] [%.3f,%.3f]\n",
+					   dec_values_X[i].as_double(),
+					   dec_values_Y[i].as_double(),
+					   dec_values_X[j].as_double(),
+					   dec_values_Y[j].as_double());
+				    
+				    printf("intersect 1: %d [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   hidden_var_cnt, 				
+					   dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					   dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					   dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					   dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				}
+			        #endif
+
+				return false;
+			    }
+			}
+		    }
+		}	    
+	    }
+	    else
+	    {
+		if (dec_values_T[i] < dec_values_T[j])
+		{
+		    for (int poly1 = 0; poly1 < unreachable_polygons[i].size(); ++poly1)
+		    {
+			for (int p1 = 0; p1 < unreachable_polygons[i][poly1].points.size(); ++p1)
+			{
+			    #ifdef DEBUG
+			    {
+				printf("proto2: %ld, %ld, %ld\n", unreachable_polygons.size(), unreachable_polygons[i].size(), unreachable_polygons[i][poly1].points.size());
+			    }
+			    #endif
+			    
+			    const Point &point1 = unreachable_polygons[i][poly1].points[p1];
+			    const Point &next_point1 = unreachable_polygons[i][poly1].points[(p1 + 1) % unreachable_polygons[i][poly1].points.size()];
+		    
+			    for (int p2 = 0; p2 < polygons[j].points.size(); ++p2)
+			    {
+				const Point &point2 = polygons[j].points[p2];
+				const Point &next_point2 = polygons[j].points[(p2 + 1) % polygons[j].points.size()];
+			
+                                #ifdef DEBUG
+				{
+				    printf("testing beta: [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					   dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					   dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					   dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					   dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				}
+		                #endif
+
+				if (lines_intersect_open(dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+							 next_point1.x() - point1.x(), next_point1.y() - point1.y(),
+							 dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+							 next_point2.x() - point2.x(), next_point2.y() - point2.y()))
+				
+				{
+			            #ifdef DEBUG
+				    {
+					printf("temps: [ij: %d,%d] [%.3f, %.3f]\n", i, j,
+					       dec_values_T[i].as_double(),
+					       dec_values_T[j].as_double());
+						   
+					printf("dec_values: [%.3f, %.3f] [%.3f,%.3f]\n",
+					       dec_values_X[i].as_double(),
+					       dec_values_Y[i].as_double(),
+					       dec_values_X[j].as_double(),
+					       dec_values_Y[j].as_double());
+					
+					printf("intersect 2: %d [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f] [%.3f,%.3f]\n",
+					       hidden_var_cnt, 				
+					       dec_values_X[i].as_double() + point1.x(), dec_values_Y[i].as_double() + point1.y(),
+					       dec_values_X[i].as_double() + next_point1.x(), dec_values_Y[i].as_double() + next_point1.y(),
+					       dec_values_X[j].as_double() + point2.x(), dec_values_Y[j].as_double() + point2.y(),
+					       dec_values_X[j].as_double() + next_point2.x(), dec_values_Y[j].as_double() + next_point2.y());
+				    }
+			            #endif
+
+				    return false;
+				}
+			    }
+			}
+		    }	    		    
+		}
+		else
+		{
+		    #ifdef DEBUG
+		    {
+			printf("Time collision: %.3f, %.3f\n", dec_values_T[i].as_double(), dec_values_T[j].as_double());
+		    }
+		    #endif
+		    assert(false);
+		}
+	    }
+	}
+    }
+
+    #ifdef DEBUG
+    {
+	printf("Lines DONE !!!\n");
+    }
+    #endif    
+    
+    return true;
+}
+
+
+/*----------------------------------------------------------------*/
+
+void extract_DecisionValuesFromModel(const z3::model     &Model,
+				     const string_map    &dec_var_names_map,
+				     std::vector<double> &dec_values_X,
+				     std::vector<double> &dec_values_Y)
+{
+    for (int i = 0; i < Model.size(); ++i)
+    {
+	double value = Model.get_const_interp(Model[i]).as_double();
+
+	switch (Model[i].name().str()[0])
+	{
+	case 'X':
+	{	    
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());	
+	    if (var_item != dec_var_names_map.end())
+	    {
+		dec_values_X[var_item->second] = value;
+	    }
+	    break;
+	}
+	case 'Y':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());	
+	    if (var_item != dec_var_names_map.end())
+	    {
+		dec_values_Y[var_item->second] = value;
+	    }	    
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+    }
+}
+
+
+void extract_DecisionValuesFromModel(const z3::model     &Model,
+				     z3::context         &Context,				     
+				     const string_map    &dec_var_names_map,
+				     z3::expr_vector     &dec_values_X,
+				     z3::expr_vector     &dec_values_Y)
+{
+    std::map<int, z3::expr*> values_X;
+    std::map<int, z3::expr*> values_Y;
+    
+    for (int i = 0; i < Model.size(); ++i)
+    {
+	z3::expr value = Model.get_const_interp(Model[i]);
+
+	#ifdef DEBUG
+	{	
+	    printf("extracted: %.3f (%s)\n", value.as_double(), Model[i].name().str().c_str());
+	}
+	#endif
+
+	switch (Model[i].name().str()[0])
+	{
+	case 'X':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());
+	    if (var_item != dec_var_names_map.end())
+	    {
+		//printf("saving: %d <-- %.3f, %d, %d\n", var_item->second, value.as_double(), value.numerator().as_int64(), value.denominator().as_int64());
+		values_X[var_item->second] = new z3::expr(Context.real_val(value.numerator().as_int64(), value.denominator().as_int64()));		
+		//dec_values_X[var_item->second] = value;
+		#ifdef DEBUG
+		{	
+		    printf("saved: %.3f\n", values_X[var_item->second]->as_double());
+		}
+		#endif
+	    }
+	    break;
+	}
+	case 'Y':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());	
+	    if (var_item != dec_var_names_map.end())
+	    {
+		//printf("saving: %d <-- %.3f\n", var_item->second, value.as_double());
+
+		values_Y[var_item->second] = new z3::expr(Context.real_val(value.numerator().as_int64(), value.denominator().as_int64()));
+		//dec_values_Y[var_item->second] = value;
+		//printf("saved: %.3f, %.3f\n", values_X[var_item->second]->as_dou
+
+		#ifdef DEBUG
+		{	
+		    printf("saved: %.3f\n", values_Y[var_item->second]->as_double());
+		}
+		#endif
+	    }
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+    }
+
+    dec_values_X.resize(0);
+    dec_values_Y.resize(0);
+
+    for (std::map<int, z3::expr*>::const_iterator value = values_X.begin(); value != values_X.end(); ++value)
+    {
+	dec_values_X.push_back(*value->second);
+	delete value->second;
+    }
+    for (std::map<int, z3::expr*>::const_iterator value = values_Y.begin(); value != values_Y.end(); ++value)
+    {
+	dec_values_Y.push_back(*value->second);
+	delete value->second;
+    }    
+}
+
+
+void extract_DecisionValuesFromModel(const z3::model       &Model,
+				     const string_map      &dec_var_names_map,
+				     std::vector<Rational> &dec_values_X,
+				     std::vector<Rational> &dec_values_Y)
+{
+    for (int i = 0; i < Model.size(); ++i)
+    {
+	z3::expr value = Model.get_const_interp(Model[i]);
+
+	#ifdef DEBUG
+	{	
+	    printf("extracted: %.3f (%s)\n", value.as_double(), Model[i].name().str().c_str());
+	}
+	#endif
+
+	switch (Model[i].name().str()[0])
+	{
+	case 'X':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());
+	    if (var_item != dec_var_names_map.end())
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("saving X: %d <-- %.3f, %ld, %ld\n", var_item->second, value.as_double(), value.numerator().as_int64(), value.denominator().as_int64());
+		}
+		#endif
+		//dec_values_X[var_item->second] = Rational(value.numerator().as_int64(), value.denominator().as_int64());
+		dec_values_X[var_item->second] = Rational(value);
+		//dec_values_X[var_item->second] = value;
+	    }
+	    break;
+	}
+	case 'Y':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());	
+	    if (var_item != dec_var_names_map.end())
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("saving Y: %d <-- %.3f, %ld, %ld\n", var_item->second, value.as_double(), value.numerator().as_int64(), value.denominator().as_int64());
+		}
+		#endif
+		//printf("saving: %d <-- %.3f\n", var_item->second, value.as_double());
+		//dec_values_Y[var_item->second] = Rational(value.numerator().as_int64(), value.denominator().as_int64());
+		dec_values_Y[var_item->second] = Rational(value);
+	    }
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+    }
+}
+
+
+void extract_DecisionValuesFromModel(const z3::model       &Model,
+				     const string_map      &dec_var_names_map,
+				     std::vector<Rational> &dec_values_X,
+				     std::vector<Rational> &dec_values_Y,
+				     std::vector<Rational> &dec_values_T)
+{
+    for (int i = 0; i < Model.size(); ++i)
+    {
+	z3::expr value = Model.get_const_interp(Model[i]);
+        #ifdef DEBUG
+	{	
+	    printf("extracted: %.3f (%s)\n", value.as_double(), Model[i].name().str().c_str());
+	}
+	#endif
+
+	switch (Model[i].name().str()[0])
+	{
+	case 'X':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());
+	    if (var_item != dec_var_names_map.end())
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("saving X: %d <-- %.3f, %ld, %ld\n", var_item->second, value.as_double(), value.numerator().as_int64(), value.denominator().as_int64());
+		}
+		#endif
+		//dec_values_X[var_item->second] = Rational(value.numerator().as_int64(), value.denominator().as_int64());
+		dec_values_X[var_item->second] = Rational(value);
+		//dec_values_X[var_item->second] = value;
+	    }
+	    break;
+	}
+	case 'Y':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());	
+	    if (var_item != dec_var_names_map.end())
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("saving Y: %d <-- %.3f, %ld, %ld\n", var_item->second, value.as_double(), value.numerator().as_int64(), value.denominator().as_int64());
+		}
+		#endif
+		//printf("saving: %d <-- %.3f\n", var_item->second, value.as_double());
+		//dec_values_Y[var_item->second] = Rational(value.numerator().as_int64(), value.denominator().as_int64());
+		dec_values_Y[var_item->second] = Rational(value);
+	    }
+	    break;
+	}
+	case 'T':
+	{
+	    string_map::const_iterator var_item = dec_var_names_map.find(Model[i].name().str());	
+	    if (var_item != dec_var_names_map.end())
+	    {
+		#ifdef DEBUG
+		{	
+		    printf("saving T: %d <-- %.3f, %ld, %ld\n", var_item->second, value.as_double(), value.numerator().as_int64(), value.denominator().as_int64());
+		}
+		#endif
+		//printf("saving: %d <-- %.3f\n", var_item->second, value.as_double());
+		//dec_values_T[var_item->second] = Rational(value.numerator().as_int64(), value.denominator().as_int64());
+		dec_values_T[var_item->second] = Rational(value);
+	    }
+	    break;
+	}	
+	default:
+	{
+	    break;
+	}
+	}
+    }
+}
+
+
+void build_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+				     z3::context                        &Context,
+				     const std::vector<Slic3r::Polygon> &polygons,
+				     z3::expr_vector                    &dec_vars_X,
+				     z3::expr_vector                    &dec_vars_Y,
+				     std::vector<double>                &dec_values_X,
+				     std::vector<double>                &dec_values_Y,
+				     string_map                         &dec_var_names_map)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "X_pos-" + to_string(i);
+	
+	dec_vars_X.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;
+    }
+
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "Y_pos-" + to_string(i);
+	
+	dec_vars_Y.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;	
+    }
+
+    dec_values_X.resize(polygons.size(), 0.0);
+    dec_values_Y.resize(polygons.size(), 0.0);
+
+    introduce_PolygonWeakNonoverlapping(Solver,
+					Context,
+					dec_vars_X,
+					dec_vars_Y,
+					polygons);
+}
+
+
+void build_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+				     z3::context                        &Context,
+				     const std::vector<Slic3r::Polygon> &polygons,
+				     z3::expr_vector                    &dec_vars_X,
+				     z3::expr_vector                    &dec_vars_Y,
+				     z3::expr_vector                    &dec_values_X,
+				     z3::expr_vector                    &dec_values_Y,
+				     string_map                         &dec_var_names_map)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "X_pos-" + to_string(i);
+	
+	dec_vars_X.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;
+    }
+
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "Y_pos-" + to_string(i);
+	
+	dec_vars_Y.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;
+    }
+
+    dec_values_X.resize(polygons.size());
+    dec_values_Y.resize(polygons.size());    
+
+    introduce_PolygonWeakNonoverlapping(Solver,
+					Context,
+					dec_vars_X,
+					dec_vars_Y,
+					polygons);
+}
+
+
+void build_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+				     z3::context                        &Context,
+				     const std::vector<Slic3r::Polygon> &polygons,
+				     z3::expr_vector                    &dec_vars_X,
+				     z3::expr_vector                    &dec_vars_Y,
+				     std::vector<Rational>              &dec_values_X,
+				     std::vector<Rational>              &dec_values_Y,
+				     const std::vector<int>             &fixed,
+				     const std::vector<int>             &undecided,
+				     string_map                         &dec_var_names_map)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "X_pos-" + to_string(i);
+	
+	dec_vars_X.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;
+    }
+
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "Y_pos-" + to_string(i);
+	
+	dec_vars_Y.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;	
+    }
+
+    introduce_PolygonWeakNonoverlapping(Solver,
+					Context,
+					dec_vars_X,
+					dec_vars_Y,
+					dec_values_X,
+					dec_values_Y,
+					fixed,
+					undecided,					
+					polygons);
+}
+
+
+void build_SequentialWeakPolygonNonoverlapping(z3::solver                         &Solver,
+					       z3::context                        &Context,
+					       const std::vector<Slic3r::Polygon> &polygons,
+					       const std::vector<Slic3r::Polygon> &unreachable_polygons,
+					       z3::expr_vector                    &dec_vars_X,
+					       z3::expr_vector                    &dec_vars_Y,
+					       z3::expr_vector                    &dec_vars_T,
+					       std::vector<Rational>              &dec_values_X,
+					       std::vector<Rational>              &dec_values_Y,
+					       std::vector<Rational>              &dec_values_T,
+					       const std::vector<int>             &fixed,
+					       const std::vector<int>             &undecided,
+					       string_map                         &dec_var_names_map)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+
+    build_SequentialWeakPolygonNonoverlapping(Solver,
+					      Context,
+					      polygons,
+					      _unreachable_polygons,
+					      dec_vars_X,
+					      dec_vars_Y,
+					      dec_vars_T,
+					      dec_values_X,
+					      dec_values_Y,
+					      dec_values_T,
+					      fixed,
+					      undecided,
+					      dec_var_names_map);
+}
+
+void build_SequentialWeakPolygonNonoverlapping(z3::solver                                       &Solver,
+					       z3::context                                      &Context,
+					       const std::vector<Slic3r::Polygon>               &polygons,
+					       const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+					       z3::expr_vector                                  &dec_vars_X,
+					       z3::expr_vector                                  &dec_vars_Y,
+					       z3::expr_vector                                  &dec_vars_T,
+					       std::vector<Rational>                            &dec_values_X,
+					       std::vector<Rational>                            &dec_values_Y,
+					       std::vector<Rational>                            &dec_values_T,
+					       const std::vector<int>                           &fixed,
+					       const std::vector<int>                           &undecided,
+					       string_map                                       &dec_var_names_map)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "X_pos-" + to_string(i);
+	
+	dec_vars_X.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;
+    }
+
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "Y_pos-" + to_string(i);
+	
+	dec_vars_Y.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;	
+    }
+
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "T_time-" + to_string(i);
+	
+	dec_vars_T.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;	
+    }
+    
+    introduce_SequentialPolygonWeakNonoverlapping(Solver,
+						  Context,
+						  dec_vars_X,
+						  dec_vars_Y,
+						  dec_vars_T,					
+						  dec_values_X,
+						  dec_values_Y,
+						  dec_values_T,					
+						  fixed,
+						  undecided,					
+						  polygons,
+						  unreachable_polygons);
+}
+
+
+void build_ConsequentialWeakPolygonNonoverlapping(z3::solver                         &Solver,
+						  z3::context                        &Context,
+						  const std::vector<Slic3r::Polygon> &polygons,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons,
+						  z3::expr_vector                    &dec_vars_X,
+						  z3::expr_vector                    &dec_vars_Y,
+						  z3::expr_vector                    &dec_vars_T,
+						  std::vector<Rational>              &dec_values_X,
+						  std::vector<Rational>              &dec_values_Y,
+						  std::vector<Rational>              &dec_values_T,
+						  const std::vector<int>             &fixed,
+						  const std::vector<int>             &undecided,
+						  string_map                         &dec_var_names_map)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+
+    build_ConsequentialWeakPolygonNonoverlapping(Solver,
+						 Context,
+						 polygons,
+						 _unreachable_polygons,
+						 dec_vars_X,
+						 dec_vars_Y,
+						 dec_vars_T,
+						 dec_values_X,
+						 dec_values_Y,
+						 dec_values_T,
+						 fixed,
+						 undecided,
+						 dec_var_names_map);
+}
+
+
+void build_ConsequentialWeakPolygonNonoverlapping(z3::solver                                       &Solver,
+						  z3::context                                      &Context,
+						  const std::vector<Slic3r::Polygon>               &polygons,
+						  const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+						  z3::expr_vector                                  &dec_vars_X,
+						  z3::expr_vector                                  &dec_vars_Y,
+						  z3::expr_vector                                  &dec_vars_T,
+						  std::vector<Rational>                            &dec_values_X,
+						  std::vector<Rational>                            &dec_values_Y,
+						  std::vector<Rational>                            &dec_values_T,
+						  const std::vector<int>                           &fixed,
+						  const std::vector<int>                           &undecided,
+						  string_map                                       &dec_var_names_map)
+{
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "X_pos-" + to_string(i);
+	
+	dec_vars_X.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;
+    }
+
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "Y_pos-" + to_string(i);
+	
+	dec_vars_Y.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;	
+    }
+
+    for (int i = 0; i < polygons.size(); ++i)
+    {
+	string name = "T_time-" + to_string(i);
+	
+	dec_vars_T.push_back(z3::expr(Context.real_const(name.c_str())));
+	dec_var_names_map[name] = i;	
+    }
+    
+    introduce_ConsequentialPolygonWeakNonoverlapping(Solver,
+						     Context,
+						     dec_vars_X,
+						     dec_vars_Y,
+						     dec_vars_T,					
+						     dec_values_X,
+						     dec_values_Y,
+						     dec_values_T,					
+						     fixed,
+						     undecided,					
+						     polygons,
+						     unreachable_polygons);
+}
+
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					std::vector<double>                &dec_values_X,
+					std::vector<double>                &dec_values_Y,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons)
+{
+
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());
+    
+    int last_solvable_bounding_box_size = -1;
+    
+    for (int bounding_box_size = solver_configuration.maximum_bounding_box_size;
+	 bounding_box_size > solver_configuration.minimum_bounding_box_size;
+	 bounding_box_size -= solver_configuration.bounding_box_size_optimization_step)
+    {
+	#ifdef DEBUG
+	{
+	    printf("BB: %d\n", bounding_box_size);
+	}
+	#endif
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	for (int i = 0; i < polygons.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[i], dec_vars_Y[i], polygons[i], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	}
+	    
+	bool sat = false;
+
+	switch (Solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    sat = false;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+	
+	if (sat)
+	{		
+	    z3::model Model(Solver.get_model());
+	    
+	    extract_DecisionValuesFromModel(Model,
+					    dec_var_names_map,
+					    dec_values_X,
+					    dec_values_Y);
+	    
+	    while (true)
+	    {		
+		bool refined = refine_PolygonWeakNonoverlapping(Solver,
+								Context,
+								dec_vars_X,
+								dec_vars_Y,
+								dec_values_X,
+								dec_values_Y,
+								polygons);
+		
+		bool refined_sat = false;
+		
+		if (refined)
+		{
+		    switch (Solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {	    
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			refined_sat = false;
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    
+		    if (refined_sat)
+		    {
+			z3::model Model(Solver.get_model());
+			
+			extract_DecisionValuesFromModel(Model,
+							dec_var_names_map,
+							dec_values_X,
+							dec_values_Y);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < polygons.size(); ++i)
+			    {
+				printf("  %.3f, %.3f\n", dec_values_X[i], dec_values_Y[i]);
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = bounding_box_size;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}		    
+    }
+    if (last_solvable_bounding_box_size > 0)
+    {
+	return true;
+    }
+
+    return false;
+}
+
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					z3::expr_vector                    &dec_values_X,
+					z3::expr_vector                    &dec_values_Y,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons)
+{
+    Z3_global_param_set("timeout", solver_configuration.optimization_timeout.c_str());        
+    int last_solvable_bounding_box_size = -1;
+    
+    for (int bounding_box_size = solver_configuration.maximum_bounding_box_size;
+	 bounding_box_size > solver_configuration.minimum_bounding_box_size;
+	 bounding_box_size -= solver_configuration.bounding_box_size_optimization_step)
+    {
+        #ifdef DEBUG
+	{
+	    printf("BB: %d\n", bounding_box_size);
+	}
+	#endif
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	for (int i = 0; i < polygons.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[i], dec_vars_Y[i], polygons[i], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	}
+	    
+	bool sat = false;
+
+	switch (Solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    sat = false;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+	
+	if (sat)
+	{		
+	    z3::model Model(Solver.get_model());
+	    
+	    extract_DecisionValuesFromModel(Model,
+					    Context,
+					    dec_var_names_map,
+					    dec_values_X,
+					    dec_values_Y);
+	    
+	    while (true)
+	    {		
+		bool refined = refine_PolygonWeakNonoverlapping(Solver,
+								Context,
+								dec_vars_X,
+								dec_vars_Y,
+								dec_values_X,
+								dec_values_Y,
+								polygons);
+		
+		bool refined_sat = false;
+		
+		if (refined)
+		{
+		    switch (Solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {	    
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			refined_sat = false;
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    
+		    if (refined_sat)
+		    {
+			z3::model Model(Solver.get_model());
+			
+			extract_DecisionValuesFromModel(Model,
+							Context,
+							dec_var_names_map,
+							dec_values_X,
+							dec_values_Y);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < polygons.size(); ++i)
+			    {
+				printf("  %.3f, %.3f\n", dec_values_X[i].as_double(), dec_values_Y[i].as_double());
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = bounding_box_size;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}		    
+    }
+    if (last_solvable_bounding_box_size > 0)
+    {
+	return true;
+    }
+
+    return false;
+}
+
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					std::vector<Rational>              &dec_values_X,
+					std::vector<Rational>              &dec_values_Y,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons)
+{
+
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());
+    int last_solvable_bounding_box_size = -1;
+    
+    for (int bounding_box_size = solver_configuration.maximum_bounding_box_size;
+	 bounding_box_size > solver_configuration.minimum_bounding_box_size;
+	 bounding_box_size -= solver_configuration.bounding_box_size_optimization_step)
+    {
+	#ifdef DEBUG
+	{
+	    printf("BB: %d\n", bounding_box_size);
+	}
+	#endif
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	for (int i = 0; i < polygons.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[i], dec_vars_Y[i], polygons[i], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	}
+	    
+	bool sat = false;
+
+	switch (Solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    sat = false;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+	
+	if (sat)
+	{		
+	    z3::model Model(Solver.get_model());
+	    
+	    extract_DecisionValuesFromModel(Model,
+					    dec_var_names_map,
+					    dec_values_X,
+					    dec_values_Y);
+	    
+	    while (true)
+	    {		
+		bool refined = refine_PolygonWeakNonoverlapping(Solver,
+								Context,
+								dec_vars_X,
+								dec_vars_Y,
+								dec_values_X,
+								dec_values_Y,
+								polygons);
+		
+		bool refined_sat = false;
+		
+		if (refined)
+		{
+		    switch (Solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {	    
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			refined_sat = false;
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    
+		    if (refined_sat)
+		    {
+			z3::model Model(Solver.get_model());
+			
+			extract_DecisionValuesFromModel(Model,
+							dec_var_names_map,
+							dec_values_X,
+							dec_values_Y);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < polygons.size(); ++i)
+			    {
+				printf("  %ld/%ld, %ld/%ld\n", dec_values_X[i].numerator, dec_values_X[i].denominator, dec_values_Y[i].numerator, dec_values_Y[i].denominator);
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = bounding_box_size;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}		    
+    }
+    if (last_solvable_bounding_box_size > 0)
+    {
+	return true;
+    }
+
+    return false;
+}
+
+
+/*----------------------------------------------------------------*/
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					z3::expr_vector                    &dec_values_X,
+					z3::expr_vector                    &dec_values_Y,
+					const std::vector<int>             &fixed,
+					const std::vector<int>             &undecided,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons)
+{
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());        
+    int last_solvable_bounding_box_size = -1;
+    
+    for (int bounding_box_size = solver_configuration.maximum_bounding_box_size;
+	 bounding_box_size > solver_configuration.minimum_bounding_box_size;
+	 bounding_box_size -= solver_configuration.bounding_box_size_optimization_step)
+    {
+	#ifdef DEBUG
+	{
+	    printf("BB: %d\n", bounding_box_size);
+	}
+	#endif
+	
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[undecided[i]], dec_vars_Y[undecided[i]], polygons[undecided[i]], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	}
+
+	bool sat = false;
+
+	switch (Solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    sat = false;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+	
+	if (sat)
+	{
+	    z3::model Model(Solver.get_model());
+
+	    extract_DecisionValuesFromModel(Model,
+					    Context,
+					    dec_var_names_map,
+					    dec_values_X,
+					    dec_values_Y);
+	    
+	    while (true)
+	    {
+		bool refined = refine_PolygonWeakNonoverlapping(Solver,
+								Context,
+								dec_vars_X,
+								dec_vars_Y,
+								dec_values_X,
+								dec_values_Y,
+								fixed,
+								undecided,
+								polygons);
+		
+		bool refined_sat = false;
+		
+		if (refined)
+		{
+		    switch (Solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {	    
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			refined_sat = false;
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    
+		    if (refined_sat)
+		    {
+			z3::model Model(Solver.get_model());
+			
+			extract_DecisionValuesFromModel(Model,
+							Context,
+							dec_var_names_map,
+							dec_values_X,
+							dec_values_Y);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < undecided.size(); ++i)
+			    {
+				printf("  %.3f, %.3f\n", dec_values_X[undecided[i]].as_double(), dec_values_Y[undecided[i]].as_double());
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = bounding_box_size;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}		    
+    }
+    if (last_solvable_bounding_box_size > 0)
+    {
+	return true;
+    }
+
+    return false;    
+}
+
+
+bool optimize_WeakPolygonNonoverlapping(z3::solver                         &Solver,
+					z3::context                        &Context,
+					const SolverConfiguration          &solver_configuration,
+					const z3::expr_vector              &dec_vars_X,
+					const z3::expr_vector              &dec_vars_Y,
+					std::vector<Rational>              &dec_values_X,
+					std::vector<Rational>              &dec_values_Y,
+					const std::vector<int>             &fixed,
+					const std::vector<int>             &undecided,
+					const string_map                   &dec_var_names_map,
+					const std::vector<Slic3r::Polygon> &polygons)
+{
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());        
+    int last_solvable_bounding_box_size = -1;
+
+    std::vector<Rational> local_dec_values_X = dec_values_X;
+    std::vector<Rational> local_dec_values_Y = dec_values_Y;    
+    
+    for (int bounding_box_size = solver_configuration.maximum_bounding_box_size;
+	 bounding_box_size > solver_configuration.minimum_bounding_box_size;
+	 bounding_box_size -= solver_configuration.bounding_box_size_optimization_step)
+    {
+	#ifdef DEBUG
+	{
+	    printf("BBX: %d\n", bounding_box_size);
+	}
+	#endif
+	
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[undecided[i]], dec_vars_Y[undecided[i]], polygons[undecided[i]], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	}
+
+	bool sat = false;
+
+	switch (Solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    sat = false;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+	
+	if (sat)
+	{
+	    z3::model Model(Solver.get_model());
+
+	    extract_DecisionValuesFromModel(Model,
+					    dec_var_names_map,
+					    local_dec_values_X,
+					    local_dec_values_Y);
+	    
+	    while (true)
+	    {
+		bool refined = refine_PolygonWeakNonoverlapping(Solver,
+								Context,
+								dec_vars_X,
+								dec_vars_Y,
+								local_dec_values_X,
+								local_dec_values_Y,
+								fixed,
+								undecided,
+								polygons);
+	       
+		
+		if (refined)
+		{
+		    bool refined_sat = false;
+
+		    switch (Solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			refined_sat = false;
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    
+		    if (refined_sat)
+		    {
+			z3::model Model(Solver.get_model());
+			
+			extract_DecisionValuesFromModel(Model,
+							dec_var_names_map,
+							local_dec_values_X,
+							local_dec_values_Y);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < undecided.size(); ++i)
+			    {
+				printf("  %ld/%ld, %ld/%ld\n",
+				       local_dec_values_X[undecided[i]].numerator,
+				       local_dec_values_X[undecided[i]].denominator,
+				       local_dec_values_Y[undecided[i]].numerator,
+				       local_dec_values_Y[undecided[i]].denominator);
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = bounding_box_size;
+
+		    dec_values_X = local_dec_values_X;
+		    dec_values_Y = local_dec_values_Y;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}		    
+    }
+    if (last_solvable_bounding_box_size > 0)
+    {
+	return true;
+    }
+
+    return false;    
+}
+
+
+
+bool optimize_SequentialWeakPolygonNonoverlapping(z3::solver                         &Solver,
+						  z3::context                        &Context,
+						  const SolverConfiguration          &solver_configuration,
+						  const z3::expr_vector              &dec_vars_X,
+						  const z3::expr_vector              &dec_vars_Y,
+						  const z3::expr_vector              &dec_vars_T,
+						  std::vector<Rational>              &dec_values_X,
+						  std::vector<Rational>              &dec_values_Y,
+						  std::vector<Rational>              &dec_values_T,
+						  const std::vector<int>             &fixed,
+						  const std::vector<int>             &undecided,
+						  const string_map                   &dec_var_names_map,
+						  const std::vector<Slic3r::Polygon> &polygons,
+						  const std::vector<Slic3r::Polygon> &unreachable_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }    
+    
+    return optimize_SequentialWeakPolygonNonoverlapping(Solver,
+							Context,
+							solver_configuration,
+							dec_vars_X,
+							dec_vars_Y,
+							dec_vars_T,
+							dec_values_X,
+							dec_values_Y,
+							dec_values_T,
+							fixed,
+							undecided,
+							dec_var_names_map,
+							polygons,
+							_unreachable_polygons);
+}
+
+
+bool optimize_SequentialWeakPolygonNonoverlapping(z3::solver                                       &Solver,
+						  z3::context                                      &Context,
+						  const SolverConfiguration                        &solver_configuration,
+						  const z3::expr_vector                            &dec_vars_X,
+						  const z3::expr_vector                            &dec_vars_Y,
+						  const z3::expr_vector                            &dec_vars_T,
+						  std::vector<Rational>                            &dec_values_X,
+						  std::vector<Rational>                            &dec_values_Y,
+						  std::vector<Rational>                            &dec_values_T,
+						  const std::vector<int>                           &fixed,
+						  const std::vector<int>                           &undecided,
+						  const string_map                                 &dec_var_names_map,
+						  const std::vector<Slic3r::Polygon>               &polygons,
+						  const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());    
+    //z3::set_param("parallel.enable", "true");
+    
+    int last_solvable_bounding_box_size = -1;
+
+    std::vector<Rational> local_dec_values_X = dec_values_X;
+    std::vector<Rational> local_dec_values_Y = dec_values_Y;
+    std::vector<Rational> local_dec_values_T = dec_values_T;        
+    
+    for (int bounding_box_size = solver_configuration.maximum_bounding_box_size;
+	 bounding_box_size > solver_configuration.minimum_bounding_box_size;
+	 bounding_box_size -= solver_configuration.bounding_box_size_optimization_step)
+    {
+	#ifdef DEBUG
+	{
+	    printf("BBX: %d\n", bounding_box_size);
+	}
+	#endif
+	
+	//Solver.reset();
+	
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[undecided[i]], dec_vars_Y[undecided[i]], polygons[undecided[i]], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	}
+
+	bool sat = false;
+
+//	Solver.add(bounding_box_assumptions);
+
+	#ifdef DEBUG
+	{
+	    printf("Solving 11 ...\n");
+	}
+	#endif
+	
+	switch (Solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    sat = false;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}	
+	#ifdef DEBUG
+	{
+	    printf("Solving 11 ... finished\n");
+	}
+	#endif
+	
+	if (sat)
+	{
+	    #ifdef DEBUG
+	    {
+		printf("First SAT\n");
+	    }
+	    #endif
+	    z3::model Model(Solver.get_model());
+
+	    extract_DecisionValuesFromModel(Model,
+					    dec_var_names_map,
+					    local_dec_values_X,
+					    local_dec_values_Y,
+					    local_dec_values_T);
+
+	    while (true)
+	    {
+		bool refined = refine_SequentialPolygonWeakNonoverlapping(Solver,
+									  Context,
+									  dec_vars_X,
+									  dec_vars_Y,
+									  dec_vars_T,
+									  local_dec_values_X,
+									  local_dec_values_Y,
+									  local_dec_values_T,
+									  fixed,
+									  undecided,
+									  polygons,
+									  unreachable_polygons);
+	       
+		
+		if (refined)
+		{
+		    bool refined_sat = false;
+
+		    #ifdef DEBUG
+		    {
+			printf("Solving 12 ...\n");
+		    }
+		    #endif
+		    
+		    switch (Solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			refined_sat = false;
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    #ifdef DEBUG
+		    {
+			printf("Solving 12 ... finished: %d\n", refined_sat);
+		    }
+		    #endif
+
+		    /*
+		    printf("Printing solver status:\n");
+		    cout << Solver << "\n";
+		    */
+		    		    
+		    if (refined_sat)
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined SAT\n");
+			}
+			#endif
+			z3::model Model(Solver.get_model());
+
+			/*
+			printf("Printing smt status:\n");
+			cout << Solver.to_smt2() << "\n";	    			
+			*/
+			
+			extract_DecisionValuesFromModel(Model,
+							dec_var_names_map,
+							local_dec_values_X,
+							local_dec_values_Y,
+							local_dec_values_T);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < undecided.size(); ++i)
+			    {
+				printf("  i:%d, undecided[i]:%d: %ld/%ld (%.3f), %ld/%ld (%.3f) [%ld/%ld (%.3f)]\n",
+				       i, undecided[i],
+				       local_dec_values_X[undecided[i]].numerator,
+				       local_dec_values_X[undecided[i]].denominator,
+				       local_dec_values_X[undecided[i]].as_double(),  
+				       local_dec_values_Y[undecided[i]].numerator,
+				       local_dec_values_Y[undecided[i]].denominator,
+				       local_dec_values_Y[undecided[i]].as_double(),				       
+				       local_dec_values_T[undecided[i]].numerator,
+				       local_dec_values_T[undecided[i]].denominator,
+				       local_dec_values_T[undecided[i]].as_double());
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined UNSAT\n");
+			}
+			#endif
+			if (last_solvable_bounding_box_size > 0)
+			{
+			    return true;
+			}
+			else
+			{
+			    return false;
+			}
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = bounding_box_size;
+
+		    dec_values_X = local_dec_values_X;
+		    dec_values_Y = local_dec_values_Y;
+		    dec_values_T = local_dec_values_T;		    
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    #ifdef DEBUG
+	    {
+		printf("First UNSAT\n");
+	    }
+	    #endif
+	    if (last_solvable_bounding_box_size > 0)
+	    {
+		return true;
+	    }
+	    else
+	    {
+		return false;
+	    }
+	}		    
+    }
+    return false;
+}
+
+
+bool optimize_SequentialWeakPolygonNonoverlappingCentered(z3::solver                                       &Solver,
+							  z3::context                                      &Context,
+							  const SolverConfiguration                        &solver_configuration,
+							  const z3::expr_vector                            &dec_vars_X,
+							  const z3::expr_vector                            &dec_vars_Y,
+							  const z3::expr_vector                            &dec_vars_T,
+							  std::vector<Rational>                            &dec_values_X,
+							  std::vector<Rational>                            &dec_values_Y,
+							  std::vector<Rational>                            &dec_values_T,
+							  const std::vector<int>                           &fixed,
+							  const std::vector<int>                           &undecided,
+							  const string_map                                 &dec_var_names_map,
+							  const std::vector<Slic3r::Polygon>               &polygons,
+							  const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());    
+    //z3::set_param("parallel.enable", "true");
+    
+    int last_solvable_bounding_box_size = -1;
+
+    std::vector<Rational> local_dec_values_X = dec_values_X;
+    std::vector<Rational> local_dec_values_Y = dec_values_Y;
+    std::vector<Rational> local_dec_values_T = dec_values_T;        
+
+    int box_min_x = 0;
+    int box_max_x = solver_configuration.maximum_X_bounding_box_size;
+    int box_min_y = 0;
+    int box_max_y = solver_configuration.maximum_Y_bounding_box_size;
+    
+    while (box_min_x < box_max_x && box_min_y < box_max_y)
+    {
+	#ifdef DEBUG
+	{
+	    printf("BBX: %d, %d, %d, %d\n", box_min_x, box_max_x, box_min_y, box_max_y);
+	}
+	#endif
+	
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[undecided[i]],
+				   dec_vars_Y[undecided[i]],
+				   polygons[undecided[i]],
+				   box_min_x,
+				   box_min_y,
+				   box_max_x,
+				   box_max_y,
+				   bounding_box_assumptions);
+	}
+
+	bool sat = false;
+
+	#ifdef DEBUG
+	{
+	    printf("Solving 11 ...\n");
+	}
+	#endif
+//	Solver.add(bounding_box_assumptions);
+	
+	switch (Solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    sat = false;
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+	
+	if (sat)
+	{
+	    #ifdef DEBUG
+	    {
+		printf("First SAT\n");
+	    }
+	    #endif
+	    z3::model Model(Solver.get_model());
+
+	    extract_DecisionValuesFromModel(Model,
+					    dec_var_names_map,
+					    local_dec_values_X,
+					    local_dec_values_Y,
+					    local_dec_values_T);
+
+	    while (true)
+	    {
+		bool refined = refine_SequentialPolygonWeakNonoverlapping(Solver,
+									  Context,
+									  dec_vars_X,
+									  dec_vars_Y,
+									  dec_vars_T,
+									  local_dec_values_X,
+									  local_dec_values_Y,
+									  local_dec_values_T,
+									  fixed,
+									  undecided,
+									  polygons,
+									  unreachable_polygons);
+	       
+		
+		if (refined)
+		{
+		    bool refined_sat = false;
+
+		    #ifdef DEBUG
+		    {
+			printf("Solving 12 ...\n");
+		    }
+		    #endif
+
+		    /*
+		    z3::check_result result = Solver.check(bounding_box_assumptions);
+		    printf("check_result: %d\n", result);
+		    */
+		    switch (Solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			refined_sat = false;
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+
+                    #ifdef DEBUG
+		    {
+			printf("Solving 12 ... finished: %d\n", refined_sat);
+		    }
+		    #endif
+
+		    /*
+		    printf("Printing solver status:\n");
+		    cout << Solver << "\n";
+		    */
+		    		    
+		    if (refined_sat)
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined SAT\n");
+			}
+			#endif
+			z3::model Model(Solver.get_model());
+
+			/*
+			printf("Printing smt status:\n");
+			cout << Solver.to_smt2() << "\n";	    			
+			*/
+			
+			extract_DecisionValuesFromModel(Model,
+							dec_var_names_map,
+							local_dec_values_X,
+							local_dec_values_Y,
+							local_dec_values_T);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < undecided.size(); ++i)
+			    {
+				printf("  i:%d, undecided[i]:%d: %ld/%ld (%.3f), %ld/%ld (%.3f) [%ld/%ld (%.3f)]\n",
+				       i, undecided[i],
+				       local_dec_values_X[undecided[i]].numerator,
+				       local_dec_values_X[undecided[i]].denominator,
+				       local_dec_values_X[undecided[i]].as_double(),  
+				       local_dec_values_Y[undecided[i]].numerator,
+				       local_dec_values_Y[undecided[i]].denominator,
+				       local_dec_values_Y[undecided[i]].as_double(),				       
+				       local_dec_values_T[undecided[i]].numerator,
+				       local_dec_values_T[undecided[i]].denominator,
+				       local_dec_values_T[undecided[i]].as_double());
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined UNSAT\n");
+			}
+			#endif
+			if (last_solvable_bounding_box_size > 0)
+			{
+			    return true;
+			}
+			else
+			{
+			    return false;
+			}
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = box_max_x;
+
+		    dec_values_X = local_dec_values_X;
+		    dec_values_Y = local_dec_values_Y;
+		    dec_values_T = local_dec_values_T;		    
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    #ifdef DEBUG
+	    {
+		printf("First UNSAT\n");
+	    }
+	    #endif
+	    if (last_solvable_bounding_box_size > 0)
+	    {
+		return true;
+	    }
+	    else
+	    {
+		return false;
+	    }
+	}
+
+
+	box_min_x += solver_configuration.bounding_box_size_optimization_step;
+	box_max_x -= solver_configuration.bounding_box_size_optimization_step;	
+	
+	box_min_y += solver_configuration.bounding_box_size_optimization_step;
+	box_max_y -= solver_configuration.bounding_box_size_optimization_step;
+
+	if (box_min_x >= box_max_x || box_min_y >= box_max_y)
+	{
+	    break;
+	}	
+    }
+    return false;
+}
+
+
+bool checkArea_SequentialWeakPolygonNonoverlapping(coord_t                                           box_min_x,
+						   coord_t                                           box_min_y,
+						   coord_t                                           box_max_x,
+						   coord_t                                           box_max_y,
+						   const std::vector<int>                           &fixed,
+						   const std::vector<int>                           &undecided,
+						   const std::vector<Slic3r::Polygon>               &polygons,
+						   const std::vector<std::vector<Slic3r::Polygon> > &SEQ_UNUSED(unreachable_polygons))
+{
+
+    double check_area = (box_max_x - box_min_x) * (box_max_y - box_min_y);
+    double polygon_area = calc_PolygonArea(fixed, undecided, polygons);
+
+    #ifdef DEBUG
+    {
+	printf("Fast checkging for box: %d, %d, %d, %d\n", box_min_x, box_min_y, box_max_x, box_max_y);    
+	printf("Check area: %.3f\n", check_area);
+	printf("Polygon area: %.3f\n", polygon_area);
+    }
+    #endif
+    
+    if (check_area < polygon_area)
+    {
+	return false;
+    }
+    
+    return true;
+}
+
+
+bool checkExtens_SequentialWeakPolygonNonoverlapping(coord_t                                           box_min_x,
+						     coord_t                                           box_min_y,
+						     coord_t                                           box_max_x,
+						     coord_t                                           box_max_y,
+						     std::vector<Rational>                            &dec_values_X,
+						     std::vector<Rational>                            &dec_values_Y,
+						     const std::vector<int>                           &fixed,
+						     const std::vector<int>                           &undecided,
+						     const std::vector<Slic3r::Polygon>               &polygons,
+						     const std::vector<std::vector<Slic3r::Polygon> > &SEQ_UNUSED(unreachable_polygons))
+{
+    double min_X, max_X, min_Y, max_Y;
+
+    if (!fixed.empty())
+    {
+	BoundingBox polygon_box = get_extents(polygons[fixed[0]]);
+		    
+	min_X = dec_values_X[fixed[0]].as_double() + polygon_box.min.x();
+	min_Y = dec_values_Y[fixed[0]].as_double() + polygon_box.min.y();
+	
+	max_X = dec_values_X[fixed[0]].as_double() + polygon_box.max.x();
+	max_Y = dec_values_Y[fixed[0]].as_double() + polygon_box.max.y();		    
+    
+	for (int i = 1; i < fixed.size(); ++i)
+	{	
+	    BoundingBox polygon_box = get_extents(polygons[fixed[i]]);
+
+	    double next_min_X = dec_values_X[fixed[i]].as_double() + polygon_box.min.x();
+			
+	    if (next_min_X < min_X)
+	    {
+		min_X = next_min_X;
+	    }
+	    double next_min_Y = dec_values_Y[fixed[i]].as_double() + polygon_box.min.y();
+
+	    if (next_min_Y < min_Y)
+	    {
+		min_Y = next_min_Y;
+	    }
+
+	    double next_max_X = dec_values_X[fixed[i]].as_double() + polygon_box.max.x();
+
+	    if (next_max_X > max_X)
+	    {
+		max_X = next_max_X;
+	    }	    
+	    double next_max_Y = dec_values_Y[fixed[i]].as_double() + polygon_box.max.y();
+
+	    if (next_max_Y > max_Y)
+	    {
+		max_Y = next_max_Y;
+	    }	    	    
+	}
+	
+	#ifdef DEBUG
+	{
+	    printf("Box:%d,%d,%d,%d\n", box_min_x, box_max_x, box_min_y, box_max_y);
+	    printf("Fix:%.3f,%.3f,%.3f,%.3f\n", min_X, max_X, min_Y, max_Y);
+	}
+	#endif
+	
+	if (min_X < box_min_x || max_X > box_max_x || min_Y < box_min_y || max_Y > box_max_y)
+	{
+	    return false;
+	}
+    }
+    return true;
+}
+
+
+bool optimize_SequentialWeakPolygonNonoverlappingBinaryCentered(z3::solver                                       &Solver,
+								z3::context                                      &Context,
+								const SolverConfiguration                        &solver_configuration,
+								coord_t                                          &box_half_x_max,
+								coord_t                                          &box_half_y_max,
+								const z3::expr_vector                            &dec_vars_X,
+								const z3::expr_vector                            &dec_vars_Y,
+								const z3::expr_vector                            &dec_vars_T,
+								std::vector<Rational>                            &dec_values_X,
+								std::vector<Rational>                            &dec_values_Y,
+								std::vector<Rational>                            &dec_values_T,
+								const std::vector<int>                           &fixed,
+								const std::vector<int>                           &undecided,
+								const string_map                                 &dec_var_names_map,
+								const std::vector<Slic3r::Polygon>               &polygons,
+								const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons)
+{
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());    
+    //z3::set_param("parallel.enable", "true");
+    
+    coord_t last_solvable_bounding_box_size = -1;
+
+    std::vector<Rational> local_dec_values_X = dec_values_X;
+    std::vector<Rational> local_dec_values_Y = dec_values_Y;
+    std::vector<Rational> local_dec_values_T = dec_values_T;        
+
+    coord_t half_x_min = 0;
+    coord_t half_x_max = box_half_x_max; //solver_configuration.maximum_X_bounding_box_size / 2;
+
+    coord_t half_y_min = 0;
+    coord_t half_y_max = box_half_y_max; //solver_configuration.maximum_Y_bounding_box_size / 2;	
+
+    while ((half_x_max - half_x_min) > 1 && (half_y_max - half_y_min) > 1)
+    {
+	#ifdef DEBUG
+	{
+	    printf("Halves: %d, %d, %d, %d\n", half_x_min, half_x_max, half_y_min, half_y_max);
+	}
+	#endif
+
+	bool size_solvable = false;
+	
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	coord_t box_min_x = (half_x_max + half_x_min) / 2;
+	coord_t box_max_x = solver_configuration.maximum_X_bounding_box_size - box_min_x;
+	coord_t box_min_y = (half_y_max + half_y_min) / 2;
+	coord_t box_max_y = solver_configuration.maximum_Y_bounding_box_size - box_min_y;
+
+	#ifdef DEBUG
+	{
+	    printf("BBX: %d, %d, %d, %d\n", box_min_x, box_max_x, box_min_y, box_max_y);
+	}
+	#endif
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[undecided[i]],
+				  dec_vars_Y[undecided[i]],
+				  polygons[undecided[i]],
+				  box_min_x,
+				  box_min_y,
+				  box_max_x,
+				  box_max_y,
+				  bounding_box_assumptions);
+	}	
+
+	bool sat = false;
+
+	#ifdef DEBUG
+	{
+	    printf("Solving 11 ...\n");
+	}
+	#endif
+//	Solver.add(bounding_box_assumptions);
+
+	if (checkArea_SequentialWeakPolygonNonoverlapping(box_min_x,
+							  box_min_y,
+							  box_max_x,
+							  box_max_y,
+							  fixed,
+							  undecided,	       
+							  polygons,
+							  unreachable_polygons))
+	{
+	    switch (Solver.check(bounding_box_assumptions))
+	    {
+	    case z3::sat:
+	    {
+		sat = true;	    
+		break;
+	    }
+	    case z3::unsat:	
+	    {
+		sat = false;	    
+		break;
+	    }
+	    case z3::unknown:
+	    {
+		sat = false;
+		break;
+	    }
+	    default:
+	    {
+		break;
+	    }
+	    }
+	}
+	else
+	{
+	    sat = false;
+	}
+
+	if (sat)
+	{
+	    #ifdef DEBUG
+	    {
+		printf("First SAT\n");
+	    }
+	    #endif
+	    z3::model Model(Solver.get_model());
+
+	    extract_DecisionValuesFromModel(Model,
+					    dec_var_names_map,
+					    local_dec_values_X,
+					    local_dec_values_Y,
+					    local_dec_values_T);
+
+	    while (true)
+	    {
+		bool refined = refine_SequentialPolygonWeakNonoverlapping(Solver,
+									  Context,
+									  dec_vars_X,
+									  dec_vars_Y,
+									  dec_vars_T,
+									  local_dec_values_X,
+									  local_dec_values_Y,
+									  local_dec_values_T,
+									  fixed,
+									  undecided,
+									  polygons,
+									  unreachable_polygons);
+		
+		if (refined)
+		{
+		    bool refined_sat = false;
+
+		    #ifdef DEBUG
+		    {
+			printf("Solving 12 ...\n");
+		    }
+		    #endif
+
+		    if (checkArea_SequentialWeakPolygonNonoverlapping(box_min_x,
+								      box_min_y,
+								      box_max_x,
+								      box_max_y,
+								      fixed,
+								      undecided,	       
+								      polygons,
+								      unreachable_polygons))
+		    {
+			switch (Solver.check(bounding_box_assumptions))
+			{
+			case z3::sat:
+			{
+			    refined_sat = true;	    
+			    break;
+			}
+			case z3::unsat:	
+			{
+			    refined_sat = false;	    
+			    break;
+			}
+			case z3::unknown:
+			{
+			    refined_sat = false;
+			    break;
+			}
+			default:
+			{
+			    break;
+			}
+			}
+		    }
+		    else
+		    {
+			refined_sat = false;
+		    }
+		    
+		    #ifdef DEBUG
+		    {
+			printf("Solving 12 ... finished: %d\n", refined_sat);
+		    }
+		    #endif
+
+		    /*
+		    printf("Printing solver status:\n");
+		    cout << Solver << "\n";
+		    */
+		    		    
+		    if (refined_sat)
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined SAT\n");
+			}
+			#endif
+			z3::model Model(Solver.get_model());
+
+			/*
+			printf("Printing smt status:\n");
+			cout << Solver.to_smt2() << "\n";	    			
+			*/
+			
+			extract_DecisionValuesFromModel(Model,
+							dec_var_names_map,
+							local_dec_values_X,
+							local_dec_values_Y,
+							local_dec_values_T);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < undecided.size(); ++i)
+			    {
+				printf("  i:%d, undecided[i]:%d: %ld/%ld (%.3f), %ld/%ld (%.3f) [%ld/%ld (%.3f)]\n",
+				       i, undecided[i],
+				       local_dec_values_X[undecided[i]].numerator,
+				       local_dec_values_X[undecided[i]].denominator,
+				       local_dec_values_X[undecided[i]].as_double(),  
+				       local_dec_values_Y[undecided[i]].numerator,
+				       local_dec_values_Y[undecided[i]].denominator,
+				       local_dec_values_Y[undecided[i]].as_double(),				       
+				       local_dec_values_T[undecided[i]].numerator,
+				       local_dec_values_T[undecided[i]].denominator,
+				       local_dec_values_T[undecided[i]].as_double());
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined UNSAT\n");
+			}
+			#endif
+			size_solvable = false;
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = box_max_x;
+
+		    dec_values_X = local_dec_values_X;
+		    dec_values_Y = local_dec_values_Y;
+		    dec_values_T = local_dec_values_T;		    
+
+		    size_solvable = true;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+            #ifdef DEBUG
+	    {
+		printf("First UNSAT\n");
+	    }
+	    #endif
+	    
+	    if (last_solvable_bounding_box_size > 0)
+	    {
+		size_solvable = false;
+	    }
+	    else
+	    {
+		size_solvable = false;		
+	    }
+	}
+
+	coord_t half_x_med = (half_x_max + half_x_min) / 2;
+	coord_t half_y_med = (half_y_max + half_y_min) / 2;
+		    
+	if (size_solvable)
+	{
+	    #ifdef DEBUG
+	    {
+		printf("Solvable\n");
+	    }
+	    #endif
+	    half_x_min = half_x_med;
+	    half_y_min = half_y_med;	    
+	}
+	else
+	{
+	    #ifdef DEBUG
+	    {
+		printf("Unsolvable\n");
+	    }
+	    #endif
+	    half_x_max = half_x_med;
+	    half_y_max = half_y_med;	    
+	}
+	#ifdef DEBUG
+	{
+	    printf("Halves augmented: X:[%d,%d] Y:[%d,%d]\n", half_x_min, half_x_max, half_y_min, half_y_max);
+	}
+	#endif       
+    }
+   
+    if (last_solvable_bounding_box_size > 0)
+    {
+	box_half_x_max = half_x_max;
+	box_half_y_max = half_y_max;
+	
+	return true;
+    }    
+    return false;
+}
+
+
+#ifdef PROFILE
+double init_cumul = 0.0;
+clock_t init_start, init_finish;
+
+double refine_cumul = 0.0;
+clock_t refine_start, refine_finish;
+
+double recheck_SAT_cumul = 0.0;
+double recheck_UNSAT_cumul = 0.0;
+double recheck_INDET_cumul = 0.0;
+clock_t recheck_start, recheck_finish;
+#endif
+
+bool optimize_ConsequentialWeakPolygonNonoverlappingBinaryCentered(z3::solver                                       &Solver,
+								   z3::context                                      &Context,
+								   const SolverConfiguration                        &solver_configuration,
+								   coord_t                                          &box_half_x_max,
+								   coord_t                                          &box_half_y_max,
+								   const z3::expr_vector                            &dec_vars_X,
+								   const z3::expr_vector                            &dec_vars_Y,
+								   const z3::expr_vector                            &dec_vars_T,
+								   std::vector<Rational>                            &dec_values_X,
+								   std::vector<Rational>                            &dec_values_Y,
+								   std::vector<Rational>                            &dec_values_T,
+								   const std::vector<int>                           &fixed,
+								   const std::vector<int>                           &undecided,
+								   const string_map                                 &dec_var_names_map,
+								   const std::vector<Slic3r::Polygon>               &polygons,
+								   const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+								   const z3::expr_vector                            &presence_constraints)
+{
+    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());    
+    //z3::set_param("parallel.enable", "true");
+    
+    coord_t last_solvable_bounding_box_size = -1;
+
+    std::vector<Rational> local_dec_values_X = dec_values_X;
+    std::vector<Rational> local_dec_values_Y = dec_values_Y;
+    std::vector<Rational> local_dec_values_T = dec_values_T;        
+
+    coord_t half_x_min = 0;
+    coord_t half_x_max = box_half_x_max; //solver_configuration.maximum_X_bounding_box_size / 2;
+
+    coord_t half_y_min = 0;
+    coord_t half_y_max = box_half_y_max; //solver_configuration.maximum_Y_bounding_box_size / 2;	
+            
+    while ((half_x_max - half_x_min) > 1 && (half_y_max - half_y_min) > 1)
+    {
+	#ifdef DEBUG
+	{
+	    printf("Halves: %d, %d, %d, %d\n", half_x_min, half_x_max, half_y_min, half_y_max);
+	}
+	#endif
+
+	bool size_solvable = false;
+	
+	z3::expr_vector bounding_box_assumptions(Context);
+
+	coord_t box_min_x = (half_x_max + half_x_min) / 2;
+	coord_t box_max_x = solver_configuration.maximum_X_bounding_box_size - box_min_x;
+	coord_t box_min_y = (half_y_max + half_y_min) / 2;
+	coord_t box_max_y = solver_configuration.maximum_Y_bounding_box_size - box_min_y;
+
+	#ifdef DEBUG
+	{
+	    printf("BBX: %d, %d, %d, %d\n", box_min_x, box_max_x, box_min_y, box_max_y);
+	}
+	#endif
+
+	z3::expr_vector	complete_assumptions(Context);
+
+	for (int i = 0; i < presence_constraints.size(); ++i)
+	{
+	    complete_assumptions.push_back(presence_constraints[i]);
+	}
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    assume_BedBoundingBox(dec_vars_X[undecided[i]],
+				  dec_vars_Y[undecided[i]],
+				  polygons[undecided[i]],
+				  box_min_x,
+				  box_min_y,
+				  box_max_x,
+				  box_max_y,
+				  complete_assumptions);
+	}	
+
+	bool sat = false;
+
+	#ifdef DEBUG
+	{
+	    printf("Solving 11 ...\n");
+	}
+	#endif
+
+	if (checkArea_SequentialWeakPolygonNonoverlapping(box_min_x,
+							  box_min_y,
+							  box_max_x,
+							  box_max_y,
+							  fixed,
+							  undecided,	       
+							  polygons,
+							  unreachable_polygons))
+	{
+	    #ifdef PROFILE
+	    {
+		init_start = clock();
+	    }
+	    #endif
+	    
+	    switch (Solver.check(complete_assumptions))
+	    {
+	    case z3::sat:
+	    {
+		sat = true;	    
+		break;
+	    }
+	    case z3::unsat:	
+	    {
+		sat = false;	    
+		break;
+	    }
+	    case z3::unknown:
+	    {
+		sat = false;
+		break;
+	    }
+	    default:
+	    {
+		break;
+	    }
+	    }
+
+	    #ifdef PROFILE
+	    {
+		init_finish = clock();
+		init_cumul += (init_finish - init_start) / (double)CLOCKS_PER_SEC;
+	    }
+	    #endif
+	}
+	else
+	{
+	    sat = false;
+	}
+
+	if (sat)
+	{
+	    #ifdef DEBUG
+	    {
+		printf("First SAT\n");
+	    }
+	    #endif
+	    z3::model Model(Solver.get_model());
+
+	    extract_DecisionValuesFromModel(Model,
+					    dec_var_names_map,
+					    local_dec_values_X,
+					    local_dec_values_Y,
+					    local_dec_values_T);
+
+	    while (true)
+	    {
+		#ifdef PROFILE
+		{
+		    refine_start = clock();
+		}
+		#endif
+		bool refined = refine_ConsequentialPolygonWeakNonoverlapping(Solver,
+									     Context,
+									     dec_vars_X,
+									     dec_vars_Y,
+									     dec_vars_T,
+									     local_dec_values_X,
+									     local_dec_values_Y,
+									     local_dec_values_T,
+									     fixed,
+									     undecided,
+									     polygons,
+									     unreachable_polygons);
+		#ifdef PROFILE
+		{
+		    refine_finish = clock();
+		    refine_cumul += (refine_finish - refine_start) / (double)CLOCKS_PER_SEC;
+		}
+		#endif
+	       
+		if (refined)
+		{
+		    bool refined_sat = false;
+
+		    #ifdef DEBUG
+		    {
+			printf("Solving 12 ...\n");
+		    }
+		    #endif
+
+		    if (checkArea_SequentialWeakPolygonNonoverlapping(box_min_x,
+								      box_min_y,
+								      box_max_x,
+								      box_max_y,
+								      fixed,
+								      undecided,	       
+								      polygons,
+								      unreachable_polygons))
+		    {
+			#ifdef PROFILE
+			{
+			    recheck_start = clock();
+			}
+			#endif
+			    
+			switch (Solver.check(complete_assumptions))
+			{
+			case z3::sat:
+			{
+			    #ifdef PROFILE
+			    {
+				recheck_finish = clock();
+				recheck_SAT_cumul += (recheck_finish - recheck_start) / (double)CLOCKS_PER_SEC;
+			    }
+			    #endif
+			    
+			    refined_sat = true;	    
+			    break;
+			}
+			case z3::unsat:	
+			{
+			    #ifdef PROFILE
+			    {			    
+				recheck_finish = clock();
+				recheck_UNSAT_cumul += (recheck_finish - recheck_start) / (double)CLOCKS_PER_SEC;
+			    }
+			    #endif
+			    refined_sat = false;	    
+			    break;
+			}
+			case z3::unknown:
+			{
+                            #ifdef PROFILE
+			    {
+				recheck_finish = clock();
+				recheck_INDET_cumul += (recheck_finish - recheck_start) / (double)CLOCKS_PER_SEC;
+			    }
+			    #endif			    
+			    refined_sat = false;
+			    break;
+			}
+			default:
+			{
+			    break;
+			}
+			}
+		    }
+		    else
+		    {
+			refined_sat = false;
+		    }
+		    
+		    #ifdef DEBUG
+		    {
+			printf("Solving 12 ... finished: %d\n", refined_sat);
+		    }
+		    #endif
+
+		    /*
+		    printf("Printing solver status:\n");
+		    cout << Solver << "\n";
+		    */
+		    		    
+		    if (refined_sat)
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined SAT\n");
+			}
+			#endif
+			z3::model Model(Solver.get_model());
+
+			/*
+			printf("Printing smt status:\n");
+			cout << Solver.to_smt2() << "\n";	    			
+			*/
+
+			extract_DecisionValuesFromModel(Model,
+							dec_var_names_map,
+							local_dec_values_X,
+							local_dec_values_Y,
+							local_dec_values_T);
+
+                        #ifdef DEBUG
+			{
+			    printf("Refined positions:\n");
+			    for (int i = 0; i < undecided.size(); ++i)
+			    {
+				printf("  i:%d, undecided[i]:%d: %ld/%ld (%.3f), %ld/%ld (%.3f) [%ld/%ld (%.3f)]\n",
+				       i, undecided[i],
+				       local_dec_values_X[undecided[i]].numerator,
+				       local_dec_values_X[undecided[i]].denominator,
+				       local_dec_values_X[undecided[i]].as_double(),  
+				       local_dec_values_Y[undecided[i]].numerator,
+				       local_dec_values_Y[undecided[i]].denominator,
+				       local_dec_values_Y[undecided[i]].as_double(),				       
+				       local_dec_values_T[undecided[i]].numerator,
+				       local_dec_values_T[undecided[i]].denominator,
+				       local_dec_values_T[undecided[i]].as_double());
+			    }
+			}
+			#endif
+		    }
+		    else
+		    {
+			#ifdef DEBUG
+			{
+			    printf("Refined UNSAT\n");
+			}
+			#endif
+			size_solvable = false;
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = box_max_x;
+
+		    dec_values_X = local_dec_values_X;
+		    dec_values_Y = local_dec_values_Y;
+		    dec_values_T = local_dec_values_T;		    
+
+		    size_solvable = true;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+            #ifdef DEBUG
+	    {
+		printf("First UNSAT\n");
+	    }
+	    #endif
+	    
+	    if (last_solvable_bounding_box_size > 0)
+	    {
+		size_solvable = false;
+	    }
+	    else
+	    {
+		size_solvable = false;		
+	    }
+	}
+
+	coord_t half_x_med = (half_x_max + half_x_min) / 2;
+	coord_t half_y_med = (half_y_max + half_y_min) / 2;
+		    
+	if (size_solvable)
+	{
+	    #ifdef DEBUG
+	    {
+		printf("Solvable\n");
+	    }
+	    #endif
+	    half_x_min = half_x_med;
+	    half_y_min = half_y_med;	    
+	}
+	else
+	{
+	    #ifdef DEBUG
+	    {
+		printf("Unsolvable\n");
+	    }
+	    #endif
+	    half_x_max = half_x_med;
+	    half_y_max = half_y_med;	    
+	}
+	#ifdef DEBUG
+	{
+	    printf("Halves augmented: X:[%d,%d] Y:[%d,%d]\n", half_x_min, half_x_max, half_y_min, half_y_max);
+	}
+	#endif
+    }
+   
+    if (last_solvable_bounding_box_size > 0)
+    {	
+	box_half_x_max = half_x_max;
+	box_half_y_max = half_y_max;
+
+	#ifdef PROFILE
+	{
+	    printf("Init  : %.3f\n", init_cumul);
+	    printf("Refine: %.3f\n", refine_cumul);
+	
+	    printf("Recheck SAT  : %.3f\n", recheck_SAT_cumul);
+	    printf("Recheck UNSAT: %.3f\n", recheck_UNSAT_cumul);
+	    printf("Recheck INDET: %.3f\n", recheck_INDET_cumul);
+	}
+	#endif
+	
+	return true;
+    }    
+    return false;
+}
+
+
+/*----------------------------------------------------------------*/
+
+void augment_TemporalSpread(const SolverConfiguration &solver_configuration,
+			    std::vector<Rational>     &dec_values_T,
+			    const std::vector<int>    &decided_polygons)
+{
+    std::map<double, int, std::less<double>> sorted_polygons;
+
+    #ifdef DEBUG
+    {
+	printf("Origo\n");
+	for (int i = 0; i < dec_values_T.size(); ++i)
+	{
+	    printf("%.3f\n", dec_values_T[i].as_double());
+	}
+    }
+    #endif
+	
+    for (int i = 0; i < decided_polygons.size(); ++i)
+    {
+	sorted_polygons[dec_values_T[decided_polygons[i]].as_double()] = decided_polygons[i];
+    }
+    
+    int time = SEQ_GROUND_PRESENCE_TIME;
+
+    for (const auto& sorted_polygon: sorted_polygons)
+    {
+	dec_values_T[sorted_polygon.second] = Rational(time);
+	time += 2 * solver_configuration.temporal_spread * solver_configuration.object_group_size;
+    }
+
+    #ifdef DEBUG
+    {
+	printf("Augment\n");
+	for (int i = 0; i < dec_values_T.size(); ++i)
+	{
+	    printf("%.3f\n", dec_values_T[i].as_double());
+	}
+    }
+    #endif
+}
+
+
+bool optimize_SubglobalPolygonNonoverlapping(const SolverConfiguration          &solver_configuration,
+					     std::vector<Rational>              &dec_values_X,
+					     std::vector<Rational>              &dec_values_Y,
+					     const std::vector<Slic3r::Polygon> &polygons,
+					     const std::vector<int>             &undecided_polygons,
+					     std::vector<int>                   &decided_polygons,
+					     std::vector<int>                   &remaining_polygons)   
+{
+    vector<int> undecided;
+
+    decided_polygons.clear();
+    remaining_polygons.clear();
+    
+    dec_values_X.resize(polygons.size());
+    dec_values_Y.resize(polygons.size());
+    
+    for (int curr_polygon = 0; curr_polygon < polygons.size(); /* nothing */)
+    {
+	bool optimized = false;
+
+	int remaining_polygon = 0;
+	for(int object_group_size = MIN(solver_configuration.object_group_size, polygons.size() - curr_polygon); object_group_size > 0; --object_group_size)
+	{
+	    z3::context z_context;
+	    z3::solver z_solver(z_context);
+	
+	    z3::expr_vector local_dec_vars_X(z_context);
+	    z3::expr_vector local_dec_vars_Y(z_context);
+	    
+	    vector<Rational> local_values_X;
+	    vector<Rational> local_values_Y;
+
+	    local_values_X.resize(polygons.size());
+	    local_values_Y.resize(polygons.size());
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+                #ifdef DEBUG
+		{
+		    printf("Decided: %d %.3f, %.3f\n", decided_polygons[i], dec_values_X[decided_polygons[i]].as_double(), dec_values_Y[decided_polygons[i]].as_double());
+		}
+		#endif
+		local_values_X[decided_polygons[i]] = dec_values_X[decided_polygons[i]];
+		local_values_Y[decided_polygons[i]] = dec_values_Y[decided_polygons[i]];
+	    }
+	
+	    string_map dec_var_names_map;
+
+	    undecided.clear();
+
+	    /*
+	    for (int i = 0; i < object_group_size; ++i)
+	    {
+		undecided.push_back(curr_polygon + i);		
+	    }
+	    */
+
+	    for (int i = object_group_size - 1; i >= 0; --i)
+	    {
+		undecided.push_back(curr_polygon + i + remaining_polygon);
+	    }
+	    
+	    #ifdef DEBUG
+	    {
+		printf("Undecided\n");
+		for (int j = 0; j < undecided.size(); ++j)
+		{
+		    printf("  %d\n", undecided[j]);
+		}
+		printf("Decided\n");
+		for (int j = 0; j < decided_polygons.size(); ++j)
+		{
+		    printf("  %d\n", decided_polygons[j]);
+		}
+		printf("Locals\n");
+		for (int j = 0; j < polygons.size(); ++j)
+		{
+		    printf("X: %ld,%ld  Y: %ld,%ld  \n",
+			   local_values_X[j].numerator,
+			   local_values_X[j].denominator,
+			   local_values_Y[j].numerator,
+			   local_values_Y[j].denominator);			   
+		}				
+	    }
+	    #endif
+
+	    build_WeakPolygonNonoverlapping(z_solver,
+					    z_context,
+					    polygons,
+					    local_dec_vars_X,
+					    local_dec_vars_Y,
+					    local_values_X,
+					    local_values_Y,
+					    decided_polygons,
+					    undecided,				    
+					    dec_var_names_map);
+
+            #ifdef DEBUG
+	    {
+		printf("%ld,%ld\n", local_values_X.size(), local_values_Y.size());
+
+		for (int i = 0; i < polygons.size(); ++i)
+		{
+		    printf("poly: %ld\n", polygons[i].points.size());
+		    for (int j = 0; j < polygons[i].points.size(); ++j)
+		    {
+			printf("    %d,%d\n", polygons[i].points[j].x(), polygons[i].points[j].y());
+		    }
+		}
+	    }
+	    #endif
+
+	    optimized = optimize_WeakPolygonNonoverlapping(z_solver,
+							   z_context,
+							   solver_configuration,
+							   local_dec_vars_X,
+							   local_dec_vars_Y,
+							   local_values_X,
+							   local_values_Y,
+							   decided_polygons,
+							   undecided,
+							   dec_var_names_map,
+							   polygons);
+
+	    if (optimized)
+	    {
+		for (int i = 0; i < undecided.size(); ++i)
+		{
+		    dec_values_X[undecided[i]] = local_values_X[undecided[i]];
+		    dec_values_Y[undecided[i]] = local_values_Y[undecided[i]];
+		    decided_polygons.push_back(undecided[i]);
+		}
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+		break;
+	    }
+	    else
+	    {
+                #ifdef DEBUG
+		{
+		    printf("Remaining polygon: %d\n", curr_polygon + remaining_polygon);
+		}
+		#endif
+		remaining_polygons.push_back(undecided_polygons[curr_polygon + remaining_polygon++]);
+	    }
+	}
+	if (!optimized)
+	{
+	    if (curr_polygon <= 0)
+	    {		
+		return false;
+	    }
+	    else
+	    {
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+	    }
+	}
+    }
+    return true;
+}
+
+
+bool optimize_SubglobalSequentialPolygonNonoverlapping(const SolverConfiguration          &solver_configuration,
+						       std::vector<Rational>              &dec_values_X,
+						       std::vector<Rational>              &dec_values_Y,
+						       std::vector<Rational>              &dec_values_T,
+						       const std::vector<Slic3r::Polygon> &polygons,
+						       const std::vector<Slic3r::Polygon> &unreachable_polygons,
+						       const std::vector<int>             &undecided_polygons,
+						       std::vector<int>                   &decided_polygons,
+						       std::vector<int>                   &remaining_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }
+
+    return optimize_SubglobalSequentialPolygonNonoverlapping(solver_configuration,
+							     dec_values_X,
+							     dec_values_Y,
+							     dec_values_T,
+							     polygons,
+							     _unreachable_polygons,
+							     undecided_polygons,
+							     decided_polygons,
+							     remaining_polygons);
+}
+
+
+bool optimize_SubglobalSequentialPolygonNonoverlapping(const SolverConfiguration                        &solver_configuration,
+						       std::vector<Rational>                            &dec_values_X,
+						       std::vector<Rational>                            &dec_values_Y,
+						       std::vector<Rational>                            &dec_values_T,
+						       const std::vector<Slic3r::Polygon>               &polygons,
+						       const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+						       const std::vector<int>                           &undecided_polygons,
+						       std::vector<int>                                 &decided_polygons,
+						       std::vector<int>                                 &remaining_polygons)
+{
+    vector<int> undecided;
+
+    decided_polygons.clear();
+    remaining_polygons.clear();
+    
+    dec_values_X.resize(polygons.size());
+    dec_values_Y.resize(polygons.size());
+    dec_values_T.resize(polygons.size());    
+    
+    for (int curr_polygon = 0; curr_polygon < polygons.size(); /* nothing */)
+    {
+	bool optimized = false;
+
+	int remaining_polygon = 0;
+	for(int object_group_size = MIN(solver_configuration.object_group_size, polygons.size() - curr_polygon); object_group_size > 0; --object_group_size)
+	{
+	    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());
+	    //z3::set_param("parallel.enable", "true");
+	    //z3::set_param("smt.threads", "8");
+	    //z3::set_param("parallel.threads.max", "16");
+	    
+	    z3::context z_context;
+	    z3::solver z_solver(z_context);
+	
+	    z3::expr_vector local_dec_vars_X(z_context);
+	    z3::expr_vector local_dec_vars_Y(z_context);
+	    z3::expr_vector local_dec_vars_T(z_context);	    
+	    
+	    vector<Rational> local_values_X;
+	    vector<Rational> local_values_Y;
+	    vector<Rational> local_values_T;	    
+
+	    local_values_X.resize(polygons.size());
+	    local_values_Y.resize(polygons.size());
+	    local_values_T.resize(polygons.size());	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		#ifdef DEBUG
+		{
+		    printf("Decided: %d %.3f, %.3f, %.3f\n",
+			   decided_polygons[i],
+			   dec_values_X[decided_polygons[i]].as_double(),
+			   dec_values_Y[decided_polygons[i]].as_double(),
+			   dec_values_T[decided_polygons[i]].as_double());
+		}
+		#endif
+		
+		local_values_X[decided_polygons[i]] = dec_values_X[decided_polygons[i]];
+		local_values_Y[decided_polygons[i]] = dec_values_Y[decided_polygons[i]];
+		local_values_T[decided_polygons[i]] = dec_values_T[decided_polygons[i]];		
+	    }
+	
+	    string_map dec_var_names_map;
+
+	    undecided.clear();
+
+	    /*
+	    for (int i = 0; i < object_group_size; ++i)
+	    {
+		undecided.push_back(curr_polygon + i);		
+	    }
+	    */
+
+	    for (int i = object_group_size - 1; i >= 0; --i)
+	    {
+		undecided.push_back(curr_polygon + i + remaining_polygon);
+	    }
+	    
+	    #ifdef DEBUG
+	    {
+		printf("Undecided\n");
+		for (int j = 0; j < undecided.size(); ++j)
+		{
+		    printf("  %d\n", undecided[j]);
+		}
+		printf("Decided\n");
+		for (int j = 0; j < decided_polygons.size(); ++j)
+		{
+		    printf("  %d\n", decided_polygons[j]);
+		}
+		printf("Locals\n");
+		for (int j = 0; j < polygons.size(); ++j)
+		{
+		    printf("X: %ld,%ld  Y: %ld,%ld  T: %ld,%ld\n",
+			   local_values_X[j].numerator,
+			   local_values_X[j].denominator,
+			   local_values_Y[j].numerator,
+			   local_values_Y[j].denominator,
+			   local_values_T[j].numerator,
+			   local_values_T[j].denominator);			   
+			   
+		}		
+	    }
+	    #endif
+
+	    build_SequentialWeakPolygonNonoverlapping(z_solver,
+						      z_context,
+						      polygons,
+						      unreachable_polygons,
+						      local_dec_vars_X,
+						      local_dec_vars_Y,
+						      local_dec_vars_T,
+						      local_values_X,
+						      local_values_Y,
+						      local_values_T,
+						      decided_polygons,
+						      undecided,				    
+						      dec_var_names_map);
+
+	    
+	    introduce_SequentialTemporalOrderingAgainstFixed(z_solver,
+							     z_context,
+							     local_dec_vars_T,
+							     local_values_T,
+							     decided_polygons,
+							     undecided,
+							     solver_configuration.temporal_spread,
+							     polygons);
+
+	    #ifdef DEBUG
+	    {
+		printf("%ld,%ld\n", local_values_X.size(), local_values_Y.size());
+		
+		for (int i = 0; i < polygons.size(); ++i)
+		{
+		    printf("poly: %ld\n", polygons[i].points.size());
+		    for (int j = 0; j < polygons[i].points.size(); ++j)
+		    {
+			printf("    %d,%d\n", polygons[i].points[j].x(), polygons[i].points[j].y());
+		    }
+		}
+	    }
+	    #endif
+
+	    optimized = optimize_SequentialWeakPolygonNonoverlapping(z_solver,
+								     z_context,
+								     solver_configuration,
+								     local_dec_vars_X,
+								     local_dec_vars_Y,
+								     local_dec_vars_T,
+								     local_values_X,
+								     local_values_Y,
+								     local_values_T,
+								     decided_polygons,
+								     undecided,
+								     dec_var_names_map,
+								     polygons,
+								     unreachable_polygons);
+
+
+	    if (optimized)
+	    {
+		/*
+		printf("Printing solver status:\n");
+		cout << z_solver << "\n";
+    
+		printf("Printing smt status:\n");
+		cout << z_solver.to_smt2() << "\n";	    
+		*/		
+				
+		for (int i = 0; i < undecided.size(); ++i)
+		{
+		    dec_values_X[undecided[i]] = local_values_X[undecided[i]];
+		    dec_values_Y[undecided[i]] = local_values_Y[undecided[i]];		    
+		    dec_values_T[undecided[i]] = local_values_T[undecided[i]];		    
+		    decided_polygons.push_back(undecided[i]);
+		}
+		augment_TemporalSpread(solver_configuration, dec_values_T, decided_polygons);
+		
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+		break;
+	    }
+	    else
+	    {
+		#ifdef DEBUG
+		{
+		    printf("Remaining polygon: %d\n", curr_polygon + remaining_polygon);
+		}
+		#endif
+		remaining_polygons.push_back(undecided_polygons[curr_polygon + remaining_polygon++]);
+	    }
+	}
+	if (!optimized)
+	{
+	    if (curr_polygon <= 0)
+	    {		
+		return false;
+	    }
+	    else
+	    {
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+	    }
+	}
+    }
+    return true;    
+}
+
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingCentered(const SolverConfiguration          &solver_configuration,
+							       std::vector<Rational>              &dec_values_X,
+							       std::vector<Rational>              &dec_values_Y,
+							       std::vector<Rational>              &dec_values_T,
+							       const std::vector<Slic3r::Polygon> &polygons,
+							       const std::vector<Slic3r::Polygon> &unreachable_polygons,
+							       const std::vector<int>             &undecided_polygons,
+							       std::vector<int>                   &decided_polygons,
+							       std::vector<int>                   &remaining_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }
+
+    return optimize_SubglobalSequentialPolygonNonoverlappingCentered(solver_configuration,
+								     dec_values_X,
+								     dec_values_Y,
+								     dec_values_T,
+								     polygons,
+								     _unreachable_polygons,
+								     undecided_polygons,
+								     decided_polygons,
+								     remaining_polygons);
+}
+
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingCentered(const SolverConfiguration                        &solver_configuration,
+							       std::vector<Rational>                            &dec_values_X,
+							       std::vector<Rational>                            &dec_values_Y,
+							       std::vector<Rational>                            &dec_values_T,
+							       const std::vector<Slic3r::Polygon>               &polygons,
+							       const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+							       const std::vector<int>                           &undecided_polygons,
+							       std::vector<int>                                 &decided_polygons,
+							       std::vector<int>                                 &remaining_polygons)
+{
+    vector<int> undecided;
+
+    decided_polygons.clear();
+    remaining_polygons.clear();
+    
+    dec_values_X.resize(polygons.size());
+    dec_values_Y.resize(polygons.size());
+    dec_values_T.resize(polygons.size());    
+    
+    for (int curr_polygon = 0; curr_polygon < polygons.size(); /* nothing */)
+    {
+	bool optimized = false;
+
+	int remaining_polygon = 0;
+	for(int object_group_size = MIN(solver_configuration.object_group_size, polygons.size() - curr_polygon); object_group_size > 0; --object_group_size)
+	{
+	    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());
+	    //z3::set_param("parallel.enable", "true");
+	    //z3::set_param("smt.threads", "8");
+	    //z3::set_param("parallel.threads.max", "16");
+	    
+	    z3::context z_context;
+	    z3::solver z_solver(z_context);
+	
+	    z3::expr_vector local_dec_vars_X(z_context);
+	    z3::expr_vector local_dec_vars_Y(z_context);
+	    z3::expr_vector local_dec_vars_T(z_context);	    
+	    
+	    vector<Rational> local_values_X;
+	    vector<Rational> local_values_Y;
+	    vector<Rational> local_values_T;	    
+
+	    local_values_X.resize(polygons.size());
+	    local_values_Y.resize(polygons.size());
+	    local_values_T.resize(polygons.size());	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		#ifdef DEBUG
+		{
+		    printf("Decided: %d %.3f, %.3f, %.3f\n",
+			   decided_polygons[i],
+			   dec_values_X[decided_polygons[i]].as_double(),
+			   dec_values_Y[decided_polygons[i]].as_double(),
+			   dec_values_T[decided_polygons[i]].as_double());
+		}
+		#endif
+		
+		local_values_X[decided_polygons[i]] = dec_values_X[decided_polygons[i]];
+		local_values_Y[decided_polygons[i]] = dec_values_Y[decided_polygons[i]];
+		local_values_T[decided_polygons[i]] = dec_values_T[decided_polygons[i]];		
+	    }
+	
+	    string_map dec_var_names_map;
+
+	    undecided.clear();
+
+	    /*
+	    for (int i = 0; i < object_group_size; ++i)
+	    {
+		undecided.push_back(curr_polygon + i);		
+	    }
+	    */
+
+	    for (int i = object_group_size - 1; i >= 0; --i)
+	    {
+		undecided.push_back(curr_polygon + i + remaining_polygon);
+	    }
+	    
+	    #ifdef DEBUG
+	    {
+		printf("Undecided\n");
+		for (int j = 0; j < undecided.size(); ++j)
+		{
+		    printf("  %d\n", undecided[j]);
+		}
+		printf("Decided\n");
+		for (int j = 0; j < decided_polygons.size(); ++j)
+		{
+		    printf("  %d\n", decided_polygons[j]);
+		}
+		printf("Locals\n");
+		for (int j = 0; j < polygons.size(); ++j)
+		{
+		    printf("X: %ld,%ld  Y: %ld,%ld  T: %ld,%ld\n",
+			   local_values_X[j].numerator,
+			   local_values_X[j].denominator,
+			   local_values_Y[j].numerator,
+			   local_values_Y[j].denominator,
+			   local_values_T[j].numerator,
+			   local_values_T[j].denominator);			   
+			   
+		}		
+	    }
+	    #endif
+
+	    build_SequentialWeakPolygonNonoverlapping(z_solver,
+						      z_context,
+						      polygons,
+						      unreachable_polygons,
+						      local_dec_vars_X,
+						      local_dec_vars_Y,
+						      local_dec_vars_T,
+						      local_values_X,
+						      local_values_Y,
+						      local_values_T,
+						      decided_polygons,
+						      undecided,				    
+						      dec_var_names_map);
+
+	    
+	    introduce_SequentialTemporalOrderingAgainstFixed(z_solver,
+							     z_context,
+							     local_dec_vars_T,
+							     local_values_T,
+							     decided_polygons,
+							     undecided,
+							     solver_configuration.temporal_spread,
+							     polygons);
+
+	    #ifdef DEBUG
+	    {
+		printf("%ld,%ld\n", local_values_X.size(), local_values_Y.size());
+
+		for (int i = 0; i < polygons.size(); ++i)
+		{
+		    printf("poly: %ld\n", polygons[i].points.size());
+		    for (int j = 0; j < polygons[i].points.size(); ++j)
+		    {
+			printf("    %d,%d\n", polygons[i].points[j].x(), polygons[i].points[j].y());
+		    }
+		}
+	    }
+	    #endif
+
+	    optimized = optimize_SequentialWeakPolygonNonoverlappingCentered(z_solver,
+									     z_context,
+									     solver_configuration,
+									     local_dec_vars_X,
+									     local_dec_vars_Y,
+									     local_dec_vars_T,
+									     local_values_X,
+									     local_values_Y,
+									     local_values_T,
+									     decided_polygons,
+									     undecided,
+									     dec_var_names_map,
+									     polygons,
+									     unreachable_polygons);
+
+	    
+	    if (optimized)
+	    {
+		/*
+		printf("Printing solver status:\n");
+		cout << z_solver << "\n";
+    
+		printf("Printing smt status:\n");
+		cout << z_solver.to_smt2() << "\n";	    
+		*/		
+				
+		for (int i = 0; i < undecided.size(); ++i)
+		{
+		    dec_values_X[undecided[i]] = local_values_X[undecided[i]];
+		    dec_values_Y[undecided[i]] = local_values_Y[undecided[i]];		    
+		    dec_values_T[undecided[i]] = local_values_T[undecided[i]];		    
+		    decided_polygons.push_back(undecided[i]);
+		}
+		augment_TemporalSpread(solver_configuration, dec_values_T, decided_polygons);
+		
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+		break;
+	    }
+	    else
+	    {
+		#ifdef DEBUG
+		{
+		    printf("Remaining polygon: %d\n", curr_polygon + remaining_polygon);
+		}
+		#endif
+		remaining_polygons.push_back(undecided_polygons[curr_polygon + remaining_polygon++]);
+	    }
+	}
+	if (!optimized)
+	{
+	    if (curr_polygon <= 0)
+	    {		
+		return false;
+	    }
+	    else
+	    {
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+	    }
+	}
+    }
+    return true;    
+}
+
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration          &solver_configuration,
+								     std::vector<Rational>              &dec_values_X,
+								     std::vector<Rational>              &dec_values_Y,
+								     std::vector<Rational>              &dec_values_T,
+								     const std::vector<Slic3r::Polygon> &polygons,
+								     const std::vector<Slic3r::Polygon> &unreachable_polygons,
+								     const std::vector<int>             &undecided_polygons,
+								     std::vector<int>                   &decided_polygons,
+								     std::vector<int>                   &remaining_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }
+
+    return optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+									   dec_values_X,
+									   dec_values_Y,
+									   dec_values_T,
+									   polygons,
+									   _unreachable_polygons,
+									   undecided_polygons,
+									   decided_polygons,
+									   remaining_polygons);
+}
+
+
+bool optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration                        &solver_configuration,
+								     std::vector<Rational>                            &dec_values_X,
+								     std::vector<Rational>                            &dec_values_Y,
+								     std::vector<Rational>                            &dec_values_T,
+								     const std::vector<Slic3r::Polygon>               &polygons,
+								     const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+								     const std::vector<int>                           &undecided_polygons,
+								     std::vector<int>                                 &decided_polygons,
+								     std::vector<int>                                 &remaining_polygons)
+{
+    vector<int> undecided;
+
+    decided_polygons.clear();
+    remaining_polygons.clear();
+    
+    dec_values_X.resize(polygons.size());
+    dec_values_Y.resize(polygons.size());
+    dec_values_T.resize(polygons.size());
+
+    coord_t box_half_x_max = solver_configuration.maximum_X_bounding_box_size / 2;
+    coord_t box_half_y_max = solver_configuration.maximum_Y_bounding_box_size / 2;	    
+    
+    for (int curr_polygon = 0; curr_polygon < polygons.size(); /* nothing */)
+    {
+	bool optimized = false;
+
+	int remaining_polygon = 0;
+	for(int object_group_size = MIN(solver_configuration.object_group_size, polygons.size() - curr_polygon); object_group_size > 0; --object_group_size)
+	{
+	    z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());
+	    //z3::set_param("parallel.enable", "true");
+	    //z3::set_param("smt.threads", "8");
+	    //z3::set_param("parallel.threads.max", "16");
+	    
+	    z3::context z_context;
+	    z3::solver z_solver(z_context);
+	
+	    z3::expr_vector local_dec_vars_X(z_context);
+	    z3::expr_vector local_dec_vars_Y(z_context);
+	    z3::expr_vector local_dec_vars_T(z_context);	    
+	    
+	    vector<Rational> local_values_X;
+	    vector<Rational> local_values_Y;
+	    vector<Rational> local_values_T;	    
+
+	    local_values_X.resize(polygons.size());
+	    local_values_Y.resize(polygons.size());
+	    local_values_T.resize(polygons.size());	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		#ifdef DEBUG
+		{
+		    printf("Decided: %d %.3f, %.3f, %.3f\n",
+			   decided_polygons[i],
+			   dec_values_X[decided_polygons[i]].as_double(),
+			   dec_values_Y[decided_polygons[i]].as_double(),
+			   dec_values_T[decided_polygons[i]].as_double());
+		}
+		#endif
+		
+		local_values_X[decided_polygons[i]] = dec_values_X[decided_polygons[i]];
+		local_values_Y[decided_polygons[i]] = dec_values_Y[decided_polygons[i]];
+		local_values_T[decided_polygons[i]] = dec_values_T[decided_polygons[i]];		
+	    }
+	
+	    string_map dec_var_names_map;
+
+	    undecided.clear();
+
+	    /*
+	    for (int i = 0; i < object_group_size; ++i)
+	    {
+		undecided.push_back(curr_polygon + i);		
+	    }
+	    */
+
+	    for (int i = object_group_size - 1; i >= 0; --i)
+	    {
+		undecided.push_back(curr_polygon + i + remaining_polygon);
+	    }
+	    
+	    #ifdef DEBUG
+	    {
+		printf("Undecided\n");
+		for (int j = 0; j < undecided.size(); ++j)
+		{
+		    printf("  %d\n", undecided[j]);
+		}
+		printf("Decided\n");
+		for (int j = 0; j < decided_polygons.size(); ++j)
+		{
+		    printf("  %d\n", decided_polygons[j]);
+		}
+		printf("Locals\n");
+		for (int j = 0; j < polygons.size(); ++j)
+		{
+		    printf("X: %ld,%ld  Y: %ld,%ld  T: %ld,%ld\n",
+			   local_values_X[j].numerator,
+			   local_values_X[j].denominator,
+			   local_values_Y[j].numerator,
+			   local_values_Y[j].denominator,
+			   local_values_T[j].numerator,
+			   local_values_T[j].denominator);			   
+			   
+		}
+	    }
+	    #endif
+
+	    build_SequentialWeakPolygonNonoverlapping(z_solver,
+						      z_context,
+						      polygons,
+						      unreachable_polygons,
+						      local_dec_vars_X,
+						      local_dec_vars_Y,
+						      local_dec_vars_T,
+						      local_values_X,
+						      local_values_Y,
+						      local_values_T,
+						      decided_polygons,
+						      undecided,				    
+						      dec_var_names_map);
+	    
+	    introduce_SequentialTemporalOrderingAgainstFixed(z_solver,
+							     z_context,
+							     local_dec_vars_T,
+							     local_values_T,
+							     decided_polygons,
+							     undecided,
+							     solver_configuration.temporal_spread,
+							     polygons);
+
+	    #ifdef DEBUG
+	    {
+		printf("%ld,%ld\n", local_values_X.size(), local_values_Y.size());
+
+		for (int i = 0; i < polygons.size(); ++i)
+		{
+		    printf("poly: %ld\n", polygons[i].points.size());
+		    for (int j = 0; j < polygons[i].points.size(); ++j)
+		    {
+			printf("    %d,%d\n", polygons[i].points[j].x(), polygons[i].points[j].y());
+		    }
+		}
+	    }
+	    #endif
+
+	    optimized = optimize_SequentialWeakPolygonNonoverlappingBinaryCentered(z_solver,
+										   z_context,
+										   solver_configuration,
+										   box_half_x_max,
+										   box_half_y_max,
+										   local_dec_vars_X,
+										   local_dec_vars_Y,
+										   local_dec_vars_T,
+										   local_values_X,
+										   local_values_Y,
+										   local_values_T,
+										   decided_polygons,
+										   undecided,
+										   dec_var_names_map,
+										   polygons,
+										   unreachable_polygons);
+
+	    
+	    if (optimized)
+	    {
+		/*
+		printf("Printing solver status:\n");
+		cout << z_solver << "\n";
+    
+		printf("Printing smt status:\n");
+		cout << z_solver.to_smt2() << "\n";	    
+		*/		
+				
+		for (int i = 0; i < undecided.size(); ++i)
+		{
+		    dec_values_X[undecided[i]] = local_values_X[undecided[i]];
+		    dec_values_Y[undecided[i]] = local_values_Y[undecided[i]];		    
+		    dec_values_T[undecided[i]] = local_values_T[undecided[i]];		    
+		    decided_polygons.push_back(undecided[i]);
+		}
+		augment_TemporalSpread(solver_configuration, dec_values_T, decided_polygons);
+		
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+		break;
+	    }
+	    else
+	    {
+		#ifdef DEBUG
+		{
+		    printf("Remaining polygon: %d\n", curr_polygon + remaining_polygon);
+		}
+		#endif
+		remaining_polygons.push_back(undecided_polygons[curr_polygon + remaining_polygon++]);
+	    }
+	}
+	if (!optimized)
+	{
+	    if (curr_polygon <= 0)
+	    {		
+		return false;
+	    }
+	    else
+	    {
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{		    
+		    curr_polygon += solver_configuration.object_group_size;
+
+		    for (; curr_polygon < polygons.size(); ++curr_polygon)
+		    {
+			remaining_polygons.push_back(undecided_polygons[curr_polygon]);
+		    }
+		    return true;		   
+		}
+		else
+		{
+		    return true;
+		}
+	    }
+	}
+    }
+    return true;    
+}
+
+
+bool optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration          &solver_configuration,
+									std::vector<Rational>              &dec_values_X,
+									std::vector<Rational>              &dec_values_Y,
+									std::vector<Rational>              &dec_values_T,
+									const std::vector<Slic3r::Polygon> &polygons,
+									const std::vector<Slic3r::Polygon> &unreachable_polygons,
+									const std::vector<int>             &undecided_polygons,
+									std::vector<int>                   &decided_polygons,
+									std::vector<int>                   &remaining_polygons)
+{
+    std::vector<std::vector<Slic3r::Polygon> > _unreachable_polygons;
+    _unreachable_polygons.resize(unreachable_polygons.size());
+
+    for (int poly = 0; poly < unreachable_polygons.size(); ++poly)
+    {
+	_unreachable_polygons[poly].push_back(unreachable_polygons[poly]);
+    }
+
+    return optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+									      dec_values_X,
+									      dec_values_Y,
+									      dec_values_T,
+									      polygons,
+									      _unreachable_polygons,
+									      undecided_polygons,
+									      decided_polygons,
+									      remaining_polygons);
+}
+
+
+#ifdef PROFILE
+double build_cumul = 0.0;
+clock_t build_start, build_finish;
+#endif
+
+bool optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(const SolverConfiguration                        &solver_configuration,
+									std::vector<Rational>                            &dec_values_X,
+									std::vector<Rational>                            &dec_values_Y,
+									std::vector<Rational>                            &dec_values_T,
+									const std::vector<Slic3r::Polygon>               &polygons,
+									const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons,
+									const std::vector<int>                           &undecided_polygons,
+									std::vector<int>                                 &decided_polygons,
+									std::vector<int>                                 &remaining_polygons)
+{
+    vector<int> undecided;
+
+    decided_polygons.clear();
+    remaining_polygons.clear();
+    
+    dec_values_X.resize(polygons.size());
+    dec_values_Y.resize(polygons.size());
+    dec_values_T.resize(polygons.size());
+
+    int box_half_x_max = solver_configuration.maximum_X_bounding_box_size / 2;
+    int box_half_y_max = solver_configuration.maximum_Y_bounding_box_size / 2;	    
+    
+    for (int curr_polygon = 0; curr_polygon < polygons.size(); /* nothing */)
+    {
+	bool optimized = false;
+
+	z3::set_param("timeout", solver_configuration.optimization_timeout.c_str());
+	    //z3::set_param("parallel.enable", "true");
+	    //z3::set_param("smt.threads", "8");
+	    //z3::set_param("parallel.threads.max", "16");
+	    
+	z3::context z_context;
+	z3::solver z_solver(z_context);
+	
+	z3::expr_vector local_dec_vars_X(z_context);
+	z3::expr_vector local_dec_vars_Y(z_context);
+	z3::expr_vector local_dec_vars_T(z_context);	    
+	
+	vector<Rational> local_values_X;
+	vector<Rational> local_values_Y;
+	vector<Rational> local_values_T;	    
+	
+	local_values_X.resize(polygons.size());
+	local_values_Y.resize(polygons.size());
+	local_values_T.resize(polygons.size());	    
+	
+	for (int i = 0; i < decided_polygons.size(); ++i)
+	{
+            #ifdef DEBUG
+	    {
+		printf("Decided: %d %.3f, %.3f, %.3f\n",
+		       decided_polygons[i],
+		       dec_values_X[decided_polygons[i]].as_double(),
+		       dec_values_Y[decided_polygons[i]].as_double(),
+		       dec_values_T[decided_polygons[i]].as_double());
+	    }
+	    #endif
+	    
+	    local_values_X[decided_polygons[i]] = dec_values_X[decided_polygons[i]];
+	    local_values_Y[decided_polygons[i]] = dec_values_Y[decided_polygons[i]];
+	    local_values_T[decided_polygons[i]] = dec_values_T[decided_polygons[i]];		
+	}
+
+	string_map dec_var_names_map;
+		    
+	int object_group_size = MIN(solver_configuration.object_group_size, polygons.size() - curr_polygon);
+
+	undecided.clear();
+
+	int remaining_polygon = 0;	
+	
+	for (int i = object_group_size - 1; i >= 0; --i)
+	{
+	    undecided.push_back(curr_polygon + i + remaining_polygon);
+	}
+
+	#ifdef PROFILE
+	{
+	    build_start = clock();
+	}
+	#endif
+	build_ConsequentialWeakPolygonNonoverlapping(z_solver,
+						     z_context,
+						     polygons,
+						     unreachable_polygons,
+						     local_dec_vars_X,
+						     local_dec_vars_Y,
+						     local_dec_vars_T,
+						     local_values_X,
+						     local_values_Y,
+						     local_values_T,
+						     decided_polygons,
+						     undecided,				    
+						     dec_var_names_map);
+	#ifdef PROFILE
+	{
+	    build_finish = clock();
+	    build_cumul += (build_finish - build_start) / (double)CLOCKS_PER_SEC;
+	}
+	#endif
+
+	vector<int> missing;
+    
+	while(object_group_size > 0)
+	{
+	    z3::expr_vector presence_assumptions(z_context);
+	    assume_ConsequentialObjectPresence(z_context, local_dec_vars_T, undecided, missing, presence_assumptions);
+	    
+	    #ifdef DEBUG
+	    {
+		printf("Undecided\n");
+		for (int j = 0; j < undecided.size(); ++j)
+		{
+		    printf("  %d\n", undecided[j]);
+		}
+		printf("Decided\n");
+		for (int j = 0; j < decided_polygons.size(); ++j)
+		{
+		    printf("  %d\n", decided_polygons[j]);
+		}
+		printf("Locals\n");
+		for (int j = 0; j < polygons.size(); ++j)
+		{
+		    printf("X: %ld,%ld  Y: %ld,%ld  T: %ld,%ld\n",
+			   local_values_X[j].numerator,
+			   local_values_X[j].denominator,
+			   local_values_Y[j].numerator,
+			   local_values_Y[j].denominator,
+			   local_values_T[j].numerator,
+			   local_values_T[j].denominator);			   
+			   
+		}		
+	    }
+	    #endif
+
+	    introduce_ConsequentialTemporalOrderingAgainstFixed(z_solver,
+								z_context,
+								local_dec_vars_T,
+								local_values_T,
+								decided_polygons,
+								undecided,
+								solver_configuration.temporal_spread,
+								polygons);
+
+	    #ifdef DEBUG
+	    {
+		printf("%ld,%ld\n", local_values_X.size(), local_values_Y.size());
+
+		for (int i = 0; i < polygons.size(); ++i)
+		{
+		    printf("poly: %ld\n", polygons[i].points.size());
+		    for (int j = 0; j < polygons[i].points.size(); ++j)
+		    {
+			printf("    %d,%d\n", polygons[i].points[j].x(), polygons[i].points[j].y());
+		    }
+		}
+	    }
+	    #endif
+
+	    optimized = optimize_ConsequentialWeakPolygonNonoverlappingBinaryCentered(z_solver,
+										      z_context,
+										      solver_configuration,
+										      box_half_x_max,
+										      box_half_y_max,
+										      local_dec_vars_X,
+										      local_dec_vars_Y,
+										      local_dec_vars_T,
+										      local_values_X,
+										      local_values_Y,
+										      local_values_T,
+										      decided_polygons,
+										      undecided,
+										      dec_var_names_map,
+										      polygons,
+										      unreachable_polygons,
+										      presence_assumptions);
+	    
+	    if (optimized)
+	    {
+		/*
+		printf("Printing solver status:\n");
+		cout << z_solver << "\n";
+    
+		printf("Printing smt status:\n");
+		cout << z_solver.to_smt2() << "\n";	    
+		*/		
+				
+		for (int i = 0; i < undecided.size(); ++i)
+		{
+		    dec_values_X[undecided[i]] = local_values_X[undecided[i]];
+		    dec_values_Y[undecided[i]] = local_values_Y[undecided[i]];		    
+		    dec_values_T[undecided[i]] = local_values_T[undecided[i]];		    
+		    decided_polygons.push_back(undecided[i]);
+		}
+		augment_TemporalSpread(solver_configuration, dec_values_T, decided_polygons);
+		
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{
+		    curr_polygon += solver_configuration.object_group_size;
+		}
+		else
+		{
+		    return true;
+		}
+		break;
+	    }
+	    else
+	    {
+		#ifdef DEBUG
+		{
+		    printf("Remaining polygon: %d\n", curr_polygon + remaining_polygon);
+		}
+		#endif
+		remaining_polygons.push_back(undecided_polygons[curr_polygon + remaining_polygon++]);
+	    }	   	    
+	    missing.push_back(undecided.back());
+	    undecided.pop_back();
+
+	    --object_group_size;	    
+	}
+
+	#ifdef PROFILE
+	{
+	    printf("Build: %.3f\n", build_cumul);
+	}
+	#endif
+	
+	if (!optimized)
+	{
+	    if (curr_polygon <= 0)
+	    {		
+		return false;
+	    }
+	    else
+	    {
+		if (polygons.size() - curr_polygon > solver_configuration.object_group_size)
+		{		    
+		    curr_polygon += solver_configuration.object_group_size;
+
+		    for (; curr_polygon < polygons.size(); ++curr_polygon)
+		    {
+			remaining_polygons.push_back(undecided_polygons[curr_polygon]);
+		    }
+		    return true;		   
+		}
+		else
+		{
+		    return true;
+		}
+	    }
+	}
+    }
+    return true;    
+}
+
+
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
diff --git a/src/libseqarrange/src/seq_utilities.cpp b/src/libseqarrange/src/seq_utilities.cpp
new file mode 100644
index 0000000000..08b696edce
--- /dev/null
+++ b/src/libseqarrange/src/seq_utilities.cpp
@@ -0,0 +1,201 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_utilities.cpp
+ *
+ * Various utilities for sequential print.
+ */
+/*================================================================*/
+
+#include <sstream>
+#include <iostream>
+#include <fstream>
+
+#include "seq_defs.hpp"
+
+#include "libslic3r/Geometry.hpp"
+#include "libslic3r/ClipperUtils.hpp"
+
+#include "seq_utilities.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+using namespace std;
+using namespace Slic3r;
+
+
+/*----------------------------------------------------------------*/
+
+namespace Sequential
+{
+     
+
+/*----------------------------------------------------------------*/
+
+
+bool find_and_remove(std::string& src, const std::string& key)
+{
+    size_t pos = src.find(key);
+    if (pos != std::string::npos) {
+        src.erase(pos, key.length());
+        return true;
+    }
+    return false;
+}
+
+
+std::vector<ObjectToPrint> load_exported_data(const std::string& filename)
+{
+    std::vector<ObjectToPrint> objects_to_print;
+
+    std::ifstream in(filename);
+    if (!in)
+        throw std::runtime_error("NO EXPORTED FILE WAS FOUND");
+    std::string line;
+
+    while (in) {        
+        std::getline(in, line);
+        if (find_and_remove(line, "OBJECT_ID")) {
+            objects_to_print.push_back(ObjectToPrint());
+            objects_to_print.back().id = std::stoi(line);
+        }
+        if (find_and_remove(line, "TOTAL_HEIGHT"))
+	{
+            objects_to_print.back().total_height = std::stoi(line);
+	}
+        if (find_and_remove(line, "POLYGON_AT_HEIGHT"))
+	{
+            objects_to_print.back().pgns_at_height.emplace_back(std::make_pair(std::stoi(line), Polygon()));
+	}
+        if (find_and_remove(line, "POINT"))
+	{
+            std::stringstream ss(line);
+            std::string val;
+            ss >> val;
+            Point pt(std::stoi(val), 0);
+            ss >> val;
+            pt.y() = std::stoi(val);
+            objects_to_print.back().pgns_at_height.back().second.append(pt);
+        }
+    }
+    return objects_to_print;
+}
+
+
+int load_printer_geometry(const std::string& filename, PrinterGeometry &printer_geometry)
+{
+    std::ifstream in(filename);
+    if (!in)
+        throw std::runtime_error("NO PRINTER GEOMETRY FILE WAS FOUND");
+    std::string line;
+
+    Polygon *current_polygon = NULL;
+    
+    while (in) {        
+        std::getline(in, line);
+	
+	if (find_and_remove(line, "POLYGON_AT_HEIGHT"))
+	{
+	    coord_t height = std::stoi(line);
+
+	    std::map<coord_t, std::vector<Polygon> >::iterator extruder_slice = printer_geometry.extruder_slices.find(height);
+		
+	    if (extruder_slice != printer_geometry.extruder_slices.end())
+	    {
+		extruder_slice->second.push_back(Polygon());
+		current_polygon = &extruder_slice->second.back();
+	    }
+	    else
+	    {
+		vector<Polygon> polygons;
+		polygons.push_back(Polygon());
+		    
+		current_polygon = &printer_geometry.extruder_slices.insert(std::pair(height, polygons)).first->second.back();
+	    }
+	}
+        else if (find_and_remove(line, "POINT"))
+	{
+            std::stringstream ss(line);
+            std::string val;
+            ss >> val;
+            Point pt(std::stoi(val), 0);
+            ss >> val;
+            pt.y() = std::stoi(val);
+
+	    assert(current_polygon != NULL);
+            current_polygon->append(pt);
+        }
+	else if (find_and_remove(line, "CONVEX_HEIGHT"))
+	{
+            std::stringstream ss(line);
+            std::string val;
+            ss >> val;
+            coord_t height = std::stoi(val);
+
+	    printer_geometry.convex_heights.insert(height);
+	}
+	else if (find_and_remove(line, "BOX_HEIGHT"))
+	{
+            std::stringstream ss(line);
+            std::string val;
+            ss >> val;
+            coord_t height = std::stoi(val);
+	    
+	    printer_geometry.box_heights.insert(height);
+	}
+
+	else if (find_and_remove(line, "X_SIZE"))
+	{
+            std::stringstream ss(line);
+            std::string val;
+            ss >> val;
+            coord_t x_size = std::stoi(val);
+	    
+	    printer_geometry.x_size = x_size;
+	}
+	else if (find_and_remove(line, "Y_SIZE"))
+	{
+            std::stringstream ss(line);
+            std::string val;
+            ss >> val;
+            coord_t y_size = std::stoi(val);
+	    
+	    printer_geometry.y_size = y_size;
+	}			
+    }
+    return 0;    
+}
+
+    
+void save_import_data(const std::string           &filename,
+		      const std::map<double, int> &scheduled_polygons,
+		      const map<int, int>         &original_index_map,
+		      const vector<Rational>      &poly_positions_X,
+		      const vector<Rational>      &poly_positions_Y)
+{
+    std::ofstream out(filename);
+    if (!out)
+        throw std::runtime_error("CANNOT CREATE IMPORT FILE");
+
+    for (const auto& scheduled_polygon: scheduled_polygons)
+    {
+	coord_t X, Y;
+
+	scaleUp_PositionForSlicer(poly_positions_X[scheduled_polygon.second],
+				  poly_positions_Y[scheduled_polygon.second],
+				  X,
+				  Y);
+	const auto& original_index = original_index_map.find(scheduled_polygon.second);
+	    
+//	out << original_index_map[scheduled_polygon.second] << " " << X << " " << Y << endl;
+	out << original_index->second << " " << X << " " << Y << endl;	    
+    }
+}
+
+
+/*----------------------------------------------------------------*/
+
+} // namespace Sequential
diff --git a/src/libseqarrange/src/sequential_decimator.cpp b/src/libseqarrange/src/sequential_decimator.cpp
new file mode 100644
index 0000000000..c184323187
--- /dev/null
+++ b/src/libseqarrange/src/sequential_decimator.cpp
@@ -0,0 +1,411 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    sequential_decimator.cpp
+ *
+ * Polygon decimator utility (especially for extruder models).
+ */
+/*================================================================*/
+
+
+#include <sstream>
+#include <iostream>
+#include <fstream>
+
+#include "libslic3r/Polygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+#include "libslic3r/SVG.hpp"
+
+#include "seq_version.hpp"
+#include "seq_utilities.hpp"
+
+#include "sequential_decimator.hpp"
+
+/*----------------------------------------------------------------*/
+
+using namespace Slic3r;
+using namespace Sequential;
+
+
+/*----------------------------------------------------------------*/
+
+#define SCALE_FACTOR                  50000.0
+
+
+/*----------------------------------------------------------------*/
+
+//const Point polygon_offset_0(28000000, -16000000);  // body
+//const Point polygon_offset_1(-3000000, -60000000);  // hose
+//const Point polygon_offset_2(28000000, -16000000);  // fan
+//const Point polygon_offset_3(0,-24000000);          // gantry
+//const Point polygon_offset_4(0,0);                  // nozzle
+
+
+/*----------------------------------------------------------------*/
+
+
+void print_IntroductoryMessage(void)
+{
+    printf("----------------------------------------------------------------\n");
+    printf("Polygon decimation utility - build %s\n", SEQ_SEQUENTIAL_BUILD);
+    printf("(C) 2024 Prusa Research \n");
+    printf("================================================================\n");	
+}
+
+
+void print_ConcludingMessage(void)
+{
+    printf("----------------------------------------------------------------\n");
+}
+
+
+void print_Help(void)
+{
+    printf("Usage:\n");
+    printf("sequential_prusa [--input-file=<string>]\n");
+    printf("                 [--output-file=<string>]\n");
+    printf("                 [--tolerance=<double>]\n");
+    printf("                 [--x-pos=<double> (in mm)]\n");
+    printf("                 [--y-pos=<double> (in mm)]\n");
+    printf("                 [--x-nozzle=<int> (in coord_t)]\n");
+    printf("                 [--y-nozzle=<int> (in coord_t)]\n");            
+    printf("                 [--help]\n");		
+    printf("\n");
+    printf("\n");
+    printf("Defaults: --input-file=arrange_data_export.txt\n");
+    printf("          --output-file=arrange_data_import.txt\n");
+    printf("          --x-pos='random'\n");
+    printf("          --y-pos='random'\n");
+    printf("          --x-nozzle=0\n");
+    printf("          --y-nozzle=0\n");                
+    printf("          --tolerance=400000 \n");    
+    printf("\n");
+}
+
+
+int parse_CommandLineParameter(const string &parameter, CommandParameters &command_parameters)
+{
+    if (parameter.find("--input-file=") == 0)
+    {
+	command_parameters.input_filename = parameter.substr(13, parameter.size());
+    }
+    else if (parameter.find("--output-file=") == 0)
+    {
+	command_parameters.output_filename = parameter.substr(14, parameter.size());
+    }
+    else if (parameter.find("--tolerance=") == 0)
+    {
+	command_parameters.tolerance = std::atof(parameter.substr(12, parameter.size()).c_str());
+    }
+    else if (parameter.find("--x-pos=") == 0)
+    {
+	command_parameters.x_position = std::atof(parameter.substr(8, parameter.size()).c_str());
+	command_parameters.random_position = false;	
+	
+    }
+    else if (parameter.find("--y-pos=") == 0)
+    {
+	command_parameters.y_position = std::atof(parameter.substr(8, parameter.size()).c_str());
+	command_parameters.random_position = false;
+    }
+    else if (parameter.find("--x-nozzle=") == 0)
+    {
+	command_parameters.x_nozzle = std::atoi(parameter.substr(11, parameter.size()).c_str());
+	
+    }
+    else if (parameter.find("--y-nozzle=") == 0)
+    {
+	command_parameters.y_nozzle = std::atoi(parameter.substr(11, parameter.size()).c_str());
+    }            
+    else if (parameter.find("--help") == 0)
+    {
+	command_parameters.help = true;
+    }    
+    else
+    {
+	return -1;
+    }
+    return 0;
+}
+
+
+void save_DecimatedPolygons(const CommandParameters            &command_parameters,
+			    const std::vector<Slic3r::Polygon> &decimated_polygons)
+{
+    std::ofstream out(command_parameters.output_filename);
+    if (!out)
+        throw std::runtime_error("CANNOT CREATE OUTPUT FILE");
+
+    Point nozzle_offset(-command_parameters.x_nozzle, -command_parameters.y_nozzle);
+	
+    for (int i = 0; i < decimated_polygons.size(); ++i)
+    {
+	out << "[" << i << "]" << endl;
+	out << "{" << endl;
+
+	Slic3r::Polygon shift_polygon = scaleUp_PolygonForSlicer(1,
+								 decimated_polygons[i],
+								 (command_parameters.x_position * SEQ_SLICER_SCALE_FACTOR) * 10,
+								 (command_parameters.y_position * SEQ_SLICER_SCALE_FACTOR) * 10);
+	shift_Polygon(shift_polygon, nozzle_offset);
+    
+	for (const auto& point: shift_polygon.points)
+	{
+	    out << "  { " << point.x() << ",  " << point.y() << "}," << endl;
+	}
+	out << "}" << endl;
+    }
+}
+
+
+int decimate_Polygons(const CommandParameters &command_parameters)
+{
+    clock_t start, finish;
+    
+    printf("Decimation ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+    std::vector<ObjectToPrint> objects_to_print = load_exported_data(command_parameters.input_filename);    
+
+    std::vector<Slic3r::Polygon> decimated_polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+
+    printf("  Decimating objects (polygons) ...\n");
+
+    for (int i = 0; i < objects_to_print.size(); ++i)
+    {
+	for (int j = 0; j < objects_to_print[i].pgns_at_height.size(); ++j)
+	{
+	    coord_t height = objects_to_print[i].pgns_at_height[j].first;
+
+	    if (!objects_to_print[i].pgns_at_height[j].second.points.empty())
+	    {
+		Polygon decimated_polygon;
+		//ground_PolygonByFirstPoint(objects_to_print[i].pgns_at_height[j].second);
+
+		decimate_PolygonForSequentialSolver(command_parameters.tolerance,
+						    objects_to_print[i].pgns_at_height[j].second,
+						    decimated_polygon);
+
+		decimated_polygons.push_back(decimated_polygon);
+	    }	    
+	}
+    }
+    printf("  Decimating objects (polygons) ... finished\n");    
+
+    Point nozzle_offset(-command_parameters.x_nozzle, -command_parameters.y_nozzle);
+	
+    for (int i = 0; i < decimated_polygons.size(); ++i)
+    {
+	printf("  [%d]\n", i);
+	Slic3r::Polygon	shift_polygon = decimated_polygons[i];
+	shift_Polygon(shift_polygon, nozzle_offset);	
+
+	shift_polygon = scaleUp_PolygonForSlicer(1,
+						 shift_polygon,
+						 (command_parameters.x_position * SEQ_SLICER_SCALE_FACTOR) * 10,
+						 (command_parameters.y_position * SEQ_SLICER_SCALE_FACTOR) * 10);
+	
+	for (const auto &point: shift_polygon.points)
+	{	    
+	    cout << "    " << point.x() << "  " << point.y() << endl;
+	}
+    }
+    
+    if (command_parameters.output_filename != "")
+    {
+	save_DecimatedPolygons(command_parameters, decimated_polygons);
+    }
+    
+    string svg_filename = "sequential_decimator.svg";
+    SVG preview_svg(svg_filename);    
+
+    for (int i = 0; i < decimated_polygons.size(); ++i)
+    {
+	Polygon transformed_polygon;
+	Polygon shift_polygon = decimated_polygons[i];
+
+	shift_Polygon(shift_polygon, nozzle_offset);
+	
+	if (command_parameters.random_position)
+	{
+	    transformed_polygon = transform_UpsideDown(solver_configuration,
+						       scaleUp_PolygonForSlicer(1,
+										shift_polygon,
+										rand() % (solver_configuration.maximum_X_bounding_box_size * SEQ_SLICER_SCALE_FACTOR),
+										rand() % (solver_configuration.maximum_Y_bounding_box_size * SEQ_SLICER_SCALE_FACTOR)));
+	}
+	else
+	{
+	    transformed_polygon = transform_UpsideDown(solver_configuration,
+						       scaleUp_PolygonForSlicer(1,
+										shift_polygon,
+										(command_parameters.x_position * SEQ_SLICER_SCALE_FACTOR) * 10,
+										(command_parameters.y_position * SEQ_SLICER_SCALE_FACTOR) * 10));
+	}	
+	Polygon display_polygon = scaleDown_PolygonForSequentialSolver(2, transformed_polygon);
+	
+	string color;
+	
+	switch(i % 16)
+	{
+	case 0:
+	{
+	    color = "green";
+	    break;
+	}
+	case 1:
+	{
+	    color = "blue";
+	    break;
+	}
+	case 2:
+	{
+	    color = "red";	    
+	    break;
+	}
+	case 3:
+	{
+	    color = "grey";	    
+	    break;
+	}
+	case 4:
+	{
+	    color = "cyan";
+	    break;
+	}
+	case 5:
+	{
+	    color = "magenta";
+	    break;
+	}
+	case 6:
+	{
+	    color = "yellow";
+	    break;
+	}
+	case 7:
+	{
+	    color = "black";
+	    break;
+	}
+	case 8:
+	{
+	    color = "indigo";
+	    break;
+	}
+	case 9:
+	{
+	    color = "olive";
+	    break;
+	}
+	case 10:
+	{
+	    color = "firebrick";	    
+	    break;
+	}
+	case 11:
+	{
+	    color = "violet";
+	    break;
+	}	
+	case 12:
+	{
+	    color = "midnightblue";
+	    break;
+	}
+	case 13:
+	{
+	    color = "khaki";
+	    break;
+	}
+	case 14:
+	{
+	    color = "darkslategrey";
+	    break;
+	}
+	case 15:
+	{
+	    color = "hotpink";
+	    break;
+	}			    	    	    
+	
+	default:
+	{
+	    break;
+	}
+	}
+		
+	preview_svg.draw(display_polygon, color);
+    }
+
+    Polygon bed_polygon({ { 0, 0},
+			  { solver_configuration.maximum_X_bounding_box_size, 0 },
+			  { solver_configuration.maximum_X_bounding_box_size, solver_configuration.maximum_Y_bounding_box_size},
+			  { 0, solver_configuration.maximum_Y_bounding_box_size} });		
+    Polygon display_bed_polygon = scaleUp_PolygonForSlicer(SEQ_SVG_SCALE_FACTOR,
+							   bed_polygon,
+							   0,
+							   0);
+    preview_svg.draw_outline(display_bed_polygon, "black");    
+	    
+    preview_svg.Close();
+    printf("  Displaying ... finised\n");
+	
+    finish = clock();
+
+    printf("Decimation ... finished\n");
+    printf("Total CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+
+    return 0;
+}
+
+
+/*----------------------------------------------------------------------------*/
+// main program
+
+int main(int argc, char **argv)
+{
+    int result;
+    CommandParameters command_parameters;
+
+    print_IntroductoryMessage();
+   
+    if (argc >= 1 && argc <= 10)
+    {		
+	for (int i = 1; i < argc; ++i)
+	{
+	    result = parse_CommandLineParameter(argv[i], command_parameters);
+	    if (result < 0)
+	    {
+		printf("Error: Cannot parse command line parameters (code = %d).\n", result);
+		print_Help();
+		
+		return result;
+	    }
+	}
+	if (command_parameters.help)
+	{
+	    print_Help();	    
+	}
+	else
+	{	    
+	    result = decimate_Polygons(command_parameters);
+	    if (result < 0)
+	    {
+		return result;
+	    }
+	}
+    }
+    else
+    {
+	print_Help();
+    }
+    print_ConcludingMessage();
+    
+    return 0;
+}
diff --git a/src/libseqarrange/src/sequential_decimator.hpp b/src/libseqarrange/src/sequential_decimator.hpp
new file mode 100644
index 0000000000..21d2949bf5
--- /dev/null
+++ b/src/libseqarrange/src/sequential_decimator.hpp
@@ -0,0 +1,73 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    sequential_decimator.hpp
+ *
+ * Polygon decimator utility (especially for extruder models).
+ */
+/*================================================================*/
+
+#ifndef __SEQUENTIAL_DECIMATOR_HPP__
+#define __SEQUENTIAL_DECIMATOR_HPP__
+
+/*----------------------------------------------------------------*/
+
+#include "seq_sequential.hpp"
+#include "seq_preprocess.hpp"
+#include "seq_interface.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+const double SEQ_DECIMATION_TOLERANCE = 400000.0;
+
+
+/*----------------------------------------------------------------*/
+
+struct CommandParameters
+{	
+    CommandParameters()
+	: tolerance(SEQ_DECIMATION_TOLERANCE)
+	, input_filename("arrange_data_export.txt")
+	, output_filename("arrange_data_import.txt")
+	, x_position(0)
+	, y_position(0)
+	, random_position(true)
+	, help(false)
+	, x_nozzle(0)
+	, y_nozzle(0)
+    {
+	/* nothing */
+    }
+   
+    double tolerance;    
+    
+    string input_filename;
+    string output_filename;
+
+    double x_position;
+    double y_position;
+    bool random_position;
+
+    coord_t x_nozzle;
+    coord_t y_nozzle;
+
+    bool help;
+};
+
+
+/*----------------------------------------------------------------------------*/
+
+void print_IntroductoryMessage(void);
+void print_ConcludingMessage(void);
+void print_Help(void);
+
+int parse_CommandLineParameter(const string &parameter, CommandParameters &parameters);
+int decimate_Polygons(const CommandParameters &command_parameters);
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQUENTIAL_DECIMATOR_HPP__ */
diff --git a/src/libseqarrange/src/sequential_prusa.cpp b/src/libseqarrange/src/sequential_prusa.cpp
new file mode 100644
index 0000000000..f00bb66b62
--- /dev/null
+++ b/src/libseqarrange/src/sequential_prusa.cpp
@@ -0,0 +1,811 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    sequential_prusa.cpp
+ *
+ * SEQUENTIAL 3D Print Scheduler|Arranger.
+ */
+/*================================================================*/
+
+
+#include "libslic3r/Polygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+#include "libslic3r/SVG.hpp"
+
+#include "seq_version.hpp"
+#include "seq_preprocess.hpp"
+#include "seq_utilities.hpp"
+
+#include "sequential_prusa.hpp"
+
+/*----------------------------------------------------------------*/
+
+using namespace Slic3r;
+using namespace Sequential;
+
+
+/*----------------------------------------------------------------*/
+
+
+void print_IntroductoryMessage(void)
+{
+    printf("----------------------------------------------------------------\n");
+    printf("SEQUENTIAL 3D Print Scheduler|Arranger - build %s\n", SEQ_SEQUENTIAL_BUILD);
+    printf("(C) 2024 Prusa Research \n");
+    printf("================================================================\n");	
+}
+
+
+void print_ConcludingMessage(void)
+{
+    printf("----------------------------------------------------------------\n");
+}
+
+
+void print_Help(void)
+{
+    printf("Usage:\n");
+    printf("sequential_prusa [--input-file=<string>]\n");
+    printf("                 [--output-file=<string>]\n");
+    printf("                 [--printer-file=<string>]\n");    
+    printf("                 [--decimation={yes|no}]\n");
+    printf("                 [--precision={low|high}]\n");    
+    printf("                 [--assumptions={yes|no}]\n");
+    printf("                 [--interactive={yes|no}]\n");        
+    printf("                 [--object-group-size=<int>]\n");
+    printf("                 [--help]\n");		
+    printf("\n");
+    printf("\n");
+    printf("Defaults: --input-file=arrange_data_export.txt\n");
+    printf("          --output-file=arrange_data_import.txt\n");
+    printf("          --printer-file=../printers/printer_geometry.mk4.compatibility.txt\n");
+    printf("          --object-group-size=4 \n");    
+    printf("          --decimation=yes\n");
+    printf("          --precision=high\n");    
+    printf("          --assumptions=yes\n");
+    printf("          --interactive=no\n");    
+    printf("\n");
+}
+
+
+int parse_CommandLineParameter(const string &parameter, CommandParameters &command_parameters)
+{
+    if (parameter.find("--input-file=") == 0)
+    {
+	command_parameters.input_filename = parameter.substr(13, parameter.size());
+    }
+    else if (parameter.find("--output-file=") == 0)
+    {
+	command_parameters.output_filename = parameter.substr(14, parameter.size());
+    }
+    else if (parameter.find("--printer-file=") == 0)
+    {
+	command_parameters.printer_filename = parameter.substr(15, parameter.size());
+    }    
+    else if (parameter.find("--object-group-size=") == 0)
+    {
+	command_parameters.object_group_size = std::atoi(parameter.substr(20, parameter.size()).c_str());
+    }
+    else if (parameter.find("--decimation=") == 0)
+    {
+	string decimation_str = parameter.substr(13, parameter.size());
+	
+	if (decimation_str == "yes")
+	{
+	    command_parameters.decimation = true;
+	}
+	else if (decimation_str == "no")
+	{
+	    command_parameters.decimation = false;
+	}
+	else
+	{
+	    return -2;
+	}
+    }
+    else if (parameter.find("--precision=") == 0)
+    {
+	string decimation_str = parameter.substr(12, parameter.size());
+	
+	if (decimation_str == "high")
+	{
+	    command_parameters.precision = true;
+	}
+	else if (decimation_str == "low")
+	{
+	    command_parameters.precision = false;
+	}
+	else
+	{
+	    return -2;
+	}
+    }    
+    else if (parameter.find("--assumptions=") == 0)
+    {
+	string assumptions_str = parameter.substr(14, parameter.size());
+	
+	if (assumptions_str == "yes")
+	{
+	    command_parameters.assumptions = true;
+	}
+	else if (assumptions_str == "no")
+	{
+	    command_parameters.assumptions = false;
+	}
+	else
+	{
+	    return -2;
+	}
+    }
+    else if (parameter.find("--interactive=") == 0)
+    {
+	string interactive_str = parameter.substr(14, parameter.size());
+	
+	if (interactive_str == "yes")
+	{
+	    command_parameters.interactive = true;
+	}
+	else if (interactive_str == "no")
+	{
+	    command_parameters.interactive = false;
+	}
+	else
+	{
+	    return -2;
+	}
+    }        
+    else if (parameter.find("--help") == 0)
+    {
+	command_parameters.help = true;
+    }    
+    else
+    {
+	return -1;
+    }
+    return 0;
+}
+
+
+string convert_Index2Suffix(int index)
+{
+    string buffer = "000";
+
+    string index_str = std::to_string(index);
+    buffer.replace(buffer.length() - index_str.length(), index_str.length(), index_str);
+    
+    return buffer;
+}
+
+
+int solve_SequentialPrint(const CommandParameters &command_parameters)
+{
+    clock_t start, finish;
+    
+    printf("Sequential scheduling/arranging ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+    solver_configuration.object_group_size = command_parameters.object_group_size;
+
+    PrinterGeometry printer_geometry;
+
+    if (!command_parameters.printer_filename.empty())
+    {
+	printf("  Loading printer geometry ...\n");
+	int result = load_printer_geometry(command_parameters.printer_filename, printer_geometry);
+
+	if (result != 0)
+	{
+	    printf("Cannot load printer geometry (code: %d).\n", result);
+	    return result;
+	}
+	solver_configuration.setup(printer_geometry);
+	printf("  Loading printer geometry ... finished\n");
+    }
+
+    std::vector<ObjectToPrint> objects_to_print = load_exported_data(command_parameters.input_filename);    
+
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+
+    printf("  Preparing objects ...\n");
+
+    map<int, int> original_index_map;    
+
+    for (int i = 0; i < objects_to_print.size(); ++i)
+    {
+	Polygon nozzle_polygon;
+	Polygon extruder_polygon;
+	Polygon hose_polygon;
+	Polygon gantry_polygon;
+
+	std::vector<Slic3r::Polygon> convex_level_polygons;	    
+	std::vector<Slic3r::Polygon> box_level_polygons;
+
+	std::vector<std::vector<Slic3r::Polygon> > extruder_convex_level_polygons;	    
+	std::vector<std::vector<Slic3r::Polygon> > extruder_box_level_polygons;	
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;	
+
+	original_index_map[i] = objects_to_print[i].id;
+
+	if (command_parameters.printer_filename.empty())
+	{	    
+	    for (int j = 0; j < objects_to_print[i].pgns_at_height.size(); ++j)
+	    {
+		coord_t height = objects_to_print[i].pgns_at_height[j].first;
+		
+		if (!objects_to_print[i].pgns_at_height[j].second.points.empty())
+		{
+		    Polygon decimated_polygon;
+		    //ground_PolygonByFirstPoint(objects_to_print[i].pgns_at_height[j].second);
+
+		    if (command_parameters.decimation)
+		    {
+			if (command_parameters.precision)
+			{
+			    solver_configuration.decimation_precision = SEQ_DECIMATION_PRECISION_HIGH;
+			}
+			else
+			{
+			    solver_configuration.decimation_precision = SEQ_DECIMATION_PRECISION_LOW;			
+			}
+			decimate_PolygonForSequentialSolver(solver_configuration,
+							    objects_to_print[i].pgns_at_height[j].second,
+							    decimated_polygon);
+		    }
+		    else
+		    {
+			decimated_polygon = objects_to_print[i].pgns_at_height[j].second;
+			decimated_polygon.make_counter_clockwise();
+		    }
+		    if (!check_PolygonSize(solver_configuration, SEQ_SLICER_SCALE_FACTOR, decimated_polygon))
+		    {
+			printf("Object too large to fit onto plate [ID:%d RID:%d].\n", original_index_map[i], i);
+			return -1;
+		    }
+		    
+		    switch (height)
+		    {
+		    case 0:        // nozzle
+		    {
+			nozzle_polygon = decimated_polygon;		    
+			break;
+		    }
+		    case 2000000:  // extruder
+		    {
+			extruder_polygon = decimated_polygon;		    		    
+			break;
+		    }
+		    case 18000000: // hose
+		    {
+			hose_polygon = decimated_polygon;		    		    		    
+			break;
+		    }
+		    case 26000000: // gantry
+		    {
+			gantry_polygon = decimated_polygon;
+			break;
+		    }
+		    default:
+		    {
+			throw std::runtime_error("UNSUPPORTED POLYGON HEIGHT");		    
+			break;
+		    }
+		    }
+		}
+	    }
+
+	    Polygon scale_down_polygon;
+	    scaleDown_PolygonForSequentialSolver(nozzle_polygon, scale_down_polygon);
+	    polygons.push_back(scale_down_polygon);
+	    
+	    convex_level_polygons.push_back(nozzle_polygon);
+	    convex_level_polygons.push_back(extruder_polygon);
+	    box_level_polygons.push_back(hose_polygon);
+	    box_level_polygons.push_back(gantry_polygon);
+
+	    prepare_UnreachableZonePolygons(solver_configuration,
+					    convex_level_polygons,
+					    box_level_polygons,
+					    SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK4,
+					    SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK4,
+					    scale_down_unreachable_polygons);
+	    
+	    unreachable_polygons.push_back(scale_down_unreachable_polygons);	    
+	}
+	else
+	{
+	    Polygon scale_down_object_polygon;
+	    
+	    prepare_ExtruderPolygons(solver_configuration,
+				     printer_geometry,
+				     objects_to_print[i],
+				     convex_level_polygons,
+				     box_level_polygons,
+				     extruder_convex_level_polygons,
+				     extruder_box_level_polygons);
+
+	    prepare_ObjectPolygons(solver_configuration,
+				   convex_level_polygons,
+				   box_level_polygons,
+				   extruder_convex_level_polygons,
+				   extruder_box_level_polygons,
+				   scale_down_object_polygon,
+				   scale_down_unreachable_polygons);
+	    
+	    unreachable_polygons.push_back(scale_down_unreachable_polygons);
+	    polygons.push_back(scale_down_object_polygon);	    
+	}
+		
+	SVG preview_svg("sequential_prusa.svg");	    	
+	for (int k = 0; k < unreachable_polygons.back().size(); ++k)
+	{
+	    Polygon display_unreachable_polygon = transform_UpsideDown(solver_configuration, SEQ_SVG_SCALE_FACTOR, scaleUp_PolygonForSlicer(SEQ_SVG_SCALE_FACTOR, unreachable_polygons.back()[k], 0, 0));
+	    preview_svg.draw(display_unreachable_polygon, "lightgrey");   
+	}
+	/*
+	Polygon display_unreachable_polygon = scale_UP(polygons.back(), 0, 0);
+	preview_svg.draw(display_unreachable_polygon, "blue");
+	*/
+	preview_svg.Close();
+    }
+
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    //vector<int> original_index_map;
+    vector<int> decided_polygons;
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;
+
+    printf("  Preparing objects ... finished\n");
+
+    int plate_index = 0;
+    
+    do
+    {
+	decided_polygons.clear();
+	remaining_polygons.clear();
+
+	printf("  Object scheduling/arranging ...\n");
+	bool optimized;
+	
+	if (command_parameters.assumptions)
+	{
+	    optimized = optimize_SubglobalConsequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+											   poly_positions_X,
+											   poly_positions_Y,
+											   times_T,
+											   polygons,
+											   unreachable_polygons,
+											   polygon_index_map,
+											   decided_polygons,
+											   remaining_polygons);	    
+	}
+	else
+	{
+	    optimized = optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+											poly_positions_X,
+											poly_positions_Y,
+											times_T,
+											polygons,
+											unreachable_polygons,
+											polygon_index_map,
+											decided_polygons,
+											remaining_polygons);	    	    
+	}
+
+	printf("  Object scheduling/arranging ... finished\n");	
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		printf("  [ID:%d,RID:%d] x:%.3f, y:%.3f (t:%.3f)\n",
+		       original_index_map[decided_polygons[i]],
+		       decided_polygons[i],
+		       poly_positions_X[decided_polygons[i]].as_double(),
+		       poly_positions_Y[decided_polygons[i]].as_double(),
+		       times_T[decided_polygons[i]].as_double());
+	    }
+	    printf("Remaining polygons: %ld\n", remaining_polygons.size());
+	    for (int i = 0; i < remaining_polygons.size(); ++i)
+	    {
+		printf("  ID:%d\n", original_index_map[remaining_polygons[i]]);
+	    }
+
+	    std::map<double, int> scheduled_polygons;
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		scheduled_polygons.insert(std::pair<double, int>(times_T[decided_polygons[i]].as_double(), decided_polygons[i]));
+	    }
+
+	    string output_filename;
+	    
+	    if (command_parameters.interactive)
+	    {
+		output_filename = command_parameters.output_filename;
+	    }
+	    else
+	    {
+		int suffix_position = command_parameters.output_filename.find(".");
+
+		output_filename =   command_parameters.output_filename.substr(0, suffix_position) + "_"
+ 		                  + convert_Index2Suffix(plate_index)		    
+		                  + command_parameters.output_filename.substr(suffix_position, command_parameters.output_filename.length());
+	    }
+
+	    save_import_data(output_filename,
+			     scheduled_polygons,
+			     original_index_map,
+			     poly_positions_X,
+			     poly_positions_Y);
+
+	    string svg_filename;
+	    
+	    if (command_parameters.interactive)
+	    {
+ 		svg_filename = "sequential_prusa.svg";
+	    }
+	    else
+	    {
+ 		svg_filename = "sequential_prusa_" + convert_Index2Suffix(plate_index) +  ".svg";		
+	    }
+	    
+	    SVG preview_svg(svg_filename);
+
+	    if (!unreachable_polygons.empty())
+	    {
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    for (int j = 0; j < unreachable_polygons[decided_polygons[i]].size(); ++j)
+		    {
+			Polygon display_unreachable_polygon = transform_UpsideDown(solver_configuration, SEQ_SVG_SCALE_FACTOR, scaleUp_PolygonForSlicer(SEQ_SVG_SCALE_FACTOR,
+																			unreachable_polygons[decided_polygons[i]][j],
+																			poly_positions_X[decided_polygons[i]].as_double(),
+																			poly_positions_Y[decided_polygons[i]].as_double()));
+			
+			string unreachable_color;
+		
+			switch(j % 8)
+			{
+			case 0:
+			{
+			    unreachable_color = "lightgray";
+			    break;
+			}
+			case 1:
+			{
+			    unreachable_color = "darkgray";
+			    break;
+			}
+			case 2:
+			{
+			    unreachable_color = "dimgrey";
+			    break;
+			}
+			case 3:
+			{
+			    unreachable_color = "silver";
+			    break;			    
+			}
+			case 4:
+			{
+			    unreachable_color = "gainsboro";
+			    break;			    
+			}
+			case 5:
+			{
+			    unreachable_color = "lavender";
+			    break;			    
+			}
+			case 6:
+			{
+			    unreachable_color = "lavenderblush";
+			    break;			    
+			}
+			case 7:
+			{
+			    unreachable_color = "beige";
+			    break;			    
+			}			
+			default:
+			{
+			    break;
+			}
+			}			
+			preview_svg.draw(display_unreachable_polygon, unreachable_color);   
+		    }
+		}
+	    }
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		Polygon display_polygon = transform_UpsideDown(solver_configuration, SEQ_SVG_SCALE_FACTOR, scaleUp_PolygonForSlicer(SEQ_SVG_SCALE_FACTOR,
+																    polygons[decided_polygons[i]],
+																    poly_positions_X[decided_polygons[i]].as_double(),
+																    poly_positions_Y[decided_polygons[i]].as_double()));
+		
+		string color;
+		
+		switch(i % 12)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+
+		case 7:
+		{
+		    color = "rosybrown";
+		    break;
+		}		
+		
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "firebrick";	    
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}	
+		case 12:
+		{
+		    color = "midnightblue";
+		    break;
+		}
+		case 13:
+		{
+		    color = "khaki";
+		    break;
+		}
+		case 14:
+		{
+		    color = "darkslategrey";
+		    break;
+		}
+		case 15:
+		{
+		    color = "hotpink";
+		    break;
+		}			    	    	    
+				
+		default:
+		{
+		    break;
+		}
+		}
+		
+		preview_svg.draw(display_polygon, color);
+	    }
+	    std::map<double, int>::const_iterator scheduled_polygon = scheduled_polygons.begin();
+	    for (int i = 0; i < decided_polygons.size(); ++i, ++scheduled_polygon)
+	    {
+		coord_t sx, sy, x, y;
+		
+		scaleUp_PositionForSlicer(SEQ_SVG_SCALE_FACTOR,
+					  poly_positions_X[decided_polygons[i]].as_double(),
+					  poly_positions_Y[decided_polygons[i]].as_double(),
+					  sx, sy);
+		transform_UpsideDown(solver_configuration, SEQ_SVG_SCALE_FACTOR, sx, sy, x, y);
+
+		string text_color;		
+
+		switch(i % 12)
+		{
+		case 0:
+		case 1:
+		case 2:
+		case 3:
+		case 4:
+		case 5:
+		case 6:
+		{
+		    text_color = "black";
+		    break;
+		}
+		case 7:
+		{
+		    text_color = "grey";
+		    break;
+		}
+		case 8:
+		case 9:
+		case 10:
+		case 11:
+		{
+		    text_color = "black";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}		
+		
+		preview_svg.draw_text(Point(x, y), ("ID:" + std::to_string(original_index_map[decided_polygons[i]]) + " T:" + std::to_string(times_T[decided_polygons[i]].as_int64())).c_str(), text_color.c_str());
+	    }
+	    Polygon plate_polygon({ { 0, 0},
+				  { solver_configuration.maximum_X_bounding_box_size, 0 },
+				  { solver_configuration.maximum_X_bounding_box_size, solver_configuration.maximum_Y_bounding_box_size},
+				  { 0, solver_configuration.maximum_Y_bounding_box_size} });		
+	    Polygon display_plate_polygon = scaleUp_PolygonForSlicer(SEQ_SVG_SCALE_FACTOR,
+								     plate_polygon,
+								     0,
+								     0);
+	    preview_svg.draw_outline(display_plate_polygon, "black");
+	    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}	
+	finish = clock();	
+	printf("Intermediate CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+
+	if (!remaining_polygons.empty())
+	{
+	    printf("Some object did not fit into plate.\n");
+
+	    if (command_parameters.interactive)
+	    {
+		printf("Press ENTER to continue to the next plate ...\n");
+		getchar();
+	    }
+	    else
+	    {
+		++plate_index;
+		printf("Continuing to the next plate number %d ...\n", plate_index);
+	    }
+	}
+	else
+	{
+	    printf("All objects fit onto plate.\n");
+	}
+	
+	vector<Polygon> next_polygons;
+	vector<vector<Polygon> > next_unreachable_polygons;
+
+	#ifdef DEBUG
+	{
+	    for (int i = 0; i < polygon_index_map.size(); ++i)
+	    {
+		printf("  %d\n", polygon_index_map[i]);
+	    }
+	}
+	#endif
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	vector<int> next_polygon_index_map;
+	//vector<int> next_original_index_map;
+	map<int, int> next_original_index_map;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    next_polygon_index_map.push_back(index);
+	    next_original_index_map[index] = original_index_map[remaining_polygons[index]];
+	}
+	polygon_index_map = next_polygon_index_map;
+	original_index_map = next_original_index_map;
+    }
+    while (!remaining_polygons.empty());    
+
+    finish = clock();
+
+    printf("Sequential scheduling/arranging ... finished\n");
+    printf("Total CPU time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+
+    return 0;
+}
+
+
+/*----------------------------------------------------------------------------*/
+// main program
+
+int main(int argc, char **argv)
+{
+    int result;
+    CommandParameters command_parameters;
+
+    print_IntroductoryMessage();
+   
+    if (argc >= 1 && argc <= 10)
+    {		
+	for (int i = 1; i < argc; ++i)
+	{
+	    result = parse_CommandLineParameter(argv[i], command_parameters);
+	    if (result < 0)
+	    {
+		printf("Error: Cannot parse command line parameters (code = %d).\n", result);
+		print_Help();
+		
+		return result;
+	    }
+	}
+	if (command_parameters.help)
+	{
+	    print_Help();	    
+	}
+	else
+	{	    
+	    result = solve_SequentialPrint(command_parameters);
+	    if (result < 0)
+	    {
+		return result;
+	    }
+	}
+    }
+    else
+    {
+	print_Help();
+    }
+    print_ConcludingMessage();
+    
+    return 0;
+}
diff --git a/src/libseqarrange/src/sequential_prusa.hpp b/src/libseqarrange/src/sequential_prusa.hpp
new file mode 100644
index 0000000000..0543a98c7d
--- /dev/null
+++ b/src/libseqarrange/src/sequential_prusa.hpp
@@ -0,0 +1,65 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    sequential_prusa.hpp
+ *
+ * SEQUENTIAL 3D Print Scheduler|Arranger.
+ */
+/*================================================================*/
+
+#ifndef __SEQUENTIAL_PRUSA_HPP__
+#define __SEQUENTIAL_PRUSA_HPP__
+
+/*----------------------------------------------------------------*/
+
+#include "seq_sequential.hpp"
+#include "seq_preprocess.hpp"
+#include "seq_interface.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+struct CommandParameters
+{	
+    CommandParameters()
+	: decimation(true)
+	, precision(true)
+	, assumptions(true)
+	, interactive(false)	  
+	, object_group_size(4)
+	, input_filename("arrange_data_export.txt")
+	, output_filename("arrange_data_import.txt")
+	, printer_filename("../printers/printer_geometry.mk4.compatibility.txt")
+	, help(false)
+    {
+	/* nothing */
+    }
+   
+    bool decimation;
+    bool precision;
+    bool assumptions;
+    bool interactive;    
+    int object_group_size;
+
+    string input_filename;
+    string output_filename;
+    string printer_filename;    
+
+    bool help;
+};
+
+
+/*----------------------------------------------------------------------------*/
+
+    void print_IntroductoryMessage(void);
+    void print_ConcludingMessage(void);
+    void print_Help(void);
+    
+    int parse_CommandLineParameter(const string &parameter, CommandParameters &parameters);
+    int solve_SequentialPrint(const CommandParameters &command_parameters);
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQUENTIAL_PRUSA_HPP__ */
diff --git a/src/libseqarrange/test/CMakeLists.txt b/src/libseqarrange/test/CMakeLists.txt
new file mode 100644
index 0000000000..32c0d6964b
--- /dev/null
+++ b/src/libseqarrange/test/CMakeLists.txt
@@ -0,0 +1,22 @@
+# Minimum required version of CMake
+cmake_minimum_required(VERSION 3.10)
+
+# Set C++ standard and flags
+set(CMAKE_CXX_STANDARD 17)
+
+
+# add_executable(seq_test_arrangement seq_test_arrangement.cpp)
+# target_link_libraries(seq_test_arrangement libseqarrange)
+
+add_executable(seq_test_polygon seq_test_polygon.cpp prusaparts.cpp)
+target_link_libraries(seq_test_polygon libseqarrange)
+
+add_executable(seq_test_sequential seq_test_sequential.cpp)
+target_link_libraries(seq_test_sequential libseqarrange)
+
+add_executable(seq_test_preprocess seq_test_preprocess.cpp prusaparts.cpp)
+target_link_libraries(seq_test_preprocess libseqarrange)
+
+add_executable(seq_test_interface seq_test_interface.cpp)
+target_link_libraries(seq_test_interface libseqarrange)
+
diff --git a/src/libseqarrange/test/prusaparts.cpp b/src/libseqarrange/test/prusaparts.cpp
new file mode 100644
index 0000000000..72d5c7d9bc
--- /dev/null
+++ b/src/libseqarrange/test/prusaparts.cpp
@@ -0,0 +1,5981 @@
+#include "prusaparts.hpp"
+
+const TestData PRUSA_PART_POLYGONS =
+{
+    {
+        {-5000000, 8954050},
+        {5000000, 8954050},
+        {5000000, -45949},
+        {4972609, -568550},
+        {3500000, -8954050},
+        {-3500000, -8954050},
+        {-4972609, -568550},
+        {-5000000, -45949},
+        {-5000000, 8954050},
+    },
+    {
+        {-63750000, -8000000},
+        {-54750000, 46000000},
+        {50750000, 46000000},
+        {63750000, 33000000},
+        {63750000, -46000000},
+        {-54750000, -46000000},
+        {-63750000, -28000000},
+        {-63750000, -8000000},
+    },
+    {
+        {-52750000, 41512348},
+        {-31250000, 45987651},
+        {52750000, 45987651},
+        {52750000, -45987651},
+        {-52750000, -45987651},
+        {-52750000, 41512348},
+    },
+    {
+        {-3900000, 14000000},
+        {-2167950, 14000000},
+        {1721454, 7263400},
+        {3828529, 3613790},
+        {3838809, 3582149},
+        {3871560, 3270569},
+        {3900000, 3000000},
+        {3500000, -3000000},
+        {3471560, -3270565},
+        {3447549, -3498986},
+        {3292510, -3976167},
+        {3099999, -4512949},
+        {2530129, -5500000},
+        {807565, -8483570},
+        {-2377349, -14000000},
+        {-3900000, -14000000},
+        {-3900000, 14000000},
+    },
+    {
+        {-31750000, -1000000},
+        {-25250000, 40500000},
+        {-18250000, 47500000},
+        {10750000, 47500000},
+        {16750000, 41500000},
+        {31750000, -37000000},
+        {31750000, -43857898},
+        {28107900, -47500000},
+        {18392099, -47500000},
+        {-20750000, -46500000},
+        {-31750000, -4000000},
+        {-31750000, -1000000},
+    },
+    {
+        {-34625000, -14265399},
+        {-10924999, 24875000},
+        {33325000, 24875000},
+        {37575000, 20625000},
+        {37575000, 17625000},
+        {26575000, -24875000},
+        {-8924999, -24875000},
+        {-34625000, -24484600},
+        {-37575000, -19375000},
+        {-34625000, -14265399},
+    },
+    {
+        {-14000000, 9000000},
+        {-11000000, 17000000},
+        {14000000, 17000000},
+        {14000000, -17000000},
+        {-11000000, -17000000},
+        {-14000000, -8000000},
+        {-14000000, 9000000},
+    },
+    {
+        {-5300000, 2227401},
+        {-237800, 5150001},
+        {5299999, 5150001},
+        {5299999, 650001},
+        {4699999, -5149997},
+        {-5300000, -5149997},
+        {-5300000, 2227401},
+    },
+    {
+        {-12000000, 18000000},
+        {12000000, 18000000},
+        {12000000, -18000000},
+        {-12000000, -18000000},
+        {-12000000, 18000000},
+    },
+    {
+        {-18000000, -1000000},
+        {-15000000, 22000000},
+        {-11000000, 26000000},
+        {11000000, 26000000},
+        {15000000, 22000000},
+        {18000000, -1000000},
+        {18000000, -26000000},
+        {-18000000, -26000000},
+        {-18000000, -1000000},
+    },
+    {
+        {-77500000, 30000000},
+        {-72500000, 35000000},
+        {72500000, 35000000},
+        {77500000, 30000000},
+        {77500000, -32928901},
+        {75428901, -35000000},
+        {-75428901, -35000000},
+        {-77500000, -32928901},
+        {-77500000, 30000000},
+    },
+    {
+        {-9945219, -3065619},
+        {-9781479, -2031780},
+        {-9510560, -1020730},
+        {-9135450, -43529},
+        {-2099999, 14110899},
+        {2099999, 14110899},
+        {9135450, -43529},
+        {9510560, -1020730},
+        {9781479, -2031780},
+        {9945219, -3065619},
+        {10000000, -4110899},
+        {9945219, -5156179},
+        {9781479, -6190019},
+        {9510560, -7201069},
+        {9135450, -8178270},
+        {8660249, -9110899},
+        {8090169, -9988750},
+        {7431449, -10802209},
+        {6691309, -11542349},
+        {5877850, -12201069},
+        {5000000, -12771149},
+        {4067369, -13246350},
+        {3090169, -13621459},
+        {2079119, -13892379},
+        {1045279, -14056119},
+        {0, -14110899},
+        {-1045279, -14056119},
+        {-2079119, -13892379},
+        {-3090169, -13621459},
+        {-4067369, -13246350},
+        {-5000000, -12771149},
+        {-5877850, -12201069},
+        {-6691309, -11542349},
+        {-7431449, -10802209},
+        {-8090169, -9988750},
+        {-8660249, -9110899},
+        {-9135450, -8178270},
+        {-9510560, -7201069},
+        {-9781479, -6190019},
+        {-9945219, -5156179},
+        {-10000000, -4110899},
+        {-9945219, -3065619},
+    },
+    {
+        {-34192394, -5192389},
+        {-31499996, 39000000},
+        {-8183795, 47668998},
+        {-6769596, 47668998},
+        {-4648197, 45547698},
+        {34192394, 6707109},
+        {34192394, 5192389},
+        {31500003, -39000000},
+        {8183803, -47668998},
+        {6769603, -47668998},
+        {4648202, -45547698},
+        {-32474895, -8424619},
+        {-34192394, -6707109},
+        {-34192394, -5192389},
+    },
+    {
+        {-23475500, -11910099},
+        {-18000000, 8217699},
+        {-11139699, 20100000},
+        {-10271400, 20899999},
+        {9532010, 20899999},
+        {11199999, 20100000},
+        {18500000, 8600000},
+        {23475500, -11910099},
+        {23799999, -14899999},
+        {23706600, -15788900},
+        {23668899, -16147499},
+        {23281299, -17340400},
+        {22654100, -18426700},
+        {21814800, -19358900},
+        {20799999, -20096199},
+        {19654100, -20606300},
+        {18427200, -20867099},
+        {17799999, -20899999},
+        {-17799999, -20899999},
+        {-18427200, -20867099},
+        {-19654100, -20606300},
+        {-20799999, -20096199},
+        {-21814800, -19358900},
+        {-22654100, -18426700},
+        {-23281299, -17340400},
+        {-23668899, -16147499},
+        {-23799999, -14899999},
+        {-23475500, -11910099},
+    },
+    {
+        {-32000000, 10000000},
+        {-31934440, 10623733},
+        {-31740640, 11220210},
+        {-31427049, 11763360},
+        {-31007389, 12229430},
+        {-30500000, 12598079},
+        {-29927051, 12853170},
+        {-29313585, 12983570},
+        {16000000, 16000000},
+        {26000000, 16000000},
+        {31007400, 12229430},
+        {31427101, 11763360},
+        {31740600, 11220210},
+        {31934398, 10623733},
+        {32000000, 10000000},
+        {32000000, -13000000},
+        {31934398, -13623699},
+        {31740600, -14220199},
+        {31427101, -14763399},
+        {31007400, -15229400},
+        {30500000, -15598100},
+        {29927101, -15853200},
+        {29313598, -15983600},
+        {29000000, -16000000},
+        {-28000000, -16000000},
+        {-29313585, -15983600},
+        {-29927051, -15853200},
+        {-30500000, -15598100},
+        {-31007389, -15229400},
+        {-31427049, -14763399},
+        {-31740640, -14220199},
+        {-31934440, -13623699},
+        {-32000000, -13000000},
+        {-32000000, 10000000},
+    },
+    {
+        {-36133789, -46431022},
+        {-36040100, -46171817},
+        {-35852722, -45653411},
+        {2200073, 59616485},
+        {12112792, 87039184},
+        {14274505, 93019332},
+        {14382049, 93291641},
+        {14508483, 93563430},
+        {14573425, 93688369},
+        {14654052, 93832443},
+        {14818634, 94096328},
+        {14982757, 94327621},
+        {15001708, 94352630},
+        {15202392, 94598999},
+        {15419342, 94833160},
+        {15497497, 94910552},
+        {15650848, 95053039},
+        {15894866, 95256866},
+        {16104309, 95412185},
+        {16149047, 95443206},
+        {16410888, 95611038},
+        {16677795, 95759750},
+        {16782348, 95812332},
+        {16947143, 95889144},
+        {17216400, 95999465},
+        {17483123, 96091293},
+        {17505554, 96098251},
+        {17745178, 96165542},
+        {18000671, 96223373},
+        {18245880, 96265884},
+        {18484039, 96295257},
+        {18976715, 96319580},
+        {31135131, 96319580},
+        {31697082, 96287902},
+        {31746368, 96282104},
+        {32263000, 96190719},
+        {32338623, 96172576},
+        {32821411, 96026641},
+        {32906188, 95995391},
+        {33360565, 95797012},
+        {33443420, 95754882},
+        {33869171, 95505874},
+        {33900756, 95485122},
+        {34136413, 95318618},
+        {34337127, 95159790},
+        {34377288, 95125930},
+        {34619628, 94905410},
+        {34756286, 94767364},
+        {34859008, 94656143},
+        {35090606, 94378067},
+        {35120849, 94338546},
+        {35309295, 94072113},
+        {35434875, 93871475},
+        {35510070, 93740310},
+        {35688232, 93385772},
+        {35699096, 93361679},
+        {35839782, 93012557},
+        {35905487, 92817459},
+        {35961578, 92625488},
+        {36048004, 92249023},
+        {36051574, 92229934},
+        {36108856, 91831405},
+        {36122985, 91667816},
+        {36133789, 91435317},
+        {36129669, 91085830},
+        {36127685, 91046661},
+        {36092742, 90669830},
+        {36069946, 90514739},
+        {36031829, 90308425},
+        {35948211, 89965225},
+        {34482635, 84756820},
+        {27911407, 61403976},
+        {-5872558, -58657440},
+        {-14243621, -88406509},
+        {-14576812, -89590599},
+        {-15421997, -92594200},
+        {-15657684, -93431732},
+        {-16038940, -93720520},
+        {-16420196, -94009307},
+        {-17182708, -94586875},
+        {-18834838, -95838272},
+        {-19470275, -96319580},
+        {-21368133, -96319580},
+        {-22763854, -96319534},
+        {-29742462, -96319274},
+        {-32533935, -96319168},
+        {-36133789, -54619018},
+        {-36133789, -46431022},
+    },
+    {
+        {-26000000, 25500000},
+        {-6500000, 45000000},
+        {17499998, 45000000},
+        {23966310, 38533699},
+        {26000000, 36500000},
+        {26000000, -19000000},
+        {25950000, -24500000},
+        {17000000, -42214698},
+        {14300000, -45000000},
+        {-14299999, -45000000},
+        {-17500000, -41714698},
+        {-23400001, -24500000},
+        {-26000000, -10464000},
+        {-26000000, 25500000},
+    },
+    {
+        {-26000000, 16636100},
+        {-25072200, 18777799},
+        {-16500000, 35299999},
+        {-15050000, 36750000},
+        {13550000, 36750000},
+        {15000000, 35299999},
+        {26000000, 16045200},
+        {26000000, -2750000},
+        {16500000, -34507900},
+        {14840600, -36167301},
+        {14257900, -36750000},
+        {-14257900, -36750000},
+        {-16500000, -34507900},
+        {-26000000, -2750000},
+        {-26000000, 16636100},
+    },
+    {
+        {-18062349, 18950099},
+        {4644938, 20049900},
+        {6230361, 20049900},
+        {7803279, 19851200},
+        {9338899, 19456899},
+        {10812990, 18873300},
+        {12202310, 18109500},
+        {13484951, 17177600},
+        {14640670, 16092300},
+        {15651250, 14870700},
+        {16500749, 13532100},
+        {17175849, 12097599},
+        {17665750, 10589700},
+        {17962850, 9032400},
+        {18062349, 7450099},
+        {17962850, 5867799},
+        {15810750, -11007740},
+        {15683750, -11727769},
+        {15506849, -12437200},
+        {15280929, -13132559},
+        {15007040, -13810470},
+        {14686531, -14467609},
+        {14320949, -15100799},
+        {13912099, -15706950},
+        {13461959, -16283100},
+        {12972730, -16826450},
+        {12446790, -17334339},
+        {11886699, -17804309},
+        {11295190, -18234069},
+        {10675149, -18621520},
+        {10029590, -18964771},
+        {9361650, -19262149},
+        {8674600, -19512220},
+        {7971780, -19713699},
+        {7256609, -19865798},
+        {6532589, -19967498},
+        {5803222, -20018501},
+        {5437650, -20024900},
+        {-1062349, -20049900},
+        {-16562349, -20049900},
+        {-18062349, -18549900},
+        {-18062349, 18950099},
+    },
+    {
+        {-18062349, 41299900},
+        {-1062349, 41299900},
+        {15280929, -8117440},
+        {15506849, -8812799},
+        {15683750, -9522230},
+        {15810750, -10242259},
+        {17962850, -27117799},
+        {18062349, -28700099},
+        {17962850, -30282400},
+        {17665750, -31839700},
+        {17175849, -33347599},
+        {16500749, -34782100},
+        {15651250, -36120700},
+        {14640670, -37342300},
+        {13484951, -38427600},
+        {12202310, -39359500},
+        {10812990, -40123298},
+        {9338899, -40706901},
+        {7803279, -41101200},
+        {6230361, -41299900},
+        {4644938, -41299900},
+        {-18062349, -40200099},
+        {-18062349, 41299900},
+    },
+    {
+        {-11750000, 13057900},
+        {-9807860, 15000000},
+        {4392139, 24000000},
+        {11750000, 24000000},
+        {11750000, -24000000},
+        {4392139, -24000000},
+        {-9807860, -15000000},
+        {-11750000, -13057900},
+        {-11750000, 13057900},
+    },
+    {
+        {-12500000, 17500000},
+        {12500000, 17500000},
+        {12500000, -17500000},
+        {-12500000, -17500000},
+        {-12500000, 17500000},
+    },
+    {
+        {-23500000, 11500000},
+        {-13857859, 21000000},
+        {-11000000, 21000000},
+        {18500000, 500000},
+        {23500000, -4500000},
+        {23500000, -19500000},
+        {22000000, -21000000},
+        {-23500000, -21000000},
+        {-23500000, 11500000},
+    },
+    {
+        {-13000000, 5250000},
+        {-4000000, 6750000},
+        {4000000, 6750000},
+        {13000000, 5250000},
+        {13000000, 838459},
+        {11376299, -1973939},
+        {10350899, -3750000},
+        {8618800, -6750000},
+        {-8498290, -6750000},
+        {-13000000, 1047180},
+        {-13000000, 5250000},
+    },
+    {
+        {-25000000, 50500000},
+        {-21500000, 54000000},
+        {18286800, 54000000},
+        {25000000, 47286800},
+        {25000000, -47286800},
+        {18286800, -54000000},
+        {-21500000, -54000000},
+        {-25000000, -50500000},
+        {-25000000, 50500000},
+    },
+    {
+        {-19000000, 46000000},
+        {-16799999, 46000000},
+        {14000000, 34000000},
+        {19000000, 29000000},
+        {19000000, -29000000},
+        {14000000, -34000000},
+        {-16799999, -46000000},
+        {-19000000, -46000000},
+        {-19000000, 46000000},
+    },
+    {
+        {-7956170, 836226},
+        {-7825180, 1663290},
+        {-7767529, 1914530},
+        {-7608449, 2472140},
+        {-7308360, 3253890},
+        {-7083650, 3717780},
+        {-6928199, 4000000},
+        {-6472139, 4702280},
+        {-5988090, 5304979},
+        {-5945159, 5353040},
+        {-5353040, 5945159},
+        {-4702280, 6472139},
+        {-4544519, 6583869},
+        {-4000000, 6928199},
+        {-3253890, 7308360},
+        {-2836839, 7480130},
+        {-2472140, 7608449},
+        {-1663290, 7825180},
+        {-964293, 7941669},
+        {-836226, 7956170},
+        {0, 8000000},
+        {836226, 7956170},
+        {964293, 7941669},
+        {1663290, 7825180},
+        {2472140, 7608449},
+        {2836839, 7480130},
+        {3253890, 7308360},
+        {4000000, 6928199},
+        {4544519, 6583869},
+        {4702280, 6472139},
+        {5353040, 5945159},
+        {5945159, 5353040},
+        {5988090, 5304979},
+        {6472139, 4702280},
+        {6928199, 4000000},
+        {7083650, 3717780},
+        {7308360, 3253890},
+        {7608449, 2472140},
+        {7767529, 1914530},
+        {7825180, 1663290},
+        {7956170, 836226},
+        {8000000, 0},
+        {7956170, -836226},
+        {7825180, -1663290},
+        {7767529, -1914530},
+        {7608449, -2472140},
+        {7308360, -3253890},
+        {7083650, -3717780},
+        {6928199, -4000000},
+        {6472139, -4702280},
+        {5988090, -5304979},
+        {5945159, -5353040},
+        {5353040, -5945159},
+        {4702280, -6472139},
+        {4544519, -6583869},
+        {4000000, -6928199},
+        {3253890, -7308360},
+        {2836839, -7480130},
+        {2472140, -7608449},
+        {1663290, -7825180},
+        {964293, -7941669},
+        {836226, -7956170},
+        {0, -8000000},
+        {-836226, -7956170},
+        {-964293, -7941669},
+        {-1663290, -7825180},
+        {-2472140, -7608449},
+        {-2836839, -7480130},
+        {-3253890, -7308360},
+        {-4000000, -6928199},
+        {-4544519, -6583869},
+        {-4702280, -6472139},
+        {-5353040, -5945159},
+        {-5945159, -5353040},
+        {-5988090, -5304979},
+        {-6472139, -4702280},
+        {-6928199, -4000000},
+        {-7083650, -3717780},
+        {-7308360, -3253890},
+        {-7608449, -2472140},
+        {-7767529, -1914530},
+        {-7825180, -1663290},
+        {-7956170, -836226},
+        {-8000000, 0},
+        {-7956170, 836226},
+    },
+};
+
+const TestData PRUSA_STEGOSAUR_POLYGONS =
+{
+    {
+        {113210205, 107034095},
+        {113561798, 109153793},
+        {113750099, 109914001},
+        {114396499, 111040199},
+        {114599197, 111321998},
+        {115570404, 112657096},
+        {116920097, 114166595},
+        {117630599, 114609390},
+        {119703704, 115583900},
+        {120559494, 115811996},
+        {121045410, 115754493},
+        {122698097, 115526496},
+        {123373001, 115370193},
+        {123482406, 115315689},
+        {125664199, 114129798},
+        {125920303, 113968193},
+        {128551208, 111866195},
+        {129075592, 111443199},
+        {135044692, 106572608},
+        {135254898, 106347694},
+        {135415100, 106102897},
+        {136121704, 103779891},
+        {136325103, 103086303},
+        {136690093, 101284896},
+        {136798309, 97568496},
+        {136798309, 97470397},
+        {136787399, 97375297},
+        {136753295, 97272102},
+        {136687988, 97158699},
+        {136539794, 96946899},
+        {135526702, 95550994},
+        {135388488, 95382293},
+        {135272491, 95279098},
+        {135214904, 95250595},
+        {135122894, 95218002},
+        {134966705, 95165191},
+        {131753997, 94380798},
+        {131226806, 94331001},
+        {129603393, 94193893},
+        {129224197, 94188003},
+        {127874107, 94215103},
+        {126812797, 94690200},
+        {126558197, 94813896},
+        {118361801, 99824195},
+        {116550796, 101078796},
+        {116189704, 101380493},
+        {114634002, 103027999},
+        {114118103, 103820297},
+        {113399200, 105568000},
+        {113201705, 106093597},
+        {113210205, 107034095},
+    },
+    {
+        {77917999, 130563003},
+        {77926300, 131300903},
+        {77990196, 132392700},
+        {78144195, 133328002},
+        {78170593, 133427093},
+        {78235900, 133657592},
+        {78799598, 135466705},
+        {78933296, 135832397},
+        {79112899, 136247604},
+        {79336303, 136670898},
+        {79585197, 137080596},
+        {79726303, 137309005},
+        {79820297, 137431900},
+        {79942199, 137549407},
+        {90329193, 145990203},
+        {90460197, 146094390},
+        {90606399, 146184509},
+        {90715194, 146230010},
+        {90919601, 146267211},
+        {142335296, 153077697},
+        {143460296, 153153594},
+        {143976593, 153182189},
+        {145403991, 153148605},
+        {145562301, 153131195},
+        {145705993, 153102905},
+        {145938796, 153053192},
+        {146134094, 153010101},
+        {146483184, 152920196},
+        {146904693, 152806396},
+        {147180099, 152670196},
+        {147357788, 152581695},
+        {147615295, 152423095},
+        {147782287, 152294708},
+        {149281799, 150908386},
+        {149405303, 150784912},
+        {166569305, 126952499},
+        {166784301, 126638099},
+        {166938491, 126393699},
+        {167030899, 126245101},
+        {167173004, 126015899},
+        {167415298, 125607200},
+        {167468292, 125504699},
+        {167553100, 125320899},
+        {167584594, 125250694},
+        {167684997, 125004394},
+        {167807098, 124672401},
+        {167938995, 124255203},
+        {168052307, 123694000},
+        {170094100, 112846900},
+        {170118408, 112684204},
+        {172079101, 88437797},
+        {172082000, 88294403},
+        {171916290, 82827606},
+        {171911590, 82705703},
+        {171874893, 82641906},
+        {169867004, 79529907},
+        {155996795, 58147998},
+        {155904998, 58066299},
+        {155864791, 58054199},
+        {134315704, 56830902},
+        {134086486, 56817901},
+        {98200096, 56817798},
+        {97838195, 56818599},
+        {79401695, 56865097},
+        {79291297, 56865501},
+        {79180694, 56869499},
+        {79058799, 56885097},
+        {78937301, 56965301},
+        {78324691, 57374599},
+        {77932998, 57638401},
+        {77917999, 57764297},
+        {77917999, 130563003},
+    },
+    {
+        {75566848, 109289947},
+        {75592651, 109421951},
+        {75644248, 109534446},
+        {95210548, 141223846},
+        {95262649, 141307449},
+        {95487854, 141401443},
+        {95910850, 141511642},
+        {96105651, 141550338},
+        {106015045, 142803451},
+        {106142852, 142815155},
+        {166897460, 139500244},
+        {167019348, 139484741},
+        {168008239, 138823043},
+        {168137542, 138735153},
+        {168156250, 138616851},
+        {173160751, 98882049},
+        {174381546, 87916046},
+        {174412246, 87579048},
+        {174429443, 86988746},
+        {174436141, 86297348},
+        {174438949, 84912048},
+        {174262939, 80999145},
+        {174172546, 80477546},
+        {173847549, 79140846},
+        {173623840, 78294349},
+        {173120239, 76485046},
+        {173067138, 76300544},
+        {173017852, 76137542},
+        {172941543, 75903045},
+        {172892547, 75753143},
+        {172813537, 75533348},
+        {172758453, 75387046},
+        {172307556, 74196746},
+        {171926544, 73192848},
+        {171891448, 73100448},
+        {171672546, 72524147},
+        {171502441, 72085144},
+        {171414459, 71859146},
+        {171294250, 71552352},
+        {171080139, 71019744},
+        {171039245, 70928146},
+        {170970550, 70813346},
+        {170904235, 70704040},
+        {170786254, 70524353},
+        {168063247, 67259048},
+        {167989547, 67184844},
+        {83427947, 67184844},
+        {78360847, 67201248},
+        {78238845, 67220550},
+        {78151550, 67350547},
+        {77574554, 68220550},
+        {77494949, 68342651},
+        {77479949, 68464546},
+        {75648345, 106513351},
+        {75561050, 109165740},
+        {75566848, 109289947},
+    },
+    {
+        {75619415, 108041595},
+        {83609863, 134885772},
+        {83806945, 135450820},
+        {83943908, 135727371},
+        {84799934, 137289794},
+        {86547897, 140033782},
+        {86674118, 140192962},
+        {86810661, 140364715},
+        {87045211, 140619918},
+        {88187042, 141853240},
+        {93924575, 147393783},
+        {94058013, 147454803},
+        {111640083, 153754562},
+        {111762550, 153787933},
+        {111975250, 153835311},
+        {112127426, 153842803},
+        {116797996, 154005157},
+        {116969688, 154010681},
+        {117141731, 154005935},
+        {117333145, 153988037},
+        {118007507, 153919952},
+        {118159675, 153902130},
+        {118931480, 153771942},
+        {120878150, 153379089},
+        {121172164, 153319259},
+        {122074508, 153034362},
+        {122260681, 152970367},
+        {122313438, 152949584},
+        {130755096, 149423736},
+        {130996063, 149316818},
+        {138893524, 144469665},
+        {138896423, 144466918},
+        {169883666, 97686134},
+        {170115036, 96518981},
+        {170144317, 96365257},
+        {174395645, 67672065},
+        {174396560, 67664222},
+        {174288452, 66839241},
+        {174170364, 66096923},
+        {174112731, 65952033},
+        {174021377, 65823486},
+        {173948608, 65743225},
+        {173863830, 65654769},
+        {170408340, 63627494},
+        {170004867, 63394714},
+        {169585632, 63194389},
+        {169441162, 63137046},
+        {168944274, 62952133},
+        {160605072, 60214218},
+        {160331573, 60126396},
+        {159674743, 59916877},
+        {150337249, 56943778},
+        {150267730, 56922073},
+        {150080139, 56864868},
+        {149435333, 56676422},
+        {149310241, 56640579},
+        {148055419, 56285041},
+        {147828796, 56230949},
+        {147598205, 56181800},
+        {147149963, 56093917},
+        {146834457, 56044700},
+        {146727966, 56028717},
+        {146519729, 56004882},
+        {146328521, 55989326},
+        {146170684, 55990036},
+        {146151321, 55990745},
+        {145800170, 56003616},
+        {145639526, 56017753},
+        {145599426, 56022491},
+        {145481338, 56039184},
+        {145389556, 56052757},
+        {145325134, 56062591},
+        {145176574, 56086135},
+        {145017272, 56113922},
+        {107163085, 63504539},
+        {101013870, 65454101},
+        {100921798, 65535285},
+        {95362182, 74174079},
+        {75652366, 107803443},
+        {75635391, 107834983},
+        {75628814, 107853294},
+        {75603431, 107933692},
+        {75619415, 108041595},
+    },
+    {
+        {83617141, 120264900},
+        {84617370, 126416427},
+        {84648635, 126601341},
+        {84693695, 126816085},
+        {84762496, 127082641},
+        {84772140, 127117034},
+        {84860748, 127391693},
+        {84927398, 127550239},
+        {85072967, 127789642},
+        {85155151, 127908851},
+        {86745422, 130042907},
+        {86982666, 130317489},
+        {89975143, 133230743},
+        {90091384, 133338500},
+        {96260833, 138719818},
+        {96713928, 139103668},
+        {98139297, 140307388},
+        {102104766, 143511505},
+        {102142089, 143536468},
+        {102457626, 143735107},
+        {103386764, 144312988},
+        {103845001, 144579177},
+        {104139175, 144737136},
+        {104551254, 144932250},
+        {104690155, 144985778},
+        {104844238, 145010009},
+        {105020034, 145010375},
+        {128999633, 144082305},
+        {129096542, 144076141},
+        {133932327, 143370178},
+        {134130615, 143326751},
+        {134281250, 143289520},
+        {135247116, 142993438},
+        {150774948, 137828704},
+        {150893478, 137786178},
+        {151350921, 137608901},
+        {159797760, 134318115},
+        {159979827, 134244384},
+        {159988128, 134240997},
+        {160035186, 134221633},
+        {160054962, 134211486},
+        {160168762, 134132736},
+        {160181228, 134121047},
+        {160336425, 133961502},
+        {160689147, 133564331},
+        {161446258, 132710739},
+        {163306427, 130611648},
+        {164845474, 128873855},
+        {165270233, 128393600},
+        {165281478, 128380706},
+        {165300598, 128358673},
+        {165303497, 128355194},
+        {166411590, 122772674},
+        {166423767, 122708648},
+        {164745605, 66237312},
+        {164740341, 66193061},
+        {164721755, 66082092},
+        {164721160, 66078750},
+        {164688476, 65914146},
+        {164668426, 65859436},
+        {164563110, 65765937},
+        {164431152, 65715034},
+        {163997619, 65550788},
+        {163946426, 65531440},
+        {162998107, 65173629},
+        {162664978, 65049140},
+        {162482696, 64991668},
+        {162464660, 64989639},
+        {148029083, 66896141},
+        {147862396, 66932853},
+        {130087829, 73341102},
+        {129791564, 73469726},
+        {100590927, 90307685},
+        {100483535, 90373847},
+        {100364990, 90458930},
+        {96447448, 93276664},
+        {95179656, 94189010},
+        {93692718, 95260208},
+        {87904327, 99430885},
+        {87663711, 99606147},
+        {87576202, 99683990},
+        {87498199, 99801719},
+        {85740264, 104173728},
+        {85538925, 104710494},
+        {84786132, 107265830},
+        {84635955, 107801383},
+        {84619506, 107868064},
+        {84518463, 108287200},
+        {84456848, 108613471},
+        {84419158, 108826194},
+        {84375244, 109093818},
+        {84329818, 109435180},
+        {84249862, 110179664},
+        {84218429, 110572166},
+        {83630020, 117995208},
+        {83595535, 118787673},
+        {83576217, 119290679},
+        {83617141, 120264900},
+    },
+    {
+        {91735549, 117640846},
+        {91748252, 117958145},
+        {91823547, 118515449},
+        {92088752, 119477249},
+        {97995346, 140538452},
+        {98031051, 140660446},
+        {98154449, 141060241},
+        {98179855, 141133758},
+        {98217056, 141232849},
+        {98217147, 141233047},
+        {98269256, 141337051},
+        {98298950, 141387954},
+        {98337753, 141445755},
+        {99455047, 142984451},
+        {99656250, 143247344},
+        {102567855, 146783752},
+        {102685150, 146906845},
+        {102828948, 147031250},
+        {102972457, 147120452},
+        {103676147, 147539642},
+        {103758956, 147586151},
+        {103956756, 147682144},
+        {104479949, 147931457},
+        {104744453, 148044143},
+        {104994750, 148123443},
+        {105375648, 148158645},
+        {109266250, 148178253},
+        {109447753, 148169052},
+        {109693649, 148129150},
+        {113729949, 147337448},
+        {113884552, 147303054},
+        {115155349, 146956146},
+        {117637145, 146174346},
+        {154694046, 134048049},
+        {156979949, 133128555},
+        {157076843, 133059356},
+        {157125045, 133001449},
+        {157561340, 132300750},
+        {157865753, 131795959},
+        {157923156, 131667358},
+        {158007049, 131297653},
+        {158112747, 130777053},
+        {158116653, 130640853},
+        {158268951, 119981643},
+        {158260040, 119824752},
+        {158229949, 119563751},
+        {149914047, 73458648},
+        {149877548, 73331748},
+        {144460754, 66413558},
+        {144230545, 66153152},
+        {144128051, 66075057},
+        {143974853, 65973152},
+        {142812744, 65353149},
+        {141810943, 64837249},
+        {141683349, 64805152},
+        {141505157, 64784652},
+        {108214355, 61896251},
+        {107826354, 61866352},
+        {107072151, 61821750},
+        {106938850, 61873550},
+        {106584251, 62055152},
+        {106419952, 62147548},
+        {100459152, 65546951},
+        {100343849, 65615150},
+        {100198852, 65716949},
+        {99825149, 65979751},
+        {94619247, 70330352},
+        {94492355, 70480850},
+        {94445846, 70547355},
+        {94425354, 70588752},
+        {94379753, 70687652},
+        {94110252, 71443450},
+        {94095252, 71569053},
+        {91737251, 117308746},
+        {91731048, 117430946},
+        {91735549, 117640846},
+    },
+    {
+        {108231399, 111763748},
+        {108335403, 111927955},
+        {108865203, 112754745},
+        {109206703, 113283851},
+        {127117500, 125545951},
+        {127212097, 125560951},
+        {127358497, 125563652},
+        {131348007, 125551147},
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+        {77563247, 126586669},
+        {77755004, 128712387},
+    },
+    {
+        {105954101, 131182754},
+        {105959197, 131275848},
+        {105972801, 131473556},
+        {105981498, 131571044},
+        {106077903, 132298553},
+        {106134094, 132715255},
+        {106155700, 132832351},
+        {106180099, 132942657},
+        {106326797, 133590347},
+        {106375099, 133719345},
+        {106417602, 133829345},
+        {106471000, 133930343},
+        {106707901, 134308654},
+        {106728401, 134340545},
+        {106778198, 134417556},
+        {106832397, 134491851},
+        {106891296, 134562957},
+        {106981300, 134667358},
+        {107044204, 134736557},
+        {107111000, 134802658},
+        {107180999, 134865661},
+        {107291099, 134961349},
+        {107362998, 135020355},
+        {107485397, 135112854},
+        {107558998, 135166946},
+        {107690399, 135256256},
+        {107765098, 135305252},
+        {107903594, 135390548},
+        {108183898, 135561843},
+        {108459503, 135727951},
+        {108532501, 135771850},
+        {108796096, 135920059},
+        {108944099, 135972549},
+        {109102401, 136010757},
+        {109660598, 136071044},
+        {109971595, 136100250},
+        {110209594, 136116851},
+        {110752799, 136122344},
+        {111059906, 136105758},
+        {111152900, 136100357},
+        {111237197, 136091354},
+        {111316101, 136075057},
+        {111402000, 136050949},
+        {111475296, 136026657},
+        {143546600, 123535949},
+        {143899002, 122454353},
+        {143917404, 122394348},
+        {143929199, 122354652},
+        {143944793, 122295753},
+        {143956207, 122250953},
+        {143969497, 122192253},
+        {143980102, 122143249},
+        {143991302, 122083053},
+        {144000396, 122031753},
+        {144009796, 121970954},
+        {144017303, 121917655},
+        {144025405, 121850250},
+        {144030609, 121801452},
+        {144036804, 121727455},
+        {144040008, 121683456},
+        {144043502, 121600952},
+        {144044708, 121565048},
+        {144045700, 121470352},
+        {144045898, 121446952},
+        {144041503, 121108657},
+        {144037506, 121023452},
+        {143733795, 118731750},
+        {140461395, 95238647},
+        {140461105, 95236755},
+        {140433807, 95115249},
+        {140392608, 95011650},
+        {134840805, 84668952},
+        {134824996, 84642456},
+        {134781494, 84572952},
+        {134716796, 84480850},
+        {127473899, 74425453},
+        {127467002, 74417152},
+        {127431701, 74381652},
+        {127402603, 74357147},
+        {127375503, 74334457},
+        {127294906, 74276649},
+        {127181900, 74207649},
+        {127177597, 74205451},
+        {127123901, 74178451},
+        {127078903, 74155853},
+        {127028999, 74133148},
+        {126870803, 74070953},
+        {126442901, 73917648},
+        {126432403, 73914955},
+        {126326004, 73889846},
+        {126262405, 73880645},
+        {126128097, 73878456},
+        {125998199, 73877655},
+        {108701095, 74516647},
+        {108644599, 74519348},
+        {108495201, 74528953},
+        {108311302, 74556457},
+        {108252799, 74569458},
+        {108079002, 74612152},
+        {107981399, 74638954},
+        {107921295, 74657951},
+        {107862197, 74685951},
+        {107601303, 74828948},
+        {107546997, 74863449},
+        {107192794, 75098846},
+        {107131202, 75151153},
+        {106260002, 76066146},
+        {106195098, 76221145},
+        {106168502, 76328453},
+        {106144699, 76437454},
+        {106124496, 76538452},
+        {106103698, 76649650},
+        {106084197, 76761650},
+        {106066299, 76874450},
+        {106049903, 76987457},
+        {106034797, 77101150},
+        {106020904, 77214950},
+        {106008201, 77328948},
+        {105996902, 77443145},
+        {105986099, 77565849},
+        {105977005, 77679649},
+        {105969299, 77793151},
+        {105963096, 77906349},
+        {105958297, 78019149},
+        {105955299, 78131454},
+        {105954101, 78242950},
+        {105954101, 131182754},
+    },
+    {
+        {91355499, 77889205},
+        {114834197, 120804504},
+        {114840301, 120815200},
+        {124701507, 132324798},
+        {124798805, 132436706},
+        {124901504, 132548309},
+        {125126602, 132788909},
+        {125235000, 132901901},
+        {125337707, 133005401},
+        {125546302, 133184707},
+        {125751602, 133358703},
+        {126133300, 133673004},
+        {126263900, 133775604},
+        {126367401, 133855499},
+        {126471908, 133935104},
+        {126596008, 134027496},
+        {127119308, 134397094},
+        {127135101, 134408203},
+        {127433609, 134614303},
+        {127554107, 134695709},
+        {128155395, 135070907},
+        {128274505, 135141799},
+        {129132003, 135573211},
+        {129438003, 135713195},
+        {129556106, 135767196},
+        {131512695, 136648498},
+        {132294509, 136966598},
+        {132798400, 137158798},
+        {133203796, 137294494},
+        {133377410, 137350799},
+        {133522399, 137396606},
+        {133804397, 137480697},
+        {134017807, 137542205},
+        {134288696, 137618408},
+        {134564208, 137680099},
+        {134844696, 137740097},
+        {135202606, 137807098},
+        {135489105, 137849807},
+        {135626800, 137864898},
+        {135766906, 137878692},
+        {135972808, 137895797},
+        {136110107, 137905502},
+        {136235000, 137913101},
+        {136485809, 137907196},
+        {139194305, 136979202},
+        {140318298, 136536209},
+        {140380004, 136505004},
+        {140668197, 136340499},
+        {140724304, 136298904},
+        {140808197, 136228210},
+        {140861801, 136180603},
+        {140917404, 136129104},
+        {140979202, 136045104},
+        {141022903, 135984207},
+        {147591094, 126486999},
+        {147661315, 126356101},
+        {147706100, 126261901},
+        {147749099, 126166000},
+        {147817108, 126007507},
+        {147859100, 125908599},
+        {153693206, 111901100},
+        {153731109, 111807800},
+        {153760894, 111698806},
+        {158641998, 92419303},
+        {158644500, 92263702},
+        {158539703, 92013504},
+        {158499603, 91918899},
+        {158335510, 91626800},
+        {158264007, 91516304},
+        {158216308, 91449203},
+        {158178314, 91397506},
+        {158094299, 91283203},
+        {157396408, 90368202},
+        {157285491, 90224700},
+        {157169906, 90079200},
+        {157050003, 89931304},
+        {156290603, 89006805},
+        {156221099, 88922897},
+        {156087707, 88771003},
+        {155947906, 88620498},
+        {155348602, 88004203},
+        {155113204, 87772796},
+        {154947296, 87609703},
+        {154776306, 87448204},
+        {154588806, 87284301},
+        {153886306, 86716400},
+        {153682403, 86560501},
+        {152966705, 86032402},
+        {152687805, 85828704},
+        {152484313, 85683204},
+        {152278808, 85539001},
+        {150878204, 84561401},
+        {150683013, 84426498},
+        {150599395, 84372703},
+        {150395599, 84243202},
+        {149988906, 83989395},
+        {149782897, 83864501},
+        {149568908, 83739799},
+        {148872100, 83365303},
+        {148625396, 83242202},
+        {128079010, 73079605},
+        {127980506, 73031005},
+        {126701103, 72407104},
+        {126501701, 72312202},
+        {126431503, 72280601},
+        {126311706, 72230606},
+        {126260101, 72210899},
+        {126191902, 72187599},
+        {126140106, 72170303},
+        {126088203, 72155303},
+        {126036102, 72142700},
+        {125965904, 72126899},
+        {125913009, 72116600},
+        {125859603, 72108505},
+        {125788101, 72100296},
+        {125733505, 72094398},
+        {125678100, 72090400},
+        {125621398, 72088302},
+        {125548805, 72087303},
+        {125490707, 72086898},
+        {125430908, 72088203},
+        {125369804, 72091094},
+        {125306900, 72095306},
+        {125233505, 72100997},
+        {125168609, 72106506},
+        {125102203, 72113601},
+        {125034103, 72122207},
+        {124964309, 72132095},
+        {124890701, 72143707},
+        {124819305, 72155105},
+        {91355499, 77889099},
+        {91355499, 77889205},
+    },
+    {
+        {84531845, 127391708},
+        {84916946, 130417510},
+        {86133247, 131166900},
+        {86338447, 131292892},
+        {86748847, 131544799},
+        {102193946, 136599502},
+        {103090942, 136796798},
+        {103247146, 136822509},
+        {104083549, 136911499},
+        {106119346, 137109802},
+        {106265853, 137122207},
+        {106480247, 137139205},
+        {110257850, 137133605},
+        {116917747, 136131408},
+        {117054946, 136106704},
+        {119043945, 135244293},
+        {119249046, 135154708},
+        {136220947, 126833007},
+        {165896347, 91517105},
+        {166032546, 91314697},
+        {166055435, 91204902},
+        {166056152, 91176803},
+        {166047256, 91100006},
+        {166039733, 91063705},
+        {165814849, 90080802},
+        {165736450, 89837707},
+        {165677246, 89732101},
+        {165676956, 89731803},
+        {165560241, 89629302},
+        {154419952, 82608505},
+        {153822143, 82239700},
+        {137942749, 74046104},
+        {137095245, 73845504},
+        {135751342, 73537704},
+        {134225952, 73208602},
+        {132484344, 72860801},
+        {124730346, 73902000},
+        {120736549, 74464401},
+        {100401245, 78685401},
+        {90574645, 90625701},
+        {90475944, 90748809},
+        {90430747, 90808700},
+        {90321548, 90958305},
+        {90254852, 91077903},
+        {90165641, 91244003},
+        {90134941, 91302398},
+        {84474647, 103745697},
+        {84328048, 104137901},
+        {84288543, 104327606},
+        {84038047, 106164604},
+        {84013351, 106368698},
+        {83943847, 110643203},
+        {84531845, 127391708},
+    },
+};
+
+using Slic3r::ExPolygon;
+using Slic3r::Polygon;
+using Slic3r::Polygons;
+using Slic3r::ExPolygons;
+
+struct MyPoly {
+    ExPolygon poly;
+    MyPoly(Polygon contour, Polygons holes)
+        : poly(std::move(contour))
+    {
+        poly.holes = std::move(holes);
+    }
+
+    operator ExPolygon () { return poly; }
+};
+
+const TestDataEx PRUSA_PART_POLYGONS_EX = {
+    ExPolygons{
+        // "x-carriage.stl":
+        MyPoly{{
+                   {-22097700, -14878600}, {-21981300, -14566100},
+                   {-21807600, -14303900}, {-21354100, -13619200},
+                   {-20514800, -12806600}, {-19500000, -12163900},
+                   {-18553700, -11796600}, {-18354100, -11719200},
+                   {-18146200, -11680600}, {-17127200, -11491800},
+                   {-15872800, -11491800}, {-14853800, -11680600},
+                   {-14645900, -11719200}, {-14446300, -11796600},
+                   {-13500000, -12163900}, {-12485200, -12806600},
+                   {-11645900, -13619200}, {-11192400, -14303900},
+                   {-11018700, -14566100}, {-10902300, -14878600},
+                   {-10857000, -15000000}, {-2200000, -15000000},
+                   {-2242640, -14957400},  {500000, -12214700},
+                   {500000, 5500000},      {9450000, 5500000},
+                   {9450000, 7500000},     {273885, 7500000},
+                   {273885, 11050000},     {2706110, 11050000},
+                   {2706110, 11000000},    {9500000, 11000000},
+                   {9500000, 66500000},    {7466310, 68533696},
+                   {999999, 75000000},     {-8500000, 75000000},
+                   {-8500000, 74250000},   {-7500000, 74250000},
+                   {-7500000, 71750000},   {-8500000, 71750000},
+                   {-8500000, 68250000},   {-7500000, 68250000},
+                   {-7500000, 65750000},   {-8500000, 65750000},
+                   {-8500000, 64000000},   {-12500000, 64000000},
+                   {-12500000, 67000000},  {-14500000, 67000000},
+                   {-14500000, 73000000},  {-12500000, 73000000},
+                   {-12500000, 75000000},  {-23000000, 75000000},
+                   {-23000000, 59500000},  {-38500000, 59500000},
+                   {-42500000, 55500000},  {-42500000, 19536000},
+                   {-36767700, 18000000},  {-34000000, 18000000},
+                   {-34000000, 13000000},  {-39900000, 13000000},
+                   {-39900000, 11000000},  {-34000000, 11000000},
+                   {-34000000, 7500000},   {-39900000, 7500000},
+                   {-39900000, 5500000},   {-34000000, 5500000},
+                   {-34000000, -11714700}, {-30757400, -14957400},
+                   {-30800000, -15000000}, {-22143000, -15000000},
+               },
+               {
+                   {
+                       {2311850, 65709900}, {2076590, 65759904},
+                       {1943770, 65788100}, {1600000, 65941200},
+                       {1362567, 66113636}, {1329590, 66137604},
+                       {1295560, 66162300}, {1043769, 66442000},
+                       {855618, 66767900},  {739334, 67125800},
+                       {714193, 67365000},  {700000, 67500000},
+                       {714193, 67635000},  {739334, 67874200},
+                       {855618, 68232104},  {1043769, 68558000},
+                       {1295560, 68837696}, {1329590, 68862400},
+                       {1352596, 68879119}, {1600000, 69058800},
+                       {1943770, 69211896}, {2076590, 69240096},
+                       {2311850, 69290104}, {2688150, 69290104},
+                       {3056230, 69211896}, {3400000, 69058800},
+                       {3541910, 68955704}, {3704430, 68837696},
+                       {3762210, 68773496}, {3865370, 68658896},
+                       {3956230, 68558000}, {4024119, 68440400},
+                       {4065821, 68368176}, {4144380, 68232104},
+                       {4260660, 67874200}, {4300000, 67500000},
+                       {4260660, 67125800}, {4144380, 66767900},
+                       {4024119, 66559600}, {3956230, 66442000},
+                       {3865370, 66341104}, {3762210, 66226500},
+                       {3704430, 66162300}, {3541910, 66044296},
+                       {3400000, 65941200}, {3056230, 65788100},
+                       {2688150, 65709900},
+                   },
+                   {
+                       {-27606700, 54303400}, {-27818500, 54330100},
+                       {-27896000, 54350000}, {-28025300, 54383200},
+                       {-28223800, 54461800}, {-28410900, 54564600},
+                       {-28583600, 54690100}, {-28739200, 54836300},
+                       {-28875300, 55000800}, {-28989700, 55181000},
+                       {-29080600, 55374200}, {-29146600, 55577200},
+                       {-29150000, 55595100}, {-29186600, 55786900},
+                       {-29200000, 56000000}, {-29186600, 56213100},
+                       {-29150000, 56404900}, {-29146600, 56422800},
+                       {-29080600, 56625800}, {-28989700, 56819000},
+                       {-28875300, 56999200}, {-28739200, 57163700},
+                       {-28583600, 57309900}, {-28410900, 57435400},
+                       {-28223800, 57538200}, {-28025300, 57616800},
+                       {-27896000, 57650000}, {-27818500, 57669900},
+                       {-27606700, 57696600}, {-27393300, 57696600},
+                       {-27181400, 57669900}, {-27104000, 57650000},
+                       {-26974700, 57616800}, {-26776200, 57538200},
+                       {-26589100, 57435400}, {-26416400, 57309900},
+                       {-26260800, 57163700}, {-26124700, 56999200},
+                       {-26010300, 56819000}, {-25919400, 56625800},
+                       {-25853400, 56422800}, {-25850000, 56404900},
+                       {-25813400, 56213100}, {-25800000, 56000000},
+                       {-25813400, 55786900}, {-25850000, 55595100},
+                       {-25853400, 55577200}, {-25919400, 55374200},
+                       {-26010300, 55181000}, {-26124700, 55000800},
+                       {-26260800, 54836300}, {-26416400, 54690100},
+                       {-26589100, 54564600}, {-26776200, 54461800},
+                       {-26974700, 54383200}, {-27104000, 54350000},
+                       {-27181400, 54330100}, {-27393300, 54303400},
+                   },
+                   {
+                       {-4106740, 54303400}, {-4318550, 54330100},
+                       {-4396010, 54350000}, {-4525330, 54383200},
+                       {-4723820, 54461800}, {-4910900, 54564600},
+                       {-5083620, 54690100}, {-5239250, 54836300},
+                       {-5375330, 55000800}, {-5489720, 55181000},
+                       {-5580620, 55374200}, {-5646590, 55577200},
+                       {-5650000, 55595100}, {-5686590, 55786900},
+                       {-5700000, 56000000}, {-5686590, 56213100},
+                       {-5650000, 56404900}, {-5646590, 56422800},
+                       {-5580620, 56625800}, {-5489720, 56819000},
+                       {-5375330, 56999200}, {-5239250, 57163700},
+                       {-5083620, 57309900}, {-4910900, 57435400},
+                       {-4723820, 57538200}, {-4525330, 57616800},
+                       {-4396010, 57650000}, {-4318550, 57669900},
+                       {-4106740, 57696600}, {-3893260, 57696600},
+                       {-3681450, 57669900}, {-3603990, 57650000},
+                       {-3474670, 57616800}, {-3276170, 57538200},
+                       {-3089090, 57435400}, {-2916380, 57309900},
+                       {-2760750, 57163700}, {-2624670, 56999200},
+                       {-2510280, 56819000}, {-2419380, 56625800},
+                       {-2353410, 56422800}, {-2350000, 56404900},
+                       {-2313400, 56213100}, {-2300000, 56000000},
+                       {-2313400, 55786900}, {-2350000, 55595100},
+                       {-2353410, 55577200}, {-2419380, 55374200},
+                       {-2510280, 55181000}, {-2624670, 55000800},
+                       {-2760750, 54836300}, {-2916380, 54690100},
+                       {-3089090, 54564600}, {-3276170, 54461800},
+                       {-3474670, 54383200}, {-3603990, 54350000},
+                       {-3681450, 54330100}, {-3893260, 54303400},
+                   },
+                   {
+                       {-16103600, 27353300}, {-16309200, 27379200},
+                       {-16509899, 27430800}, {-16702499, 27507000},
+                       {-16884100, 27606900}, {-17051800, 27728700},
+                       {-17202800, 27870500}, {-17334900, 28030200},
+                       {-17445900, 28205100}, {-17534100, 28392600},
+                       {-17598200, 28589700}, {-17637000, 28793200},
+                       {-17650000, 29000000}, {-17637000, 29206800},
+                       {-17598200, 29410300}, {-17534100, 29607400},
+                       {-17445900, 29794900}, {-17334900, 29969800},
+                       {-17202800, 30129500}, {-17051800, 30271300},
+                       {-16884100, 30393100}, {-16702499, 30493000},
+                       {-16509899, 30569200}, {-16309200, 30620800},
+                       {-16103600, 30646700}, {-15896400, 30646700},
+                       {-15690800, 30620800}, {-15490100, 30569200},
+                       {-15297500, 30493000}, {-15115900, 30393100},
+                       {-14948200, 30271300}, {-14797200, 30129500},
+                       {-14665100, 29969800}, {-14554100, 29794900},
+                       {-14465900, 29607400}, {-14401800, 29410300},
+                       {-14363000, 29206800}, {-14350000, 29000000},
+                       {-14363000, 28793200}, {-14401800, 28589700},
+                       {-14465900, 28392600}, {-14554100, 28205100},
+                       {-14665100, 28030200}, {-14797200, 27870500},
+                       {-14948200, 27728700}, {-15115900, 27606900},
+                       {-15297500, 27507000}, {-15490100, 27430800},
+                       {-15690800, 27379200}, {-15896400, 27353300},
+                   },
+                   {
+                       {-5809180, 22879200}, {-6202540, 23007000},
+                       {-6551750, 23228700}, {-6834880, 23530200},
+                       {-7034130, 23892600}, {-7136990, 24293200},
+                       {-7136990, 24706800}, {-7034130, 25107400},
+                       {-6834880, 25469800}, {-6551750, 25771300},
+                       {-6202540, 25993000}, {-5809180, 26120800},
+                       {-5396390, 26146700}, {-4990120, 26069200},
+                       {-4615890, 25893100}, {-4297200, 25629500},
+                       {-4054090, 25294900}, {-3901840, 24910300},
+                       {-3850000, 24500000}, {-3901840, 24089700},
+                       {-4054090, 23705100}, {-4297200, 23370500},
+                       {-4615890, 23106900}, {-4990120, 22930800},
+                       {-5396390, 22853300},
+                   },
+                   {
+                       {-28809200, 22879200}, {-29202500, 23007000},
+                       {-29551800, 23228700}, {-29834900, 23530200},
+                       {-30034100, 23892600}, {-30137000, 24293200},
+                       {-30137000, 24706800}, {-30034100, 25107400},
+                       {-29834900, 25469800}, {-29551800, 25771300},
+                       {-29202500, 25993000}, {-28809200, 26120800},
+                       {-28396400, 26146700}, {-27990100, 26069200},
+                       {-27615900, 25893100}, {-27297200, 25629500},
+                       {-27054100, 25294900}, {-26901800, 24910300},
+                       {-26850000, 24500000}, {-26901800, 24089700},
+                       {-27054100, 23705100}, {-27297200, 23370500},
+                       {-27615900, 23106900}, {-27990100, 22930800},
+                       {-28396400, 22853300},
+                   },
+                   {
+                       {-15718329, 8800000},
+                       {-15729700, 8808230},
+                       {-15736300, 8814060},
+                       {-15742800, 8833890},
+                       {-15876410, 9243607},
+                       {-15729700, 9696850},
+                       {-14969700, 10251100},
+                       {-14030300, 10251100},
+                       {-13270300, 9696850},
+                       {-13123590, 9243607},
+                       {-13257200, 8833890},
+                       {-13263700, 8814060},
+                       {-13270300, 8808230},
+                       {-13281671, 8800000},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "Spool-holder.stl":
+        MyPoly{{
+                   {338485792, -31307222}, {338867040, -31018436},
+                   {339248320, -30729652}, {339769915, -30334566},
+                   {340010848, -30152082}, {340392096, -29863298},
+                   {340773344, -29574512}, {341244704, -27899436},
+                   {341480384, -27061900}, {342060734, -24999444},
+                   {342187424, -24549286}, {343068058, -21419626},
+                   {343130112, -21199134}, {343521972, -19806477},
+                   {344953440, -14719350}, {345583712, -12479458},
+                   {345898880, -11359512}, {346213984, -10239566},
+                   {346529152, -9119620},  {346684120, -8568830},
+                   {347258496, -6527694},  {348879776, -765989},
+                   {351121248, 7199785},   {351160318, 7338666},
+                   {351581888, 8836852},   {358349952, 32889144},
+                   {361733984, 44915292},  {362502080, 47644968},
+                   {365226370, 57326618},  {367181933, 64276284},
+                   {369782208, 73517048},  {372004549, 81414857},
+                   {375270080, 93019880},  {377062304, 99389120},
+                   {380702368, 112325160}, {387982496, 138197232},
+                   {390913664, 148614048}, {392379232, 153822448},
+                   {392462848, 154165648}, {392500992, 154371968},
+                   {392523776, 154527056}, {392558720, 154903888},
+                   {392560704, 154943056}, {392564832, 155292544},
+                   {392554016, 155525040}, {392539872, 155688624},
+                   {392482592, 156087152}, {392479040, 156106240},
+                   {392392608, 156482704}, {392336512, 156674688},
+                   {392270816, 156869776}, {392130112, 157218896},
+                   {392119264, 157242992}, {391941088, 157597536},
+                   {391865920, 157728704}, {391740320, 157929344},
+                   {391551872, 158195776}, {391521632, 158235296},
+                   {391290048, 158513360}, {391187328, 158624592},
+                   {391050656, 158762640}, {390808320, 158983152},
+                   {390768160, 159017008}, {390567456, 159175840},
+                   {390331776, 159342352}, {390300192, 159363104},
+                   {389874464, 159612112}, {389791584, 159654240},
+                   {389337216, 159852608}, {389252448, 159883872},
+                   {388769664, 160029808}, {388694016, 160047936},
+                   {388177408, 160139328}, {388128128, 160145120},
+                   {387566176, 160176800}, {375407744, 160176800},
+                   {374915072, 160152480}, {374676896, 160123104},
+                   {374431712, 160080592}, {374176224, 160022768},
+                   {373936576, 159955472}, {373914144, 159948512},
+                   {373647424, 159856688}, {373378176, 159746368},
+                   {373213376, 159669552}, {373108832, 159616976},
+                   {372841920, 159468256}, {372580064, 159300432},
+                   {372535328, 159269408}, {372325888, 159114096},
+                   {372081888, 158910256}, {371928512, 158767776},
+                   {371850368, 158690384}, {371633408, 158456224},
+                   {371432736, 158209856}, {371413792, 158184848},
+                   {371249664, 157953552}, {371085088, 157689664},
+                   {371004448, 157545600}, {370939520, 157420656},
+                   {370813088, 157148864}, {370705536, 156876560},
+                   {368543808, 150896416}, {363439712, 136776352},
+                   {358631104, 123473712}, {358408023, 122856568},
+                   {356409504, 117327816}, {355922364, 115980139},
+                   {355915437, 115960977}, {352669088, 106980280},
+                   {351986938, 105093166}, {351083520, 102593952},
+                   {349781616, 98992320},  {348098080, 94334952},
+                   {340262048, 72657256},  {338954668, 69040480},
+                   {336962208, 63528480},  {332255104, 50506656},
+                   {327202016, 36527760},  {322789144, 24319856},
+                   {322760544, 24240790},  {322533686, 23613197},
+                   {322519552, 23574124},  {320672032, 18463012},
+                   {320578304, 18203810},  {320531456, 18074210},
+                   {320484608, 17944606},  {320437760, 17815006},
+                   {320297248, 17426202},  {320297248, 9238203},
+                   {321164066, 9238176},   {321689312, 9238155},
+                   {323777376, 9238073},   {324473408, 9238046},
+                   {325169440, 9238018},   {325496384, 10782991},
+                   {325496360, 12868520},  {327892320, 12868504},
+                   {329090336, 12868496},  {330288320, 12868487},
+                   {331486336, 12868480},  {332684279, 12868472},
+                   {332096736, 10092249},  {332096736, -26761938},
+                   {325697024, -26761692}, {325697024, -26311692},
+                   {324897056, -26311692}, {323897056, -27061692},
+                   {323897056, -29536704}, {323897088, -30511784},
+                   {323897088, -32461944}, {323897091, -32461944},
+                   {328084288, -32462100}, {329480000, -32462150},
+                   {332271456, -32462258}, {335062912, -32462360},
+                   {336960768, -32462360},
+               },
+               {
+                   {
+                       {376588032, 136952960}, {375810912, 137178704},
+                       {375411104, 137361136}, {375032960, 137582800},
+                       {374679360, 137841776}, {374353152, 138136224},
+                       {374058688, 138462448}, {373799680, 138816048},
+                       {373578048, 139194192}, {373395584, 139594016},
+                       {373169856, 140371136}, {373093728, 141176800},
+                       {373169856, 141982464}, {373395584, 142759600},
+                       {373578048, 143159392}, {373799680, 143537536},
+                       {374058688, 143891136}, {374353152, 144217360},
+                       {374679360, 144511824}, {375032960, 144770816},
+                       {375411104, 144992464}, {375810912, 145174896},
+                       {376588032, 145400656}, {377393696, 145476800},
+                       {378199360, 145400656}, {378976512, 145174896},
+                       {379376320, 144992480}, {379754464, 144770816},
+                       {380108064, 144511808}, {380434272, 144217360},
+                       {380728736, 143891136}, {380987744, 143537536},
+                       {381209376, 143159392}, {381391776, 142759600},
+                       {381617568, 141982464}, {381693696, 141176800},
+                       {381617568, 140371136}, {381391776, 139594000},
+                       {381209376, 139194192}, {380987744, 138816064},
+                       {380728736, 138462464}, {380434272, 138136240},
+                       {380108064, 137841792}, {379754464, 137582800},
+                       {379376320, 137361136}, {378976512, 137178704},
+                       {378199360, 136952960}, {377393696, 136876800},
+                   },
+                   {
+                       {354604704, 97626944},  {355293600, 99532704},
+                       {355982496, 101438472}, {356671392, 103344232},
+                       {357360288, 105250000}, {358424054, 108192839},
+                       {358738080, 109061520}, {359426976, 110967296},
+                       {360115840, 112873056}, {362111392, 113825960},
+                       {368097952, 116684672}, {370093472, 117637584},
+                       {372089024, 118590488}, {374084544, 119543392},
+                       {378075584, 121449192}, {377003072, 117637704},
+                       {375930560, 113826200}, {375394304, 111920456},
+                       {374321792, 108108952}, {373249280, 104297464},
+                       {368952928, 102391616}, {362508448, 99532856},
+                       {360360288, 98579944},  {358212128, 97627024},
+                       {356063968, 96674096},  {353915808, 95721176},
+                   },
+                   {
+                       {342204640, 63323192}, {342893536, 65228960},
+                       {344271328, 69040480}, {344960192, 70946248},
+                       {345649120, 72852016}, {346338016, 74757776},
+                       {347026880, 76663536}, {347715776, 78569304},
+                       {354618176, 81428112}, {356918976, 82381040},
+                       {359219776, 83333976}, {361520576, 84286920},
+                       {363821376, 85239856}, {366122176, 86192784},
+                       {368422976, 87145720}, {367886720, 85239976},
+                       {366814208, 81428472}, {366277952, 79522728},
+                       {365741664, 77616984}, {365205408, 75711224},
+                       {364132896, 71899736}, {363596640, 69993984},
+                       {361143232, 69041032}, {356236352, 67135128},
+                       {353782944, 66182184}, {351329504, 65229232},
+                       {348876064, 64276284}, {346422592, 63323328},
+                       {343969184, 62370380}, {341515744, 61417428},
+                   },
+                   {
+                       {329804576, 29019442}, {330493472, 30925208},
+                       {331182368, 32830970}, {331871232, 34736732},
+                       {332560160, 36642500}, {333249056, 38548264},
+                       {333937920, 40454024}, {334626816, 42359792},
+                       {335315744, 44265552}, {337921792, 45218520},
+                       {340527872, 46171484}, {343133952, 47124452},
+                       {345740000, 48077416}, {348346080, 49030384},
+                       {350952160, 49983348}, {353558208, 50936312},
+                       {356164288, 51889284}, {358770368, 52842248},
+                       {358234112, 50936496}, {357697856, 49030752},
+                       {357161568, 47125000}, {356089056, 43313504},
+                       {355552800, 41407752}, {355016544, 39502008},
+                       {354480288, 37596256}, {353944032, 35690508},
+                       {351185344, 34737524}, {348426624, 33784544},
+                       {345667904, 32831566}, {342909216, 31878584},
+                       {340150528, 30925604}, {334633088, 29019640},
+                       {331874400, 28066660}, {329115680, 27113678},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "x-end-idler.stl":
+        MyPoly{{
+                   {-6500000, -10475000}, {0, -10475000},
+                   {0, -10468600},        {365572, -10468600},
+                   {1094940, -10417600},  {1818960, -10315900},
+                   {2534130, -10163800},  {3236950, -9962320},
+                   {3924000, -9712250},   {4591940, -9414870},
+                   {5237500, -9071620},   {5857540, -8684170},
+                   {6449050, -8254410},   {7009140, -7784440},
+                   {7535080, -7276550},   {8024310, -6733200},
+                   {8474450, -6157050},   {8883300, -5550900},
+                   {9248880, -4917710},   {9569390, -4260570},
+                   {9843280, -3582660},   {10069200, -2887300},
+                   {10246100, -2177870},  {10373100, -1457840},
+                   {10449500, -730699},   {10475000, 0},
+                   {10449500, 730699},    {10373100, 1457840},
+                   {10246100, 2177870},   {10069200, 2887300},
+                   {9843280, 3582660},    {9569390, 4260570},
+                   {9248880, 4917710},    {8883300, 5550900},
+                   {8474450, 6157050},    {8024310, 6733200},
+                   {7739860, 7049120},    {8047300, 7272490},
+                   {9203020, 8357790},    {10213600, 9579380},
+                   {11063100, 10918000},  {11738200, 12352500},
+                   {12228100, 13860400},  {12525200, 15417700},
+                   {12624700, 17000000},  {12525200, 18582300},
+                   {12228100, 20139600},  {11738200, 21647500},
+                   {11063100, 23082000},  {10213600, 24420600},
+                   {9203020, 25642200},   {8047300, 26727500},
+                   {6764660, 27659400},   {5375340, 28423200},
+                   {3901250, 29006800},   {2365630, 29401100},
+                   {792712, 29599800},    {-792712, 29599800},
+                   {-2365630, 29401100},  {-3901250, 29006800},
+                   {-5181320, 28500000},  {-23500000, 28500000},
+                   {-23500000, -9000000}, {-22000000, -10500000},
+                   {-6500000, -10500000},
+               },
+               {
+                   {
+                       {6562230, 22074800}, {6357580, 22107300},
+                       {6158600, 22165100}, {5968430, 22247400},
+                       {5790080, 22352800}, {5626350, 22479800},
+                       {5479830, 22626400}, {5352830, 22790100},
+                       {5247350, 22968400}, {5165060, 23158600},
+                       {5107250, 23357600}, {5074840, 23562200},
+                       {5068330, 23769300}, {5087830, 23975600},
+                       {5133030, 24177800}, {5203220, 24372800},
+                       {5297290, 24557400}, {5413760, 24728800},
+                       {5550790, 24884200}, {5706220, 25021300},
+                       {5877600, 25137700}, {6062220, 25231800},
+                       {6257180, 25302000}, {6459400, 25347200},
+                       {6665690, 25366700}, {6872790, 25360200},
+                       {7077450, 25327800}, {7276430, 25270000},
+                       {7466600, 25187700}, {7644950, 25082200},
+                       {7808680, 24955200}, {7955200, 24808700},
+                       {8082200, 24645000}, {8187670, 24466600},
+                       {8269970, 24276400}, {8327780, 24077400},
+                       {8360190, 23872800}, {8366700, 23665700},
+                       {8347200, 23459400}, {8302000, 23257200},
+                       {8231809, 23062200}, {8137740, 22877600},
+                       {8021270, 22706200}, {7884240, 22550800},
+                       {7728810, 22413800}, {7557430, 22297300},
+                       {7372810, 22203200}, {7177850, 22133000},
+                       {6975630, 22087800}, {6769340, 22068300},
+                   },
+                   {
+                       {1094940, 10417600},  {365572, 10468600},
+                       {0, 10468600},        {0, 10475000},
+                       {-1431080, 10475000}, {-6000000, 15108169},
+                       {-6000000, 19962102}, {-5802370, 20350000},
+                       {-5420410, 20938200}, {-4979070, 21483200},
+                       {-4483170, 21979100}, {-3938160, 22420400},
+                       {-3350000, 22802400}, {-2725130, 23120800},
+                       {-2070410, 23372100}, {-1393010, 23553600},
+                       {-700340, 23663300},  {0, 23700000},
+                       {700340, 23663300},   {1393010, 23553600},
+                       {2070410, 23372100},  {2725130, 23120800},
+                       {3350000, 22802400},  {3938160, 22420400},
+                       {4483170, 21979100},  {4979070, 21483200},
+                       {5420410, 20938200},  {5802370, 20350000},
+                       {6120750, 19725100},  {6372080, 19070400},
+                       {6553590, 18393000},  {6663300, 17700300},
+                       {6700000, 17000000},  {6663300, 16299700},
+                       {6553590, 15607000},  {6372080, 14929600},
+                       {6120750, 14274900},  {5802370, 13650000},
+                       {5420410, 13061800},  {4979070, 12516800},
+                       {4483170, 12020900},  {3938160, 11579600},
+                       {3350000, 11197600},  {2725130, 10879200},
+                       {2070410, 10627900},  {1393010, 10446400},
+                       {1156540, 10409000},
+                   },
+                   {
+                       {-1455380, -6847030}, {-2847160, -6394820},
+                       {-4114500, -5663120}, {-5202010, -4683910},
+                       {-6062180, -3500000}, {-6657400, -2163120},
+                       {-6961650, -731699},  {-6961650, 731699},
+                       {-6657400, 2163120},  {-6062180, 3500000},
+                       {-5202010, 4683910},  {-4114500, 5663120},
+                       {-2847160, 6394820},  {-1455380, 6847030},
+                       {0, 7000000},         {1455380, 6847030},
+                       {2847160, 6394820},   {4114500, 5663120},
+                       {5018810, 4848870},   {5421400, 5186681},
+                       {5472037, 5130444},   {6083180, 4451690},
+                       {6090937, 4443078},   {6007070, 4372710},
+                       {5647390, 4070900},   {6062180, 3500000},
+                       {6657400, 2163120},   {6961650, 731699},
+                       {6961650, -731699},   {6657400, -2163120},
+                       {6062180, -3500000},  {5202010, -4683910},
+                       {4114500, -5663120},  {2847160, -6394820},
+                       {1455380, -6847030},  {0, -7000000},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "Einsy-hinges.stl":
+        MyPoly{
+            {
+                {865247, 3337040},   {1400000, 3575130},   {1873570, 3919190},
+                {2265250, 4354200},  {2557930, 4861140},   {2738810, 5417850},
+                {2762880, 5646830},  {2785290, 5860020},   {2786450, 5871067},
+                {2796080, 5962680},  {2800000, 6000000},   {2738810, 6582150},
+                {2728530, 6613790},  {2344020, 7279790},   {2195738, 7536616},
+                {1639530, 8500000},  {1552105, 8651421},   {935040, 9720210},
+                {621454, 10263400},  {-3267950, 17000000}, {-5000000, 17000000},
+                {-5000000, 6000000}, {-2800000, 6000000},  {-2738810, 5417850},
+                {-2557930, 4861140}, {-2265250, 4354200},  {-1873570, 3919190},
+                {-1400000, 3575130}, {-865247, 3337040},   {-292679, 3215340},
+                {292679, 3215340},
+            },
+            {}},
+        MyPoly{{
+                   {412054, -4263360},    {725639, -3720210},
+                   {1315606, -2698356},   {1430130, -2500000},
+                   {2000000, -1512950},   {2000000, -1309600},
+                   {2192510, -976168},    {2347550, -498987},
+                   {2400000, 0},          {2382076, 170521},
+                   {2362880, 353169},     {2349180, 483565},
+                   {2347550, 498987},     {2192510, 976168},
+                   {1941640, 1410680},    {1605910, 1783550},
+                   {1200000, 2078460},    {741640, 2282540},
+                   {250868, 2386850},     {-250868, 2386850},
+                   {-741640, 2282540},    {-1200000, 2078460},
+                   {-1605910, 1783550},   {-1941640, 1410680},
+                   {-2192510, 976168},    {-2347550, 498987},
+                   {-2400000, 0},         {-5000000, 0},
+                   {-5000000, -11000000}, {-3477350, -11000000},
+               },
+               {}},
+    },
+    ExPolygons{
+        // "LCD-cover-ORIGINAL-MK3.stl":
+        MyPoly{{
+                   {78000000, -11928900},
+                   {78000000, 51000000},
+                   {73000000, 56000000},
+                   {-72000000, 56000000},
+                   {-77000000, 51000000},
+                   {-77000000, -11928900},
+                   {-74928904, -14000000},
+                   {75928904, -14000000},
+               },
+               {
+                   {
+                       {44000000, 26000000}, {44000000, 31980000},
+                       {43992900, 31987100}, {44000000, 31994200},
+                       {44000000, 32000000}, {44005800, 32000000},
+                       {56000000, 43994200}, {56000000, 44000000},
+                       {56005800, 44000000}, {56013700, 44007900},
+                       {56021600, 44000000}, {69500000, 44000000},
+                       {69500000, 36020800}, {69510400, 36010400},
+                       {63500000, 30000000}, {50900000, 30000000},
+                       {49000000, 28100000}, {49000000, 26000000},
+                       {48000000, 26000000}, {48000000, 28500000},
+                       {47992900, 28507100}, {50503100, 31017300},
+                       {50520500, 31000000}, {63085800, 31000000},
+                       {68500000, 36414200}, {68500000, 43000000},
+                       {56420000, 43000000}, {45000000, 31580000},
+                       {45000000, 26000000},
+                   },
+                   {
+                       {-54500000, 8000000},
+                       {-54500000, 38500000},
+                       {30500000, 38500000},
+                       {30500000, 8000000},
+                   },
+                   {
+                       {61872800, 15032900}, {60645900, 15293700},
+                       {59500000, 15803800}, {58485200, 16541100},
+                       {57645900, 17473300}, {57018700, 18559600},
+                       {56631100, 19752500}, {56500000, 21000000},
+                       {56631100, 22247500}, {57018700, 23440400},
+                       {57645900, 24526700}, {58485200, 25458900},
+                       {59500000, 26196200}, {60645900, 26706300},
+                       {61872800, 26967100}, {63127200, 26967100},
+                       {64354104, 26706300}, {65500000, 26196200},
+                       {66514800, 25458900}, {67354104, 24526700},
+                       {67981304, 23440400}, {68368896, 22247500},
+                       {68500000, 21000000}, {68368896, 19752500},
+                       {67981304, 18559600}, {67354104, 17473300},
+                       {66514800, 16541100}, {65500000, 15803800},
+                       {64354104, 15293700}, {63127200, 15032900},
+                   },
+                   {
+                       {57000000, 1500000},
+                       {57000000, 5500000},
+                       {58300000, 5500000},
+                       {58300000, 1500000},
+                   },
+                   {
+                       {55000000, 1500000},
+                       {55000000, 5500000},
+                       {56300000, 5500000},
+                       {56300000, 1500000},
+                   },
+                   {
+                       {59000000, 1500000},
+                       {59000000, 5500000},
+                       {60300000, 5500000},
+                       {60300000, 1500000},
+                   },
+                   {
+                       {61000000, 1500000},
+                       {61000000, 5500000},
+                       {62300000, 5500000},
+                       {62300000, 1500000},
+                   },
+                   {
+                       {63000000, 1500000},
+                       {63000000, 5500000},
+                       {64300004, 5500000},
+                       {64300004, 1500000},
+                   },
+                   {
+                       {65000000, 1500000},
+                       {65000000, 5500000},
+                       {66300004, 5500000},
+                       {66300004, 1500000},
+                   },
+                   {
+                       {67000000, 1500000},
+                       {67000000, 5500000},
+                       {68300000, 5500000},
+                       {68300000, 1500000},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "x-end-motor.stl":
+        MyPoly{{
+                   {2365630, -29401100},   {3901250, -29006800},
+                   {5375340, -28423200},   {6764660, -27659400},
+                   {8047300, -26727500},   {9203020, -25642200},
+                   {10213600, -24420600},  {11063100, -23082000},
+                   {11738200, -21647500},  {12228100, -20139600},
+                   {12525200, -18582300},  {12624700, -17000000},
+                   {12525200, -15417700},  {12228100, -13860400},
+                   {11738200, -12352500},  {11063100, -10918000},
+                   {10213600, -9579380},   {9203020, -8357790},
+                   {8047300, -7272490},    {7739860, -7049120},
+                   {8024310, -6733200},    {8474450, -6157050},
+                   {8883300, -5550900},    {9248880, -4917710},
+                   {9569390, -4260570},    {9843280, -3582660},
+                   {10069200, -2887300},   {10246100, -2177870},
+                   {10373100, -1457840},   {10449500, -730699},
+                   {10475000, 0},          {10449500, 730699},
+                   {10373100, 1457840},    {10246100, 2177870},
+                   {10069200, 2887300},    {9843280, 3582660},
+                   {9569390, 4260570},     {9248880, 4917710},
+                   {8883300, 5550900},     {8474450, 6157050},
+                   {8024310, 6733200},     {7535080, 7276550},
+                   {7009140, 7784440},     {6449050, 8254410},
+                   {5857540, 8684170},     {5237500, 9071620},
+                   {4591940, 9414870},     {3924000, 9712250},
+                   {3236950, 9962320},     {2534130, 10163800},
+                   {1818960, 10315900},    {1094940, 10417600},
+                   {365572, 10468600},     {0, 10468600},
+                   {0, 10475000},          {-6500000, 10475000},
+                   {-6500000, 53000000},   {-23500000, 53000000},
+                   {-23500000, -28500000}, {-5181320, -28500000},
+                   {-3901250, -29006800},  {-2365630, -29401100},
+                   {-792712, -29599800},   {792712, -29599800},
+               },
+               {
+                   {
+                       {-1455380, -6847030}, {-2847160, -6394820},
+                       {-4114500, -5663120}, {-5202010, -4683910},
+                       {-6062180, -3500000}, {-6657400, -2163120},
+                       {-6961650, -731699},  {-6961650, 731699},
+                       {-6657400, 2163120},  {-6062180, 3500000},
+                       {-5202010, 4683910},  {-4114500, 5663120},
+                       {-2847160, 6394820},  {-1455380, 6847030},
+                       {0, 7000000},         {1455380, 6847030},
+                       {2847160, 6394820},   {4114500, 5663120},
+                       {5202010, 4683910},   {6062180, 3500000},
+                       {6657400, 2163120},   {6961650, 731699},
+                       {6961650, -731699},   {6657400, -2163120},
+                       {6062180, -3500000},  {5641320, -4079259},
+                       {6084032, -4450744},  {6083180, -4451690},
+                       {5472037, -5130444},  {5414502, -5194343},
+                       {5328022, -5121778},  {5011080, -4855830},
+                       {4114500, -5663120},  {2847160, -6394820},
+                       {1455380, -6847030},  {0, -7000000},
+                   },
+                   {
+                       {-700340, -23663300},  {-1393010, -23553600},
+                       {-2070410, -23372100}, {-2725130, -23120800},
+                       {-3350000, -22802400}, {-3938160, -22420400},
+                       {-4483170, -21979100}, {-4979070, -21483200},
+                       {-5420410, -20938200}, {-5802370, -20350000},
+                       {-6120750, -19725100}, {-6372080, -19070400},
+                       {-6500000, -18593000}, {-6500000, -15515603},
+                       {-1406282, -10475000}, {0, -10475000},
+                       {0, -10468600},        {365572, -10468600},
+                       {1094940, -10417600},  {1156540, -10409000},
+                       {1393010, -10446400},  {2070410, -10627900},
+                       {2725130, -10879200},  {3350000, -11197600},
+                       {3938160, -11579600},  {4483170, -12020900},
+                       {4979070, -12516800},  {5420410, -13061800},
+                       {5802370, -13650000},  {6120750, -14274900},
+                       {6372080, -14929600},  {6553590, -15607000},
+                       {6663300, -16299700},  {6700000, -17000000},
+                       {6663300, -17700300},  {6553590, -18393000},
+                       {6372080, -19070400},  {6120750, -19725100},
+                       {5802370, -20350000},  {5420410, -20938200},
+                       {4979070, -21483200},  {4483170, -21979100},
+                       {3938160, -22420400},  {3350000, -22802400},
+                       {2725130, -23120800},  {2070410, -23372100},
+                       {1393010, -23553600},  {700340, -23663300},
+                       {0, -23700000},
+                   },
+                   {
+                       {6459400, -25347200}, {6257180, -25302000},
+                       {6062220, -25231800}, {5877600, -25137700},
+                       {5706220, -25021300}, {5550790, -24884200},
+                       {5413760, -24728800}, {5297290, -24557400},
+                       {5203220, -24372800}, {5133030, -24177800},
+                       {5087830, -23975600}, {5068330, -23769300},
+                       {5074840, -23562200}, {5107250, -23357600},
+                       {5165060, -23158600}, {5247350, -22968400},
+                       {5352830, -22790100}, {5479830, -22626400},
+                       {5626350, -22479800}, {5790080, -22352800},
+                       {5968430, -22247400}, {6158600, -22165100},
+                       {6357580, -22107300}, {6562230, -22074800},
+                       {6769340, -22068300}, {6975630, -22087800},
+                       {7177850, -22133000}, {7372810, -22203200},
+                       {7557430, -22297300}, {7728810, -22413800},
+                       {7884240, -22550800}, {8021270, -22706200},
+                       {8137740, -22877600}, {8231809, -23062200},
+                       {8302000, -23257200}, {8347200, -23459400},
+                       {8366700, -23665700}, {8360190, -23872800},
+                       {8327780, -24077400}, {8269970, -24276400},
+                       {8187670, -24466600}, {8082200, -24645000},
+                       {7955200, -24808700}, {7808680, -24955200},
+                       {7644950, -25082200}, {7466600, -25187700},
+                       {7276430, -25270000}, {7077450, -25327800},
+                       {6872790, -25360200}, {6665690, -25366700},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "y-belt-idler.stl":
+        MyPoly{{
+                   {12500000, 40000000},
+                   {-12500000, 40000000},
+                   {-12500000, 5000000},
+                   {12500000, 5000000},
+               },
+               {
+                   {
+                       {-103604, 34353300},  {-309178, 34379200},
+                       {-509877, 34430800},  {-702536, 34507000},
+                       {-884113, 34606900},  {-1051750, 34728700},
+                       {-1202800, 34870500}, {-1334880, 35030200},
+                       {-1445910, 35205100}, {-1534130, 35392600},
+                       {-1598160, 35589700}, {-1636990, 35793200},
+                       {-1650000, 36000000}, {-1636990, 36206800},
+                       {-1598160, 36410300}, {-1534130, 36607400},
+                       {-1445910, 36794900}, {-1334880, 36969800},
+                       {-1202800, 37129500}, {-1051750, 37271300},
+                       {-884113, 37393100},  {-702536, 37493000},
+                       {-509877, 37569200},  {-309178, 37620800},
+                       {-103604, 37646700},  {103604, 37646700},
+                       {309178, 37620800},   {509877, 37569200},
+                       {702536, 37493000},   {884113, 37393100},
+                       {1051750, 37271300},  {1202800, 37129500},
+                       {1334880, 36969800},  {1445910, 36794900},
+                       {1534130, 36607400},  {1598160, 36410300},
+                       {1636990, 36206800},  {1650000, 36000000},
+                       {1636990, 35793200},  {1598160, 35589700},
+                       {1534130, 35392600},  {1445910, 35205100},
+                       {1334880, 35030200},  {1202800, 34870500},
+                       {1051750, 34728700},  {884113, 34606900},
+                       {702536, 34507000},   {509877, 34430800},
+                       {309178, 34379200},   {103604, 34353300},
+                   },
+                   {
+                       {-103604, 8353260},   {-309178, 8379229},
+                       {-509877, 8430760},   {-702536, 8507040},
+                       {-884113, 8606860},   {-1051750, 8728650},
+                       {-1202800, 8870500},  {-1334880, 9030150},
+                       {-1445910, 9205110},  {-1534130, 9392590},
+                       {-1598160, 9589660},  {-1636990, 9793200},
+                       {-1650000, 10000000}, {-1636990, 10206800},
+                       {-1598160, 10410300}, {-1534130, 10607400},
+                       {-1445910, 10794900}, {-1334880, 10969800},
+                       {-1202800, 11129500}, {-1051750, 11271300},
+                       {-884113, 11393100},  {-702536, 11493000},
+                       {-509877, 11569200},  {-309178, 11620800},
+                       {-103604, 11646700},  {103604, 11646700},
+                       {309178, 11620800},   {509877, 11569200},
+                       {702536, 11493000},   {884113, 11393100},
+                       {1051750, 11271300},  {1202800, 11129500},
+                       {1334880, 10969800},  {1445910, 10794900},
+                       {1534130, 10607400},  {1598160, 10410300},
+                       {1636990, 10206800},  {1650000, 10000000},
+                       {1636990, 9793200},   {1598160, 9589660},
+                       {1534130, 9392590},   {1445910, 9205110},
+                       {1334880, 9030150},   {1202800, 8870500},
+                       {1051750, 8728650},   {884113, 8606860},
+                       {702536, 8507040},    {509877, 8430760},
+                       {309178, 8379229},    {103604, 8353260},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "z-screw-cover.stl":
+        MyPoly{{
+                   {836227, -7956170},   {927804, -7941670},
+                   {964293, -7941670},   {1029899, -7925500},
+                   {1663290, -7825180},  {2472140, -7608450},
+                   {2751896, -7501064},  {2836840, -7480130},
+                   {2919650, -7436670},  {3253890, -7308360},
+                   {4000000, -6928200},  {4470019, -6622970},
+                   {4544520, -6583870},  {4583731, -6549125},
+                   {4702280, -6472140},  {5353040, -5945160},
+                   {5945160, -5353040},  {5973910, -5317540},
+                   {5988090, -5304980},  {6011204, -5271483},
+                   {6472140, -4702280},  {6928200, -4000000},
+                   {7039150, -3782250},  {7083650, -3717780},
+                   {7117560, -3628360},  {7308360, -3253890},
+                   {7608450, -2472140},  {7734580, -2001420},
+                   {7767530, -1914530},  {7775550, -1848520},
+                   {7825180, -1663290},  {7956170, -836227},
+                   {8000000, 0},         {7956170, 836227},
+                   {7825180, 1663290},   {7775550, 1848520},
+                   {7767530, 1914530},   {7734580, 2001420},
+                   {7608450, 2472140},   {7308360, 3253890},
+                   {7117560, 3628360},   {7083650, 3717780},
+                   {7039150, 3782250},   {6928200, 4000000},
+                   {6472140, 4702280},   {6011204, 5271483},
+                   {5988090, 5304980},   {5973910, 5317540},
+                   {5945160, 5353040},   {5353040, 5945160},
+                   {4702280, 6472140},   {4583731, 6549125},
+                   {4544520, 6583870},   {4470019, 6622970},
+                   {4000000, 6928200},   {3253890, 7308360},
+                   {2919650, 7436670},   {2836840, 7480130},
+                   {2751896, 7501064},   {2472140, 7608450},
+                   {1663290, 7825180},   {1029899, 7925500},
+                   {964293, 7941670},    {927804, 7941670},
+                   {836227, 7956170},    {0, 8000000},
+                   {-836227, 7956170},   {-927804, 7941670},
+                   {-964293, 7941670},   {-1029899, 7925500},
+                   {-1663290, 7825180},  {-2472140, 7608450},
+                   {-2751896, 7501064},  {-2836840, 7480130},
+                   {-2919650, 7436670},  {-3253890, 7308360},
+                   {-4000000, 6928200},  {-4470019, 6622970},
+                   {-4544520, 6583870},  {-4583731, 6549125},
+                   {-4702280, 6472140},  {-5353040, 5945160},
+                   {-5945160, 5353040},  {-5973910, 5317540},
+                   {-5988090, 5304980},  {-6011204, 5271483},
+                   {-6472140, 4702280},  {-6928200, 4000000},
+                   {-7039150, 3782250},  {-7083650, 3717780},
+                   {-7117560, 3628360},  {-7308360, 3253890},
+                   {-7608450, 2472140},  {-7734580, 2001420},
+                   {-7767530, 1914530},  {-7775550, 1848520},
+                   {-7825180, 1663290},  {-7956170, 836227},
+                   {-8000000, 0},        {-7956170, -836227},
+                   {-7825180, -1663290}, {-7775550, -1848520},
+                   {-7767530, -1914530}, {-7734580, -2001420},
+                   {-7608450, -2472140}, {-7308360, -3253890},
+                   {-7117560, -3628360}, {-7083650, -3717780},
+                   {-7039150, -3782250}, {-6928200, -4000000},
+                   {-6472140, -4702280}, {-6011204, -5271483},
+                   {-5988090, -5304980}, {-5973910, -5317540},
+                   {-5945160, -5353040}, {-5353040, -5945160},
+                   {-4702280, -6472140}, {-4583731, -6549125},
+                   {-4544520, -6583870}, {-4470019, -6622970},
+                   {-4000000, -6928200}, {-3253890, -7308360},
+                   {-2919650, -7436670}, {-2836840, -7480130},
+                   {-2751896, -7501064}, {-2472140, -7608450},
+                   {-1663290, -7825180}, {-1029899, -7925500},
+                   {-964293, -7941670},  {-927804, -7941670},
+                   {-836227, -7956170},  {0, -8000000},
+               },
+               {
+                   {
+                       {400000, -3200000},   {-400000, -3200000},
+                       {-440000, -3400000},  {-799999, -3400000},
+                       {-875001, -3600000},  {-1300000, -3600000},
+                       {-1416318, -3948965}, {-1708290, -3836890},
+                       {-2100000, -3637310}, {-2468700, -3397870},
+                       {-2810350, -3121210}, {-3121210, -2810350},
+                       {-3397870, -2468700}, {-3637310, -2100000},
+                       {-3836890, -1708290}, {-3994440, -1297870},
+                       {-4108220, -873229},  {-4152979, -590596},
+                       {-3200000, -400000},  {-3200000, 400000},
+                       {-3400000, 440000},   {-3400000, 799999},
+                       {-3600000, 874998},   {-3600000, 1300000},
+                       {-3948965, 1416318},  {-3836890, 1708290},
+                       {-3637310, 2100000},  {-3397870, 2468700},
+                       {-3121210, 2810350},  {-2810350, 3121210},
+                       {-2468700, 3397870},  {-2100000, 3637310},
+                       {-1708290, 3836890},  {-1297870, 3994440},
+                       {-873229, 4108220},   {-590596, 4152979},
+                       {-400000, 3200000},   {400000, 3200000},
+                       {440000, 3400000},    {799999, 3400000},
+                       {874998, 3600000},    {1300000, 3600000},
+                       {1416318, 3948965},   {1708290, 3836890},
+                       {2100000, 3637310},   {2468700, 3397870},
+                       {2810350, 3121210},   {3121210, 2810350},
+                       {3397870, 2468700},   {3637310, 2100000},
+                       {3836890, 1708290},   {3994440, 1297870},
+                       {4108220, 873229},    {4152979, 590596},
+                       {3200000, 400000},    {3200000, -400000},
+                       {3400000, -440000},   {3400000, -799999},
+                       {3600000, -874998},   {3600000, -1300000},
+                       {3948965, -1416318},  {3836890, -1708290},
+                       {3637310, -2100000},  {3397870, -2468700},
+                       {3121210, -2810350},  {2810350, -3121210},
+                       {2468700, -3397870},  {2100000, -3637310},
+                       {1708290, -3836890},  {1297870, -3994440},
+                       {873229, -4108220},   {590596, -4152979},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "cable-holder.stl":
+        MyPoly{{
+                   {-2043150, -34799100}, {-1990180, -34549300},
+                   {-1988820, -34542900}, {-1986150, -34536800},
+                   {-1882530, -34303500}, {-1732900, -34097100},
+                   {-1728930, -34091600}, {-1723900, -34087100},
+                   {-1534730, -33916300}, {-1308420, -33785400},
+                   {-1059890, -33704400}, {-806907, -33677700},
+                   {-799999, -33677000},  {-793091, -33677700},
+                   {-540110, -33704400},  {-291578, -33785400},
+                   {-65267, -33916300},   {123903, -34087100},
+                   {128930, -34091600},   {132903, -34097100},
+                   {282532, -34303500},   {386150, -34536800},
+                   {388820, -34542900},   {390183, -34549300},
+                   {443151, -34799100},   {443151, -34908100},
+                   {556848, -34908100},   {556848, -34799100},
+                   {609816, -34549300},   {611179, -34542900},
+                   {613849, -34536800},   {717467, -34303500},
+                   {867096, -34097100},   {871069, -34091600},
+                   {876096, -34087100},   {1065270, -33916300},
+                   {1291580, -33785400},  {1540110, -33704400},
+                   {1793090, -33677700},  {1800000, -33677000},
+                   {1806910, -33677700},  {2059890, -33704400},
+                   {2308420, -33785400},  {2534730, -33916300},
+                   {2723900, -34087100},  {2728930, -34091600},
+                   {2732900, -34097100},  {2882530, -34303500},
+                   {2986150, -34536800},  {2988820, -34542900},
+                   {2990180, -34549300},  {3043150, -34799100},
+                   {3043150, -34908100},  {4000000, -34908100},
+                   {4000000, -29539900},  {4215720, -29345700},
+                   {4830130, -28500000},  {5255280, -27545100},
+                   {5472610, -26522600},  {5472610, -26000000},
+                   {5500000, -26000000},  {5500000, -17000000},
+                   {4805710, -17000000},  {4215720, -17815100},
+                   {3438930, -18517200},  {2533680, -19041900},
+                   {1539560, -19366100},  {499999, -19475800},
+                   {-539558, -19366100},  {-1533680, -19041900},
+                   {-2438930, -18517200}, {-3215720, -17815100},
+                   {-3805710, -17000000}, {-4500000, -17000000},
+                   {-4500000, -26000000}, {-4472610, -26000000},
+                   {-4472610, -26522600}, {-4255280, -27545100},
+                   {-3830130, -28500000}, {-3215720, -29345700},
+                   {-3000000, -29539900}, {-3000000, -34908100},
+                   {-2043150, -34908100},
+               },
+               {
+                   {
+                       {136154, -28711800},   {-211788, -28598700},
+                       {-382749, -28500000},  {-528624, -28415800},
+                       {-800503, -28171000},  {-1015540, -27875000},
+                       {-1164350, -27540800}, {-1240410, -27182900},
+                       {-1240410, -26817100}, {-1164350, -26459200},
+                       {-1015540, -26125000}, {-800503, -25829000},
+                       {-528624, -25584200},  {-382751, -25500000},
+                       {-211788, -25401300},  {136154, -25288200},
+                       {500000, -25250000},   {863845, -25288200},
+                       {1211790, -25401300},  {1382750, -25500000},
+                       {1528620, -25584200},  {1800500, -25829000},
+                       {2015539, -26125000},  {2164350, -26459200},
+                       {2240410, -26817100},  {2240410, -27182900},
+                       {2164350, -27540800},  {2015539, -27875000},
+                       {1800500, -28171000},  {1528620, -28415800},
+                       {1382750, -28500000},  {1211790, -28598700},
+                       {863845, -28711800},   {499999, -28750000},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "Einsy-doors.stl":
+        MyPoly{{
+                   {105500000, 91975304},
+                   {21500000, 91975304},
+                   {21500000, 87500000},
+                   {0, 87500000},
+                   {0, 0},
+                   {105500000, 0},
+               },
+               {
+                   {
+                       {46000000, 60500000},
+                       {46000000, 79500000},
+                       {49650000, 79500000},
+                       {49650000, 60500000},
+                   },
+                   {
+                       {58000000, 60500000},
+                       {58000000, 79500000},
+                       {61650000, 79500000},
+                       {61650000, 60500000},
+                   },
+                   {
+                       {70000000, 60500000},
+                       {70000000, 79500000},
+                       {73650000, 79500000},
+                       {73650000, 60500000},
+                   },
+                   {
+                       {64000000, 60500000},
+                       {64000000, 79500000},
+                       {67650000, 79500000},
+                       {67650000, 60500000},
+                   },
+                   {
+                       {94000000, 60500000},
+                       {94000000, 79500000},
+                       {97650000, 79500000},
+                       {97650000, 60500000},
+                   },
+                   {
+                       {52000000, 60500000},
+                       {52000000, 79500000},
+                       {55650000, 79500000},
+                       {55650000, 60500000},
+                   },
+                   {
+                       {88000000, 60500000},
+                       {88000000, 79500000},
+                       {91650000, 79500000},
+                       {91650000, 60500000},
+                   },
+                   {
+                       {82000000, 60500000},
+                       {82000000, 79500000},
+                       {85650000, 79500000},
+                       {85650000, 60500000},
+                   },
+                   {
+                       {40000000, 60500000},
+                       {40000000, 79500000},
+                       {43650000, 79500000},
+                       {43650000, 60500000},
+                   },
+                   {
+                       {76000000, 60500000},
+                       {76000000, 79500000},
+                       {79650000, 79500000},
+                       {79650000, 60500000},
+                   },
+                   {
+                       {52000000, 35500000},
+                       {52000000, 54500000},
+                       {55650000, 54500000},
+                       {55650000, 35500000},
+                   },
+                   {
+                       {40000000, 35500000},
+                       {40000000, 54500000},
+                       {43650000, 54500000},
+                       {43650000, 35500000},
+                   },
+                   {
+                       {58000000, 35500000},
+                       {58000000, 54500000},
+                       {61650000, 54500000},
+                       {61650000, 35500000},
+                   },
+                   {
+                       {76000000, 35500000},
+                       {76000000, 54500000},
+                       {79650000, 54500000},
+                       {79650000, 35500000},
+                   },
+                   {
+                       {94000000, 35500000},
+                       {94000000, 54500000},
+                       {97650000, 54500000},
+                       {97650000, 35500000},
+                   },
+                   {
+                       {82000000, 35500000},
+                       {82000000, 54500000},
+                       {85650000, 54500000},
+                       {85650000, 35500000},
+                   },
+                   {
+                       {64000000, 35500000},
+                       {64000000, 54500000},
+                       {67650000, 54500000},
+                       {67650000, 35500000},
+                   },
+                   {
+                       {70000000, 35500000},
+                       {70000000, 54500000},
+                       {73650000, 54500000},
+                       {73650000, 35500000},
+                   },
+                   {
+                       {46000000, 35500000},
+                       {46000000, 54500000},
+                       {49650000, 54500000},
+                       {49650000, 35500000},
+                   },
+                   {
+                       {88000000, 35500000},
+                       {88000000, 54500000},
+                       {91650000, 54500000},
+                       {91650000, 35500000},
+                   },
+                   {
+                       {40000000, 10500000},
+                       {40000000, 29500000},
+                       {43650000, 29500000},
+                       {43650000, 10500000},
+                   },
+                   {
+                       {82000000, 10500000},
+                       {82000000, 29500000},
+                       {85650000, 29500000},
+                       {85650000, 10500000},
+                   },
+                   {
+                       {94000000, 10500000},
+                       {94000000, 29500000},
+                       {97650000, 29500000},
+                       {97650000, 10500000},
+                   },
+                   {
+                       {88000000, 10500000},
+                       {88000000, 29500000},
+                       {91650000, 29500000},
+                       {91650000, 10500000},
+                   },
+                   {
+                       {76000000, 10500000},
+                       {76000000, 29500000},
+                       {79650000, 29500000},
+                       {79650000, 10500000},
+                   },
+                   {
+                       {64000000, 10500000},
+                       {64000000, 29500000},
+                       {67650000, 29500000},
+                       {67650000, 10500000},
+                   },
+                   {
+                       {52000000, 10500000},
+                       {52000000, 29500000},
+                       {55650000, 29500000},
+                       {55650000, 10500000},
+                   },
+                   {
+                       {70000000, 10500000},
+                       {70000000, 29500000},
+                       {73650000, 29500000},
+                       {73650000, 10500000},
+                   },
+                   {
+                       {46000000, 10500000},
+                       {46000000, 29500000},
+                       {49650000, 29500000},
+                       {49650000, 10500000},
+                   },
+                   {
+                       {58000000, 10500000},
+                       {58000000, 29500000},
+                       {61650000, 29500000},
+                       {61650000, 10500000},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "y-motor-holder.stl":
+        MyPoly{{
+                   {47000000, 0},        {47000000, 15000000},
+                   {42000000, 20000000}, {37468500, 20000000},
+                   {37500000, 19500000}, {37409300, 18058700},
+                   {37138700, 16640100}, {36692400, 15266600},
+                   {36077500, 13959800}, {35303700, 12740500},
+                   {34383100, 11627700}, {33330398, 10639100},
+                   {32161998, 9790230},  {30896500, 9094490},
+                   {29553700, 8562850},  {28154900, 8203700},
+                   {26722100, 8022690},  {25277900, 8022690},
+                   {23845100, 8203700},  {22446300, 8562850},
+                   {21103500, 9094490},  {19838000, 9790230},
+                   {18669600, 10639100}, {17616900, 11627700},
+                   {16696301, 12740500}, {15922500, 13959800},
+                   {15307600, 15266600}, {14861300, 16640100},
+                   {14590700, 18058700}, {14500000, 19500000},
+                   {14590700, 20941300}, {14861300, 22359900},
+                   {15000000, 22786800}, {15000000, 38000000},
+                   {12500000, 40500000}, {9642140, 40500000},
+                   {71067, 30928900},    {0, 31000000},
+                   {0, -1500000},        {45500000, -1500000},
+               },
+               {
+                   {
+                       {10396400, 33353298}, {10190800, 33379200},
+                       {9990120, 33430802},  {9797460, 33507000},
+                       {9615890, 33606900},  {9448250, 33728700},
+                       {9297200, 33870500},  {9165120, 34030200},
+                       {9054090, 34205100},  {8965870, 34392600},
+                       {8901840, 34589700},  {8863010, 34793200},
+                       {8850000, 35000000},  {8863010, 35206800},
+                       {8901840, 35410300},  {8965870, 35607400},
+                       {9054090, 35794900},  {9165120, 35969800},
+                       {9297200, 36129500},  {9448250, 36271300},
+                       {9615890, 36393100},  {9797460, 36493000},
+                       {9990120, 36569200},  {10190800, 36620800},
+                       {10396400, 36646700}, {10603600, 36646700},
+                       {10809200, 36620800}, {11009900, 36569200},
+                       {11202500, 36493000}, {11384100, 36393100},
+                       {11551700, 36271300}, {11702800, 36129500},
+                       {11834900, 35969800}, {11945900, 35794900},
+                       {12034100, 35607400}, {12098200, 35410300},
+                       {12137000, 35206800}, {12150000, 35000000},
+                       {12137000, 34793200}, {12098200, 34589700},
+                       {12034100, 34392600}, {11945900, 34205100},
+                       {11834900, 34030200}, {11702800, 33870500},
+                       {11551700, 33728700}, {11384100, 33606900},
+                       {11202500, 33507000}, {11009900, 33430802},
+                       {10809200, 33379200}, {10603600, 33353298},
+                   },
+                   {
+                       {41396400, 2353260}, {41190800, 2379230},
+                       {40990100, 2430760}, {40797500, 2507040},
+                       {40615900, 2606860}, {40448200, 2728650},
+                       {40297200, 2870500}, {40165100, 3030150},
+                       {40054100, 3205110}, {39965900, 3392590},
+                       {39901800, 3589660}, {39863000, 3793200},
+                       {39850000, 4000000}, {39863000, 4206800},
+                       {39901800, 4410340}, {39965900, 4607400},
+                       {40054100, 4794890}, {40165100, 4969840},
+                       {40297200, 5129500}, {40448200, 5271350},
+                       {40615900, 5393140}, {40797500, 5492960},
+                       {40990100, 5569240}, {41190800, 5620770},
+                       {41396400, 5646740}, {41603600, 5646740},
+                       {41809200, 5620770}, {42009900, 5569240},
+                       {42202500, 5492960}, {42384100, 5393140},
+                       {42551800, 5271350}, {42702800, 5129500},
+                       {42834900, 4969840}, {42945900, 4794890},
+                       {43034100, 4607400}, {43098200, 4410340},
+                       {43137000, 4206800}, {43150000, 4000000},
+                       {43137000, 3793200}, {43098200, 3589660},
+                       {43034100, 3392590}, {42945900, 3205110},
+                       {42834900, 3030150}, {42702800, 2870500},
+                       {42551800, 2728650}, {42384100, 2606860},
+                       {42202500, 2507040}, {42009900, 2430760},
+                       {41809200, 2379230}, {41603600, 2353260},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "heatbed-cable-cover.stl":
+        MyPoly{{
+                   {15000000, 48000000},
+                   {11000000, 52000000},
+                   {-11000000, 52000000},
+                   {-15000000, 48000000},
+                   {-15000000, 35500000},
+                   {15000000, 35500000},
+               },
+               {
+                   {
+                       {-10100500, 43403200}, {-10299800, 43428300},
+                       {-10494400, 43478300}, {-10681200, 43552300},
+                       {-10857300, 43649100}, {-11019900, 43767200},
+                       {-11166300, 43904700}, {-11294400, 44059500},
+                       {-11402100, 44229200}, {-11487600, 44411000},
+                       {-11549700, 44602100}, {-11587400, 44799500},
+                       {-11600000, 45000000}, {-11587400, 45200500},
+                       {-11549700, 45397900}, {-11487600, 45589000},
+                       {-11402100, 45770800}, {-11294400, 45940500},
+                       {-11166300, 46095300}, {-11019900, 46232800},
+                       {-10857300, 46350900}, {-10681200, 46447700},
+                       {-10494400, 46521700}, {-10299800, 46571700},
+                       {-10100500, 46596800}, {-9899530, 46596800},
+                       {-9700190, 46571700},  {-9505570, 46521700},
+                       {-9318750, 46447700},  {-9142680, 46350900},
+                       {-8980120, 46232800},  {-8833650, 46095300},
+                       {-8705570, 45940500},  {-8597910, 45770800},
+                       {-8512360, 45589000},  {-8450270, 45397900},
+                       {-8412620, 45200500},  {-8400000, 45000000},
+                       {-8412620, 44799500},  {-8450270, 44602100},
+                       {-8512360, 44411000},  {-8597910, 44229200},
+                       {-8705570, 44059500},  {-8833650, 43904700},
+                       {-8980120, 43767200},  {-9142680, 43649100},
+                       {-9318750, 43552300},  {-9505570, 43478300},
+                       {-9700190, 43428300},  {-9899530, 43403200},
+                   },
+                   {
+                       {9899530, 43403200},  {9700190, 43428300},
+                       {9505570, 43478300},  {9318750, 43552300},
+                       {9142680, 43649100},  {8980120, 43767200},
+                       {8833650, 43904700},  {8705570, 44059500},
+                       {8597910, 44229200},  {8512360, 44411000},
+                       {8450270, 44602100},  {8412620, 44799500},
+                       {8400000, 45000000},  {8412620, 45200500},
+                       {8450270, 45397900},  {8512360, 45589000},
+                       {8597910, 45770800},  {8705570, 45940500},
+                       {8833650, 46095300},  {8980120, 46232800},
+                       {9142680, 46350900},  {9318750, 46447700},
+                       {9505570, 46521700},  {9700190, 46571700},
+                       {9899530, 46596800},  {10100500, 46596800},
+                       {10299800, 46571700}, {10494400, 46521700},
+                       {10681200, 46447700}, {10857300, 46350900},
+                       {11019900, 46232800}, {11166300, 46095300},
+                       {11294400, 45940500}, {11402100, 45770800},
+                       {11487600, 45589000}, {11549700, 45397900},
+                       {11587400, 45200500}, {11600000, 45000000},
+                       {11587400, 44799500}, {11549700, 44602100},
+                       {11487600, 44411000}, {11402100, 44229200},
+                       {11294400, 44059500}, {11166300, 43904700},
+                       {11019900, 43767200}, {10857300, 43649100},
+                       {10681200, 43552300}, {10494400, 43478300},
+                       {10299800, 43428300}, {10100500, 43403200},
+                   },
+               }},
+        MyPoly{{
+                   {18000000, 25000000},
+                   {16426001, 26574000},
+                   {11000000, 32000000},
+                   {-11000000, 32000000},
+                   {-18000000, 25000000},
+                   {-18000000, 0},
+                   {18000000, 0},
+               },
+               {
+                   {
+                       {-10100500, 23403200}, {-10299800, 23428300},
+                       {-10494400, 23478300}, {-10681200, 23552300},
+                       {-10857300, 23649100}, {-11019900, 23767200},
+                       {-11166300, 23904700}, {-11294400, 24059500},
+                       {-11402100, 24229200}, {-11487600, 24411000},
+                       {-11549700, 24602100}, {-11587400, 24799500},
+                       {-11600000, 25000000}, {-11587400, 25200500},
+                       {-11549700, 25397900}, {-11487600, 25589000},
+                       {-11402100, 25770800}, {-11294400, 25940500},
+                       {-11166300, 26095300}, {-11019900, 26232800},
+                       {-10857300, 26350900}, {-10681200, 26447700},
+                       {-10494400, 26521700}, {-10299800, 26571700},
+                       {-10100500, 26596800}, {-9899530, 26596800},
+                       {-9700190, 26571700},  {-9505570, 26521700},
+                       {-9318750, 26447700},  {-9142680, 26350900},
+                       {-8980120, 26232800},  {-8833650, 26095300},
+                       {-8705570, 25940500},  {-8597910, 25770800},
+                       {-8512360, 25589000},  {-8450270, 25397900},
+                       {-8412620, 25200500},  {-8400000, 25000000},
+                       {-8412620, 24799500},  {-8450270, 24602100},
+                       {-8512360, 24411000},  {-8597910, 24229200},
+                       {-8705570, 24059500},  {-8833650, 23904700},
+                       {-8980120, 23767200},  {-9142680, 23649100},
+                       {-9318750, 23552300},  {-9505570, 23478300},
+                       {-9700190, 23428300},  {-9899530, 23403200},
+                   },
+                   {
+                       {9899530, 23403200},  {9700190, 23428300},
+                       {9505570, 23478300},  {9318750, 23552300},
+                       {9142680, 23649100},  {8980120, 23767200},
+                       {8833650, 23904700},  {8705570, 24059500},
+                       {8597910, 24229200},  {8512360, 24411000},
+                       {8450270, 24602100},  {8412620, 24799500},
+                       {8400000, 25000000},  {8412620, 25200500},
+                       {8450270, 25397900},  {8512360, 25589000},
+                       {8597910, 25770800},  {8705570, 25940500},
+                       {8833650, 26095300},  {8980120, 26232800},
+                       {9142680, 26350900},  {9318750, 26447700},
+                       {9505570, 26521700},  {9700190, 26571700},
+                       {9899530, 26596800},  {10100500, 26596800},
+                       {10299800, 26571700}, {10494400, 26521700},
+                       {10681200, 26447700}, {10857300, 26350900},
+                       {11019900, 26232800}, {11166300, 26095300},
+                       {11294400, 25940500}, {11402100, 25770800},
+                       {11487600, 25589000}, {11549700, 25397900},
+                       {11587400, 25200500}, {11600000, 25000000},
+                       {11587400, 24799500}, {11549700, 24602100},
+                       {11487600, 24411000}, {11402100, 24229200},
+                       {11294400, 24059500}, {11166300, 23904700},
+                       {11019900, 23767200}, {10857300, 23649100},
+                       {10681200, 23552300}, {10494400, 23478300},
+                       {10299800, 23428300}, {10100500, 23403200},
+                   },
+                   {
+                       {-100465, 5903160},  {-299809, 5928340},
+                       {-494427, 5978310},  {-681247, 6052280},
+                       {-857323, 6149070},  {-1019880, 6267180},
+                       {-1166350, 6404720}, {-1294430, 6559540},
+                       {-1402090, 6729190}, {-1487640, 6911000},
+                       {-1549730, 7102100}, {-1587380, 7299470},
+                       {-1600000, 7500000}, {-1587380, 7700530},
+                       {-1549730, 7897900}, {-1487640, 8088999},
+                       {-1402090, 8270810}, {-1294430, 8440460},
+                       {-1166350, 8595270}, {-1019880, 8732820},
+                       {-857323, 8850920},  {-681247, 8947720},
+                       {-494427, 9021690},  {-299809, 9071660},
+                       {-100465, 9096840},  {100465, 9096840},
+                       {299809, 9071660},   {494427, 9021690},
+                       {681247, 8947720},   {857323, 8850920},
+                       {1019880, 8732820},  {1166350, 8595270},
+                       {1294430, 8440460},  {1402090, 8270810},
+                       {1487640, 8088999},  {1549730, 7897900},
+                       {1587380, 7700530},  {1600000, 7500000},
+                       {1587380, 7299470},  {1549730, 7102100},
+                       {1487640, 6911000},  {1402090, 6729190},
+                       {1294430, 6559540},  {1166350, 6404720},
+                       {1019880, 6267180},  {857323, 6149070},
+                       {681247, 6052280},   {494427, 5978310},
+                       {299809, 5928340},   {100465, 5903160},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "y-rod-holder.stl":
+        MyPoly{{
+                   {-4130159, -11630200}, {-4125905, -11625938},
+                   {-4036359, -11536400}, {-3977214, -11477197},
+                   {-3893620, -11393600}, {-3968460, -11001300},
+                   {-4000000, -10500000}, {-3968460, -9998670},
+                   {-3874330, -9505240},  {-3719110, -9027500},
+                   {-3505230, -8572980},  {-3236070, -8148860},
+                   {-2915870, -7761810},  {-2549700, -7417950},
+                   {-2143310, -7122690},  {-1920140, -7000000},
+                   {-1703120, -6880690},  {-1236070, -6695770},
+                   {-749525, -6570850},   {-251162, -6507890},
+                   {251162, -6507890},    {749525, -6570850},
+                   {1236070, -6695770},   {1703120, -6880690},
+                   {1920140, -7000000},   {2143310, -7122690},
+                   {2549700, -7417950},   {2915870, -7761810},
+                   {3236070, -8148860},   {3505230, -8572980},
+                   {3719110, -9027500},   {3874330, -9505240},
+                   {3968460, -9998670},   {4000000, -10500000},
+                   {3968460, -11001300},  {3916390, -11274300},
+                   {4089891, -11447789},  {4113299, -11471200},
+                   {4642140, -12000000},  {8618800, -12000000},
+                   {10350900, -9000000},  {11376300, -7223940},
+                   {13000000, -4411540},  {13000000, 0},
+                   {4000000, 0},          {4000000, 1500000},
+                   {-4000000, 1500000},   {-4000000, 0},
+                   {-13000000, 0},        {-13000000, -4202820},
+                   {-8498290, -12000000}, {-4500000, -12000000},
+               },
+               {}},
+    },
+    ExPolygons{
+        // "extruder-body.stl":
+        MyPoly{{
+                   {32000000, -41357900},  {32000000, -34500000},
+                   {27500000, -30000000},  {22600000, -30000000},
+                   {22600000, -29900000},  {22500000, -30000000},
+                   {17000000, -24500000},  {17000000, -12000000},
+                   {23000000, -12000000},  {23000000, -18000000},
+                   {23928900, -18000000},  {26000000, -15928900},
+                   {26000000, -10000000},  {23000000, -7000000},
+                   {17000000, -7000000},   {17000000, 44000000},
+                   {11000000, 50000000},   {-18000000, 50000000},
+                   {-25000000, 43000000},  {-25000000, 5750000},
+                   {-27250000, 5750000},   {-31500000, 1500000},
+                   {-31500000, -1500000},  {-24500000, -1500000},
+                   {-24500000, 2500000},   {-21309400, 2500000},
+                   {-20500000, 1098080},   {-20500000, -44000000},
+                   {-15500000, -44000000}, {-15500000, -38000000},
+                   {-14000000, -36500000}, {14000000, -36500000},
+                   {14000000, -38916000},  {14423151, -39823468},
+                   {14452100, -39885600},  {15259800, -41617700},
+                   {18642100, -45000000},  {28357900, -45000000},
+               },
+               {
+                   {
+                       {-19603600, 40853300}, {-19790500, 40876900},
+                       {-19809200, 40879200}, {-19991600, 40926100},
+                       {-20009900, 40930800}, {-20202500, 41007000},
+                       {-20384100, 41106900}, {-20491899, 41185194},
+                       {-20551700, 41228700}, {-20551800, 41228700},
+                       {-20702800, 41370500}, {-20834900, 41530200},
+                       {-20945900, 41705100}, {-21034100, 41892600},
+                       {-21098200, 42089700}, {-21137000, 42293200},
+                       {-21150000, 42500000}, {-21137000, 42706800},
+                       {-21098200, 42910300}, {-21034100, 43107400},
+                       {-20945900, 43294900}, {-20834900, 43469800},
+                       {-20702800, 43629500}, {-20551800, 43771300},
+                       {-20551700, 43771300}, {-20491899, 43814806},
+                       {-20384100, 43893100}, {-20202500, 43993000},
+                       {-20009900, 44069200}, {-19991600, 44073900},
+                       {-19809200, 44120800}, {-19790500, 44123100},
+                       {-19603600, 44146700}, {-19396400, 44146700},
+                       {-19209500, 44123100}, {-19190800, 44120800},
+                       {-19008400, 44073900}, {-18990100, 44069200},
+                       {-18797500, 43993000}, {-18615900, 43893100},
+                       {-18448200, 43771300}, {-18297200, 43629500},
+                       {-18165100, 43469800}, {-18054100, 43294900},
+                       {-17965900, 43107400}, {-17901800, 42910300},
+                       {-17863000, 42706800}, {-17850000, 42500000},
+                       {-17863000, 42293200}, {-17901800, 42089700},
+                       {-17965900, 41892600}, {-18054100, 41705100},
+                       {-18165100, 41530200}, {-18297200, 41370500},
+                       {-18448200, 41228700}, {-18615900, 41106900},
+                       {-18797500, 41007000}, {-18990100, 40930800},
+                       {-19008400, 40926100}, {-19190800, 40879200},
+                       {-19209500, 40876900}, {-19396400, 40853300},
+                   },
+                   {
+                       {11396400, 40853300}, {11190800, 40879200},
+                       {10990100, 40930800}, {10797500, 41007000},
+                       {10615900, 41106900}, {10448200, 41228700},
+                       {10297200, 41370500}, {10165100, 41530200},
+                       {10054100, 41705100}, {9965870, 41892600},
+                       {9901840, 42089700},  {9863010, 42293200},
+                       {9850000, 42500000},  {9863010, 42706800},
+                       {9901840, 42910300},  {9965870, 43107400},
+                       {10054100, 43294900}, {10165100, 43469800},
+                       {10297200, 43629500}, {10448200, 43771300},
+                       {10615900, 43893100}, {10797500, 43993000},
+                       {10990100, 44069200}, {11190800, 44120800},
+                       {11396400, 44146700}, {11603600, 44146700},
+                       {11809200, 44120800}, {12009900, 44069200},
+                       {12202500, 43993000}, {12384100, 43893100},
+                       {12551700, 43771300}, {12702800, 43629500},
+                       {12834900, 43469800}, {12945900, 43294900},
+                       {13034100, 43107400}, {13098200, 42910300},
+                       {13137000, 42706800}, {13150000, 42500000},
+                       {13137000, 42293200}, {13098200, 42089700},
+                       {13034100, 41892600}, {12945900, 41705100},
+                       {12834900, 41530200}, {12702800, 41370500},
+                       {12551700, 41228700}, {12384100, 41106900},
+                       {12202500, 41007000}, {12009900, 40930800},
+                       {11809200, 40879200}, {11603600, 40853300},
+                   },
+                   {
+                       {-3181780, 21500000},  {-15111782, 22578598},
+                       {-15737800, 24505100}, {-15797300, 25071800},
+                       {-15997500, 26976600}, {-16000000, 27000000},
+                       {-15737800, 29494900}, {-14962500, 31880800},
+                       {-13708200, 34053400}, {-12029600, 35917700},
+                       {-10000000, 37392300}, {-8500000, 38060100},
+                       {-7708200, 38412700},  {-5282850, 38928200},
+                       {-5254340, 38934300},  {-3000000, 38934300},
+                       {-3000000, 33500000},  {-1092350, 31592300},
+                       {-1091812, 31591773},  {-1065440, 31565400},
+                       {-1063162, 31563127},  {-963937, 31463900},
+                       {-889918, 31389900},   {-860013, 31360013},
+                       {-612800, 31112800},   {-589409, 31089400},
+                       {-366049, 30866044},   {-339918, 30839900},
+                       {-206119, 30706100},   {0, 30500000},
+                       {206119, 30706100},    {339918, 30839900},
+                       {362385, 30862377},    {889918, 31389900},
+                       {963937, 31463900},    {1063442, 31563406},
+                       {1065440, 31565400},   {1091822, 31591782},
+                       {1092350, 31592300},   {4000000, 34500000},
+                       {4000000, 35939184},   {4029570, 35917700},
+                       {5708200, 34053400},   {6962550, 31880800},
+                       {7737770, 29494900},   {8000000, 27000000},
+                       {7737770, 24505100},   {6962550, 22119200},
+                       {6605070, 21500000},   {1727920, 21500000},
+                       {1698940, 21529000},   {1530830, 21697100},
+                       {1516490, 21711437},   {1125240, 22102700},
+                       {894136, 22333800},    {648935, 22579000},
+                       {318574, 22909343},    {131860, 23096100},
+                       {0, 23227900},         {-131860, 23096100},
+                       {-318574, 22909343},   {-648935, 22579000},
+                       {-894136, 22333800},   {-1125240, 22102700},
+                       {-1516490, 21711437},  {-1530830, 21697100},
+                       {-1698940, 21529000},  {-1727920, 21500000},
+                   },
+                   {
+                       {-19603600, 9853260},  {-19809200, 9879230},
+                       {-20009900, 9930760},  {-20202500, 10007000},
+                       {-20384100, 10106900}, {-20551800, 10228700},
+                       {-20702800, 10370500}, {-20834900, 10530200},
+                       {-20945900, 10705100}, {-21034100, 10892600},
+                       {-21098200, 11089700}, {-21137000, 11293200},
+                       {-21150000, 11500000}, {-21137000, 11706800},
+                       {-21098200, 11910300}, {-21034100, 12107400},
+                       {-20945900, 12294900}, {-20834900, 12469800},
+                       {-20702800, 12629500}, {-20551800, 12771300},
+                       {-20384100, 12893100}, {-20202500, 12993000},
+                       {-20009900, 13069200}, {-19809200, 13120800},
+                       {-19603600, 13146700}, {-19396400, 13146700},
+                       {-19190800, 13120800}, {-18990100, 13069200},
+                       {-18797500, 12993000}, {-18615900, 12893100},
+                       {-18448200, 12771300}, {-18297200, 12629500},
+                       {-18165100, 12469800}, {-18054100, 12294900},
+                       {-17965900, 12107400}, {-17901800, 11910300},
+                       {-17863000, 11706800}, {-17850000, 11500000},
+                       {-17863000, 11293200}, {-17901800, 11089700},
+                       {-17965900, 10892600}, {-18054100, 10705100},
+                       {-18165100, 10530200}, {-18297200, 10370500},
+                       {-18448200, 10228700}, {-18615900, 10106900},
+                       {-18797500, 10007000}, {-18990100, 9930760},
+                       {-19190800, 9879230},  {-19396400, 9853260},
+                   },
+                   {
+                       {11396400, 9853260},  {11190800, 9879230},
+                       {10990100, 9930760},  {10797500, 10007000},
+                       {10615900, 10106900}, {10448200, 10228700},
+                       {10297200, 10370500}, {10165100, 10530200},
+                       {10054100, 10705100}, {9965870, 10892600},
+                       {9901840, 11089700},  {9863010, 11293200},
+                       {9850000, 11500000},  {9863010, 11706800},
+                       {9901840, 11910300},  {9965870, 12107400},
+                       {10054100, 12294900}, {10165100, 12469800},
+                       {10297200, 12629500}, {10448200, 12771300},
+                       {10615900, 12893100}, {10797500, 12993000},
+                       {10990100, 13069200}, {11190800, 13120800},
+                       {11396400, 13146700}, {11603600, 13146700},
+                       {11809200, 13120800}, {12009900, 13069200},
+                       {12202500, 12993000}, {12384100, 12893100},
+                       {12551700, 12771300}, {12702800, 12629500},
+                       {12834900, 12469800}, {12945900, 12294900},
+                       {13034100, 12107400}, {13098200, 11910300},
+                       {13137000, 11706800}, {13150000, 11500000},
+                       {13137000, 11293200}, {13098200, 11089700},
+                       {13034100, 10892600}, {12945900, 10705100},
+                       {12834900, 10530200}, {12702800, 10370500},
+                       {12551700, 10228700}, {12384100, 10106900},
+                       {12202500, 10007000}, {12009900, 9930760},
+                       {11809200, 9879230},  {11603600, 9853260},
+                   },
+                   {
+                       {-17177700, 1309310}, {-17525300, 1383200},
+                       {-17850000, 1527760}, {-18137500, 1736650},
+                       {-18375300, 2000760}, {-18553000, 2308550},
+                       {-18662800, 2646550}, {-18700000, 3000000},
+                       {-18662800, 3353450}, {-18553000, 3691450},
+                       {-18375300, 3999230}, {-18137500, 4263350},
+                       {-17850000, 4472240}, {-17525300, 4616800},
+                       {-17177700, 4690690}, {-16822300, 4690690},
+                       {-16474701, 4616800}, {-16150000, 4472240},
+                       {-15862500, 4263350}, {-15624700, 3999230},
+                       {-15447000, 3691450}, {-15337100, 3353450},
+                       {-15300000, 3000000}, {-15337100, 2646550},
+                       {-15447000, 2308550}, {-15624700, 2000760},
+                       {-15862500, 1736650}, {-16150000, 1527760},
+                       {-16474701, 1383200}, {-16822300, 1309310},
+                   },
+                   {
+                       {-11603600, -2146740}, {-11809200, -2120770},
+                       {-12009900, -2069240}, {-12202500, -1992960},
+                       {-12384100, -1893140}, {-12551700, -1771350},
+                       {-12702800, -1629500}, {-12834900, -1469840},
+                       {-12945900, -1294890}, {-13034100, -1107400},
+                       {-13098200, -910337},  {-13137000, -706800},
+                       {-13150000, -500000},  {-13137000, -293200},
+                       {-13098200, -89661},   {-13034100, 107405},
+                       {-12945900, 294893},   {-12834900, 469845},
+                       {-12702800, 629502},   {-12551700, 771346},
+                       {-12384100, 893141},   {-12202500, 992964},
+                       {-12009900, 1069240},  {-11809200, 1120770},
+                       {-11603600, 1146740},  {-11396400, 1146740},
+                       {-11190800, 1120770},  {-10990100, 1069240},
+                       {-10797500, 992964},   {-10615900, 893141},
+                       {-10448200, 771346},   {-10297200, 629502},
+                       {-10165100, 469845},   {-10054100, 294893},
+                       {-9965870, 107405},    {-9901840, -89661},
+                       {-9863010, -293200},   {-9850000, -499999},
+                       {-9863010, -706800},   {-9901840, -910337},
+                       {-9965870, -1107400},  {-10054100, -1294890},
+                       {-10165100, -1469840}, {-10297200, -1629500},
+                       {-10448200, -1771350}, {-10615900, -1893140},
+                       {-10797500, -1992960}, {-10990100, -2069240},
+                       {-11190800, -2120770}, {-11396400, -2146740},
+                   },
+                   {
+                       {11396400, -2146740}, {11190800, -2120770},
+                       {10990100, -2069240}, {10797500, -1992960},
+                       {10615900, -1893140}, {10448200, -1771350},
+                       {10297200, -1629500}, {10165100, -1469840},
+                       {10054100, -1294890}, {9965870, -1107400},
+                       {9901840, -910337},   {9863010, -706800},
+                       {9850000, -500000},   {9863010, -293200},
+                       {9901840, -89661},    {9965870, 107405},
+                       {10054100, 294893},   {10165100, 469845},
+                       {10297200, 629502},   {10448200, 771346},
+                       {10615900, 893141},   {10797500, 992964},
+                       {10990100, 1069240},  {11190800, 1120770},
+                       {11396400, 1146740},  {11603600, 1146740},
+                       {11809200, 1120770},  {12009900, 1069240},
+                       {12202500, 992964},   {12384100, 893141},
+                       {12551700, 771346},   {12702800, 629502},
+                       {12834900, 469845},   {12945900, 294893},
+                       {13034100, 107405},   {13098200, -89661},
+                       {13137000, -293200},  {13150000, -499999},
+                       {13137000, -706800},  {13098200, -910337},
+                       {13034100, -1107400}, {12945900, -1294890},
+                       {12834900, -1469840}, {12702800, -1629500},
+                       {12551700, -1771350}, {12384100, -1893140},
+                       {12202500, -1992960}, {12009900, -2069240},
+                       {11809200, -2120770}, {11603600, -2146740},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "z-axis-top.stl":
+        MyPoly{{
+                   {34521100, -3478930},
+                   {38000000, 0},
+                   {38000000, 23000000},
+                   {33000000, 28000000},
+                   {24000000, 28000000},
+                   {20000000, 21071800},
+                   {12000000, 21071800},
+                   {8000000, 28000000},
+                   {8000000, 34200000},
+                   {2200000, 40000000},
+                   {0, 40000000},
+                   {0, 1000000},
+                   {6000000, -5000000},
+                   {33000000, -5000000},
+               },
+               {
+                   {
+                       {12000000, 3071800},
+                       {8000000, 10000000},
+                       {12000000, 16928200},
+                       {20000000, 16928200},
+                       {24000000, 10000000},
+                       {20000000, 3071800},
+                   },
+               }},
+        MyPoly{{
+                   {8000000, -46200000},
+                   {8000000, -40000000},
+                   {12000000, -33071800},
+                   {20000000, -33071800},
+                   {24000000, -40000000},
+                   {33000000, -40000000},
+                   {38000000, -35000000},
+                   {38000000, -12000000},
+                   {34521100, -8521070},
+                   {33000000, -7000000},
+                   {6000000, -7000000},
+                   {0, -13000000},
+                   {0, -52000000},
+                   {2200000, -52000000},
+               },
+               {
+                   {
+                       {12000000, -28928200},
+                       {8000000, -22000000},
+                       {12000000, -15071800},
+                       {20000000, -15071800},
+                       {24000000, -22000000},
+                       {20000000, -28928200},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "y-belt-holder.stl":
+        MyPoly{{
+                   {12500000, 24000000},
+                   {5142140, 24000000},
+                   {4500000, 23357900},
+                   {4500000, 15000000},
+                   {-9057860, 15000000},
+                   {-11000000, 13057900},
+                   {-11000000, -13057900},
+                   {-9057860, -15000000},
+                   {4500000, -15000000},
+                   {4500000, -23357900},
+                   {5142140, -24000000},
+                   {12500000, -24000000},
+               },
+               {}},
+    },
+    ExPolygons{
+        // "LCD-knob.stl":
+        MyPoly{{
+                   {1045280, -9945220},  {2079119, -9781480},
+                   {3090170, -9510560},  {4067370, -9135450},
+                   {5000000, -8660250},  {5877850, -8090170},
+                   {6691310, -7431450},  {7431450, -6691310},
+                   {8090170, -5877850},  {8660250, -5000000},
+                   {9135450, -4067370},  {9510560, -3090170},
+                   {9781480, -2079119},  {9945220, -1045280},
+                   {10000000, 0},        {9945220, 1045280},
+                   {9781480, 2079119},   {9510560, 3090170},
+                   {9135450, 4067370},   {8660250, 5000000},
+                   {8090170, 5877850},   {7431450, 6691310},
+                   {6691310, 7431450},   {5877850, 8090170},
+                   {5000000, 8660250},   {4067370, 9135450},
+                   {3090170, 9510560},   {2100000, 9775880},
+                   {2100000, 18221800},  {-2100000, 18221800},
+                   {-2100000, 9775880},  {-3090170, 9510560},
+                   {-4067370, 9135450},  {-5000000, 8660250},
+                   {-5877850, 8090170},  {-6691310, 7431450},
+                   {-7431450, 6691310},  {-8090170, 5877850},
+                   {-8660250, 5000000},  {-9135450, 4067370},
+                   {-9510560, 3090170},  {-9781480, 2079119},
+                   {-9945220, 1045280},  {-10000000, 0},
+                   {-9945220, -1045280}, {-9781480, -2079119},
+                   {-9510560, -3090170}, {-9135450, -4067370},
+                   {-8660250, -5000000}, {-8090170, -5877850},
+                   {-7431450, -6691310}, {-6691310, -7431450},
+                   {-5877850, -8090170}, {-5000000, -8660250},
+                   {-4067370, -9135450}, {-3090170, -9510560},
+                   {-2079119, -9781480}, {-1045280, -9945220},
+                   {0, -10000000},
+               },
+               {}},
+    },
+    ExPolygons{
+        // "rpi-zero-frame.stl":
+        MyPoly{{
+                   {58000000, -25983600}, {58313600, -25983600},
+                   {58927100, -25853200}, {59500000, -25598100},
+                   {60007400, -25229400}, {60427100, -24763400},
+                   {60740600, -24220200}, {60934400, -23623700},
+                   {61000000, -23000000}, {61000000, 0},
+                   {60934400, 623734},    {60740600, 1220210},
+                   {60427100, 1763360},   {60007400, 2229430},
+                   {59500000, 2598080},   {58927100, 2853170},
+                   {58313600, 2983570},   {58000000, 2983570},
+                   {58000000, 3000000},   {55000000, 3000000},
+                   {55000000, 6000000},   {45000000, 6000000},
+                   {45000000, 3000000},   {0, 3000000},
+                   {0, 2983570},          {-313585, 2983570},
+                   {-927051, 2853170},    {-1500000, 2598080},
+                   {-2007390, 2229430},   {-2427050, 1763360},
+                   {-2740640, 1220210},   {-2934440, 623734},
+                   {-3000000, 0},         {-3000000, -23000000},
+                   {-2934440, -23623700}, {-2740640, -24220200},
+                   {-2427050, -24763400}, {-2007390, -25229400},
+                   {-1500000, -25598100}, {-927051, -25853200},
+                   {-313585, -25983600},  {313585, -25983600},
+                   {927051, -25853200},   {1000000, -25820720},
+                   {1000000, -26000000},  {58000000, -26000000},
+               },
+               {
+                   {
+                       {44883600, -2063829},
+                       {44638500, -2012070},
+                       {44409000, -1909530},
+                       {44205900, -1762070},
+                       {44037900, -1575550},
+                       {43912900, -1358750},
+                       {43834800, -1120470},
+                       {43822600, -1000000},
+                       {46195173, -1000000},
+                       {46182500, -1120470},
+                       {46105300, -1358750},
+                       {45979300, -1575550},
+                       {45812300, -1762070},
+                       {45609200, -1909530},
+                       {45379700, -2012070},
+                       {45134600, -2063829},
+                   },
+                   {
+                       {51045700, -1970080},
+                       {50800600, -1918320},
+                       {50571100, -1815780},
+                       {50368000, -1668320},
+                       {50200000, -1481800},
+                       {50075000, -1265000},
+                       {49996900, -1025740},
+                       {49994200, -1000000},
+                       {52347300, -1000000},
+                       {52344600, -1025740},
+                       {52267400, -1265000},
+                       {52141400, -1481800},
+                       {51973500, -1668320},
+                       {51771300, -1815780},
+                       {51541800, -1918320},
+                       {51296700, -1970080},
+                   },
+                   {
+                       {3000000, -20000000},
+                       {3000000, -3000000},
+                       {43887500, -3000000},
+                       {43912900, -2922230},
+                       {44037900, -2705430},
+                       {44205900, -2518910},
+                       {44409000, -2371440},
+                       {44638500, -2268910},
+                       {44883600, -2217150},
+                       {45134600, -2217150},
+                       {45379700, -2268910},
+                       {45609200, -2371440},
+                       {45812300, -2518910},
+                       {45979300, -2705430},
+                       {46105300, -2922230},
+                       {46130400, -3000000},
+                       {55000000, -3000000},
+                       {55000000, -20000000},
+                   },
+                   {
+                       {22525500, -22729500}, {22321000, -22686100},
+                       {22130000, -22601000}, {21960900, -22478100},
+                       {21821000, -22322800}, {21716500, -22141700},
+                       {21651900, -21942900}, {21630000, -21735000},
+                       {21651900, -21527100}, {21716500, -21328300},
+                       {21821000, -21147200}, {21960900, -20991900},
+                       {22130000, -20869000}, {22321000, -20783900},
+                       {22525500, -20740500}, {22734500, -20740500},
+                       {22939000, -20783900}, {23130000, -20869000},
+                       {23299100, -20991900}, {23439000, -21147200},
+                       {23543500, -21328300}, {23608100, -21527100},
+                       {23630000, -21735000}, {23608100, -21942900},
+                       {23543500, -22141700}, {23439000, -22322800},
+                       {23299100, -22478100}, {23130000, -22601000},
+                       {22939000, -22686100}, {22734500, -22729500},
+                   },
+                   {
+                       {7285470, -25269500}, {7080980, -25226100},
+                       {6890000, -25141000}, {6720870, -25018100},
+                       {6580980, -24862800}, {6476450, -24681700},
+                       {6411850, -24482900}, {6390000, -24275000},
+                       {6411850, -24067100}, {6476450, -23868300},
+                       {6580980, -23687200}, {6720870, -23531900},
+                       {6890000, -23409000}, {7080980, -23323900},
+                       {7285470, -23280500}, {7494530, -23280500},
+                       {7699020, -23323900}, {7890000, -23409000},
+                       {8059129, -23531900}, {8199020, -23687200},
+                       {8303540, -23868300}, {8368150, -24067100},
+                       {8390000, -24275000}, {8368150, -24482900},
+                       {8303540, -24681700}, {8199020, -24862800},
+                       {8059129, -25018100}, {7890000, -25141000},
+                       {7699020, -25226100}, {7494530, -25269500},
+                   },
+                   {
+                       {22525500, -25269500}, {22321000, -25226100},
+                       {22130000, -25141000}, {21960900, -25018100},
+                       {21821000, -24862800}, {21716500, -24681700},
+                       {21651900, -24482900}, {21630000, -24275000},
+                       {21651900, -24067100}, {21716500, -23868300},
+                       {21821000, -23687200}, {21960900, -23531900},
+                       {22130000, -23409000}, {22321000, -23323900},
+                       {22525500, -23280500}, {22734500, -23280500},
+                       {22939000, -23323900}, {23130000, -23409000},
+                       {23299100, -23531900}, {23439000, -23687200},
+                       {23543500, -23868300}, {23608100, -24067100},
+                       {23630000, -24275000}, {23608100, -24482900},
+                       {23543500, -24681700}, {23439000, -24862800},
+                       {23299100, -25018100}, {23130000, -25141000},
+                       {22939000, -25226100}, {22734500, -25269500},
+                   },
+                   {
+                       {14905500, -25269500}, {14701000, -25226100},
+                       {14510000, -25141000}, {14340900, -25018100},
+                       {14201000, -24862800}, {14096500, -24681700},
+                       {14031900, -24482900}, {14010000, -24275000},
+                       {14031900, -24067100}, {14096500, -23868300},
+                       {14201000, -23687200}, {14340900, -23531900},
+                       {14510000, -23409000}, {14701000, -23323900},
+                       {14905500, -23280500}, {15114500, -23280500},
+                       {15319000, -23323900}, {15510000, -23409000},
+                       {15679100, -23531900}, {15819000, -23687200},
+                       {15923500, -23868300}, {15988100, -24067100},
+                       {16010000, -24275000}, {15988100, -24482900},
+                       {15923500, -24681700}, {15819000, -24862800},
+                       {15679100, -25018100}, {15510000, -25141000},
+                       {15319000, -25226100}, {15114500, -25269500},
+                   },
+                   {
+                       {12365500, -25269500}, {12161000, -25226100},
+                       {11970000, -25141000}, {11800900, -25018100},
+                       {11661000, -24862800}, {11556500, -24681700},
+                       {11491900, -24482900}, {11470000, -24275000},
+                       {11491900, -24067100}, {11556500, -23868300},
+                       {11661000, -23687200}, {11800900, -23531900},
+                       {11970000, -23409000}, {12161000, -23323900},
+                       {12365500, -23280500}, {12574500, -23280500},
+                       {12779000, -23323900}, {12970000, -23409000},
+                       {13139100, -23531900}, {13279000, -23687200},
+                       {13383500, -23868300}, {13448100, -24067100},
+                       {13470000, -24275000}, {13448100, -24482900},
+                       {13383500, -24681700}, {13279000, -24862800},
+                       {13139100, -25018100}, {12970000, -25141000},
+                       {12779000, -25226100}, {12574500, -25269500},
+                   },
+                   {
+                       {9825470, -25269500},  {9620980, -25226100},
+                       {9430000, -25141000},  {9260870, -25018100},
+                       {9120980, -24862800},  {9016450, -24681700},
+                       {8951850, -24482900},  {8930000, -24275000},
+                       {8951850, -24067100},  {9016450, -23868300},
+                       {9120980, -23687200},  {9260870, -23531900},
+                       {9430000, -23409000},  {9620980, -23323900},
+                       {9825470, -23280500},  {10034500, -23280500},
+                       {10239000, -23323900}, {10430000, -23409000},
+                       {10599100, -23531900}, {10739000, -23687200},
+                       {10843500, -23868300}, {10908100, -24067100},
+                       {10930000, -24275000}, {10908100, -24482900},
+                       {10843500, -24681700}, {10739000, -24862800},
+                       {10599100, -25018100}, {10430000, -25141000},
+                       {10239000, -25226100}, {10034500, -25269500},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "extruder-idler.stl":
+        MyPoly{{
+                   {31500000, 47000000}, {21500000, 47000000},
+                   {21500000, 43000000}, {21483600, 43000000},
+                   {21483600, 42686400}, {21443900, 42500000},
+                   {21391492, 42253213}, {21356700, 42089700},
+                   {21353200, 42072900}, {21302200, 41958400},
+                   {21234000, 41805300}, {21184936, 41695077},
+                   {21111500, 41530200}, {21098100, 41500000},
+                   {21058200, 41445200}, {20966500, 41319000},
+                   {20900900, 41228700}, {20812400, 41106900},
+                   {20729400, 40992600}, {20660700, 40930800},
+                   {20566175, 40845649}, {20359300, 40659400},
+                   {20263400, 40572900}, {19720200, 40259400},
+                   {19123700, 40065600}, {18688436, 40019806},
+                   {18500000, 40000000}, {18409800, 40009500},
+                   {17876300, 40065600}, {17279800, 40259400},
+                   {16736601, 40572900}, {16640699, 40659400},
+                   {16435924, 40843758}, {16339300, 40930800},
+                   {16270599, 40992600}, {16187599, 41106900},
+                   {16099100, 41228700}, {15996000, 41370500},
+                   {16270599, 40992600}, {15901900, 41500000},
+                   {15888500, 41530200}, {15810600, 41705100},
+                   {15755314, 41829246}, {15735700, 41873300},
+                   {15646800, 42072900}, {15643300, 42089700},
+                   {15608508, 42253213}, {15556100, 42500000},
+                   {15516400, 42686400}, {15516400, 43000000},
+                   {15500000, 43000000}, {15500000, 47000000},
+                   {6500000, 47000000},  {6500000, 39000000},
+                   {3500000, 39000000},  {3500000, 22000000},
+                   {6500000, 22000000},  {6500000, 13000000},
+                   {31500000, 13000000},
+               },
+               {
+                   {
+                       {12923500, 25400000},
+                       {12144000, 25850000},
+                       {12144000, 32150002},
+                       {12923500, 32599998},
+                       {17600000, 35300000},
+                       {18379400, 34850000},
+                       {23056000, 32150002},
+                       {23056000, 32000000},
+                       {22750000, 32000000},
+                       {22750000, 30992100},
+                       {21750000, 29994100},
+                       {21750000, 25096023},
+                       {17600000, 22700000},
+                   },
+                   {
+                       {26393300, 16803400}, {26181400, 16830100},
+                       {25974700, 16883200}, {25776200, 16961800},
+                       {25589100, 17064600}, {25416400, 17190100},
+                       {25260800, 17336300}, {25124700, 17500800},
+                       {25010300, 17681000}, {24919400, 17874200},
+                       {24853400, 18077200}, {24813400, 18286900},
+                       {24800000, 18500000}, {24813400, 18713100},
+                       {24853400, 18922800}, {24919400, 19125800},
+                       {25010300, 19319000}, {25124700, 19499200},
+                       {25260800, 19663700}, {25416400, 19809900},
+                       {25589100, 19935400}, {25776200, 20038200},
+                       {25974700, 20116800}, {26181400, 20169900},
+                       {26393300, 20196600}, {26606700, 20196600},
+                       {26818500, 20169900}, {27025300, 20116800},
+                       {27223800, 20038200}, {27410900, 19935400},
+                       {27583600, 19809900}, {27739200, 19663700},
+                       {27875300, 19499200}, {27989700, 19319000},
+                       {28080600, 19125800}, {28146600, 18922800},
+                       {28186600, 18713100}, {28200000, 18500000},
+                       {28186600, 18286900}, {28146600, 18077200},
+                       {28080600, 17874200}, {27989700, 17681000},
+                       {27875300, 17500800}, {27739200, 17336300},
+                       {27583600, 17190100}, {27410900, 17064600},
+                       {27223800, 16961800}, {27025300, 16883200},
+                       {26818500, 16830100}, {26606700, 16803400},
+                   },
+                   {
+                       {11393300, 16803400}, {11181500, 16830100},
+                       {10974700, 16883200}, {10776200, 16961800},
+                       {10589100, 17064600}, {10416400, 17190100},
+                       {10260800, 17336300}, {10124700, 17500800},
+                       {10010300, 17681000}, {9919380, 17874200},
+                       {9853410, 18077200},  {9813400, 18286900},
+                       {9800000, 18500000},  {9813400, 18713100},
+                       {9853410, 18922800},  {9919380, 19125800},
+                       {10010300, 19319000}, {10124700, 19499200},
+                       {10260800, 19663700}, {10416400, 19809900},
+                       {10589100, 19935400}, {10776200, 20038200},
+                       {10974700, 20116800}, {11181500, 20169900},
+                       {11393300, 20196600}, {11606700, 20196600},
+                       {11818500, 20169900}, {12025300, 20116800},
+                       {12223800, 20038200}, {12410900, 19935400},
+                       {12583600, 19809900}, {12739200, 19663700},
+                       {12875300, 19499200}, {12989700, 19319000},
+                       {13080600, 19125800}, {13146600, 18922800},
+                       {13186600, 18713100}, {13200000, 18500000},
+                       {13186600, 18286900}, {13146600, 18077200},
+                       {13080600, 17874200}, {12989700, 17681000},
+                       {12875300, 17500800}, {12739200, 17336300},
+                       {12583600, 17190100}, {12410900, 17064600},
+                       {12223800, 16961800}, {12025300, 16883200},
+                       {11818500, 16830100}, {11606700, 16803400},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "filament-sensor-cover.stl":
+        MyPoly{{
+                   {18000000, 30500000},
+                   {-6000000, 30500000},
+                   {-6000000, -5500000},
+                   {18000000, -5500000},
+               },
+               {
+                   {
+                       {-1167240, 22908800}, {-1494430, 22978300},
+                       {-1800000, 23114400}, {-2070610, 23311000},
+                       {-2294430, 23559500}, {-2461670, 23849200},
+                       {-2565040, 24167300}, {-2582520, 24333700},
+                       {-2600000, 24500000}, {-2582520, 24666300},
+                       {-2565040, 24832700}, {-2461670, 25150800},
+                       {-2294430, 25440500}, {-2070610, 25689000},
+                       {-1800000, 25885600}, {-1494430, 26021700},
+                       {-1167240, 26091200}, {-832754, 26091200},
+                       {-505572, 26021700},  {-200000, 25885600},
+                       {70608, 25689000},    {294427, 25440500},
+                       {461672, 25150800},   {565036, 24832700},
+                       {582518, 24666300},   {599999, 24500000},
+                       {582518, 24333700},   {565036, 24167300},
+                       {461672, 23849200},   {294427, 23559500},
+                       {70608, 23311000},    {-200000, 23114400},
+                       {-505572, 22978300},  {-832754, 22908800},
+                   },
+                   {
+                       {-144249, 15627600},  {-426443, 15687500},
+                       {-689999, 15804900},  {-740738, 15841700},
+                       {-923400, 15974500},  {-965366, 16021099},
+                       {-1116440, 16188900}, {-1229330, 16384399},
+                       {-1260690, 16438700}, {-1280070, 16498400},
+                       {-1349840, 16713100}, {-1373440, 16937600},
+                       {-1380000, 17000000}, {-1373440, 17062400},
+                       {-1349840, 17286900}, {-1280070, 17501600},
+                       {-1260690, 17561300}, {-1229330, 17615600},
+                       {-1116440, 17811100}, {-965366, 17978900},
+                       {-923400, 18025500},  {-872661, 18062400},
+                       {-689999, 18195100},  {-483738, 18286900},
+                       {-426443, 18312500},  {-144249, 18372400},
+                       {144249, 18372400},   {426443, 18312500},
+                       {483738, 18286900},   {689999, 18195100},
+                       {872661, 18062400},   {923400, 18025500},
+                       {965366, 17978900},   {1116440, 17811100},
+                       {1229330, 17615600},  {1260690, 17561300},
+                       {1280070, 17501600},  {1349840, 17286900},
+                       {1373440, 17062400},  {1380000, 17000000},
+                       {1373440, 16937600},  {1349840, 16713100},
+                       {1280070, 16498400},  {1260690, 16438700},
+                       {1229330, 16384399},  {1116440, 16188900},
+                       {965366, 16021099},   {923400, 15974500},
+                       {872661, 15937600},   {689999, 15804900},
+                       {483738, 15713100},   {426443, 15687500},
+                       {144249, 15627600},
+                   },
+                   {
+                       {11832800, 10408800}, {11505600, 10478300},
+                       {11200000, 10614400}, {10929400, 10811000},
+                       {10705600, 11059500}, {10538300, 11349200},
+                       {10435000, 11667300}, {10400000, 12000000},
+                       {10435000, 12332700}, {10538300, 12650800},
+                       {10705600, 12940500}, {10929400, 13189000},
+                       {11200000, 13385600}, {11505600, 13521700},
+                       {11832800, 13591200}, {12167200, 13591200},
+                       {12494400, 13521700}, {12800000, 13385600},
+                       {13070600, 13189000}, {13294400, 12940500},
+                       {13461700, 12650800}, {13565000, 12332700},
+                       {13585100, 12141400}, {13600000, 12000000},
+                       {13582500, 11833700}, {13565000, 11667300},
+                       {13461700, 11349200}, {13294400, 11059500},
+                       {13070600, 10811000}, {12800000, 10614400},
+                       {12494400, 10478300}, {12167200, 10408800},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "nozzle-fan.stl":
+        MyPoly{{
+                   {-14922022, 12367866}, {-14205200, 14337200},
+                   {-13800000, 15450500}, {-13800000, 17000000},
+                   {-13789800, 17000000}, {-13704300, 17813300},
+                   {-13694100, 17910800}, {-12789600, 20694300},
+                   {-11326200, 23229000}, {-9367830, 25404000},
+                   {-7000000, 27124400},  {-5253290, 27902000},
+                   {-4326240, 28314800},  {-1463400, 28923300},
+                   {1463400, 28923300},   {4326240, 28314800},
+                   {5253290, 27902000},   {7000000, 27124400},
+                   {9367830, 25404000},   {11326200, 23229000},
+                   {12789600, 20694300},  {13694100, 17910800},
+                   {13704300, 17813300},  {13789800, 17000000},
+                   {13800000, 17000000},  {13800000, 15606900},
+                   {14240100, 14397700},  {15015200, 12268200},
+                   {15476800, 11000000},  {17800000, 11000000},
+                   {17800000, 11032900},  {18427200, 11032900},
+                   {19654100, 11293700},  {20800000, 11803800},
+                   {21814800, 12541100},  {22654100, 13473300},
+                   {23281300, 14559600},  {23668900, 15752500},
+                   {23706600, 16111099},  {23800000, 17000000},
+                   {23789800, 17000000},  {23475500, 19989900},
+                   {21925100, 24761700},  {19416400, 29106800},
+                   {18612200, 30000000},  {18000000, 30679900},
+                   {18000000, 35500000},  {18500000, 35500000},
+                   {18500000, 40500000},  {17839500, 40500000},
+                   {11200000, 52000000},  {9532010, 52000000},
+                   {9532010, 52800000},   {5416000, 52800000},
+                   {5416000, 52000000},   {4793090, 52000000},
+                   {4793090, 52800000},   {-65918, 52800000},
+                   {-65918, 52000000},    {-296738, 52000000},
+                   {-296738, 52800000},   {-4368740, 52800000},
+                   {-4368740, 52000000},  {-4995880, 52000000},
+                   {-4995880, 52800000},  {-5997880, 52800000},
+                   {-5997880, 52000000},  {-6891430, 52000000},
+                   {-6891430, 52800000},  {-10271400, 52800000},
+                   {-10271400, 52000000}, {-11139700, 52000000},
+                   {-18000000, 40117700}, {-18000000, 30679900},
+                   {-18612200, 30000000}, {-19416400, 29106800},
+                   {-21925100, 24761700}, {-23475500, 19989900},
+                   {-23789800, 17000000}, {-23800000, 17000000},
+                   {-23668900, 15752500}, {-23281300, 14559600},
+                   {-22654100, 13473300}, {-21814800, 12541100},
+                   {-20800000, 11803800}, {-19654100, 11293700},
+                   {-18427200, 11032900}, {-17800000, 11032900},
+                   {-17800000, 11000000}, {-15419900, 11000000},
+               },
+               {}},
+    },
+    ExPolygons{
+        // "x-carriage-back.stl":
+        MyPoly{{
+                   {-5981270, -38729200},  {-5354100, -37638700},
+                   {-4514780, -36703000},  {-3500000, -35962900},
+                   {-2354100, -35450800},  {-1969730, -35368800},
+                   {-1127170, -35189000},  {127170, -35189000},
+                   {969727, -35368800},    {1354100, -35450800},
+                   {2500000, -35962900},   {3514780, -36703000},
+                   {4354100, -37638700},   {4981270, -38729200},
+                   {5068930, -39000000},   {13757900, -39000000},
+                   {16000000, -36757900},  {16000000, -5000000},
+                   {25500000, -5000000},   {25500000, 13795200},
+                   {25057400, 14352100},   {24542500, 15342500},
+                   {24400000, 15200000},   {14600000, 25000000},
+                   {14500000, 25000000},   {14500000, 33050000},
+                   {13050000, 34500000},   {-500000, 34500000},
+                   {-500000, 28500000},    {-8000000, 28500000},
+                   {-8000000, 32500000},   {-5000000, 32500000},
+                   {-5000000, 34500000},   {-15550000, 34500000},
+                   {-17000000, 33050000},  {-17000000, 25000000},
+                   {-17100000, 25000000},  {-25572200, 16527800},
+                   {-25903900, 15532800},  {-26500000, 14386100},
+                   {-26500000, -5000000},  {-17000000, -5000000},
+                   {-17000000, -36757900}, {-14757900, -39000000},
+                   {-6068930, -39000000},
+               },
+               {
+                   {
+                       {-13103600, 29353300}, {-13309200, 29379200},
+                       {-13509900, 29430800}, {-13702500, 29507000},
+                       {-13884100, 29606900}, {-14051700, 29728700},
+                       {-14202800, 29870500}, {-14334900, 30030200},
+                       {-14445900, 30205100}, {-14534100, 30392600},
+                       {-14598200, 30589700}, {-14637000, 30793200},
+                       {-14650000, 31000000}, {-14637000, 31206800},
+                       {-14598200, 31410300}, {-14534100, 31607400},
+                       {-14445900, 31794900}, {-14334900, 31969800},
+                       {-14202800, 32129502}, {-14051700, 32271302},
+                       {-13884100, 32393100}, {-13702500, 32493000},
+                       {-13509900, 32569198}, {-13309200, 32620800},
+                       {-13103600, 32646702}, {-12896400, 32646702},
+                       {-12690800, 32620800}, {-12490100, 32569198},
+                       {-12297500, 32493000}, {-12115900, 32393100},
+                       {-11948200, 32271302}, {-11797200, 32129502},
+                       {-11665100, 31969800}, {-11554100, 31794900},
+                       {-11465900, 31607400}, {-11401800, 31410300},
+                       {-11363000, 31206800}, {-11350000, 31000000},
+                       {-11363000, 30793200}, {-11401800, 30589700},
+                       {-11465900, 30392600}, {-11554100, 30205100},
+                       {-11665100, 30030200}, {-11797200, 29870500},
+                       {-11948200, 29728700}, {-12115900, 29606900},
+                       {-12297500, 29507000}, {-12490100, 29430800},
+                       {-12690800, 29379200}, {-12896400, 29353300},
+                   },
+                   {
+                       {10396400, 29353300}, {10190800, 29379200},
+                       {9990120, 29430800},  {9797460, 29507000},
+                       {9615890, 29606900},  {9448250, 29728700},
+                       {9297200, 29870500},  {9165120, 30030200},
+                       {9054090, 30205100},  {8965870, 30392600},
+                       {8901840, 30589700},  {8863010, 30793200},
+                       {8850000, 31000000},  {8863010, 31206800},
+                       {8901840, 31410300},  {8965870, 31607400},
+                       {9054090, 31794900},  {9165120, 31969800},
+                       {9297200, 32129502},  {9448250, 32271302},
+                       {9615890, 32393100},  {9797460, 32493000},
+                       {9990120, 32569198},  {10190800, 32620800},
+                       {10396400, 32646702}, {10603600, 32646702},
+                       {10809200, 32620800}, {11009900, 32569198},
+                       {11202500, 32493000}, {11384100, 32393100},
+                       {11551700, 32271302}, {11702800, 32129502},
+                       {11834900, 31969800}, {11945900, 31794900},
+                       {12034100, 31607400}, {12098200, 31410300},
+                       {12137000, 31206800}, {12150000, 31000000},
+                       {12137000, 30793200}, {12098200, 30589700},
+                       {12034100, 30392600}, {11945900, 30205100},
+                       {11834900, 30030200}, {11702800, 29870500},
+                       {11551700, 29728700}, {11384100, 29606900},
+                       {11202500, 29507000}, {11009900, 29430800},
+                       {10809200, 29379200}, {10603600, 29353300},
+                   },
+                   {
+                       {-8000000, 17500000},
+                       {-8000000, 22500000},
+                       {-4500000, 22500000},
+                       {-4500000, 17500000},
+                   },
+                   {
+                       {-1103600, 2353260}, {-1309180, 2379230},
+                       {-1509880, 2430760}, {-1702540, 2507040},
+                       {-1884110, 2606860}, {-2051750, 2728650},
+                       {-2202800, 2870500}, {-2334880, 3030150},
+                       {-2445910, 3205110}, {-2534130, 3392590},
+                       {-2598160, 3589660}, {-2636990, 3793200},
+                       {-2650000, 4000000}, {-2636990, 4206800},
+                       {-2598160, 4410340}, {-2534130, 4607400},
+                       {-2445910, 4794890}, {-2334880, 4969840},
+                       {-2202800, 5129500}, {-2051750, 5271350},
+                       {-1884110, 5393140}, {-1702540, 5492960},
+                       {-1509880, 5569240}, {-1309180, 5620770},
+                       {-1103600, 5646740}, {-896395, 5646740},
+                       {-690821, 5620770},  {-490122, 5569240},
+                       {-297463, 5492960},  {-115886, 5393140},
+                       {51749, 5271350},    {202798, 5129500},
+                       {334878, 4969840},   {445906, 4794890},
+                       {534131, 4607400},   {598162, 4410340},
+                       {636989, 4206800},   {650000, 4000000},
+                       {636989, 3793200},   {598162, 3589660},
+                       {534131, 3392590},   {445906, 3205110},
+                       {334878, 3030150},   {202798, 2870500},
+                       {51749, 2728650},    {-115886, 2606860},
+                       {-297463, 2507040},  {-490122, 2430760},
+                       {-690821, 2379230},  {-896395, 2353260},
+                   },
+                   {
+                       {10876300, -3434440}, {10279800, -3240640},
+                       {9736640, -2927050},  {9270570, -2507390},
+                       {8901920, -2000000},  {8646830, -1427050},
+                       {8516430, -813585},   {8516430, -186414},
+                       {8646830, 427051},    {8901920, 999999},
+                       {9270570, 1507390},   {9736640, 1927050},
+                       {10279800, 2240640},  {10876300, 2434440},
+                       {11500000, 2500000},  {12123700, 2434440},
+                       {12720200, 2240640},  {13263400, 1927050},
+                       {13729400, 1507390},  {14098100, 1000000},
+                       {14353200, 427051},   {14483600, -186414},
+                       {14483600, -813585},  {14353200, -1427050},
+                       {14098100, -2000000}, {13729400, -2507390},
+                       {13263400, -2927050}, {12720200, -3240640},
+                       {12123700, -3434440}, {11500000, -3500000},
+                   },
+                   {
+                       {-12123700, -3434440}, {-12720200, -3240640},
+                       {-13263400, -2927050}, {-13729400, -2507390},
+                       {-14098100, -2000000}, {-14353200, -1427050},
+                       {-14483600, -813585},  {-14483600, -186414},
+                       {-14353200, 427051},   {-14098100, 999999},
+                       {-13729400, 1507390},  {-13263400, 1927050},
+                       {-12720200, 2240640},  {-12123700, 2434440},
+                       {-11500000, 2500000},  {-10876300, 2434440},
+                       {-10279800, 2240640},  {-9736640, 1927050},
+                       {-9270570, 1507390},   {-8901920, 1000000},
+                       {-8646830, 427051},    {-8516430, -186414},
+                       {-8516430, -813585},   {-8646830, -1427050},
+                       {-8901920, -2000000},  {-9270570, -2507390},
+                       {-9736640, -2927050},  {-10279800, -3240640},
+                       {-10876300, -3434440}, {-11500000, -3500000},
+                   },
+                   {
+                       {-1539560, -22890700}, {-2533680, -22567700},
+                       {-3438930, -22045100}, {-3590280, -21908800},
+                       {-4215720, -21345700}, {-4806270, -20532800},
+                       {-4830130, -20500000}, {-5012570, -20090200},
+                       {-5255280, -19545100}, {-5472610, -18522600},
+                       {-5472610, -18000000}, {-5500000, -18000000},
+                       {-5500000, -14000000}, {-5472610, -14000000},
+                       {-5472610, -13477400}, {-5255280, -12454900},
+                       {-5052740, -12000000}, {-4830130, -11500000},
+                       {-4215720, -10654300}, {-3438930, -9954910},
+                       {-3189080, -9810670},  {-2533680, -9432270},
+                       {-1539560, -9109260},  {-500000, -9000000},
+                       {539558, -9109260},    {1309400, -9359400},
+                       {1533680, -9432270},   {2438930, -9954910},
+                       {3215720, -10654300},  {3830130, -11500000},
+                       {4052740, -12000000},  {4255280, -12454900},
+                       {4472610, -13477400},  {4472610, -14000000},
+                       {4500000, -14000000},  {4500000, -18000000},
+                       {4472610, -18000000},  {4472610, -18522600},
+                       {4255280, -19545100},  {4012570, -20090200},
+                       {3830130, -20500000},  {3806270, -20532800},
+                       {3215720, -21345700},  {2590280, -21908800},
+                       {2438930, -22045100},  {1533680, -22567700},
+                       {539558, -22890700},   {-499999, -23000000},
+                   },
+                   {
+                       {-832658, -28565000},  {-1150780, -28461700},
+                       {-1440460, -28294400}, {-1689030, -28070600},
+                       {-1885640, -27800000}, {-2021689, -27494400},
+                       {-2091229, -27167200}, {-2091229, -26832800},
+                       {-2021689, -26505600}, {-1885640, -26200000},
+                       {-1689030, -25929400}, {-1440460, -25705600},
+                       {-1150780, -25538300}, {-832658, -25435000},
+                       {-500000, -25400000},  {-167341, -25435000},
+                       {150778, -25538300},   {440456, -25705600},
+                       {689032, -25929400},   {885640, -26200000},
+                       {1021690, -26505600},  {1091230, -26832800},
+                       {1091230, -27167200},  {1021690, -27494400},
+                       {885640, -27800000},   {689032, -28070600},
+                       {440456, -28294400},   {150778, -28461700},
+                       {-167341, -28565000},  {-499999, -28600000},
+                   },
+                   {
+                       {9396390, -37646700},  {9190820, -37620800},
+                       {8990120, -37569200},  {8797460, -37493000},
+                       {8615890, -37393100},  {8448250, -37271300},
+                       {8297200, -37129500},  {8165120, -36969800},
+                       {8054089, -36794900},  {7965870, -36607400},
+                       {7901840, -36410300},  {7863010, -36206800},
+                       {7850000, -36000000},  {7863010, -35793200},
+                       {7901840, -35589700},  {7965870, -35392600},
+                       {8054089, -35205100},  {8165120, -35030200},
+                       {8297200, -34870500},  {8448250, -34728700},
+                       {8615890, -34606900},  {8797460, -34507000},
+                       {8990120, -34430800},  {9190820, -34379200},
+                       {9396390, -34353300},  {9603600, -34353300},
+                       {9809180, -34379200},  {10009900, -34430800},
+                       {10202500, -34507000}, {10384100, -34606900},
+                       {10551700, -34728700}, {10702800, -34870500},
+                       {10834900, -35030200}, {10945900, -35205100},
+                       {11034100, -35392600}, {11098200, -35589700},
+                       {11137000, -35793200}, {11150000, -36000000},
+                       {11137000, -36206800}, {11098200, -36410300},
+                       {11034100, -36607400}, {10945900, -36794900},
+                       {10834900, -36969800}, {10702800, -37129500},
+                       {10551700, -37271300}, {10384100, -37393100},
+                       {10202500, -37493000}, {10009900, -37569200},
+                       {9809180, -37620800},  {9603600, -37646700},
+                   },
+                   {
+                       {-10603600, -37646700}, {-10809200, -37620800},
+                       {-11009900, -37569200}, {-11202500, -37493000},
+                       {-11384100, -37393100}, {-11551700, -37271300},
+                       {-11702800, -37129500}, {-11834900, -36969800},
+                       {-11945900, -36794900}, {-12034100, -36607400},
+                       {-12098200, -36410300}, {-12137000, -36206800},
+                       {-12150000, -36000000}, {-12137000, -35793200},
+                       {-12098200, -35589700}, {-12034100, -35392600},
+                       {-11945900, -35205100}, {-11834900, -35030200},
+                       {-11702800, -34870500}, {-11551700, -34728700},
+                       {-11384100, -34606900}, {-11202500, -34507000},
+                       {-11009900, -34430800}, {-10809200, -34379200},
+                       {-10603600, -34353300}, {-10396400, -34353300},
+                       {-10190800, -34379200}, {-9990120, -34430800},
+                       {-9797460, -34507000},  {-9615890, -34606900},
+                       {-9448250, -34728700},  {-9297200, -34870500},
+                       {-9165120, -35030200},  {-9054090, -35205100},
+                       {-8965870, -35392600},  {-8901840, -35589700},
+                       {-8863010, -35793200},  {-8850000, -36000000},
+                       {-8863010, -36206800},  {-8901840, -36410300},
+                       {-8965870, -36607400},  {-9054090, -36794900},
+                       {-9165120, -36969800},  {-9297200, -37129500},
+                       {-9448250, -37271300},  {-9615890, -37393100},
+                       {-9797460, -37493000},  {-9990120, -37569200},
+                       {-10190800, -37620800}, {-10396400, -37646700},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "extruder-idler-plug.stl":
+        MyPoly{{
+                   {-13000000, 42500000}, {-12967200, 42811900},
+                   {-12906100, 43000000}, {-12870300, 43110100},
+                   {-12713500, 43381700}, {-12503700, 43614700},
+                   {-12250000, 43799000}, {-11963500, 43926600},
+                   {-11656800, 43991800}, {-11343200, 43991800},
+                   {-11036500, 43926600}, {-10750000, 43799000},
+                   {-10496300, 43614700}, {-10286500, 43381700},
+                   {-10129700, 43110100}, {-10093900, 43000000},
+                   {-10032800, 42811900}, {-10000000, 42500000},
+                   {-10000000, 40200000}, {-7000000, 40200000},
+                   {-7000000, 46000000},  {-6400000, 46000000},
+                   {-6400000, 50500000},  {-11937800, 50500000},
+                   {-17000000, 47577400}, {-17000000, 40200000},
+                   {-13000000, 40200000},
+               },
+               {}},
+    },
+    ExPolygons{
+        // "z-axis-bottom.stl":
+        MyPoly{{
+                   {45101600, -4898420},
+                   {50000000, 0},
+                   {50000000, 40786800},
+                   {43286800, 47500000},
+                   {3500000, 47500000},
+                   {0, 44000000},
+                   {0, -2000000},
+                   {3000000, -5000000},
+                   {45000000, -5000000},
+               },
+               {
+                   {
+                       {13696400, 33853300}, {13509500, 33876900},
+                       {13490800, 33879200}, {13308400, 33926100},
+                       {13290100, 33930800}, {13097500, 34007000},
+                       {12915900, 34106900}, {12748300, 34228700},
+                       {12597200, 34370500}, {12465100, 34530200},
+                       {12354100, 34705100}, {12265900, 34892600},
+                       {12201800, 35089700}, {12163000, 35293200},
+                       {12150000, 35500000}, {12163000, 35706800},
+                       {12201800, 35910300}, {12265900, 36107400},
+                       {12354100, 36294900}, {12465100, 36469800},
+                       {12597200, 36629500}, {12748300, 36771300},
+                       {12915900, 36893100}, {13097500, 36993000},
+                       {13290100, 37069200}, {13308400, 37073900},
+                       {13490800, 37120800}, {13509500, 37123100},
+                       {13696400, 37146700}, {13903600, 37146700},
+                       {14090500, 37123100}, {14109200, 37120800},
+                       {14291600, 37073900}, {14309900, 37069200},
+                       {14502500, 36993000}, {14684100, 36893100},
+                       {14791899, 36814806}, {14851700, 36771300},
+                       {14851800, 36771300}, {15002800, 36629500},
+                       {15134900, 36469800}, {15245900, 36294900},
+                       {15334100, 36107400}, {15398200, 35910300},
+                       {15437000, 35706800}, {15450000, 35500000},
+                       {15437000, 35293200}, {15398200, 35089700},
+                       {15334100, 34892600}, {15245900, 34705100},
+                       {15134900, 34530200}, {15002800, 34370500},
+                       {14851800, 34228700}, {14851700, 34228700},
+                       {14791899, 34185194}, {14684100, 34106900},
+                       {14502500, 34007000}, {14309900, 33930800},
+                       {14291600, 33926100}, {14109200, 33879200},
+                       {14090500, 33876900}, {13903600, 33853300},
+                   },
+                   {
+                       {44696400, 33853300}, {44509500, 33876900},
+                       {44490800, 33879200}, {44308400, 33926100},
+                       {44290100, 33930800}, {44097500, 34007000},
+                       {43915900, 34106900}, {43748200, 34228700},
+                       {43597200, 34370500}, {43465100, 34530200},
+                       {43354100, 34705100}, {43265900, 34892600},
+                       {43201800, 35089700}, {43163000, 35293200},
+                       {43150000, 35500000}, {43163000, 35706800},
+                       {43201800, 35910300}, {43265900, 36107400},
+                       {43354100, 36294900}, {43465100, 36469800},
+                       {43597200, 36629500}, {43748200, 36771300},
+                       {43915900, 36893100}, {44097500, 36993000},
+                       {44290100, 37069200}, {44308400, 37073900},
+                       {44490800, 37120800}, {44509500, 37123100},
+                       {44696400, 37146700}, {44903600, 37146700},
+                       {45090500, 37123100}, {45109200, 37120800},
+                       {45291600, 37073900}, {45309900, 37069200},
+                       {45502500, 36993000}, {45684100, 36893100},
+                       {45851700, 36771300}, {46002800, 36629500},
+                       {46134900, 36469800}, {46245900, 36294900},
+                       {46334100, 36107400}, {46398200, 35910300},
+                       {46437000, 35706800}, {46450000, 35500000},
+                       {46437000, 35293200}, {46398200, 35089700},
+                       {46334100, 34892600}, {46245900, 34705100},
+                       {46134900, 34530200}, {46002800, 34370500},
+                       {45851700, 34228700}, {45684100, 34106900},
+                       {45502500, 34007000}, {45309900, 33930800},
+                       {45291600, 33926100}, {45109200, 33879200},
+                       {45090500, 33876900}, {44903600, 33853300},
+                   },
+                   {
+                       {28300000, 8702230},  {28300000, 8861350},
+                       {28129300, 8861350},  {25839000, 9348170},
+                       {23700000, 10300500}, {21805700, 11676800},
+                       {20239000, 13416800}, {19068300, 15444600},
+                       {18344700, 17671400}, {18100000, 20000000},
+                       {18344700, 22328600}, {19068300, 24555500},
+                       {20239000, 26583200}, {21805700, 28323200},
+                       {23700000, 29699500}, {25839000, 30651800},
+                       {28129300, 31138600}, {30470700, 31138600},
+                       {32761002, 30651800}, {34900000, 29699500},
+                       {36794300, 28323200}, {38361000, 26583200},
+                       {39531700, 24555500}, {40255300, 22328600},
+                       {40500000, 20000000}, {40255300, 17671400},
+                       {39531700, 15444600}, {38361000, 13416800},
+                       {36794300, 11676800}, {34900000, 10300500},
+                       {32761002, 9348170},  {30470700, 8861350},
+                       {30300000, 8861350},  {30300000, 8702230},
+                   },
+                   {
+                       {29045700, -1042009}, {28541100, -978263},
+                       {28048500, -851778},  {27575600, -664549},
+                       {27129900, -419528},  {26718400, -120578},
+                       {26347700, 227584},   {26023500, 619470},
+                       {25751000, 1048900},  {25534400, 1509100},
+                       {25377200, 1992810},  {25281900, 2492400},
+                       {25250000, 3000000},  {25281900, 3507600},
+                       {25377200, 4007190},  {25534400, 4490900},
+                       {25751000, 4951100},  {26023500, 5380530},
+                       {26347700, 5772420},  {26718400, 6120580},
+                       {27129900, 6419530},  {27575600, 6664550},
+                       {28048500, 6851780},  {28300000, 6916360},
+                       {28300000, 7213590},  {28487100, 7261610},
+                       {28717100, 7290670},  {29027600, 7329900},
+                       {29572400, 7329900},  {29882900, 7290670},
+                       {30112900, 7261610},  {30300000, 7213590},
+                       {30300000, 6916360},  {30551500, 6851780},
+                       {31024400, 6664550},  {31470100, 6419530},
+                       {31881600, 6120580},  {32252300, 5772420},
+                       {32576500, 5380530},  {32849000, 4951100},
+                       {33065602, 4490900},  {33222802, 4007190},
+                       {33318100, 3507600},  {33349998, 3000000},
+                       {33318100, 2492400},  {33222802, 1992810},
+                       {33065602, 1509100},  {32849000, 1048900},
+                       {32576500, 619470},   {32252300, 227584},
+                       {31881600, -120578},  {31470100, -419528},
+                       {31024400, -664549},  {30551500, -851778},
+                       {30058900, -978263},  {29554300, -1042009},
+                   },
+                   {
+                       {44696400, 2853260}, {44509500, 2876870},
+                       {44490800, 2879230}, {44308400, 2926070},
+                       {44290100, 2930760}, {44097500, 3007040},
+                       {43915900, 3106860}, {43748200, 3228650},
+                       {43597200, 3370500}, {43465100, 3530160},
+                       {43354100, 3705110}, {43265900, 3892600},
+                       {43201800, 4089660}, {43163000, 4293200},
+                       {43150000, 4500000}, {43163000, 4706800},
+                       {43201800, 4910340}, {43265900, 5107410},
+                       {43354100, 5294890}, {43465100, 5469850},
+                       {43597200, 5629500}, {43748200, 5771350},
+                       {43915900, 5893140}, {44097500, 5992960},
+                       {44290100, 6069240}, {44308400, 6073930},
+                       {44490800, 6120770}, {44696400, 6146740},
+                       {44903600, 6146740}, {45109200, 6120770},
+                       {45291600, 6073930}, {45309900, 6069240},
+                       {45502500, 5992960}, {45684100, 5893140},
+                       {45851700, 5771350}, {46002800, 5629500},
+                       {46134900, 5469850}, {46245900, 5294890},
+                       {46334100, 5107410}, {46398200, 4910340},
+                       {46437000, 4706800}, {46450000, 4500000},
+                       {46437000, 4293200}, {46398200, 4089660},
+                       {46334100, 3892600}, {46245900, 3705110},
+                       {46134900, 3530160}, {46002800, 3370500},
+                       {45851700, 3228650}, {45684100, 3106860},
+                       {45502500, 3007040}, {45309900, 2930760},
+                       {45291600, 2926070}, {45109200, 2879230},
+                       {45090500, 2876870}, {44903600, 2853260},
+                   },
+                   {
+                       {13696400, 2853260}, {13509500, 2876870},
+                       {13490800, 2879230}, {13308400, 2926070},
+                       {13290100, 2930760}, {13097500, 3007040},
+                       {12915900, 3106860}, {12748300, 3228650},
+                       {12597200, 3370500}, {12465100, 3530160},
+                       {12354100, 3705110}, {12265900, 3892600},
+                       {12201800, 4089660}, {12163000, 4293200},
+                       {12150000, 4500000}, {12163000, 4706800},
+                       {12201800, 4910340}, {12265900, 5107410},
+                       {12354100, 5294890}, {12465100, 5469850},
+                       {12597200, 5629500}, {12748300, 5771350},
+                       {12915900, 5893140}, {13097500, 5992960},
+                       {13290100, 6069240}, {13308400, 6073930},
+                       {13490800, 6120770}, {13696400, 6146740},
+                       {13903600, 6146740}, {14109200, 6120770},
+                       {14291600, 6073930}, {14309900, 6069240},
+                       {14502500, 5992960}, {14684100, 5893140},
+                       {14754724, 5841850}, {14851700, 5771350},
+                       {14851800, 5771350}, {15002800, 5629500},
+                       {15134900, 5469850}, {15245900, 5294890},
+                       {15334100, 5107410}, {15398200, 4910340},
+                       {15437000, 4706800}, {15450000, 4500000},
+                       {15437000, 4293200}, {15398200, 4089660},
+                       {15334100, 3892600}, {15245900, 3705110},
+                       {15134900, 3530160}, {15002800, 3370500},
+                       {14851800, 3228650}, {14851700, 3228650},
+                       {14754724, 3158150}, {14684100, 3106860},
+                       {14502500, 3007040}, {14309900, 2930760},
+                       {14291600, 2926070}, {14109200, 2879230},
+                       {14090500, 2876870}, {13903600, 2853260},
+                   },
+               }},
+        MyPoly{{
+                   {50000000, -53786800},
+                   {50000000, -13000000},
+                   {45101600, -8101579},
+                   {45000000, -8000000},
+                   {3000000, -8000000},
+                   {0, -11000000},
+                   {0, -57000000},
+                   {3500000, -60500000},
+                   {43286800, -60500000},
+               },
+               {
+                   {
+                       {29027600, -20329900}, {28717100, -20290700},
+                       {28487100, -20261600}, {28300000, -20213600},
+                       {28300000, -19916400}, {28048500, -19851800},
+                       {27575600, -19664500}, {27129900, -19419500},
+                       {26718400, -19120600}, {26347700, -18772400},
+                       {26023500, -18380500}, {25751000, -17951100},
+                       {25534400, -17490900}, {25377200, -17007200},
+                       {25281900, -16507601}, {25250000, -16000000},
+                       {25281900, -15492400}, {25377200, -14992800},
+                       {25534400, -14509100}, {25751000, -14048900},
+                       {26023500, -13619500}, {26347700, -13227600},
+                       {26718400, -12879400}, {27129900, -12580500},
+                       {27575600, -12335500}, {28048500, -12148200},
+                       {28541100, -12021700}, {29045700, -11958000},
+                       {29554300, -11958000}, {30058900, -12021700},
+                       {30551500, -12148200}, {31024400, -12335500},
+                       {31470100, -12580500}, {31881600, -12879400},
+                       {32252300, -13227600}, {32576500, -13619500},
+                       {32849000, -14048900}, {33065602, -14509100},
+                       {33222802, -14992800}, {33318100, -15492400},
+                       {33349998, -16000000}, {33318100, -16507601},
+                       {33222802, -17007200}, {33065602, -17490900},
+                       {32849000, -17951100}, {32576500, -18380500},
+                       {32252300, -18772400}, {31881600, -19120600},
+                       {31470100, -19419500}, {31024400, -19664500},
+                       {30551500, -19851800}, {30300000, -19916400},
+                       {30300000, -20213600}, {30112900, -20261600},
+                       {29882900, -20290700}, {29572400, -20329900},
+                   },
+                   {
+                       {13696400, -19146700}, {13509500, -19123100},
+                       {13490800, -19120800}, {13308400, -19073900},
+                       {13290100, -19069200}, {13097500, -18993000},
+                       {12915900, -18893100}, {12748300, -18771300},
+                       {12597200, -18629500}, {12465100, -18469800},
+                       {12354100, -18294900}, {12265900, -18107400},
+                       {12201800, -17910300}, {12163000, -17706800},
+                       {12150000, -17500000}, {12163000, -17293200},
+                       {12201800, -17089700}, {12265900, -16892600},
+                       {12354100, -16705099}, {12465100, -16530199},
+                       {12597200, -16370501}, {12748300, -16228701},
+                       {12915900, -16106899}, {13097500, -16007000},
+                       {13290100, -15930800}, {13308400, -15926100},
+                       {13490800, -15879200}, {13509500, -15876900},
+                       {13696400, -15853300}, {13903600, -15853300},
+                       {14090500, -15876900}, {14109200, -15879200},
+                       {14291600, -15926100}, {14309900, -15930800},
+                       {14502500, -16007000}, {14684100, -16106899},
+                       {14791305, -16184763}, {14851700, -16228701},
+                       {14851800, -16228701}, {15002800, -16370501},
+                       {15134900, -16530199}, {15245900, -16705099},
+                       {15334100, -16892600}, {15398200, -17089700},
+                       {15437000, -17293200}, {15450000, -17500000},
+                       {15437000, -17706800}, {15398200, -17910300},
+                       {15334100, -18107400}, {15245900, -18294900},
+                       {15134900, -18469800}, {15002800, -18629500},
+                       {14851800, -18771300}, {14851700, -18771300},
+                       {14791899, -18814806}, {14684100, -18893100},
+                       {14502500, -18993000}, {14309900, -19069200},
+                       {14291600, -19073900}, {14109200, -19120800},
+                       {14090500, -19123100}, {13903600, -19146700},
+                   },
+                   {
+                       {44696400, -19146700}, {44509500, -19123100},
+                       {44490800, -19120800}, {44308400, -19073900},
+                       {44290100, -19069200}, {44097500, -18993000},
+                       {43915900, -18893100}, {43748200, -18771300},
+                       {43597200, -18629500}, {43465100, -18469800},
+                       {43354100, -18294900}, {43265900, -18107400},
+                       {43201800, -17910300}, {43163000, -17706800},
+                       {43150000, -17500000}, {43163000, -17293200},
+                       {43201800, -17089700}, {43265900, -16892600},
+                       {43354100, -16705099}, {43465100, -16530199},
+                       {43597200, -16370501}, {43748200, -16228701},
+                       {43915900, -16106899}, {44097500, -16007000},
+                       {44290100, -15930800}, {44308400, -15926100},
+                       {44490800, -15879200}, {44509500, -15876900},
+                       {44696400, -15853300}, {44903600, -15853300},
+                       {45090500, -15876900}, {45109200, -15879200},
+                       {45291600, -15926100}, {45309900, -15930800},
+                       {45502500, -16007000}, {45684100, -16106899},
+                       {45851700, -16228701}, {46002800, -16370501},
+                       {46134900, -16530199}, {46245900, -16705099},
+                       {46334100, -16892600}, {46398200, -17089700},
+                       {46437000, -17293200}, {46450000, -17500000},
+                       {46437000, -17706800}, {46398200, -17910300},
+                       {46334100, -18107400}, {46245900, -18294900},
+                       {46134900, -18469800}, {46002800, -18629500},
+                       {45851700, -18771300}, {45684100, -18893100},
+                       {45502500, -18993000}, {45309900, -19069200},
+                       {45291600, -19073900}, {45109200, -19120800},
+                       {45090500, -19123100}, {44903600, -19146700},
+                   },
+                   {
+                       {28129300, -44138600}, {25839000, -43651800},
+                       {23700000, -42699500}, {21805700, -41323200},
+                       {20239000, -39583200}, {19068300, -37555500},
+                       {18344700, -35328600}, {18100000, -33000000},
+                       {18344700, -30671400}, {19068300, -28444500},
+                       {20239000, -26416800}, {21805700, -24676800},
+                       {23700000, -23300500}, {25839000, -22348200},
+                       {28129300, -21861400}, {28300000, -21861400},
+                       {28300000, -21702200}, {30300000, -21702200},
+                       {30300000, -21861400}, {30470700, -21861400},
+                       {32761002, -22348200}, {34900000, -23300500},
+                       {36794300, -24676800}, {38361000, -26416800},
+                       {39531700, -28444500}, {40255300, -30671400},
+                       {40500000, -33000000}, {40255300, -35328600},
+                       {39531700, -37555500}, {38361000, -39583200},
+                       {36794300, -41323200}, {34900000, -42699500},
+                       {32761002, -43651800}, {30470700, -44138600},
+                   },
+                   {
+                       {44696400, -50146700}, {44509500, -50123100},
+                       {44490800, -50120800}, {44308400, -50073900},
+                       {44290100, -50069200}, {44097500, -49993000},
+                       {43915900, -49893100}, {43748200, -49771300},
+                       {43597200, -49629500}, {43465100, -49469800},
+                       {43354100, -49294900}, {43265900, -49107400},
+                       {43201800, -48910300}, {43163000, -48706800},
+                       {43150000, -48500000}, {43163000, -48293200},
+                       {43201800, -48089700}, {43265900, -47892600},
+                       {43354100, -47705100}, {43465100, -47530200},
+                       {43597200, -47370500}, {43748200, -47228700},
+                       {43915900, -47106900}, {44097500, -47007000},
+                       {44290100, -46930800}, {44308400, -46926100},
+                       {44490800, -46879200}, {44509500, -46876900},
+                       {44696400, -46853300}, {44903600, -46853300},
+                       {45090500, -46876900}, {45109200, -46879200},
+                       {45291600, -46926100}, {45309900, -46930800},
+                       {45502500, -47007000}, {45684100, -47106900},
+                       {45851700, -47228700}, {46002800, -47370500},
+                       {46134900, -47530200}, {46245900, -47705100},
+                       {46334100, -47892600}, {46398200, -48089700},
+                       {46437000, -48293200}, {46450000, -48500000},
+                       {46437000, -48706800}, {46398200, -48910300},
+                       {46334100, -49107400}, {46245900, -49294900},
+                       {46134900, -49469800}, {46002800, -49629500},
+                       {45851700, -49771300}, {45684100, -49893100},
+                       {45502500, -49993000}, {45309900, -50069200},
+                       {45291600, -50073900}, {45109200, -50120800},
+                       {45090500, -50123100}, {44903600, -50146700},
+                   },
+                   {
+                       {13696400, -50146700}, {13509500, -50123100},
+                       {13490800, -50120800}, {13308400, -50073900},
+                       {13290100, -50069200}, {13097500, -49993000},
+                       {12915900, -49893100}, {12748300, -49771300},
+                       {12597200, -49629500}, {12465100, -49469800},
+                       {12354100, -49294900}, {12265900, -49107400},
+                       {12201800, -48910300}, {12163000, -48706800},
+                       {12150000, -48500000}, {12163000, -48293200},
+                       {12201800, -48089700}, {12265900, -47892600},
+                       {12354100, -47705100}, {12465100, -47530200},
+                       {12597200, -47370500}, {12748300, -47228700},
+                       {12915900, -47106900}, {13097500, -47007000},
+                       {13290100, -46930800}, {13308400, -46926100},
+                       {13490800, -46879200}, {13509500, -46876900},
+                       {13696400, -46853300}, {13903600, -46853300},
+                       {14090500, -46876900}, {14109200, -46879200},
+                       {14291600, -46926100}, {14309900, -46930800},
+                       {14502500, -47007000}, {14684100, -47106900},
+                       {14791899, -47185194}, {14851700, -47228700},
+                       {14851800, -47228700}, {15002800, -47370500},
+                       {15134900, -47530200}, {15245900, -47705100},
+                       {15334100, -47892600}, {15398200, -48089700},
+                       {15437000, -48293200}, {15450000, -48500000},
+                       {15437000, -48706800}, {15398200, -48910300},
+                       {15334100, -49107400}, {15245900, -49294900},
+                       {15134900, -49469800}, {15002800, -49629500},
+                       {14851800, -49771300}, {14851700, -49771300},
+                       {14791899, -49814806}, {14684100, -49893100},
+                       {14502500, -49993000}, {14309900, -50069200},
+                       {14291600, -50073900}, {14109200, -50120800},
+                       {14090500, -50123100}, {13903600, -50146700},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "extruder-cover.stl":
+        MyPoly{{
+                   {20500000, 366025},     {21732100, 2500000},
+                   {24500000, 2500000},    {24500000, -1500000},
+                   {31500000, -1500000},   {31500000, 1500000},
+                   {27250000, 5750000},    {-17000000, 5750000},
+                   {-17000000, -26799100}, {-35109600, -33390400},
+                   {-40700000, -33390400}, {-43650000, -38500000},
+                   {-40700000, -43609600}, {-34800000, -43609600},
+                   {-33470820, -41307370}, {-17000000, -35312500},
+                   {-17000000, -36500000}, {-15000000, -36500000},
+                   {-15000000, -44000000}, {20500000, -44000000},
+               },
+               {
+                   {
+                       {16832800, 1408760}, {16667299, 1434960},
+                       {16505600, 1478310}, {16349199, 1538330},
+                       {16200001, 1614360}, {16059500, 1705570},
+                       {15929400, 1810970}, {15811000, 1929390},
+                       {15705600, 2059540}, {15614400, 2200000},
+                       {15538300, 2349220}, {15478300, 2505570},
+                       {15435000, 2667340}, {15408800, 2832750},
+                       {15400000, 3000000}, {15408800, 3167240},
+                       {15435000, 3332660}, {15478300, 3494430},
+                       {15538300, 3650780}, {15614400, 3800000},
+                       {15705600, 3940460}, {15811000, 4070610},
+                       {15929400, 4189030}, {16059500, 4294430},
+                       {16200001, 4385640}, {16349199, 4461670},
+                       {16505600, 4521690}, {16667299, 4565040},
+                       {16832800, 4591230}, {17000000, 4600000},
+                       {17167200, 4591230}, {17332700, 4565040},
+                       {17494400, 4521690}, {17650800, 4461670},
+                       {17800000, 4385640}, {17940500, 4294430},
+                       {18070600, 4189030}, {18189000, 4070610},
+                       {18294400, 3940460}, {18385600, 3800000},
+                       {18461700, 3650780}, {18521700, 3494430},
+                       {18565000, 3332660}, {18591200, 3167240},
+                       {18600000, 3000000}, {18591200, 2832750},
+                       {18565000, 2667340}, {18521700, 2505570},
+                       {18461700, 2349220}, {18385600, 2200000},
+                       {18294400, 2059540}, {18189000, 1929390},
+                       {18070600, 1810970}, {17940500, 1705570},
+                       {17800000, 1614360}, {17650800, 1538330},
+                       {17494400, 1478310}, {17332700, 1434960},
+                       {17167200, 1408760}, {17000000, 1400000},
+                   },
+                   {
+                       {-11603600, -2146740}, {-11809200, -2120770},
+                       {-12009900, -2069240}, {-12202500, -1992960},
+                       {-12384100, -1893140}, {-12551700, -1771350},
+                       {-12702800, -1629500}, {-12834900, -1469840},
+                       {-12945900, -1294890}, {-13034100, -1107400},
+                       {-13098200, -910337},  {-13137000, -706800},
+                       {-13150000, -499999},  {-13137000, -293200},
+                       {-13098200, -89661},   {-13034100, 107405},
+                       {-12945900, 294893},   {-12834900, 469845},
+                       {-12702800, 629502},   {-12551700, 771346},
+                       {-12384100, 893141},   {-12202500, 992964},
+                       {-12009900, 1069240},  {-11809200, 1120770},
+                       {-11603600, 1146740},  {-11396400, 1146740},
+                       {-11190800, 1120770},  {-10990100, 1069240},
+                       {-10797500, 992964},   {-10615900, 893141},
+                       {-10448200, 771346},   {-10297200, 629502},
+                       {-10165100, 469845},   {-10054100, 294893},
+                       {-9965870, 107405},    {-9901840, -89661},
+                       {-9863010, -293200},   {-9850000, -500000},
+                       {-9863010, -706800},   {-9901840, -910337},
+                       {-9965870, -1107400},  {-10054100, -1294890},
+                       {-10165100, -1469840}, {-10297200, -1629500},
+                       {-10448200, -1771350}, {-10615900, -1893140},
+                       {-10797500, -1992960}, {-10990100, -2069240},
+                       {-11190800, -2120770}, {-11396400, -2146740},
+                   },
+                   {
+                       {-37917200, -40091200}, {-38244400, -40021700},
+                       {-38550000, -39885600}, {-38820600, -39689000},
+                       {-39044400, -39440500}, {-39211700, -39150800},
+                       {-39315000, -38832700}, {-39350000, -38500000},
+                       {-39315000, -38167300}, {-39211700, -37849200},
+                       {-39044400, -37559500}, {-38820600, -37311000},
+                       {-38550000, -37114400}, {-38244400, -36978300},
+                       {-37917200, -36908800}, {-37582800, -36908800},
+                       {-37255600, -36978300}, {-36950000, -37114400},
+                       {-36679400, -37311000}, {-36455600, -37559500},
+                       {-36288300, -37849200}, {-36185000, -38167300},
+                       {-36150000, -38500000}, {-36185000, -38832700},
+                       {-36288300, -39150800}, {-36455600, -39440500},
+                       {-36679400, -39689000}, {-36950000, -39885600},
+                       {-37255600, -40021700}, {-37582800, -40091200},
+                   },
+                   {
+                       {14353700, -41892300}, {14067400, -41831500},
+                       {13800000, -41712400}, {13563200, -41540400},
+                       {13367400, -41322900}, {13221000, -41069400},
+                       {13130600, -40791100}, {13100000, -40500000},
+                       {13130600, -40208900}, {13221000, -39930600},
+                       {13367400, -39677100}, {13563200, -39459600},
+                       {13800000, -39287600}, {14067400, -39168500},
+                       {14353700, -39107700}, {14646300, -39107700},
+                       {14932600, -39168500}, {15200000, -39287600},
+                       {15436800, -39459600}, {15632600, -39677100},
+                       {15779000, -39930600}, {15869400, -40208900},
+                       {15900000, -40500000}, {15869400, -40791100},
+                       {15779000, -41069400}, {15632600, -41322900},
+                       {15436800, -41540400}, {15200000, -41712400},
+                       {14932600, -41831500}, {14646300, -41892300},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "Einsy-base.stl":
+        MyPoly{{
+                   {85000000, 2000000},
+                   {87000000, 5464100},
+                   {91000000, 5464100},
+                   {93000000, 2000000},
+                   {91845296, 0},
+                   {118500000, 0},
+                   {118500000, 79000000},
+                   {105500000, 92000000},
+                   {0, 92000000},
+                   {0, 41000000},
+                   {-5000000, 41000000},
+                   {-9000000, 38000000},
+                   {-9000000, 18000000},
+                   {-5000000, 15000000},
+                   {0, 15000000},
+                   {0, 0},
+                   {86154704, 0},
+               },
+               {
+                   {
+                       {58301400, 86110400}, {57912900, 86193000},
+                       {57550000, 86354600}, {57228700, 86588000},
+                       {56962900, 86883200}, {56764300, 87227200},
+                       {56641500, 87605000}, {56600000, 88000000},
+                       {56641500, 88395000}, {56764300, 88772800},
+                       {56962900, 89116800}, {57228700, 89412000},
+                       {57550000, 89645400}, {57912900, 89807000},
+                       {58301400, 89889600}, {58698600, 89889600},
+                       {59087100, 89807000}, {59450000, 89645400},
+                       {59771300, 89412000}, {60037100, 89116800},
+                       {60235700, 88772800}, {60358500, 88395000},
+                       {60400000, 88000000}, {60358500, 87605000},
+                       {60235700, 87227200}, {60037100, 86883200},
+                       {59771300, 86588000}, {59450000, 86354600},
+                       {59087100, 86193000}, {58698600, 86110400},
+                   },
+                   {
+                       {78916400, 80204400}, {78752800, 80239200},
+                       {78600000, 80307200}, {78464696, 80405504},
+                       {78352800, 80529800}, {78269200, 80674600},
+                       {78217496, 80833704}, {78200000, 81000000},
+                       {78217496, 81166296}, {78269200, 81325400},
+                       {78352800, 81470200}, {78464696, 81594496},
+                       {78600000, 81692800}, {78752800, 81760800},
+                       {78916400, 81795600}, {79083600, 81795600},
+                       {79247200, 81760800}, {79400000, 81692800},
+                       {79535304, 81594496}, {79647200, 81470200},
+                       {79730800, 81325400}, {79782504, 81166296},
+                       {79800000, 81000000}, {79782504, 80833704},
+                       {79730800, 80674600}, {79647200, 80529800},
+                       {79535304, 80405504}, {79400000, 80307200},
+                       {79247200, 80239200}, {79083600, 80204400},
+                   },
+                   {
+                       {20916400, 80204400}, {20752800, 80239200},
+                       {20600000, 80307200}, {20464700, 80405504},
+                       {20352800, 80529800}, {20269200, 80674600},
+                       {20217500, 80833704}, {20200000, 81000000},
+                       {20217500, 81166296}, {20269200, 81325400},
+                       {20352800, 81470200}, {20464700, 81594496},
+                       {20600000, 81692800}, {20752800, 81760800},
+                       {20916400, 81795600}, {21083600, 81795600},
+                       {21247200, 81760800}, {21400000, 81692800},
+                       {21535300, 81594496}, {21647200, 81470200},
+                       {21730800, 81325400}, {21782500, 81166296},
+                       {21800000, 81000000}, {21782500, 80833704},
+                       {21730800, 80674600}, {21647200, 80529800},
+                       {21535300, 80405504}, {21400000, 80307200},
+                       {21247200, 80239200}, {21083600, 80204400},
+                   },
+                   {
+                       {81000000, 60500000},
+                       {81000000, 78500000},
+                       {84650000, 78500000},
+                       {84650000, 60500000},
+                   },
+                   {
+                       {70000000, 60500000},
+                       {70000000, 78500000},
+                       {73650000, 78500000},
+                       {73650000, 60500000},
+                   },
+                   {
+                       {75500000, 60500000},
+                       {75500000, 78500000},
+                       {79150000, 78500000},
+                       {79150000, 60500000},
+                   },
+                   {
+                       {26000000, 60500000},
+                       {26000000, 78500000},
+                       {29650000, 78500000},
+                       {29650000, 60500000},
+                   },
+                   {
+                       {86500000, 60500000},
+                       {86500000, 78500000},
+                       {90150000, 78500000},
+                       {90150000, 60500000},
+                   },
+                   {
+                       {48000000, 60500000},
+                       {48000000, 78500000},
+                       {51650000, 78500000},
+                       {51650000, 60500000},
+                   },
+                   {
+                       {64500000, 60500000},
+                       {64500000, 78500000},
+                       {68150000, 78500000},
+                       {68150000, 60500000},
+                   },
+                   {
+                       {59000000, 60500000},
+                       {59000000, 78500000},
+                       {62650000, 78500000},
+                       {62650000, 60500000},
+                   },
+                   {
+                       {20500000, 60500000},
+                       {20500000, 78500000},
+                       {24150000, 78500000},
+                       {24150000, 60500000},
+                   },
+                   {
+                       {92000000, 60500000},
+                       {92000000, 78500000},
+                       {95650000, 78500000},
+                       {95650000, 60500000},
+                   },
+                   {
+                       {42500000, 60500000},
+                       {42500000, 78500000},
+                       {46150000, 78500000},
+                       {46150000, 60500000},
+                   },
+                   {
+                       {31500000, 60500000},
+                       {31500000, 78500000},
+                       {35150000, 78500000},
+                       {35150000, 60500000},
+                   },
+                   {
+                       {37000000, 60500000},
+                       {37000000, 78500000},
+                       {40650000, 78500000},
+                       {40650000, 60500000},
+                   },
+                   {
+                       {53500000, 60500000},
+                       {53500000, 78500000},
+                       {57150000, 78500000},
+                       {57150000, 60500000},
+                   },
+                   {
+                       {7301400, 73110400}, {6912870, 73193000},
+                       {6550000, 73354600}, {6228650, 73588000},
+                       {5962870, 73883200}, {5900000, 73992104},
+                       {5764260, 74227200}, {5641520, 74605000},
+                       {5600000, 75000000}, {5641520, 75395000},
+                       {5764260, 75772800}, {5900000, 76007896},
+                       {5962870, 76116800}, {6228650, 76412000},
+                       {6550000, 76645400}, {6912870, 76807000},
+                       {7301400, 76889600}, {7698600, 76889600},
+                       {8087129, 76807000}, {8450000, 76645400},
+                       {8771350, 76412000}, {9037130, 76116800},
+                       {9100000, 76007896}, {9235740, 75772800},
+                       {9358480, 75395000}, {9400000, 75000000},
+                       {9358480, 74605000}, {9235740, 74227200},
+                       {9100000, 73992104}, {9037130, 73883200},
+                       {8771350, 73588000}, {8450000, 73354600},
+                       {8087129, 73193000}, {7698600, 73110400},
+                   },
+                   {
+                       {102301000, 73110400}, {101913000, 73193000},
+                       {101550000, 73354600}, {101229000, 73588000},
+                       {100963000, 73883200}, {100764000, 74227200},
+                       {100642000, 74605000}, {100600000, 75000000},
+                       {100642000, 75395000}, {100764000, 75772800},
+                       {100963000, 76116800}, {101229000, 76412000},
+                       {101550000, 76645400}, {101913000, 76807000},
+                       {102301000, 76889600}, {102699000, 76889600},
+                       {103087000, 76807000}, {103450000, 76645400},
+                       {103771000, 76412000}, {104037000, 76116800},
+                       {104236000, 75772800}, {104358000, 75395000},
+                       {104400000, 75000000}, {104358000, 74605000},
+                       {104236000, 74227200}, {104037000, 73883200},
+                       {103771000, 73588000}, {103450000, 73354600},
+                       {103087000, 73193000}, {102699000, 73110400},
+                   },
+                   {
+                       {37000000, 35500000},
+                       {37000000, 53500000},
+                       {40650000, 53500000},
+                       {40650000, 35500000},
+                   },
+                   {
+                       {53500000, 35500000},
+                       {53500000, 53500000},
+                       {57150000, 53500000},
+                       {57150000, 35500000},
+                   },
+                   {
+                       {75500000, 35500000},
+                       {75500000, 53500000},
+                       {79150000, 53500000},
+                       {79150000, 35500000},
+                   },
+                   {
+                       {31500000, 35500000},
+                       {31500000, 53500000},
+                       {35150000, 53500000},
+                       {35150000, 35500000},
+                   },
+                   {
+                       {92000000, 35500000},
+                       {92000000, 53500000},
+                       {95650000, 53500000},
+                       {95650000, 35500000},
+                   },
+                   {
+                       {81000000, 35500000},
+                       {81000000, 53500000},
+                       {84650000, 53500000},
+                       {84650000, 35500000},
+                   },
+                   {
+                       {86500000, 35500000},
+                       {86500000, 53500000},
+                       {90150000, 53500000},
+                       {90150000, 35500000},
+                   },
+                   {
+                       {48000000, 35500000},
+                       {48000000, 53500000},
+                       {51650000, 53500000},
+                       {51650000, 35500000},
+                   },
+                   {
+                       {42500000, 35500000},
+                       {42500000, 53500000},
+                       {46150000, 53500000},
+                       {46150000, 35500000},
+                   },
+                   {
+                       {70000000, 35500000},
+                       {70000000, 53500000},
+                       {73650000, 53500000},
+                       {73650000, 35500000},
+                   },
+                   {
+                       {20500000, 35500000},
+                       {20500000, 53500000},
+                       {24150000, 53500000},
+                       {24150000, 35500000},
+                   },
+                   {
+                       {59000000, 35500000},
+                       {59000000, 53500000},
+                       {62650000, 53500000},
+                       {62650000, 35500000},
+                   },
+                   {
+                       {64500000, 35500000},
+                       {64500000, 53500000},
+                       {68150000, 53500000},
+                       {68150000, 35500000},
+                   },
+                   {
+                       {26000000, 35500000},
+                       {26000000, 53500000},
+                       {29650000, 53500000},
+                       {29650000, 35500000},
+                   },
+                   {
+                       {16290899, 8010959},  {15882000, 8097890},
+                       {15500000, 8267950},  {15161700, 8513710},
+                       {14882000, 8824430},  {14672900, 9186530},
+                       {14543700, 9584180},  {14500000, 10000000},
+                       {14500000, 34000000}, {14543700, 34415800},
+                       {14672900, 34813500}, {14882000, 35175600},
+                       {15161700, 35486300}, {15500000, 35732000},
+                       {15882000, 35902100}, {16290899, 35989000},
+                       {16709101, 35989000}, {17118000, 35902100},
+                       {17500000, 35732000}, {17838300, 35486300},
+                       {18118000, 35175600}, {18327100, 34813500},
+                       {18456300, 34415800}, {18500000, 34000000},
+                       {18500000, 10000000}, {18456300, 9584180},
+                       {18327100, 9186530},  {18118000, 8824430},
+                       {17838300, 8513710},  {17500000, 8267950},
+                       {17118000, 8097890},  {16709101, 8010959},
+                   },
+                   {
+                       {59000000, 10500000},
+                       {59000000, 28500000},
+                       {62650000, 28500000},
+                       {62650000, 10500000},
+                   },
+                   {
+                       {81000000, 10500000},
+                       {81000000, 28500000},
+                       {84650000, 28500000},
+                       {84650000, 10500000},
+                   },
+                   {
+                       {75500000, 10500000},
+                       {75500000, 28500000},
+                       {79150000, 28500000},
+                       {79150000, 10500000},
+                   },
+                   {
+                       {70000000, 10500000},
+                       {70000000, 28500000},
+                       {73650000, 28500000},
+                       {73650000, 10500000},
+                   },
+                   {
+                       {20500000, 10500000},
+                       {20500000, 28500000},
+                       {24150000, 28500000},
+                       {24150000, 10500000},
+                   },
+                   {
+                       {92000000, 10500000},
+                       {92000000, 28500000},
+                       {95650000, 28500000},
+                       {95650000, 10500000},
+                   },
+                   {
+                       {26000000, 10500000},
+                       {26000000, 28500000},
+                       {29650000, 28500000},
+                       {29650000, 10500000},
+                   },
+                   {
+                       {53500000, 10500000},
+                       {53500000, 28500000},
+                       {57150000, 28500000},
+                       {57150000, 10500000},
+                   },
+                   {
+                       {48000000, 10500000},
+                       {48000000, 28500000},
+                       {51650000, 28500000},
+                       {51650000, 10500000},
+                   },
+                   {
+                       {42500000, 10500000},
+                       {42500000, 28500000},
+                       {46150000, 28500000},
+                       {46150000, 10500000},
+                   },
+                   {
+                       {37000000, 10500000},
+                       {37000000, 28500000},
+                       {40650000, 28500000},
+                       {40650000, 10500000},
+                   },
+                   {
+                       {31500000, 10500000},
+                       {31500000, 28500000},
+                       {35150000, 28500000},
+                       {35150000, 10500000},
+                   },
+                   {
+                       {64500000, 10500000},
+                       {64500000, 28500000},
+                       {68150000, 28500000},
+                       {68150000, 10500000},
+                   },
+                   {
+                       {86500000, 10500000},
+                       {86500000, 28500000},
+                       {90150000, 28500000},
+                       {90150000, 10500000},
+                   },
+                   {
+                       {102301000, 12110400}, {101913000, 12193000},
+                       {101550000, 12354600}, {101229000, 12588000},
+                       {100963000, 12883200}, {100764000, 13227200},
+                       {100642000, 13605000}, {100600000, 14000000},
+                       {100642000, 14395000}, {100764000, 14772800},
+                       {100963000, 15116800}, {101229000, 15412000},
+                       {101550000, 15645400}, {101913000, 15807000},
+                       {102301000, 15889600}, {102699000, 15889600},
+                       {103087000, 15807000}, {103450000, 15645400},
+                       {103771000, 15412000}, {104037000, 15116800},
+                       {104236000, 14772800}, {104358000, 14395000},
+                       {104400000, 14000000}, {104358000, 13605000},
+                       {104236000, 13227200}, {104037000, 12883200},
+                       {103771000, 12588000}, {103450000, 12354600},
+                       {103087000, 12193000}, {102699000, 12110400},
+                   },
+                   {
+                       {7301400, 12110400}, {6912870, 12193000},
+                       {6550000, 12354600}, {6228650, 12588000},
+                       {5962870, 12883200}, {5900000, 12992100},
+                       {5764260, 13227200}, {5641520, 13605000},
+                       {5600000, 14000000}, {5641520, 14395000},
+                       {5764260, 14772800}, {5900000, 15007900},
+                       {5962870, 15116800}, {6228650, 15412000},
+                       {6550000, 15645400}, {6912870, 15807000},
+                       {7301400, 15889600}, {7698600, 15889600},
+                       {8087129, 15807000}, {8450000, 15645400},
+                       {8771350, 15412000}, {9037130, 15116800},
+                       {9100000, 15007900}, {9235740, 14772800},
+                       {9358480, 14395000}, {9400000, 14000000},
+                       {9358480, 13605000}, {9235740, 13227200},
+                       {9100000, 12992100}, {9037130, 12883200},
+                       {8771350, 12588000}, {8450000, 12354600},
+                       {8087129, 12193000}, {7698600, 12110400},
+                   },
+               }},
+    },
+    ExPolygons{
+        // "lcd-supports.stl":
+        MyPoly{{
+                   {4192390, 4192390},    {4192390, 5707110},
+                   {2474870, 7424620},    {1626350, 6576090},
+                   {3040560, 5161880},    {1767770, 3889090},
+                   {-2474870, 8131730},   {-5303300, 5303300},
+                   {-36769600, 36769600}, {-33941100, 39598000},
+                   {-38183750, 43840650}, {-36911000, 45113400},
+                   {-35496800, 43699200}, {-34648200, 44547700},
+                   {-36769600, 46669000}, {-38183800, 46669000},
+                   {-46852800, 38000000}, {-61500000, 38000000},
+                   {-61500000, 12000000}, {-50000000, 12000000},
+                   {-50000000, 11984300}, {-37204500, -811183},
+                   {-811183, -811183},
+               },
+               {
+                   {
+                       {-36000000, 8000000},
+                       {-51500000, 23500000},
+                       {-37357900, 23500000},
+                       {-21857900, 8000000},
+                   },
+               }},
+        MyPoly{{
+                   {-13147200, -40000000}, {1500000, -40000000},
+                   {1500000, -14000000},   {-10000000, -14000000},
+                   {-10000000, -13984300}, {-22795500, -1188820},
+                   {-59188800, -1188820},  {-64192400, -6192390},
+                   {-64192400, -7707110},  {-62474900, -9424620},
+                   {-61626300, -8576090},  {-63040571, -7161851},
+                   {-61767800, -5889090},  {-57525100, -10131700},
+                   {-54696700, -7303300},  {-23230400, -38769600},
+                   {-26058900, -41598000}, {-21816250, -45840650},
+                   {-23089000, -47113400}, {-24503200, -45699200},
+                   {-25351800, -46547700}, {-23230400, -48669000},
+                   {-21816200, -48669000},
+               },
+               {
+                   {
+                       {-22642100, -25500000},
+                       {-38142100, -10000000},
+                       {-24000000, -10000000},
+                       {-9357800, -24642200},
+                       {-9288210, -24711800},
+                       {-8500000, -25500000},
+                   },
+               }},
+    },
+};
diff --git a/src/libseqarrange/test/prusaparts.hpp b/src/libseqarrange/test/prusaparts.hpp
new file mode 100644
index 0000000000..e4fa33cf49
--- /dev/null
+++ b/src/libseqarrange/test/prusaparts.hpp
@@ -0,0 +1,14 @@
+#ifndef PRUSAPARTS_H
+#define PRUSAPARTS_H
+
+#include <vector>
+#include "libslic3r/ExPolygon.hpp"
+
+using TestData = std::vector<Slic3r::Polygon>;
+using TestDataEx = std::vector<Slic3r::ExPolygons>;
+
+extern const TestData PRUSA_PART_POLYGONS;
+extern const TestData PRUSA_STEGOSAUR_POLYGONS;
+extern const TestDataEx PRUSA_PART_POLYGONS_EX;
+
+#endif // PRUSAPARTS_H
diff --git a/src/libseqarrange/test/seq_test_arrangement.cpp b/src/libseqarrange/test/seq_test_arrangement.cpp
new file mode 100644
index 0000000000..6df36e482c
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_arrangement.cpp
@@ -0,0 +1,1023 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_arrangement.cpp
+ *
+ * Basic steel sheet object arrangement test via
+ * Constraint Programming tools.
+ */
+/*================================================================*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <gecode/driver.hh>
+#include <gecode/int.hh>
+#include <gecode/minimodel.hh>
+#include <gecode/search.hh>
+
+#include "seq_defs.hpp"
+
+#include "seq_test_arrangement.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+
+using namespace Gecode;
+
+
+/*----------------------------------------------------------------*/
+
+class Queens : public Script {
+public:
+  /// Position of queens on boards
+  IntVarArray q;    
+  /// Propagation to use for model
+    
+  Queens(const SizeOptions& opt)
+      : Script(opt), q(*this, opt.size(), 0, opt.size()-1) {
+      
+    const int n = q.size();
+    
+    for (int i = 0; i<n; i++)
+    {
+        for (int j = i+1; j<n; j++)
+	{
+	    rel(*this, q[i] != q[j]);
+	    rel(*this, q[i]+i != q[j]+j);
+	    rel(*this, q[i]-i != q[j]-j);
+        }
+    }
+
+    branch(*this, q, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+    
+  }
+
+  /// Constructor for cloning
+  Queens(Queens& s) : Script(s) {
+    q.update(*this, s.q);
+  }
+
+  /// Perform copying during cloning
+  virtual Space*
+  copy(void) {
+    return new Queens(*this);
+  }
+    
+  /// Print solution    
+  virtual void
+  print(std::ostream& os) const {
+    os << "queens\t";
+    
+    for (int i = 0; i < q.size(); i++) {
+      os << q[i] << ", ";
+    }
+    os << std::endl;
+  }
+};
+
+
+void test_arrangement_1(void)
+{
+    printf("Testing sheet arrangement 1 ...\n");
+
+    SizeOptions opt("Queens");
+    opt.iterations(200);
+    opt.size(100);
+        
+    Script::run<Queens,LDS,SizeOptions>(opt);
+    
+    
+    printf("Testing sheet arrangement 1 ... finished\n");    
+}
+
+
+class SimpleProblem : public Space
+{
+public:
+    IntVarArray vars;
+    IntVar X, Y, Z;
+
+public:
+    SimpleProblem()
+	: vars(*this, 3, 0, 3)
+	, X(vars[0])
+	, Y(vars[1])
+	, Z(vars[2])
+    {
+	rel(*this, X != Y);
+	rel(*this, Y != Z);
+	rel(*this, X != Z);
+
+	branch(*this, vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());		
+    };
+
+    SimpleProblem(SimpleProblem &s)
+	: Space(s)
+    {
+	X.update(*this, s.X);
+	Y.update(*this, s.Y);
+	Z.update(*this, s.Z);
+    }
+
+    virtual Space* copy(void) {
+	return new SimpleProblem(*this);
+    };
+
+    void print(void) const
+    {
+	/*
+	cout << X << endl;
+	cout << Y << endl;
+	cout << Z << endl;		
+	*/
+	printf("XYZ: %d, %d, %d\n", X.val(), Y.val(), Z.val());
+    };
+};
+
+
+const int sheet_size = 9;
+
+const int Obj1_width  = 5;
+const int Obj1_height = 4;
+
+const int Obj2_width  = 3;
+const int Obj2_height = 7;
+
+const int Obj3_width  = 5;
+const int Obj3_height = 5;
+
+class ArrangementProblem : public Space
+{
+public:
+    IntVarArray vars;
+    IntVar Obj1_x, Obj1_y;
+    IntVar Obj2_x, Obj2_y;
+    IntVar Obj3_x, Obj3_y;        
+    
+public:
+    ArrangementProblem()
+	: vars(*this, 6, 0, sheet_size - 1)
+	, Obj1_x(vars[0])
+	, Obj1_y(vars[1])	  
+	, Obj2_x(vars[2])
+	, Obj2_y(vars[3])
+	, Obj3_x(vars[4])
+	, Obj3_y(vars[5])	  
+    {
+	IntArgs widths(3);
+	widths[0] = Obj1_width;
+	widths[1] = Obj2_width;
+	widths[2] = Obj3_width;
+
+	IntArgs heights(3);
+	heights[0] = Obj1_height;
+	heights[1] = Obj2_height;
+	heights[2] = Obj3_height;
+
+	IntVarArgs Xs(3);
+	Xs[0] = Obj1_x;
+	Xs[1] = Obj2_x;
+	Xs[2] = Obj3_x;
+
+	IntVarArgs Ys(3);	
+	Ys[0] = Obj1_y;
+	Ys[1] = Obj2_y;
+	Ys[2] = Obj3_y;			       
+
+	nooverlap(*this, Xs, widths, Ys, heights);
+
+	rel(*this, Obj1_x + Obj1_width <= sheet_size);
+	rel(*this, Obj2_x + Obj2_width <= sheet_size);
+	rel(*this, Obj3_x + Obj3_width <= sheet_size);
+
+	rel(*this, Obj2_x == Obj1_x + 5);
+	rel(*this, Obj2_y == Obj1_y + 1);
+
+	rel(*this, Obj1_y + Obj1_height <= sheet_size);
+	rel(*this, Obj2_y + Obj2_height <= sheet_size);
+	rel(*this, Obj3_y + Obj3_height <= sheet_size);		
+	
+	branch(*this, vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+    };
+
+    ArrangementProblem(ArrangementProblem &s)
+	: Space(s)
+    {
+	Obj1_x.update(*this, s.Obj1_x);	
+	Obj1_y.update(*this, s.Obj1_y);
+
+	Obj2_x.update(*this, s.Obj2_x);	
+	Obj2_y.update(*this, s.Obj2_y);
+
+	Obj3_x.update(*this, s.Obj3_x);	
+	Obj3_y.update(*this, s.Obj3_y);
+    }
+
+    virtual Space* copy(void) {
+	return new ArrangementProblem(*this);
+    };
+
+    void print(void) const
+    {
+	/*
+	cout << X << endl;
+	cout << Y << endl;
+	cout << Z << endl;		
+	*/
+	printf("Position obj1: %d, %d\n", Obj1_x.val(), Obj1_y.val());
+	printf("Position obj2: %d, %d\n", Obj2_x.val(), Obj2_y.val());
+	printf("Position obj2: %d, %d\n", Obj3_x.val(), Obj3_y.val());
+    };
+};
+
+
+const int sheet_resolution = 20;
+const int time_resolution = 80;
+
+const int low_Obj1_width  = 5;
+const int low_Obj1_height = 4;
+const int low_Obj1_duration = 10;
+
+const int low_Obj2_width  = 3;
+const int low_Obj2_height = 7;
+const int low_Obj2_duration = 15;
+
+const int low_Obj3_width  = 4;
+const int low_Obj3_height = 4;
+const int low_Obj3_duration = 5;
+
+const int high_Obj1_width  = 2;
+const int high_Obj1_height = 2;
+const int high_Obj1_duration = 35;
+
+const int kine_width = 100;
+const int kine_height = 10;
+
+
+class SimpleSequentialProblem : public Space
+{
+public:
+    IntVarArray space_vars;
+    IntVarArray time_vars;
+    IntVarArray kine_vars;
+    
+    IntVar low_Obj1_x, low_Obj1_y, low_Obj1_t;
+    IntVar low_Obj2_x, low_Obj2_y, low_Obj2_t;
+    IntVar low_Obj3_x, low_Obj3_y, low_Obj3_t;    
+    
+    IntVar high_Obj1_x, high_Obj1_y, high_Obj1_t;        
+    
+public:
+    SimpleSequentialProblem()
+	: space_vars(*this, 8, 0, sheet_resolution)
+  	, time_vars(*this, 4, 0, time_resolution)
+	, kine_vars(*this, 2, 0, sheet_resolution)
+	  
+	, low_Obj1_x(space_vars[0])
+	, low_Obj1_y(space_vars[1])
+	, low_Obj1_t(time_vars[0])
+	  
+	, low_Obj2_x(space_vars[2])
+	, low_Obj2_y(space_vars[3])
+	, low_Obj2_t(time_vars[1])
+
+	, low_Obj3_x(space_vars[4])
+	, low_Obj3_y(space_vars[5])
+	, low_Obj3_t(time_vars[2])	  
+
+	, high_Obj1_x(space_vars[6])
+	, high_Obj1_y(space_vars[7])
+	, high_Obj1_t(time_vars[3])	  	  
+    {
+	printf("alpha 1\n");
+	BoolVar low_Obj1_present = expr(*this, low_Obj1_t >= 0);
+	BoolVar low_Obj2_present = expr(*this, low_Obj2_t >= 0);
+	BoolVar low_Obj3_present = expr(*this, low_Obj3_t >= 0);	
+	BoolVar high_Obj1_present = expr(*this, high_Obj1_t >= 0);
+	//BoolVar low_Obj1_above_high_Obj1 = expr(*this, low_Obj1_t >= high_Obj1_t);	
+
+	printf("alpha 2\n");	
+	BoolVarArgs objects_present(4);
+	objects_present[0] = low_Obj1_present;
+	objects_present[1] = low_Obj2_present;
+	objects_present[2] = low_Obj3_present;	
+	objects_present[3] = high_Obj1_present;
+	//objects_present[3] = low_Obj1_above_high_Obj1;			
+	
+	IntArgs kine_widths(1);
+	IntArgs kine_heights(1);
+
+	IntVar kine_Obj1_x(kine_vars[0]);
+	IntVar kine_Obj1_y(kine_vars[1]);
+	printf("alpha 3\n");
+	kine_widths[0] = kine_width;
+	kine_heights[0] = kine_height;
+
+	rel(*this, kine_Obj1_x == high_Obj1_x + high_Obj1_width);
+	rel(*this, kine_Obj1_y == high_Obj1_y - 3);
+
+	IntArgs widths(4);
+	widths[0] = low_Obj1_width;
+	widths[1] = low_Obj2_width;
+	widths[2] = low_Obj3_width;	
+	widths[3] = high_Obj1_width;
+	//widths[3] = kine_width;
+
+	IntArgs heights(4);
+	heights[0] = low_Obj1_height;
+	heights[1] = low_Obj2_height;
+	heights[2] = low_Obj3_height;	
+	heights[3] = high_Obj1_height;
+	//heights[3] = kine_height;
+	printf("alpha 4\n");
+	
+	IntVarArgs Xs(4);
+	Xs[0] = low_Obj1_x;
+	Xs[1] = low_Obj2_x;
+	Xs[2] = low_Obj3_x;	
+	Xs[3] = high_Obj1_x;
+	//Xs[3] = kine_Obj1_x;
+
+	IntVarArgs Ys(4);	
+	Ys[0] = low_Obj1_y;
+	Ys[1] = low_Obj2_y;
+	Ys[2] = low_Obj3_y;	
+	Ys[3] = high_Obj1_y;
+	//Ys[3] = kine_Obj1_y;	
+	printf("alpha 5\n");
+	
+	nooverlap(*this, Xs, widths, Ys, heights/*, objects_present*/);
+	printf("alpha 6\n");
+
+	rel(*this, low_Obj1_t >= low_Obj2_t + low_Obj2_duration || low_Obj2_t >= low_Obj1_t + low_Obj1_duration);
+	rel(*this, low_Obj1_t >= low_Obj3_t + low_Obj3_duration || low_Obj3_t >= low_Obj1_t + low_Obj1_duration);
+	rel(*this, low_Obj2_t >= low_Obj3_t + low_Obj3_duration || low_Obj3_t >= low_Obj2_t + low_Obj2_duration);	
+
+	rel(*this, low_Obj3_t >= high_Obj1_t + high_Obj1_duration || high_Obj1_t >= low_Obj3_t + low_Obj3_duration);	
+	rel(*this, low_Obj2_t >= high_Obj1_t + high_Obj1_duration || high_Obj1_t >= low_Obj2_t + low_Obj2_duration);
+	rel(*this, low_Obj1_t >= high_Obj1_t + high_Obj1_duration || high_Obj1_t >= low_Obj1_t + low_Obj1_duration);		
+	
+	rel(*this, low_Obj1_x + low_Obj1_width <= sheet_resolution);
+	rel(*this, low_Obj2_x + low_Obj2_width <= sheet_resolution);
+	rel(*this, low_Obj3_x + low_Obj3_width <= sheet_resolution);	
+	rel(*this, high_Obj1_x + high_Obj1_width <= sheet_resolution);	
+
+	rel(*this, low_Obj1_y + low_Obj1_height <= sheet_resolution);
+	rel(*this, low_Obj2_y + low_Obj2_height <= sheet_resolution);
+	rel(*this, low_Obj3_y + low_Obj3_height <= sheet_resolution);	
+	rel(*this, high_Obj1_y + high_Obj1_height <= sheet_resolution);
+	
+	rel(*this, low_Obj1_t + low_Obj1_duration <= time_resolution);
+	rel(*this, low_Obj2_t + low_Obj2_duration <= time_resolution);
+	rel(*this, low_Obj3_t + low_Obj3_duration <= time_resolution);	
+	rel(*this, high_Obj1_t + high_Obj1_duration <= time_resolution);
+
+	rel(*this, low_Obj1_t < high_Obj1_t || low_Obj1_x >= kine_Obj1_x + kine_width || kine_Obj1_x >= low_Obj1_x + low_Obj1_width
+					    || low_Obj1_y >= kine_Obj1_y + kine_height || kine_Obj1_y >= low_Obj1_y + low_Obj1_height);
+
+	rel(*this, low_Obj2_t < high_Obj1_t || low_Obj2_x >= kine_Obj1_x + kine_width || kine_Obj1_x >= low_Obj2_x + low_Obj2_width
+					    || low_Obj2_y >= kine_Obj1_y + kine_height || kine_Obj1_y >= low_Obj2_y + low_Obj2_height);
+
+	rel(*this, low_Obj3_t < high_Obj1_t || low_Obj3_x >= kine_Obj1_x + kine_width || kine_Obj1_x >= low_Obj3_x + low_Obj3_width
+					    || low_Obj3_y >= kine_Obj1_y + kine_height || kine_Obj1_y >= low_Obj3_y + low_Obj3_height);		
+
+	rel(*this, high_Obj1_t < 10);
+	rel(*this, high_Obj1_x == 0);	
+	
+	printf("alpha 7\n");
+	
+	branch(*this, space_vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	branch(*this, time_vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	branch(*this, kine_vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	printf("alpha 8\n");	
+    };
+
+    SimpleSequentialProblem(SimpleSequentialProblem &s)
+	: Space(s)
+    {
+	low_Obj1_x.update(*this, s.low_Obj1_x);	
+	low_Obj1_y.update(*this, s.low_Obj1_y);
+	low_Obj1_t.update(*this, s.low_Obj1_t);	
+
+	low_Obj2_x.update(*this, s.low_Obj2_x);	
+	low_Obj2_y.update(*this, s.low_Obj2_y);
+	low_Obj2_t.update(*this, s.low_Obj2_t);
+
+	low_Obj3_x.update(*this, s.low_Obj3_x);	
+	low_Obj3_y.update(*this, s.low_Obj3_y);
+	low_Obj3_t.update(*this, s.low_Obj3_t);		
+
+	high_Obj1_x.update(*this, s.high_Obj1_x);	
+	high_Obj1_y.update(*this, s.high_Obj1_y);
+	high_Obj1_t.update(*this, s.high_Obj1_t);	
+    }
+
+    virtual Space* copy(void) {
+	return new SimpleSequentialProblem(*this);
+    };
+
+    void print(void) const
+    {
+	/*
+	cout << X << endl;
+	cout << Y << endl;
+	cout << Z << endl;		
+	*/
+	printf("Position low obj1 : x:%d, y:%d, t:%d\n", low_Obj1_x.val(), low_Obj1_y.val(), low_Obj1_t.val());
+	printf("Position low obj2 : x:%d, y:%d, t:%d\n", low_Obj2_x.val(), low_Obj2_y.val(), low_Obj2_t.val());
+	printf("Position low obj3 : x:%d, y:%d, t:%d\n", low_Obj3_x.val(), low_Obj3_y.val(), low_Obj3_t.val());	
+	printf("Position high obj1: x:%d, y:%d, t:%d\n", high_Obj1_x.val(), high_Obj1_y.val(), high_Obj1_t.val());
+    };
+};
+
+
+int complex_sheet_resolution = 30;
+
+int complex_sheet_resolution_min = 10;
+int complex_sheet_resolution_max = 200;
+
+int complex_time_resolution = 1000;
+int complex_height_threshold = 25;
+
+const int complex_Obj_count = 10;
+
+int complex_Obj_widths[complex_Obj_count];
+int complex_Obj_heights[complex_Obj_count];
+int complex_Obj_durations[complex_Obj_count];
+
+const int min_width = 4;
+const int max_width = 20;
+
+const int min_height = 4;
+const int max_height = 20;
+
+const int min_duration = 2;
+const int max_duration = 50;
+
+const int gantry_left_height = 10;
+const int gantry_left_shift = 4;
+
+const int gantry_right_height = 10;
+const int gantry_right_shift = 4;
+
+
+class ComplexSequentialProblem : public Space
+{
+public:
+    IntVarArray space_vars;
+    IntVarArray time_vars;
+    IntVarArray kine_vars;
+    
+    IntVar complex_Obj_x[complex_Obj_count];
+    IntVar complex_Obj_y[complex_Obj_count];
+    IntVar complex_Obj_t[complex_Obj_count];
+
+    IntVar gantry_left_y[complex_Obj_count];
+    IntVar gantry_right_y[complex_Obj_count];        
+    
+public:
+    ComplexSequentialProblem()
+	: space_vars(*this, 2 * complex_Obj_count, 0, complex_sheet_resolution)
+  	, time_vars(*this, complex_Obj_count, 0, complex_time_resolution)
+	, kine_vars(*this, 2 * complex_Obj_count, 0, complex_sheet_resolution)
+    {
+	/*
+	int width_span =  max_width - min_width;
+	int height_span =  max_height - min_height;
+	int duration_span =  max_duration - min_duration;		
+	
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    complex_Obj_widths[i] = min_width + rand() % width_span;
+	    complex_Obj_heights[i] = min_height + rand() % height_span;
+	    complex_Obj_durations[i] = min_duration + rand() % duration_span;	    	    
+	}
+	*/
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    complex_Obj_x[i] = space_vars[2 * i];
+	    complex_Obj_y[i] = space_vars[2 * i + 1];
+	    complex_Obj_t[i] = time_vars[i];
+	    
+	    gantry_left_y[i] = kine_vars[2 * i];
+	    gantry_right_y[i] = kine_vars[2 * i + 1];
+	}
+
+	IntArgs widths(complex_Obj_count);
+	IntArgs heights(complex_Obj_count);
+	
+	IntVarArgs X_vars(complex_Obj_count);
+	IntVarArgs Y_vars(complex_Obj_count);		
+
+	for (int i =  0; i < complex_Obj_count; ++i)
+	{
+	    widths[i] = complex_Obj_widths[i];
+	    heights[i] = complex_Obj_heights[i];
+
+	    X_vars[i] = complex_Obj_x[i];
+	    Y_vars[i] = complex_Obj_y[i];
+	}
+	    	
+	nooverlap(*this, X_vars, widths, Y_vars, heights, IPL_BND);   
+
+	for (int i = 0; i < complex_Obj_count - 1; ++i)
+	{
+	    for (int j = i + 1; j < complex_Obj_count; ++j)
+	    {
+		rel(*this, complex_Obj_t[i] >= complex_Obj_t[j] + complex_Obj_durations[j] || complex_Obj_t[j] >= complex_Obj_t[i] + complex_Obj_durations[i], IPL_BND);		
+	    }
+	}
+
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    rel(*this, complex_Obj_x[i] + complex_Obj_widths[i] <= complex_sheet_resolution, IPL_BND);
+	    rel(*this, complex_Obj_y[i] + complex_Obj_heights[i] <= complex_sheet_resolution, IPL_BND);  
+	}
+
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    if (complex_Obj_durations[i] >= complex_height_threshold)
+	    {
+		rel(*this, gantry_left_y[i] == complex_Obj_y[i] + gantry_left_shift);
+		rel(*this, gantry_right_y[i] == complex_Obj_y[i] + gantry_right_shift);		
+	    }
+	}
+	
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    if (complex_Obj_durations[i] >= complex_height_threshold)
+	    {
+		for (int j = 0; j < complex_Obj_count; ++j)
+		{
+		    if (j != i)
+		    {
+		    rel(*this, complex_Obj_t[j] < complex_Obj_t[i]
+			|| complex_Obj_y[j] >= gantry_right_y[i] + gantry_right_height
+			|| gantry_right_y[i] >= complex_Obj_y[j] + complex_Obj_heights[j], IPL_BND);
+		    
+		    rel(*this, complex_Obj_t[j] < complex_Obj_t[i]
+			|| complex_Obj_y[j] >= gantry_left_y[i] + gantry_left_height
+			|| gantry_left_y[i] >= complex_Obj_y[j] + complex_Obj_heights[j], IPL_BND);		    
+		    }
+		}
+	    }
+	}       	
+
+	branch(*this, space_vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	branch(*this, time_vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	branch(*this, kine_vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+    };
+
+    ComplexSequentialProblem(ComplexSequentialProblem &s)
+	: Space(s)
+    {
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    complex_Obj_x[i].update(*this, s.complex_Obj_x[i]);	
+	    complex_Obj_y[i].update(*this, s.complex_Obj_y[i]);
+	    complex_Obj_t[i].update(*this, s.complex_Obj_t[i]);
+	    
+	    gantry_left_y[i].update(*this, s.gantry_left_y[i]);
+	    gantry_right_y[i].update(*this, s.gantry_right_y[i]);
+	}
+    }
+
+    virtual Space* copy(void) {
+	return new ComplexSequentialProblem(*this);
+    };
+
+    void print(void) const
+    {
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{	
+	    printf("Position object: x:%d, y:%d, t:%d (w:%d, h:%d, d:%d)\n",
+		   complex_Obj_x[i].val(),
+		   complex_Obj_y[i].val(),
+		   complex_Obj_t[i].val(),
+		   complex_Obj_widths[i],
+		   complex_Obj_heights[i],
+		   complex_Obj_durations[i]);
+	}
+	
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    if (complex_Obj_durations[i] >= complex_height_threshold)
+	    {
+		printf("Gantry position (%d): left_y:%d right_y:%d\n", i,
+		       gantry_left_y[i].val(),
+		       gantry_right_y[i].val());
+	    }
+	}
+    };
+};
+
+
+int complex_sheet_resolution_X = 200;
+
+int complex_sheet_resolution_X_min = 10;
+int complex_sheet_resolution_X_max = 200;
+
+
+int complex_sheet_resolution_Y = 30;
+
+int complex_sheet_resolution_Y_min = 10;
+int complex_sheet_resolution_Y_max = 200;
+
+
+void generate_random_complex_objects(void)
+{
+    int width_span =  max_width - min_width;
+    int height_span =  max_height - min_height;
+    int duration_span =  max_duration - min_duration;
+	
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	printf("Generating random object %d ...\n", i);
+	complex_Obj_widths[i] = min_width + rand() % width_span;
+	complex_Obj_heights[i] = min_height + rand() % height_span;
+	complex_Obj_durations[i] = min_duration + rand() % duration_span;	    	    
+    }
+}
+
+
+class ComplexSequentialProblemXY : public Space
+{
+public:
+    IntVarArray space_vars_X;
+    IntVarArray space_vars_Y;
+    
+    IntVarArray time_vars;
+    
+    IntVarArray kine_vars_L;
+    IntVarArray kine_vars_R;    
+    
+    IntVar complex_Obj_x[complex_Obj_count];
+    IntVar complex_Obj_y[complex_Obj_count];
+    IntVar complex_Obj_t[complex_Obj_count];
+
+    IntVar gantry_left_y[complex_Obj_count];
+    IntVar gantry_right_y[complex_Obj_count];        
+    
+public:
+    ComplexSequentialProblemXY()
+	: space_vars_X(*this, 2 * complex_Obj_count, 0, complex_sheet_resolution_X)
+	, space_vars_Y(*this, 2 * complex_Obj_count, 0, complex_sheet_resolution_Y)
+  	, time_vars(*this, complex_Obj_count, 0, complex_time_resolution)	  
+	, kine_vars_L(*this, complex_Obj_count, 0, complex_sheet_resolution_Y)
+	, kine_vars_R(*this, complex_Obj_count, 0, complex_sheet_resolution_Y)	  
+    {
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    complex_Obj_x[i] = space_vars_X[2 * i];
+	    complex_Obj_y[i] = space_vars_X[2 * i + 1];
+	    
+	    complex_Obj_t[i] = time_vars[i];
+	    
+	    gantry_left_y[i] = kine_vars_L[i];
+	    gantry_right_y[i] = kine_vars_R[i];
+	}
+
+	IntArgs widths(complex_Obj_count);
+	IntArgs heights(complex_Obj_count);
+	
+	IntVarArgs X_vars(complex_Obj_count);
+	IntVarArgs Y_vars(complex_Obj_count);		
+
+	for (int i =  0; i < complex_Obj_count; ++i)
+	{
+	    widths[i] = complex_Obj_widths[i];
+	    heights[i] = complex_Obj_heights[i];
+
+	    X_vars[i] = complex_Obj_x[i];
+	    Y_vars[i] = complex_Obj_y[i];
+	}
+	    	
+	nooverlap(*this, X_vars, widths, Y_vars, heights, IPL_BND);
+
+	for (int i = 0; i < complex_Obj_count - 1; ++i)
+	{
+	    for (int j = i + 1; j < complex_Obj_count; ++j)
+	    {
+		rel(*this, complex_Obj_t[i] >= complex_Obj_t[j] + complex_Obj_durations[j] || complex_Obj_t[j] >= complex_Obj_t[i] + complex_Obj_durations[i], IPL_BND);		
+	    }
+	}
+
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    rel(*this, complex_Obj_x[i] + complex_Obj_widths[i] <= complex_sheet_resolution_X, IPL_BND);
+	    rel(*this, complex_Obj_y[i] + complex_Obj_heights[i] <= complex_sheet_resolution_Y, IPL_BND);  
+	}
+
+
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    if (complex_Obj_durations[i] >= complex_height_threshold)
+	    {
+		rel(*this, gantry_left_y[i] == complex_Obj_y[i] + gantry_left_shift);
+		rel(*this, gantry_right_y[i] == complex_Obj_y[i] + gantry_right_shift);		
+	    }
+	}
+
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    if (complex_Obj_durations[i] >= complex_height_threshold)
+	    {
+		for (int j = 0; j < complex_Obj_count; ++j)
+		{
+		    if (j != i)
+		    {
+			rel(*this, complex_Obj_t[j] < complex_Obj_t[i]
+			    || complex_Obj_y[j] >= gantry_right_y[i] + gantry_right_height
+			    || gantry_right_y[i] >= complex_Obj_y[j] + complex_Obj_heights[j], IPL_BND);
+		    
+			rel(*this, complex_Obj_t[j] < complex_Obj_t[i]
+			    || complex_Obj_y[j] >= gantry_left_y[i] + gantry_left_height
+			    || gantry_left_y[i] >= complex_Obj_y[j] + complex_Obj_heights[j], IPL_BND);		    
+		    }
+		}
+	    }
+	}       	
+
+	branch(*this, space_vars_Y, INT_VAR_SIZE_MIN(), INT_VAL_MIN());	
+	branch(*this, space_vars_X, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	branch(*this, time_vars, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	branch(*this, kine_vars_L, INT_VAR_SIZE_MIN(), INT_VAL_MIN());
+	branch(*this, kine_vars_R, INT_VAR_SIZE_MIN(), INT_VAL_MIN());	
+    };
+
+    ComplexSequentialProblemXY(ComplexSequentialProblemXY &s)
+	: Space(s)
+    {
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    complex_Obj_x[i].update(*this, s.complex_Obj_x[i]);	
+	    complex_Obj_y[i].update(*this, s.complex_Obj_y[i]);
+	    complex_Obj_t[i].update(*this, s.complex_Obj_t[i]);
+	    
+	    gantry_left_y[i].update(*this, s.gantry_left_y[i]);
+	    gantry_right_y[i].update(*this, s.gantry_right_y[i]);
+	}
+    }
+
+    virtual Space* copy(void) {
+	return new ComplexSequentialProblemXY(*this);
+    };
+
+    void print(void) const
+    {
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{	
+	    printf("Position object: x:%d, y:%d, t:%d (w:%d, h:%d, d:%d)\n",
+		   complex_Obj_x[i].val(),
+		   complex_Obj_y[i].val(),
+		   complex_Obj_t[i].val(),
+		   complex_Obj_widths[i],
+		   complex_Obj_heights[i],
+		   complex_Obj_durations[i]);
+	}
+	
+	for (int i = 0; i < complex_Obj_count; ++i)
+	{
+	    if (complex_Obj_durations[i] >= complex_height_threshold)
+	    {
+		printf("Gantry position (%d): left_y:%d right_y:%d\n", i,
+		       gantry_left_y[i].val(),
+		       gantry_right_y[i].val());
+	    }
+	}
+    };
+};
+
+
+void test_arrangement_2(void)
+{ 
+    printf("Testing sheet arrangement 2 ...\n");
+
+    SimpleProblem *simple_problem = new SimpleProblem();
+    DFS<SimpleProblem> engine(simple_problem);
+    delete simple_problem;
+
+    while (SimpleProblem *simple_P = engine.next())	
+    {
+	simple_P->print();
+	delete simple_P;
+    }
+    Search::Statistics stat = engine.statistics();
+    printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);
+       
+    printf("Testing sheet arrangement 2 ... finished\n");
+}
+
+
+void test_arrangement_3(void)
+{ 
+    printf("Testing sheet arrangement 3 ...\n");
+
+    ArrangementProblem *arrangement_problem = new ArrangementProblem();
+    DFS<ArrangementProblem> engine(arrangement_problem);
+    delete arrangement_problem;
+
+    while (ArrangementProblem *arrangement_P = engine.next())	
+    {
+	arrangement_P->print();
+	delete arrangement_P;	
+	printf("\n");
+	getchar();
+    }
+    Search::Statistics stat = engine.statistics();
+    printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);
+       
+    printf("Testing sheet arrangement 3 ... finished\n");
+}
+
+
+void test_arrangement_4(void)
+{ 
+    printf("Testing sheet arrangement 4 ...\n");
+
+    SimpleSequentialProblem *sequential_problem = new SimpleSequentialProblem();
+    DFS<SimpleSequentialProblem> engine(sequential_problem);
+    delete sequential_problem;
+
+    while (SimpleSequentialProblem *sequential_P = engine.next())	
+    {
+	sequential_P->print();
+	delete sequential_P;
+
+	Search::Statistics stat = engine.statistics();
+	printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);	
+	printf("\n");
+	getchar();
+    }
+       
+    printf("Testing sheet arrangement 4 ... finished\n");
+}
+
+
+void test_arrangement_5(void)
+{ 
+    printf("Testing sheet arrangement 5 ...\n");
+    generate_random_complex_objects();
+
+    ComplexSequentialProblem *sequential_problem = new ComplexSequentialProblem();
+    Search::Options options;
+    options.cutoff = Search::Cutoff::linear();
+    options.nogoods_limit = 512;
+    DFS<ComplexSequentialProblem> engine(sequential_problem, options);
+    delete sequential_problem;
+
+    clock_t begin = clock();
+
+    while (ComplexSequentialProblem *sequential_P = engine.next())	
+    {
+	sequential_P->print();
+	clock_t end = clock();
+	printf("Time (CPU): %.3fs\n", (end - begin) / (double)CLOCKS_PER_SEC);
+	
+	delete sequential_P;
+
+	Search::Statistics stat = engine.statistics();
+	printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);	
+	printf("\n");
+	getchar();
+    }
+    clock_t end = clock();
+    printf("Time (CPU): %.3fs\n", (end - begin) / (double)CLOCKS_PER_SEC);    
+       
+    printf("Testing sheet arrangement 5 ... finished\n");
+}
+
+
+void test_arrangement_6(void)
+{ 
+    printf("Testing sheet arrangement 6 ...\n");
+    generate_random_complex_objects();
+
+    complex_sheet_resolution = complex_sheet_resolution_max;
+    
+    while (complex_sheet_resolution > complex_sheet_resolution_min)
+    {
+	printf("Trying sheet resolution = %d\n", complex_sheet_resolution);
+	
+	ComplexSequentialProblem *sequential_problem = new ComplexSequentialProblem();
+	
+	Search::Options options;
+	/*
+	options.cutoff = Search::Cutoff::linear();
+	options.nogoods_limit = 16 * 512;
+	*/
+	options.stop = Search::Stop::time(512);	
+	
+	DFS<ComplexSequentialProblem> engine(sequential_problem, options);	
+	delete sequential_problem;
+	
+	clock_t begin = clock();
+
+	ComplexSequentialProblem *sequential_P = engine.next();
+	    
+	if (sequential_P != NULL)
+	{
+	    sequential_P->print();
+	    clock_t end = clock();
+	    printf("Time (CPU): %.3fs\n", (end - begin) / (double)CLOCKS_PER_SEC);	   
+	    
+	    Search::Statistics stat = engine.statistics();
+	    printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);	
+	    printf("\n");
+	    printf("SUCCESS\n");
+	}
+	else
+	{
+	    clock_t end = clock();
+	    printf("Time (CPU): %.3fs\n", (end - begin) / (double)CLOCKS_PER_SEC);
+
+	    Search::Statistics stat = engine.statistics();
+	    printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);	
+
+	    printf("FAIL\n");
+	}
+	delete sequential_P;	
+	
+	complex_sheet_resolution -= 1;
+	
+    }       
+    printf("Testing sheet arrangement 6 ... finished\n");
+}
+
+
+void test_arrangement_7(void)
+{ 
+    printf("Testing sheet arrangement 7 ...\n");
+    generate_random_complex_objects();    
+
+    complex_sheet_resolution_X = complex_sheet_resolution_X_max;
+    
+    while (complex_sheet_resolution_X > complex_sheet_resolution_X_min)
+    {
+	printf("Trying sheet resolution X = %d, Y = %d\n", complex_sheet_resolution_X, complex_sheet_resolution_Y);
+	
+	ComplexSequentialProblemXY *sequential_problem = new ComplexSequentialProblemXY();
+	Search::Options options;
+	/*
+	options.cutoff = Search::Cutoff::linear();
+	options.nogoods_limit = 16 * 512;
+	*/
+	options.stop = Search::Stop::time(10 * 512);
+	
+	DFS<ComplexSequentialProblemXY> engine(sequential_problem, options);
+	delete sequential_problem;
+	
+	clock_t begin = clock();
+	
+	ComplexSequentialProblemXY *sequential_P = engine.next();
+	
+	if (sequential_P != NULL)
+	{
+	    sequential_P->print();
+	    
+	    clock_t end = clock();
+	    printf("Time (CPU): %.3fs\n", (end - begin) / (double)CLOCKS_PER_SEC);	   
+	    
+	    Search::Statistics stat = engine.statistics();
+	    printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);	
+	    printf("SUCCESS\n");
+	}
+	else
+	{
+	    clock_t end = clock();
+	    printf("Time (CPU): %.3fs\n", (end - begin) / (double)CLOCKS_PER_SEC);
+	    Search::Statistics stat = engine.statistics();
+	    printf("Statistics: %ld, %ld, %ld, %ld, %ld\n", stat.fail, stat.node, stat.depth, stat.restart, stat.nogood);
+	    
+	    printf("FAIL\n");
+	}
+	delete sequential_P;	
+	
+	complex_sheet_resolution_X -= 1;
+	
+    }       
+    printf("Testing sheet arrangement 7 ... finished\n");
+}
+
+
+
+/*----------------------------------------------------------------*/
+
+int main(int UNUSED(argc), char **UNUSED(argv))
+{
+//    test_arrangement_1();
+//    test_arrangement_2();
+//    test_arrangement_3();
+//    test_arrangement_4();
+//    test_arrangement_5();
+//    test_arrangement_6();
+    test_arrangement_7();    
+    
+    return 0;
+}
+
diff --git a/src/libseqarrange/test/seq_test_arrangement.hpp b/src/libseqarrange/test/seq_test_arrangement.hpp
new file mode 100644
index 0000000000..005b778ddd
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_arrangement.hpp
@@ -0,0 +1,44 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_arrangement.hpp
+ *
+ * Basic steel sheet object  arrangement test via
+ * Constraint Programming tools.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_TEST_ARRANGEMENT_HPP__
+#define __SEQ_TEST_ARRANGEMENT_HPP__
+
+/*----------------------------------------------------------------*/
+
+/* Plate arrangment test 1 */
+void test_arrangement_1(void);
+
+/* Plate arrangment test 2 */
+void test_arrangement_2(void);
+
+/* Plate arrangment test 3 */
+void test_arrangement_3(void);
+
+/* Plate arrangment test 4 */
+void test_arrangement_4(void);
+
+/* Plate arrangment test 5 */
+void test_arrangement_5(void);
+
+/* Plate arrangment test 6 */
+void test_arrangement_6(void);
+
+/* Plate arrangment test 7 */
+void test_arrangement_7(void);
+
+
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_TEST_ARRANGEMENT_HPP__ */
diff --git a/src/libseqarrange/test/seq_test_interface.cpp b/src/libseqarrange/test/seq_test_interface.cpp
new file mode 100644
index 0000000000..0118a30eb1
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_interface.cpp
@@ -0,0 +1,413 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_interface.cpp
+ *
+ * Tests of the sequential printing interface for Prusa Slic3r
+ */
+/*================================================================*/
+
+#include <sstream>
+#include <iostream>
+#include <fstream>
+#include <vector>
+
+#include "libslic3r/Polygon.hpp"
+#include "libslic3r/ExPolygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+#include "libslic3r/SVG.hpp"
+
+#include <z3++.h>
+
+#include "seq_interface.hpp"
+#include "seq_utilities.hpp"
+
+#include "seq_test_interface.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+
+using namespace Sequential;
+
+
+/*----------------------------------------------------------------*/
+
+static bool find_and_remove(std::string& src, const std::string& key)
+{
+    size_t pos = src.find(key);
+    if (pos != std::string::npos) {
+        src.erase(pos, key.length());
+        return true;
+    }
+    return false;
+}
+
+/*
+std::vector<ObjectToPrint> load_exported_data(const std::string& filename)
+{
+    std::vector<ObjectToPrint> objects_to_print;
+
+    std::ifstream in(filename);
+    if (!in)
+        throw std::runtime_error("NO EXPORTED FILE WAS FOUND");
+    std::string line;
+
+    while (in) {        
+        std::getline(in, line);
+        if (find_and_remove(line, "OBJECT_ID")) {
+            objects_to_print.push_back(ObjectToPrint());
+            objects_to_print.back().id = std::stoi(line);
+        }
+        if (find_and_remove(line, "TOTAL_HEIGHT"))
+            objects_to_print.back().total_height = std::stoi(line);
+        if (find_and_remove(line, "POLYGON_AT_HEIGHT"))
+            objects_to_print.back().pgns_at_height.emplace_back(std::make_pair(std::stoi(line), Polygon()));
+        if (find_and_remove(line, "POINT")) {
+            std::stringstream ss(line);
+            std::string val;
+            ss >> val;
+            Point pt(std::stoi(val), 0);
+            ss >> val;
+            pt.y() = std::stoi(val);
+            objects_to_print.back().pgns_at_height.back().second.append(pt);
+        }
+    }
+    return objects_to_print;
+}
+*/
+
+
+void save_import_data(const std::string           &filename,
+		      const std::map<double, int> &scheduled_polygons,
+		      const map<int, int>         &original_index_map,
+		      const vector<Rational>      &poly_positions_X,
+		      const vector<Rational>      &poly_positions_Y)
+{
+    std::ofstream out(filename);
+    if (!out)
+        throw std::runtime_error("CANNOT CREATE IMPORT FILE");
+
+    for (const auto& scheduled_polygon: scheduled_polygons)
+    {
+	coord_t X, Y;
+
+	scaleUp_PositionForSlicer(poly_positions_X[scheduled_polygon.second],
+				  poly_positions_Y[scheduled_polygon.second],
+				  X,
+				  Y);
+	const auto& original_index = original_index_map.find(scheduled_polygon.second);
+	    
+//	out << original_index_map[scheduled_polygon.second] << " " << X << " " << Y << endl;
+	out << original_index->second << " " << X << " " << Y << endl;	    
+    }
+}
+
+
+/*----------------------------------------------------------------*/
+
+void test_interface_1(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing interface 1 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+    solver_configuration.decimation_precision = SEQ_DECIMATION_PRECISION_HIGH;
+
+    printf("Loading objects ...\n");
+    std::vector<ObjectToPrint> objects_to_print = load_exported_data("arrange_data_export.txt");
+
+    std::vector<ScheduledPlate> scheduled_plates;
+    printf("Scheduling objects for sequential print ...\n");    
+    int result = schedule_ObjectsForSequentialPrint(solver_configuration,
+						    objects_to_print,
+						    scheduled_plates);
+
+    if (result == 0)
+    {
+	printf("Object scheduling for sequential print SUCCESSFUL !\n");
+
+	printf("Number of plates: %ld\n", scheduled_plates.size());
+
+	for (int plate = 0; plate < scheduled_plates.size(); ++plate)
+	{
+	    printf("  Number of objects on plate: %ld\n", scheduled_plates[plate].scheduled_objects.size());
+
+	    for (const auto& scheduled_object: scheduled_plates[plate].scheduled_objects)
+	    {
+		cout << "    ID: " << scheduled_object.id << "  X: " << scheduled_object.x << "  Y: " << scheduled_object.y << endl;	    
+	    }
+	}
+    }
+    else
+    {
+	printf("Something went WRONG during sequential scheduling (code: %d)\n", result);
+    }      
+    
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing interface 1 ... finished\n");    
+}
+
+
+void test_interface_2(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing interface 2 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+    solver_configuration.decimation_precision = SEQ_DECIMATION_PRECISION_HIGH;
+
+    printf("Loading objects ...\n");    
+    std::vector<ObjectToPrint> objects_to_print = load_exported_data("arrange_data_export.txt");
+
+    std::vector<std::vector<Slic3r::Polygon> > convex_unreachable_zones;
+    std::vector<std::vector<Slic3r::Polygon> > box_unreachable_zones;    
+
+    printf("Preparing extruder unreachable zones ...\n");
+    setup_ExtruderUnreachableZones(solver_configuration, convex_unreachable_zones, box_unreachable_zones);
+
+    std::vector<ScheduledPlate> scheduled_plates;
+    printf("Scheduling objects for sequential print ...\n");
+
+    int result = schedule_ObjectsForSequentialPrint(solver_configuration,
+						    objects_to_print,
+						    convex_unreachable_zones,
+						    box_unreachable_zones,
+						    scheduled_plates);
+
+    if (result == 0)
+    {
+	printf("Object scheduling for sequential print SUCCESSFUL !\n");
+
+	printf("Number of plates: %ld\n", scheduled_plates.size());
+
+	for (int plate = 0; plate < scheduled_plates.size(); ++plate)
+	{
+	    printf("  Number of objects on plate: %ld\n", scheduled_plates[plate].scheduled_objects.size());
+
+	    for (const auto& scheduled_object: scheduled_plates[plate].scheduled_objects)
+	    {
+		cout << "    ID: " << scheduled_object.id << "  X: " << scheduled_object.x << "  Y: " << scheduled_object.y << endl;	    
+	    }
+	}
+    }
+    else
+    {
+	printf("Something went WRONG during sequential scheduling (code: %d)\n", result);
+    }          
+    
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing interface 2 ... finished\n");    
+}
+
+
+void test_interface_3(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing interface 3 ...\n");
+
+    start = clock();
+    
+    PrinterGeometry printer_geometry;
+    if (load_printer_geometry("printer_geometry.mk4.txt", printer_geometry) != 0)
+    {
+	printf("Printer geometry load error.\n");
+	return;
+    }
+
+    printf("x_size: %d\n", printer_geometry.x_size);
+    printf("y_size: %d\n", printer_geometry.y_size);
+
+    for (const auto& convex_height: printer_geometry.convex_heights)
+    {
+	cout << "convex_height:" << convex_height << endl;
+    }
+
+    for (const auto& box_height: printer_geometry.box_heights)
+    {
+	cout << "box_height:" << box_height << endl;
+    }
+
+    printf("extruder slices:\n");
+    
+    for (std::map<coord_t, std::vector<Polygon> >::const_iterator extruder_slice = printer_geometry.extruder_slices.begin(); extruder_slice != printer_geometry.extruder_slices.end(); ++extruder_slice)
+    {
+	for (const auto &polygon: extruder_slice->second)
+	{
+	    printf("  polygon height: %d\n", extruder_slice->first);
+	    
+	    for (const auto &point: polygon.points)
+	    {
+		cout << "    " << point.x() << "  " << point.y() << endl;
+	    }
+	}
+    }
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing interface 3 ... finished\n");    
+}    
+
+
+int test_interface_4(void)
+{
+    clock_t start, finish;
+    
+    printf("Testing interface 4 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+    solver_configuration.decimation_precision = SEQ_DECIMATION_PRECISION_HIGH;
+    solver_configuration.object_group_size = 4;
+
+    printf("Loading objects ...\n");    
+    std::vector<ObjectToPrint> objects_to_print = load_exported_data("arrange_data_export.txt");
+    printf("Loading objects ... finished\n");
+
+    PrinterGeometry printer_geometry;
+
+    printf("Loading printer geometry ...\n");
+    int result = load_printer_geometry("../printers/printer_geometry.mk4.compatibility.txt", printer_geometry);
+
+    if (result != 0)
+    {
+	printf("Cannot load printer geometry (code: %d).\n", result);
+	return result;
+    }
+    solver_configuration.setup(printer_geometry);
+    printf("Loading printer geometry ... finished\n");
+    
+    std::vector<ScheduledPlate> scheduled_plates;
+    printf("Scheduling objects for sequential print ...\n");
+
+    scheduled_plates = schedule_ObjectsForSequentialPrint(solver_configuration,
+							  printer_geometry,
+							  objects_to_print);
+
+    printf("Object scheduling for sequential print SUCCESSFUL !\n");
+    
+    printf("Number of plates: %ld\n", scheduled_plates.size());
+
+    for (int plate = 0; plate < scheduled_plates.size(); ++plate)
+    {
+	printf("  Number of objects on plate: %ld\n", scheduled_plates[plate].scheduled_objects.size());
+	
+	for (const auto& scheduled_object: scheduled_plates[plate].scheduled_objects)
+	{
+	    cout << "    ID: " << scheduled_object.id << "  X: " << scheduled_object.x << "  Y: " << scheduled_object.y << endl;	    
+	}
+    }
+    
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing interface 4 ... finished\n");
+
+    return 0;
+}
+
+
+int test_interface_5(void)
+{
+    clock_t start, finish;
+    
+    printf("Testing interface 5 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+    solver_configuration.decimation_precision = SEQ_DECIMATION_PRECISION_HIGH;
+    solver_configuration.object_group_size = 4;
+
+    printf("Loading objects ...\n");    
+    std::vector<ObjectToPrint> objects_to_print = load_exported_data("arrange_data_export.txt");
+    printf("Loading objects ... finished\n");
+
+    PrinterGeometry printer_geometry;
+
+    printf("Loading printer geometry ...\n");
+    int result = load_printer_geometry("../printers/printer_geometry.mk4.compatibility.txt", printer_geometry);
+
+    if (result != 0)
+    {
+	printf("Cannot load printer geometry (code: %d).\n", result);
+	return result;
+    }
+    solver_configuration.setup(printer_geometry);
+    printf("Loading printer geometry ... finished\n");
+    
+    std::vector<ScheduledPlate> scheduled_plates;
+    printf("Scheduling objects for sequential print ...\n");
+
+    scheduled_plates = schedule_ObjectsForSequentialPrint(solver_configuration,
+							  printer_geometry,
+							  objects_to_print);
+
+    printf("Object scheduling for sequential print SUCCESSFUL !\n");
+    
+    printf("Number of plates: %ld\n", scheduled_plates.size());
+
+    for (int plate = 0; plate < scheduled_plates.size(); ++plate)
+    {
+	printf("  Number of objects on plate: %ld\n", scheduled_plates[plate].scheduled_objects.size());
+	
+	for (const auto& scheduled_object: scheduled_plates[plate].scheduled_objects)
+	{
+	    cout << "    ID: " << scheduled_object.id << "  X: " << scheduled_object.x << "  Y: " << scheduled_object.y << endl;	    
+	}
+    }
+    
+    finish = clock();    
+    printf("Solving time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+
+    start = clock();
+    
+    printf("Checking sequential printability ...\n");
+
+    bool printable = check_ScheduledObjectsForSequentialPrintability(solver_configuration,
+								     printer_geometry,
+								     objects_to_print,
+								     scheduled_plates);
+    
+    printf("  Scheduled/arranged objects are sequentially printable: %s\n", (printable ? "YES" : "NO"));
+
+    printf("Checking sequential printability ... finished\n");
+
+    finish = clock();   
+    printf("Checking time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);    
+    
+    printf("Testing interface 5 ... finished\n");
+
+    return 0;
+}
+
+
+/*----------------------------------------------------------------*/
+
+int main(int SEQ_UNUSED(argc), char **SEQ_UNUSED(argv))
+{
+//    test_interface_1();
+//    test_interface_2();
+//    test_interface_3();
+//    test_interface_4();
+    test_interface_5();        
+    
+    return 0;
+}
+
+
diff --git a/src/libseqarrange/test/seq_test_interface.hpp b/src/libseqarrange/test/seq_test_interface.hpp
new file mode 100644
index 0000000000..de92e28f01
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_interface.hpp
@@ -0,0 +1,35 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_interface.hpp
+ *
+ * Tests of the sequential printing interface for Prusa Slic3r
+ */
+/*================================================================*/
+
+#ifndef __SEQ_TEST_INTERFACE_HPP__
+#define __SEQ_TEST_INTERFACE_HPP__
+
+/*----------------------------------------------------------------*/
+
+/* Interface test 1 */
+void test_interface_1(void);
+
+/* Interface test 2 */
+void test_interface_2(void);
+
+/* Interface test 3 */
+void test_interface_3(void);
+
+/* Interface test 4 */
+int test_interface_4(void);
+
+/* Interface test 5 */
+int test_interface_5(void);
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_TEST_PREPROCESS_HPP__ */
diff --git a/src/libseqarrange/test/seq_test_polygon.cpp b/src/libseqarrange/test/seq_test_polygon.cpp
new file mode 100644
index 0000000000..e8852d2696
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_polygon.cpp
@@ -0,0 +1,3054 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_polygon.cpp
+ *
+ * Basic polygon tests.
+ */
+/*================================================================*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include <vector>
+#include "libslic3r/ExPolygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+#include "libslic3r/SVG.hpp"
+
+#include <z3++.h>
+
+#include "prusaparts.hpp"
+
+#include "seq_defs.hpp"
+
+#include "seq_sequential.hpp"
+#include "seq_preprocess.hpp"
+
+#include "seq_test_polygon.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+using namespace Slic3r;
+using namespace Slic3r::Geometry;
+
+using namespace z3;
+
+using namespace Sequential;
+
+#define SCALE_FACTOR 100000
+
+
+/*----------------------------------------------------------------*/
+
+
+void test_polygon_1(void)
+{ 
+    printf("Testing polygon 1 ...\n");
+
+    Polygon polygon_1 = {{-1000000, -1000000}, {1000000, -1000000}, {1000000, 1000000}, {-1000000, 1000000} };
+
+    for (int i = 0; i < polygon_1.size(); ++i)
+    {
+	Point point = polygon_1[i];
+	printf("%d,%d\n", point.x(), point.y());
+    }
+    
+    printf("Testing polygon 1 ... finished\n");
+}
+
+
+void test_polygon_2(void)
+{ 
+    printf("Testing polygon 2 ...\n");
+
+    for (int k = 0; k < PRUSA_PART_POLYGONS.size(); ++k)
+    {
+	printf("k = %d\n", k);
+	
+	const Polygon &polygon_1 = PRUSA_PART_POLYGONS[k];
+	Polygon hull_1 = convex_hull(polygon_1);
+	
+	for (int i = 0; i < polygon_1.size(); ++i)
+	{
+	    const Point &point = polygon_1[i];
+	    printf("poly %d: %d,%d\n", i, point.x(), point.y());
+	}
+	printf("\n");
+	
+	for (int i = 0; i < hull_1.size(); ++i)
+	{
+	    const Point &point = hull_1[i];
+	    printf("hull %d: %d,%d\n", i, point.x(), point.y());
+	}
+
+	if (hull_1.size() >= 2)
+	{
+	    const Point &point_1 = hull_1[0];
+	    const Point &point_2 = hull_1[1];
+
+	    Point v = (point_2 - point_1); //.normalized();
+	    printf("v: %d,%d\n", v.x(), v.y());
+	    cout << v << endl;
+	    
+	    Point u = v.normalized();	    
+	    printf("u: %d,%d\n", u.x(), u.y());
+	    cout << u << endl;
+
+	    printf("Ortho:\n");
+	    Point n(v.y(), -v.x());
+	    cout << n << endl;
+
+	    coord_t d = n.x() * point_1.x() + n.y() * point_1.y();
+	    printf("%d\n", d);
+	    cout << d << endl;
+
+	    auto is_inside=[&](const Point &p)
+	    {
+		coord_t d1 = n.x() * p.x() + n.y() * p.y() - d;
+		printf("d1: %d\n", d1);
+
+		if (d1 >= 0)
+		{
+		    return true;
+		}
+		else
+		{
+		    return false;
+		}
+	    };
+	    
+	    bool ins1 = is_inside(point_1);
+	    printf("%s\n", ins1 ? "yes" : "no");
+	    bool ins2 = is_inside(point_2);
+	    printf("%s\n", ins2 ? "yes" : "no");	    
+	    bool ins3 = is_inside(point_1 + point_2);
+	    printf("%s\n", ins3 ? "yes" : "no");	    
+	    bool ins4 = is_inside(point_1 - point_2);
+	    printf("%s\n", ins4 ? "yes" : "no");	    
+	}	
+	
+	getchar();
+    }
+    
+    printf("Testing polygon 2 ... finished\n");
+}
+
+
+int line_count = 4;
+Line lines[] = {{Point(100,100), Point(200,200)}, {Point(200,100), Point(100,200)}, {Point(0,0), Point(100,10)}, {Point(50,0), Point(60,100)} };
+
+void test_polygon_3(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 3 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T_parameters(z_context);    
+    
+    for (int i = 0; i < line_count; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < line_count; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < line_count; ++i)
+    {
+	string name = "t_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T_parameters.push_back(expr(z_context.real_const(name.c_str())));
+    }    
+    
+    z3::solver z_solver(z_context);
+
+    introduce_LineNonIntersection_explicit(z_solver,
+					   z_context,
+					   X_positions[0],
+					   Y_positions[0],
+					   T_parameters[0],
+					   lines[0],
+					   X_positions[1],
+					   Y_positions[1],
+					   T_parameters[1],
+					   lines[1]);
+
+    introduce_LineNonIntersection_explicit(z_solver,
+					   z_context,
+					   X_positions[2],
+					   Y_positions[2],
+					   T_parameters[2],
+					   lines[2],
+					   X_positions[3],
+					   Y_positions[3],
+					   T_parameters[3],
+					   lines[3]);    
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	return;
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }   
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+
+    finish = clock();    
+
+    printf("Printing interpretation:\n");    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s  ", z_model[i].name().str().c_str());
+	
+	cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+	double value = z_model.get_const_interp(z_model[i]).as_double();
+	
+	printf("value: %.3f\n", value);
+	
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 3 ... finished\n");    
+}
+
+
+void test_polygon_4(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 4 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T_parameters(z_context);    
+    
+    for (int i = 0; i < line_count; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < line_count; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < line_count; ++i)
+    {
+	string name = "t_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T_parameters.push_back(expr(z_context.real_const(name.c_str())));
+    }    
+    
+    z3::solver z_solver(z_context);
+
+    introduce_LineNonIntersection_implicit(z_solver,
+					   z_context,
+					   X_positions[0],
+					   Y_positions[0],
+					   T_parameters[0],
+					   lines[0],
+					   X_positions[1],
+					   Y_positions[1],
+					   T_parameters[1],
+					   lines[1]);
+
+    introduce_LineNonIntersection_implicit(z_solver,
+					   z_context,
+					   X_positions[2],
+					   Y_positions[2],
+					   T_parameters[2],
+					   lines[2],
+					   X_positions[3],
+					   Y_positions[3],
+					   T_parameters[3],
+					   lines[3]);    
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	return;
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }   
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+
+    finish = clock();    
+
+    printf("Printing interpretation:\n");    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s  ", z_model[i].name().str().c_str());
+	
+	cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+	double value = z_model.get_const_interp(z_model[i]).as_double();
+	
+	printf("value: %.3f\n", value);
+	
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 4 ... finished\n");    
+}
+
+
+int poly_line_count = 4;
+Line poly_lines[] = {{Point(100,100), Point(200,100)}, {Point(200,100), Point(200,200)}, {Point(200,200), Point(100,200)}, {Point(100,200), Point(100,100)} };
+
+
+void test_polygon_5(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 5 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    
+    for (int i = 0; i < poly_line_count; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < poly_line_count; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+    
+    z3::solver z_solver(z_context);
+
+    introduce_PointInsideHalfPlane(z_solver,
+				   X_positions[0],
+				   Y_positions[0],
+				   X_positions[1],
+				   Y_positions[1],
+				   poly_lines[0]);
+
+    introduce_PointInsideHalfPlane(z_solver,
+				   X_positions[0],
+				   Y_positions[0],
+				   X_positions[1],
+				   Y_positions[1],
+				   poly_lines[1]);
+
+    introduce_PointInsideHalfPlane(z_solver,
+				   X_positions[0],
+				   Y_positions[0],
+				   X_positions[1],
+				   Y_positions[1],
+				   poly_lines[2]);
+
+    introduce_PointInsideHalfPlane(z_solver,
+				   X_positions[0],
+				   Y_positions[0],
+				   X_positions[1],
+				   Y_positions[1],
+				   poly_lines[3]);        
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	return;
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }   
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+
+    finish = clock();    
+
+    printf("Printing interpretation:\n");    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s  ", z_model[i].name().str().c_str());
+	
+	cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+	double value = z_model.get_const_interp(z_model[i]).as_double();
+	
+	printf("value: %.3f\n", value);
+	
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 5 ... finished\n");    
+}
+
+
+Polygon polygon_1 = {{0, 0}, {50, 0}, {50, 50}, {0, 50}};
+//Polygon polygon_1 = {{scale_(0), scale_(0)}, {scale_(50), scale_(0)}, {scale_(50), scale_(50)}, {scale_(0), scale_(50)}};
+
+
+void test_polygon_6(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 6 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    
+    for (int i = 0; i < poly_line_count; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < poly_line_count; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+    
+    z3::solver z_solver(z_context);
+
+    introduce_PointOutsidePolygon(z_solver,
+				  z_context,
+				  X_positions[0],
+				  Y_positions[0],
+				  X_positions[1],
+				  Y_positions[1],
+				  polygon_1);
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	return;
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }   
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+
+    finish = clock();    
+
+    printf("Printing interpretation:\n");    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s  ", z_model[i].name().str().c_str());
+	
+	cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+	double value = z_model.get_const_interp(z_model[i]).as_double();
+
+	z3::expr valo_1 = z_model.get_const_interp(z_model[i]);
+	z3::expr deco_1 = expr(z_context.real_const("deco_1"));
+
+	z3::expr lino_1 = (valo_1 * deco_1 == 0);
+	
+	printf("value: %.3f\n", value);
+	
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 6 ... finished\n");    
+}
+
+
+Polygon polygon_2 = {{0, 0}, {150, 0}, {150, 50}, {75, 120}, {0, 50} };
+//Polygon polygon_2 = {{scale_(0), scale_(0)}, {scale_(150), scale_(0)}, {scale_(150), scale_(50)}, {scale_(75), scale_(120)}, {scale_(0), scale_(50)} };
+
+
+void test_polygon_7(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 7 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T1_parameters(z_context);
+    z3::expr_vector T2_parameters(z_context);    
+    
+    for (int i = 0; i < 2; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < 2; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < polygon_1.points.size(); ++i)
+    {
+	string name = "t1_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T1_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_2.points.size(); ++i)
+    {
+	string name = "t2_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T2_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }        
+    
+    z3::solver z_solver(z_context);
+
+   introduce_DecisionBox(z_solver, X_positions[0], Y_positions[0], 200, 200);
+   introduce_DecisionBox(z_solver, X_positions[1], Y_positions[1], 200, 200);    
+
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[0],
+				    Y_positions[0],
+				    polygon_1,
+				    X_positions[1],
+				    Y_positions[1],				    
+				    polygon_2);
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	return;
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }   
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+
+    finish = clock();    
+
+    double poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y;
+    
+    printf("Printing interpretation:\n");    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s  ", z_model[i].name().str().c_str());
+	
+	cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+	double value = z_model.get_const_interp(z_model[i]).as_double();
+	printf("value: %.3f\n", value);	
+
+	if (z_model[i].name().str() == "x_pos-0")
+	{
+	    poly_1_pos_x = value;
+	}
+	else if (z_model[i].name().str() == "y_pos-0")
+	{
+	    poly_1_pos_y = value;
+	}
+	else if (z_model[i].name().str() == "x_pos-1")
+	{
+	    poly_2_pos_x = value;
+	}
+	else if (z_model[i].name().str() == "y_pos-1")
+	{
+	    poly_2_pos_y = value;
+	}	
+	
+	
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+
+    printf("Positions: %.3f, %.3f, %.3f, %.3f\n", poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y);
+
+    /*
+    for (int i = 0; i < 2; ++i)
+    {	
+	double value = X_positions[i].as_double();
+	printf("Orig X: %.3f\n", value);
+
+	value = Y_positions[i].as_double();
+	printf("Orig Y: %.3f\n", value);	
+    }
+    */
+    
+    SVG preview_svg("polygon_test_7.svg");
+
+//    preview_svg.draw(polygon_1);
+//    preview_svg.draw(polygon_2);
+    
+    preview_svg.Close();    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 7 ... finished\n");    
+}
+
+
+Polygon scale_UP(const Polygon &polygon)
+{
+    Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {
+	poly.points[i] = Point(poly.points[i].x() * SCALE_FACTOR, poly.points[i].y() * SCALE_FACTOR);
+    }
+
+    return poly;
+}
+
+
+Polygon scale_UP(const Polygon &polygon, double x_pos, double y_pos)
+{
+    Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {
+	poly.points[i] = Point(poly.points[i].x() * SCALE_FACTOR + x_pos * SCALE_FACTOR, poly.points[i].y() * SCALE_FACTOR + y_pos * SCALE_FACTOR);
+    }
+
+    return poly;    
+}
+
+
+Polygon polygon_3 = {{40, 0}, {80, 40}, {40, 80}, {0, 40}};
+//Polygon polygon_3 = {{20, 0}, {40, 0}, {60, 30}, {30, 50}, {0, 30}};
+
+void test_polygon_8(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 8 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T1_parameters(z_context);
+    z3::expr_vector T2_parameters(z_context);
+    z3::expr_vector T3_parameters(z_context);        
+    
+    for (int i = 0; i < 3; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < 3; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < polygon_1.points.size(); ++i)
+    {
+	string name = "t1_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T1_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_2.points.size(); ++i)
+    {
+	string name = "t2_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T2_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_3.points.size(); ++i)
+    {
+	string name = "t3_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T3_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }            
+    
+    z3::solver z_solver(z_context);
+
+    /*
+    introduce_DecisionBox(z_solver, X_positions[0], Y_positions[0], 200, 200);
+    introduce_DecisionBox(z_solver, X_positions[1], Y_positions[1], 200, 200);    
+    */
+
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[0],
+				    Y_positions[0],
+				    polygon_1,
+				    X_positions[1],
+				    Y_positions[1],				    
+				    polygon_2);
+
+    /*
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[1],
+				    Y_positions[1],
+				    polygon_2,
+				    X_positions[0],
+				    Y_positions[0],				    
+				    polygon_1);    
+    */
+
+    introduce_PolygonLineNonIntersection(z_solver,
+					 z_context,
+					 X_positions[0],
+					 Y_positions[0],
+					 polygon_1,
+					 X_positions[1],
+					 Y_positions[1],
+					 polygon_2);
+    
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[1],
+				    Y_positions[1],
+				    polygon_2,
+				    X_positions[2],
+				    Y_positions[2],				    
+				    polygon_3);
+
+    /*
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[2],
+				    Y_positions[2],
+				    polygon_3,
+				    X_positions[1],
+				    Y_positions[1],				    
+				    polygon_2);
+    */
+
+    introduce_PolygonLineNonIntersection(z_solver,
+					 z_context,
+					 X_positions[1],
+					 Y_positions[1],
+					 polygon_2,
+					 X_positions[2],
+					 Y_positions[2],
+					 polygon_3);
+
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[0],
+				    Y_positions[0],
+				    polygon_1,
+				    X_positions[2],
+				    Y_positions[2],				    
+				    polygon_3);
+
+/*
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[2],
+				    Y_positions[2],
+				    polygon_3,
+				    X_positions[0],
+				    Y_positions[0],				    
+				    polygon_1);
+*/
+
+    introduce_PolygonLineNonIntersection(z_solver,
+					 z_context,
+					 X_positions[0],
+					 Y_positions[0],
+					 polygon_1,
+					 X_positions[2],
+					 Y_positions[2],
+					 polygon_3);	
+
+  
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    int last_solvable_decision_box_size = -1;
+    double poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y;
+    
+    for (int decision_box_size = 300; decision_box_size > 10; decision_box_size -= 4)
+    {
+	z3::expr_vector decision_box_assumptions(z_context);
+	
+	assume_DecisionBox(X_positions[0], Y_positions[0], decision_box_size, decision_box_size, decision_box_assumptions);
+	assume_DecisionBox(X_positions[1], Y_positions[1], decision_box_size, decision_box_size, decision_box_assumptions);
+	assume_DecisionBox(X_positions[2], Y_positions[2], decision_box_size, decision_box_size, decision_box_assumptions);	
+
+	bool sat = false;
+	
+	switch (z_solver.check(decision_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    printf("  SATISFIABLE\n");
+	    last_solvable_decision_box_size = decision_box_size;
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    printf("  UNSATISFIABLE\n");
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    printf("  UNKNOWN\n");
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+
+	if (sat)
+	{
+	    z3::model z_model(z_solver.get_model());
+	    printf("Printing model:\n");
+	    cout << z_model << "\n";
+    
+	    printf("Printing interpretation:\n");    
+	    for (int i = 0; i < z_model.size(); ++i)
+	    {
+		printf("Variable:%s  ", z_model[i].name().str().c_str());
+		
+		cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+		double value = z_model.get_const_interp(z_model[i]).as_double();
+		printf("value: %.3f\n", value);	
+	    
+		if (z_model[i].name().str() == "x_pos-0")
+		{
+		    poly_1_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-0")
+		{
+		    poly_1_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-1")
+		{
+		    poly_2_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-1")
+		{
+		    poly_2_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-2")
+		{
+		    poly_3_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-2")
+		{
+		    poly_3_pos_y = value;
+		}		
+	    }
+	}
+	else
+	{
+	    break;
+	}
+		
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+    finish = clock();
+
+    printf("Solvable decision box: %d\n", last_solvable_decision_box_size);
+    printf("Positions: %.3f, %.3f, %.3f, %.3f, %.3f, %.3f\n", poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y);
+
+    /*
+    for (int i = 0; i < 2; ++i)
+    {	
+	double value = X_positions[i].as_double();
+	printf("Orig X: %.3f\n", value);
+
+	value = Y_positions[i].as_double();
+	printf("Orig Y: %.3f\n", value);	
+    }
+    */
+    
+    SVG preview_svg("polygon_test_8.svg");
+
+    Polygon display_polygon_1 = scale_UP(polygon_1, poly_1_pos_x, poly_1_pos_y);
+    Polygon display_polygon_2 = scale_UP(polygon_2, poly_2_pos_x, poly_2_pos_y);
+    Polygon display_polygon_3 = scale_UP(polygon_3, poly_3_pos_x, poly_3_pos_y);    
+
+    preview_svg.draw(display_polygon_1, "green");
+    preview_svg.draw(display_polygon_2, "blue");
+    preview_svg.draw(display_polygon_3, "red");    
+    
+    preview_svg.Close();    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 8 ... finished\n");    
+}
+
+
+void test_polygon_9(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 9 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T1_parameters(z_context);
+    z3::expr_vector T2_parameters(z_context);
+    z3::expr_vector T3_parameters(z_context);        
+    
+    for (int i = 0; i < 3; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < 3; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < polygon_1.points.size(); ++i)
+    {
+	string name = "t1_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T1_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_2.points.size(); ++i)
+    {
+	string name = "t2_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T2_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_3.points.size(); ++i)
+    {
+	string name = "t3_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T3_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }            
+    
+    z3::solver z_solver(z_context);
+
+    /*
+    introduce_DecisionBox(z_solver, X_positions[0], Y_positions[0], 200, 200);
+    introduce_DecisionBox(z_solver, X_positions[1], Y_positions[1], 200, 200);    
+    */
+
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[0],
+				    Y_positions[0],
+				    polygon_1,
+				    X_positions[1],
+				    Y_positions[1],				    
+				    polygon_2);
+/*
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[1],
+				    Y_positions[1],
+				    polygon_2,
+				    X_positions[0],
+				    Y_positions[0],				    
+				    polygon_1);    
+*/
+
+    introduce_PolygonLineNonIntersection(z_solver,
+					 z_context,
+					 X_positions[0],
+					 Y_positions[0],
+					 polygon_1,
+					 X_positions[1],
+					 Y_positions[1],
+					 polygon_2);
+    
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[1],
+				    Y_positions[1],
+				    polygon_2,
+				    X_positions[2],
+				    Y_positions[2],				    
+				    polygon_3);
+/*
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[2],
+				    Y_positions[2],
+				    polygon_3,
+				    X_positions[1],
+				    Y_positions[1],				    
+				    polygon_2);
+*/
+    introduce_PolygonLineNonIntersection(z_solver,
+					 z_context,
+					 X_positions[1],
+					 Y_positions[1],
+					 polygon_2,
+					 X_positions[2],
+					 Y_positions[2],
+					 polygon_3);
+
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[0],
+				    Y_positions[0],
+				    polygon_1,
+				    X_positions[2],
+				    Y_positions[2],				    
+				    polygon_3);
+/*
+    introduce_PolygonOutsidePolygon(z_solver,
+				    z_context,
+				    X_positions[2],
+				    Y_positions[2],
+				    polygon_3,
+				    X_positions[0],
+				    Y_positions[0],				    
+				    polygon_1);
+*/
+
+    introduce_PolygonLineNonIntersection(z_solver,
+					 z_context,
+					 X_positions[0],
+					 Y_positions[0],
+					 polygon_1,
+					 X_positions[2],
+					 Y_positions[2],
+					 polygon_3);	
+
+  
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    int last_solvable_bounding_box_size = -1;
+    double poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y;
+    
+    for (int bounding_box_size = 300; bounding_box_size > 10; bounding_box_size -= 4)
+    {
+	z3::expr_vector bounding_box_assumptions(z_context);
+	
+	assume_BedBoundingBox(X_positions[0], Y_positions[0], polygon_1, bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[1], Y_positions[1], polygon_2, bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[2], Y_positions[2], polygon_3, bounding_box_size, bounding_box_size, bounding_box_assumptions);	
+
+	bool sat = false;
+	
+	switch (z_solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    printf("  SATISFIABLE\n");
+	    last_solvable_bounding_box_size = bounding_box_size;
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    printf("  UNSATISFIABLE\n");
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    printf("  UNKNOWN\n");
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+
+	if (sat)
+	{
+	    z3::model z_model(z_solver.get_model());
+	    printf("Printing model:\n");
+	    cout << z_model << "\n";
+    
+	    printf("Printing interpretation:\n");    
+	    for (int i = 0; i < z_model.size(); ++i)
+	    {
+		printf("Variable:%s  ", z_model[i].name().str().c_str());
+		
+		cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+		double value = z_model.get_const_interp(z_model[i]).as_double();
+		printf("value: %.3f\n", value);	
+	    
+		if (z_model[i].name().str() == "x_pos-0")
+		{
+		    poly_1_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-0")
+		{
+		    poly_1_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-1")
+		{
+		    poly_2_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-1")
+		{
+		    poly_2_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-2")
+		{
+		    poly_3_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-2")
+		{
+		    poly_3_pos_y = value;
+		}		
+	    }
+	}
+	else
+	{
+	    break;
+	}
+		
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+    finish = clock();
+
+    printf("Solvable bounding box: %d\n", last_solvable_bounding_box_size);
+    printf("Positions: %.3f, %.3f, %.3f, %.3f, %.3f, %.3f\n", poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y);
+
+    /*
+    for (int i = 0; i < 2; ++i)
+    {	
+	double value = X_positions[i].as_double();
+	printf("Orig X: %.3f\n", value);
+
+	value = Y_positions[i].as_double();
+	printf("Orig Y: %.3f\n", value);	
+    }
+    */
+    
+    SVG preview_svg("polygon_test_9.svg");
+
+    Polygon display_polygon_1 = scale_UP(polygon_1, poly_1_pos_x, poly_1_pos_y);
+    Polygon display_polygon_2 = scale_UP(polygon_2, poly_2_pos_x, poly_2_pos_y);
+    Polygon display_polygon_3 = scale_UP(polygon_3, poly_3_pos_x, poly_3_pos_y);    
+
+    preview_svg.draw(display_polygon_1, "green");
+    preview_svg.draw(display_polygon_2, "blue");
+    preview_svg.draw(display_polygon_3, "red");    
+    
+    preview_svg.Close();    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 9 ... finished\n");    
+}
+
+
+Polygon polygon_4 = {{20, 0}, {40, 0}, {60, 30}, {30, 50}, {0, 30}};
+
+void test_polygon_10(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 10 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T1_parameters(z_context);
+    z3::expr_vector T2_parameters(z_context);
+    z3::expr_vector T3_parameters(z_context);
+    z3::expr_vector T4_parameters(z_context);            
+    
+    for (int i = 0; i < 4; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < 4; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < polygon_1.points.size(); ++i)
+    {
+	string name = "t1_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T1_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_2.points.size(); ++i)
+    {
+	string name = "t2_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T2_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_3.points.size(); ++i)
+    {
+	string name = "t3_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T3_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_4.points.size(); ++i)
+    {
+	string name = "t4_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T4_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }                
+    
+    z3::solver z_solver(z_context);
+
+    vector<Polygon> polygons;
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);    
+    
+    /*
+    introduce_DecisionBox(z_solver, X_positions[0], Y_positions[0], 200, 200);
+    introduce_DecisionBox(z_solver, X_positions[1], Y_positions[1], 200, 200);    
+    */
+
+    /*
+    for (int i = 0; i < 3; ++i)
+    {
+	for (int j = i + 1; j < 4; ++j)
+	{	    
+	    introduce_PolygonOutsidePolygon(z_solver,
+					    z_context,
+					    X_positions[i],
+					    Y_positions[i],
+					    polygons[i],
+					    X_positions[j],
+					    Y_positions[j],				    
+					    polygons[j]);
+	}
+    }
+    */
+
+/*
+        introduce_PolygonOutsidePolygon(z_solver,
+					z_context,
+					X_positions[0],
+					Y_positions[0],
+					polygons[0],
+					X_positions[2],
+					Y_positions[2],				    
+					polygons[2]);    
+
+	
+	introduce_PolygonOutsidePolygon(z_solver,
+					z_context,
+					X_positions[0],
+					Y_positions[0],
+					polygons[0],
+					X_positions[1],
+					Y_positions[1],				    
+					polygons[1]);
+	
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[0],
+				       Y_positions[0],
+				       polygons[0],
+				       X_positions[3],
+				       Y_positions[3],				    
+				       polygons[3]);
+       
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[1],
+				       Y_positions[1],
+				       polygons[1],
+				       X_positions[3],
+				       Y_positions[3],				    
+				       polygons[3]);
+       
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[1],
+				       Y_positions[1],
+				       polygons[1],
+				       X_positions[2],
+				       Y_positions[2],				    
+				       polygons[2]);
+
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[2],
+				       Y_positions[2],
+				       polygons[2],
+				       X_positions[3],
+				       Y_positions[3],				    
+				       polygons[3]);       
+*/
+       
+/*
+    introduce_PolygonWeakNonoverlapping(z_solver,
+					z_context,
+					X_positions,
+					Y_positions,
+					polygons);
+*/   
+    introduce_PolygonStrongNonoverlapping(z_solver,
+					  z_context,
+					  X_positions,
+					  Y_positions,
+					  polygons);    
+  
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    int last_solvable_bounding_box_size = -1;
+    double poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y, poly_4_pos_x, poly_4_pos_y;
+   
+    for (int bounding_box_size = 300; bounding_box_size > 10; bounding_box_size -= 4)
+    {
+	z3::expr_vector bounding_box_assumptions(z_context);
+
+	//assume_BedBoundingBox(X_positions, Y_positions, polygons, bounding_box_size, bounding_box_size, bounding_box_assumptions);	
+	assume_BedBoundingBox(X_positions[0], Y_positions[0], polygons[0], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[1], Y_positions[1], polygons[1], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[2], Y_positions[2], polygons[2], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[3], Y_positions[3], polygons[3], bounding_box_size, bounding_box_size, bounding_box_assumptions);		
+	
+	bool sat = false;
+	
+	switch (z_solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    printf("  SATISFIABLE\n");
+	    last_solvable_bounding_box_size = bounding_box_size;
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    printf("  UNSATISFIABLE\n");
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    printf("  UNKNOWN\n");
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+
+	if (sat)
+	{
+	    z3::model z_model(z_solver.get_model());
+	    printf("Printing model:\n");
+	    cout << z_model << "\n";
+    
+	    printf("Printing interpretation:\n");    
+	    for (int i = 0; i < z_model.size(); ++i)
+	    {
+		printf("Variable:%s  ", z_model[i].name().str().c_str());
+		
+		cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+		double value = z_model.get_const_interp(z_model[i]).as_double();
+		printf("value: %.3f\n", value);	
+	    
+		if (z_model[i].name().str() == "x_pos-0")
+		{
+		    poly_1_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-0")
+		{
+		    poly_1_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-1")
+		{
+		    poly_2_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-1")
+		{
+		    poly_2_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-2")
+		{
+		    poly_3_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-2")
+		{
+		    poly_3_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-3")
+		{
+		    poly_4_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-3")
+		{
+		    poly_4_pos_y = value;
+		}				
+	    }
+	}
+	else
+	{
+	    break;
+	}	
+		
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+    finish = clock();
+
+    printf("Solvable bounding box: %d\n", last_solvable_bounding_box_size);
+    printf("Positions: %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f\n", poly_1_pos_x,
+	                                                                  poly_1_pos_y,
+                                                                  	  poly_2_pos_x,
+                                                                  	  poly_2_pos_y,
+                                                                  	  poly_3_pos_x,
+                                                                  	  poly_3_pos_y,
+                                                                  	  poly_4_pos_x,
+                                                                  	  poly_4_pos_y);
+
+    /*
+    for (int i = 0; i < 2; ++i)
+    {	
+	double value = X_positions[i].as_double();
+	printf("Orig X: %.3f\n", value);
+
+	value = Y_positions[i].as_double();
+	printf("Orig Y: %.3f\n", value);	
+    }
+    */
+    
+    SVG preview_svg("polygon_test_10.svg");
+
+    Polygon display_polygon_1 = scale_UP(polygons[0], poly_1_pos_x, poly_1_pos_y);
+    Polygon display_polygon_2 = scale_UP(polygons[1], poly_2_pos_x, poly_2_pos_y);
+    Polygon display_polygon_3 = scale_UP(polygons[2], poly_3_pos_x, poly_3_pos_y);
+    Polygon display_polygon_4 = scale_UP(polygons[3], poly_4_pos_x, poly_4_pos_y);        
+
+    preview_svg.draw(display_polygon_1, "green");
+    preview_svg.draw(display_polygon_2, "blue");
+    preview_svg.draw(display_polygon_3, "red");
+    preview_svg.draw(display_polygon_4, "grey");        
+    
+    preview_svg.Close();    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 10 ... finished\n");    
+}
+
+
+void test_polygon_11(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 11 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T1_parameters(z_context);
+    z3::expr_vector T2_parameters(z_context);
+    z3::expr_vector T3_parameters(z_context);
+    z3::expr_vector T4_parameters(z_context);            
+    
+    for (int i = 0; i < 4; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < 4; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < polygon_1.points.size(); ++i)
+    {
+	string name = "t1_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T1_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_2.points.size(); ++i)
+    {
+	string name = "t2_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T2_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_3.points.size(); ++i)
+    {
+	string name = "t3_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T3_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+
+    for (int i = 0; i < polygon_4.points.size(); ++i)
+    {
+	string name = "t4_par-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T4_parameters.push_back(expr(z_context.real_const(name.c_str())));	
+    }                
+    
+    z3::solver z_solver(z_context);
+
+    vector<Polygon> polygons;
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);    
+    
+    /*
+    introduce_DecisionBox(z_solver, X_positions[0], Y_positions[0], 200, 200);
+    introduce_DecisionBox(z_solver, X_positions[1], Y_positions[1], 200, 200);    
+    */
+
+    /*
+    for (int i = 0; i < 3; ++i)
+    {
+	for (int j = i + 1; j < 4; ++j)
+	{	    
+	    introduce_PolygonOutsidePolygon(z_solver,
+					    z_context,
+					    X_positions[i],
+					    Y_positions[i],
+					    polygons[i],
+					    X_positions[j],
+					    Y_positions[j],				    
+					    polygons[j]);
+	}
+    }
+    */
+
+/*
+        introduce_PolygonOutsidePolygon(z_solver,
+					z_context,
+					X_positions[0],
+					Y_positions[0],
+					polygons[0],
+					X_positions[2],
+					Y_positions[2],				    
+					polygons[2]);    
+
+	
+	introduce_PolygonOutsidePolygon(z_solver,
+					z_context,
+					X_positions[0],
+					Y_positions[0],
+					polygons[0],
+					X_positions[1],
+					Y_positions[1],				    
+					polygons[1]);
+	
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[0],
+				       Y_positions[0],
+				       polygons[0],
+				       X_positions[3],
+				       Y_positions[3],				    
+				       polygons[3]);
+       
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[1],
+				       Y_positions[1],
+				       polygons[1],
+				       X_positions[3],
+				       Y_positions[3],				    
+				       polygons[3]);
+       
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[1],
+				       Y_positions[1],
+				       polygons[1],
+				       X_positions[2],
+				       Y_positions[2],				    
+				       polygons[2]);
+
+       introduce_PolygonOutsidePolygon(z_solver,
+				       z_context,
+				       X_positions[2],
+				       Y_positions[2],
+				       polygons[2],
+				       X_positions[3],
+				       Y_positions[3],				    
+				       polygons[3]);       
+*/
+       
+    introduce_PolygonWeakNonoverlapping(z_solver,
+					z_context,
+					X_positions,
+					Y_positions,
+					polygons);
+  
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    int last_solvable_bounding_box_size = -1;
+    double poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y, poly_4_pos_x, poly_4_pos_y;
+   
+    for (int bounding_box_size = 200; bounding_box_size > 10; bounding_box_size -= 4)
+    {
+	printf("BB: %d\n", bounding_box_size);
+	z3::expr_vector bounding_box_assumptions(z_context);
+
+	//assume_BedBoundingBox(X_positions, Y_positions, polygons, bounding_box_size, bounding_box_size, bounding_box_assumptions);	
+	assume_BedBoundingBox(X_positions[0], Y_positions[0], polygons[0], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[1], Y_positions[1], polygons[1], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[2], Y_positions[2], polygons[2], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[3], Y_positions[3], polygons[3], bounding_box_size, bounding_box_size, bounding_box_assumptions);		
+	
+	bool sat = false;
+	
+	switch (z_solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    printf("  SATISFIABLE\n");
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    printf("  UNSATISFIABLE\n");
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    printf("  UNKNOWN\n");
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+
+	if (sat)
+	{
+	    z3::model z_model(z_solver.get_model());
+	    printf("Printing model:\n");
+	    cout << z_model << "\n";
+    
+	    printf("Printing interpretation:\n");    
+	    for (int i = 0; i < z_model.size(); ++i)
+	    {
+		printf("Variable:%s  ", z_model[i].name().str().c_str());
+		
+		cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+		double value = z_model.get_const_interp(z_model[i]).as_double();
+		printf("value: %.3f\n", value);	
+	    
+		if (z_model[i].name().str() == "x_pos-0")
+		{
+		    poly_1_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-0")
+		{
+		    poly_1_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-1")
+		{
+		    poly_2_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-1")
+		{
+		    poly_2_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-2")
+		{
+		    poly_3_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-2")
+		{
+		    poly_3_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-3")
+		{
+		    poly_4_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-3")
+		{
+		    poly_4_pos_y = value;
+		}				
+	    }
+
+	    printf("preRefined positions: %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f\n", poly_1_pos_x,
+	                                                                  poly_1_pos_y,
+                                                                  	  poly_2_pos_x,
+                                                                  	  poly_2_pos_y,
+                                                                  	  poly_3_pos_x,
+                                                                  	  poly_3_pos_y,
+                                                                  	  poly_4_pos_x,
+                                                                  	  poly_4_pos_y);				    
+
+	    while (true)
+	    {
+		vector<double> dec_values_X;
+		dec_values_X.push_back(poly_1_pos_x);
+		dec_values_X.push_back(poly_2_pos_x);
+		dec_values_X.push_back(poly_3_pos_x);
+		dec_values_X.push_back(poly_4_pos_x);
+	    
+		vector<double> dec_values_Y;
+		dec_values_Y.push_back(poly_1_pos_y);
+		dec_values_Y.push_back(poly_2_pos_y);
+		dec_values_Y.push_back(poly_3_pos_y);
+		dec_values_Y.push_back(poly_4_pos_y);	    
+		
+		bool refined = refine_PolygonWeakNonoverlapping(z_solver,
+								z_context,
+								X_positions,
+								Y_positions,
+								dec_values_X,
+								dec_values_Y,
+								polygons);
+
+		bool refined_sat = false;
+
+		if (refined)
+		{
+		    switch (z_solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {	    
+			printf("  sat\n");
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			printf("  unsat\n");
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			printf("  unknown\n");
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+
+		    if (refined_sat)
+		    {
+			z3::model z_model(z_solver.get_model());			
+			printf("Printing model:\n");
+			cout << z_model << "\n";
+    
+			for (int i = 0; i < z_model.size(); ++i)
+			{
+			    //printf("Variable:%s  ", z_model[i].name().str().c_str());						    
+			    double value = z_model.get_const_interp(z_model[i]).as_double();
+			
+			    if (z_model[i].name().str() == "x_pos-0")
+			    {
+				poly_1_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-0")
+			    {
+				poly_1_pos_y = value;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-1")
+			    {
+				poly_2_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-1")
+			    {
+				poly_2_pos_y = value;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-2")
+			    {
+				poly_3_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-2")
+			    {
+				poly_3_pos_y = value;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-3")
+			    {
+				poly_4_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-3")
+			    {
+				poly_4_pos_y = value;
+			    }
+			}
+			printf("Refined positions: %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f\n", poly_1_pos_x,
+	                                                                  poly_1_pos_y,
+                                                                  	  poly_2_pos_x,
+                                                                  	  poly_2_pos_y,
+                                                                  	  poly_3_pos_x,
+                                                                  	  poly_3_pos_y,
+                                                                  	  poly_4_pos_x,
+                                                                  	  poly_4_pos_y);			
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    last_solvable_bounding_box_size = bounding_box_size;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}	
+		
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+    finish = clock();
+
+    printf("Solvable bounding box: %d\n", last_solvable_bounding_box_size);
+    printf("Positions: %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f, %.3f\n", poly_1_pos_x,
+	                                                                  poly_1_pos_y,
+                                                                  	  poly_2_pos_x,
+                                                                  	  poly_2_pos_y,
+                                                                  	  poly_3_pos_x,
+                                                                  	  poly_3_pos_y,
+                                                                  	  poly_4_pos_x,
+                                                                  	  poly_4_pos_y);
+
+    /*
+    for (int i = 0; i < 2; ++i)
+    {	
+	double value = X_positions[i].as_double();
+	printf("Orig X: %.3f\n", value);
+
+	value = Y_positions[i].as_double();
+	printf("Orig Y: %.3f\n", value);	
+    }
+    */
+    
+    SVG preview_svg("polygon_test_11.svg");
+
+    Polygon display_polygon_1 = scale_UP(polygons[0], poly_1_pos_x, poly_1_pos_y);
+    Polygon display_polygon_2 = scale_UP(polygons[1], poly_2_pos_x, poly_2_pos_y);
+    Polygon display_polygon_3 = scale_UP(polygons[2], poly_3_pos_x, poly_3_pos_y);
+    Polygon display_polygon_4 = scale_UP(polygons[3], poly_4_pos_x, poly_4_pos_y);        
+
+    preview_svg.draw(display_polygon_1, "green");
+    preview_svg.draw(display_polygon_2, "blue");
+    preview_svg.draw(display_polygon_3, "red");
+    preview_svg.draw(display_polygon_4, "grey");        
+    
+    preview_svg.Close();    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 11 ... finished\n");    
+}
+
+
+void test_polygon_12(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 12 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+
+    std::vector<double> X_values;
+    std::vector<double> Y_values;
+    
+    string_map dec_var_names_map;
+       
+    z3::solver z_solver(z_context);
+
+    vector<Polygon> polygons;
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);    
+    
+    build_WeakPolygonNonoverlapping(z_solver, z_context, polygons, X_positions, Y_positions, X_values, Y_values, dec_var_names_map);
+
+    bool optimized = optimize_WeakPolygonNonoverlapping(z_solver,
+							z_context,
+							solver_configuration,
+							X_positions,
+							Y_positions,
+							X_values,
+							Y_values,							
+							dec_var_names_map,
+							polygons);
+
+    finish = clock();
+
+    if (optimized)
+    {
+	printf("Polygon positions:\n");
+	for (int i = 0; i < polygons.size(); ++i)
+	{
+	    printf("  %.3f, %.3f\n", X_values[i], Y_values[i]);
+	}
+    
+	SVG preview_svg("polygon_test_12.svg");
+	
+	for (int i = 0; i < polygons.size(); ++i)
+	{
+	    Polygon display_polygon = scale_UP(polygons[i], X_values[i], Y_values[i]);
+	    
+	    string color;
+	    
+	    switch(i)
+	    {
+	    case 0:
+	    {
+		color = "green";
+		break;
+	    }
+	    case 1:
+	    {
+		color = "blue";
+		break;
+	    }
+	    case 2:
+	    {
+		color = "red";	    
+		break;
+	    }
+	    case 3:
+	    {
+		color = "grey";	    
+		break;
+	    }
+	    case 4:
+	    {
+		color = "cyan";
+		break;
+	    }
+	    case 5:
+	    {
+		color = "magenta";
+		break;
+	    }		
+	    default:
+	    {
+		break;
+	    }
+	    }
+
+	    preview_svg.draw(display_polygon, color);
+	}
+    
+	preview_svg.Close();
+    }
+    else
+    {
+	printf("Polygon optimization FAILED.\n");
+    }
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 12 ... finished\n");    
+}
+
+
+void test_polygon_13(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 13 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+
+    std::vector<double> X_values;
+    std::vector<double> Y_values;
+    
+    string_map dec_var_names_map;
+
+    /*
+    z3::params z_parameters(z_context);
+    z_parameters.set("timeout", 1000);
+    */
+    Z3_global_param_set("timeout", "8000");
+       
+    z3::solver z_solver(z_context);
+
+    vector<Polygon> polygons;
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+    
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);    
+
+    build_WeakPolygonNonoverlapping(z_solver, z_context, polygons, X_positions, Y_positions, X_values, Y_values, dec_var_names_map);
+
+    bool optimized = optimize_WeakPolygonNonoverlapping(z_solver,
+							z_context,
+							solver_configuration,
+							X_positions,
+							Y_positions,
+							X_values,
+							Y_values,							
+							dec_var_names_map,
+							polygons);
+
+    finish = clock();
+
+    if (optimized)
+    {
+	printf("Polygon positions:\n");
+	for (int i = 0; i < polygons.size(); ++i)
+	{
+	    printf("  %.3f, %.3f\n", X_values[i], Y_values[i]);
+	}
+    
+	SVG preview_svg("polygon_test_13.svg");
+	
+	for (int i = 0; i < polygons.size(); ++i)
+	{
+	    Polygon display_polygon = scale_UP(polygons[i], X_values[i], Y_values[i]);
+	    
+	    string color;
+	    
+	    switch(i)
+	    {
+	    case 0:
+	    {
+		color = "green";
+		break;
+	    }
+	    case 1:
+	    {
+		color = "blue";
+		break;
+	    }
+	    case 2:
+	    {
+		color = "red";	    
+		break;
+	    }
+	    case 3:
+	    {
+		color = "grey";	    
+		break;
+	    }
+	    case 4:
+	    {
+		color = "cyan";
+		break;
+	    }
+	    case 5:
+	    {
+		color = "magenta";
+		break;
+	    }
+	    case 6:
+	    {
+		color = "yellow";
+		break;
+	    }
+	    case 7:
+	    {
+		color = "black";
+		break;
+	    }
+	    case 8:
+	    {
+		color = "indigo";
+		break;
+	    }
+	    case 9:
+	    {
+		color = "olive";
+		break;
+	    }
+	    case 10:
+	    {
+		color = "aqua";
+		break;
+	    }
+	    case 11:
+	    {
+		color = "violet";
+		break;
+	    }			    	    	    
+	    default:
+	    {
+		break;
+	    }
+	    }
+
+	    preview_svg.draw(display_polygon, color);
+	}
+    
+	preview_svg.Close();
+    }
+    else
+    {
+	printf("Polygon optimization FAILED.\n");
+    }
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 13 ... finished\n");    
+}
+
+
+void test_polygon_14(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 14 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    vector<Polygon> polygons;
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+    
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);    
+    
+    vector<int> decided;
+    vector<int> undecided;
+
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    poly_positions_X.resize(polygons.size());
+    poly_positions_Y.resize(polygons.size());    
+
+    bool optimized;    
+    {
+	z3::context z_context;    
+	z3::expr_vector X_positions(z_context);
+	z3::expr_vector Y_positions(z_context);
+	
+	vector<Rational> X_values;
+	vector<Rational> Y_values;
+	
+	string_map dec_var_names_map;
+    
+    /*
+    Z3_global_param_set("timeout", "8000");
+    */
+       
+	z3::solver z_solver(z_context);
+	
+	X_values.resize(polygons.size());
+	Y_values.resize(polygons.size());
+	
+	undecided.push_back(0);
+	undecided.push_back(1);
+	undecided.push_back(2);
+	undecided.push_back(3);    
+	
+	build_WeakPolygonNonoverlapping(z_solver,
+					z_context,
+					polygons,
+					X_positions,
+					Y_positions,
+					X_values,
+					Y_values,
+					decided,
+					undecided,				    
+					dec_var_names_map);
+	
+	optimized = optimize_WeakPolygonNonoverlapping(z_solver,
+						       z_context,
+						       solver_configuration,
+						       X_positions,
+						       Y_positions,
+						       X_values,
+						       Y_values,
+						       decided,
+						       undecided,						   
+						       dec_var_names_map,
+						       polygons);
+
+	for (int i = 0; i < undecided.size(); ++i)
+	{
+	    poly_positions_X[undecided[i]] = X_values[undecided[i]];
+	    poly_positions_Y[undecided[i]] = Y_values[undecided[i]];
+	}
+
+	printf("Optimized 1: %d\n", optimized);
+    }
+    
+    {
+	z3::context z_context;    
+	z3::expr_vector X_positions(z_context);
+	z3::expr_vector Y_positions(z_context);
+	
+	vector<Rational> X_values;
+	vector<Rational> Y_values;
+	
+	string_map dec_var_names_map;
+           
+	z3::solver z_solver(z_context);
+	
+	X_values.resize(polygons.size());
+	Y_values.resize(polygons.size());
+
+	decided.push_back(0);
+	decided.push_back(1);
+	decided.push_back(2);
+	decided.push_back(3);	
+	
+	for (int i = 0; i < decided.size(); ++i)
+	{
+	    X_values[decided[i]] = poly_positions_X[decided[i]];
+	    Y_values[decided[i]] = poly_positions_Y[decided[i]];	    
+	}
+		
+	undecided.clear();
+	undecided.push_back(4);
+	undecided.push_back(5);
+	undecided.push_back(6);
+	undecided.push_back(7);
+
+	build_WeakPolygonNonoverlapping(z_solver,
+					z_context,
+					polygons,
+					X_positions,
+					Y_positions,
+					X_values,
+					Y_values,
+					decided,
+					undecided,				    
+					dec_var_names_map);    
+	
+	optimized = optimize_WeakPolygonNonoverlapping(z_solver,
+						       z_context,
+						       solver_configuration,
+						       X_positions,
+						       Y_positions,
+						       X_values,
+						       Y_values,
+						       decided,
+						       undecided,
+						       dec_var_names_map,
+						       polygons);
+	printf("Optimized 2: %d\n", optimized);
+	
+	decided.push_back(4);
+	decided.push_back(5);
+	decided.push_back(6);
+	decided.push_back(7);       
+	
+	finish = clock();
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided.size(); ++i)
+	    {
+		printf("  %.3f, %.3f\n", X_values[decided[i]].as_double(), Y_values[decided[i]].as_double());
+	    }
+	    
+	    SVG preview_svg("polygon_test_14.svg");
+	
+	    for (int i = 0; i < decided.size(); ++i)
+	    {
+		Polygon display_polygon = scale_UP(polygons[decided[i]], X_values[decided[i]].as_double(), Y_values[decided[i]].as_double());
+		
+		string color;
+		
+		switch(i)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+		case 7:
+		{
+		    color = "black";
+		    break;
+		}
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "aqua";
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}
+
+		preview_svg.draw(display_polygon, color);
+	    }
+    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}
+    }
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 14 ... finished\n");    
+}
+
+
+void test_polygon_15(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 15 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    vector<Polygon> polygons;
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+    
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+    
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    
+    /*
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);                
+    */
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    
+    /*
+    poly_positions_X.resize(polygons.size());
+    poly_positions_Y.resize(polygons.size());    
+    */
+
+    do
+    {
+	decided_polygons.clear();
+	remaining_polygons.clear();
+	
+	bool optimized = optimize_SubglobalPolygonNonoverlapping(solver_configuration,
+								 poly_positions_X,
+								 poly_positions_Y,
+								 polygons,
+								 polygon_index_map,
+								 decided_polygons,
+								 remaining_polygons);
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		printf("  %.3f, %.3f\n", poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double());
+	    }
+	    printf("Remaining polygons: %ld\n", remaining_polygons.size());
+	    for (int i = 0; i < remaining_polygons.size(); ++i)
+	    {
+		printf("  %d\n", remaining_polygons[i]);
+	    }
+	
+	    SVG preview_svg("polygon_test_15.svg");
+	
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		Polygon display_polygon = scale_UP(polygons[decided_polygons[i]],
+						   poly_positions_X[decided_polygons[i]].as_double(),
+						   poly_positions_Y[decided_polygons[i]].as_double());
+		
+		string color;
+		
+		switch(i)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+		case 7:
+		{
+		    color = "black";
+		    break;
+		}
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "aqua";
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}
+		
+		preview_svg.draw(display_polygon, color);
+	    }
+	    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}
+	getchar();
+	
+	vector<Polygon> next_polygons;
+	
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);
+	}
+	
+	polygon_index_map = remaining_polygons;
+	polygons.clear();
+	polygons = next_polygons;
+    }
+    while (!remaining_polygons.empty());
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 15 ... finished\n");    
+}    
+
+
+void test_polygon_16(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 16 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    vector<Polygon> polygons;
+    
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    double area = calc_PolygonUnreachableZoneArea(polygon_1, polygons);
+    printf("Polygons area: %.3f\n", area);
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing polygon 16 ... finished\n");    
+}    
+
+
+/*----------------------------------------------------------------*/
+
+int main(int SEQ_UNUSED(argc), char **SEQ_UNUSED(argv))
+{
+    //test_polygon_1();
+    //test_polygon_2();
+    //test_polygon_3();
+    //test_polygon_4();
+    //test_polygon_5();
+    //test_polygon_6();
+    //test_polygon_7();
+    //test_polygon_8();
+    //test_polygon_9();
+    //test_polygon_10();
+    //test_polygon_11();
+    //test_polygon_12();
+    //test_polygon_13();
+    //test_polygon_14();
+    //test_polygon_15();
+    test_polygon_16();    
+    
+    return 0;
+}
+
diff --git a/src/libseqarrange/test/seq_test_polygon.hpp b/src/libseqarrange/test/seq_test_polygon.hpp
new file mode 100644
index 0000000000..4f77968ade
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_polygon.hpp
@@ -0,0 +1,67 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_polygon.hpp
+ *
+ * Basic polygon tests.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_TEST_POLYGON_HPP__
+#define __SEQ_TEST_POLYGON_HPP__
+
+/*----------------------------------------------------------------*/
+
+/* Polygon test 1 */
+void test_polygon_1(void);
+
+/* Polygon test 2 */
+void test_polygon_2(void);
+
+/* Polygon test 3 */
+void test_polygon_3(void);
+
+/* Polygon test 4 */
+void test_polygon_4(void);
+
+/* Polygon test 5 */
+void test_polygon_5(void);
+
+/* Polygon test 6 */
+void test_polygon_6(void);
+
+/* Polygon test 7 */
+void test_polygon_7(void);
+
+/* Polygon test 8 */
+void test_polygon_8(void);
+
+/* Polygon test 9 */
+void test_polygon_9(void);
+
+/* Polygon test 10 */
+void test_polygon_10(void);
+
+/* Polygon test 11 */
+void test_polygon_11(void);
+
+/* Polygon test 12 */
+void test_polygon_12(void);
+
+/* Polygon test 13 */
+void test_polygon_13(void);
+
+/* Polygon test 14 */
+void test_polygon_14(void);
+
+/* Polygon test 15 */
+void test_polygon_15(void);
+
+/* Polygon test 16 */
+void test_polygon_16(void);
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_TEST_POLYGON_HPP__ */
diff --git a/src/libseqarrange/test/seq_test_preprocess.cpp b/src/libseqarrange/test/seq_test_preprocess.cpp
new file mode 100644
index 0000000000..899e8079fe
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_preprocess.cpp
@@ -0,0 +1,1134 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_preprocess.cpp
+ *
+ * Object preprocessing preprocess priting via SMT.
+ */
+/*================================================================*/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+
+#include <vector>
+#include "libslic3r/ExPolygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+#include "libslic3r/SVG.hpp"
+
+#include <z3++.h>
+
+#include "prusaparts.hpp"
+
+#include "seq_defs.hpp"
+
+#include "seq_sequential.hpp"
+#include "seq_preprocess.hpp"
+
+#include "seq_test_sequential.hpp"
+
+
+/*----------------------------------------------------------------*/
+
+using namespace z3;
+
+using namespace Slic3r;
+using namespace Slic3r::Geometry;
+
+using namespace Sequential;
+
+
+#define SCALE_FACTOR                  50000.0
+
+/*----------------------------------------------------------------*/
+
+
+Polygon scale_UP(const Polygon &polygon)
+{
+    Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {
+	poly.points[i] = Point(poly.points[i].x() * SCALE_FACTOR, poly.points[i].y() * SCALE_FACTOR);
+    }
+
+    return poly;
+}
+
+
+Polygon scale_UP(const Polygon &polygon, double x_pos, double y_pos)
+{
+    Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {	
+	poly.points[i] = Point(poly.points[i].x() * SCALE_FACTOR + x_pos * SCALE_FACTOR,
+			       poly.points[i].y() * SCALE_FACTOR + y_pos * SCALE_FACTOR);
+    }
+
+    return poly;
+}
+
+
+std::vector<Polygon> test_polygons;
+
+void test_preprocess_1(void)
+{
+    clock_t start, finish;
+    
+    printf("Testing preprocessing 1 ...\n");
+
+    SolverConfiguration solver_configuration;    
+
+    start = clock();
+    for (int i = 0; i < PRUSA_PART_POLYGONS.size(); ++i)
+    {
+	Polygon scale_down_polygon;
+	scaleDown_PolygonForSequentialSolver(PRUSA_PART_POLYGONS[i], scale_down_polygon);       
+	test_polygons.push_back(scale_down_polygon);
+    }
+
+    for (int i = 0; i < test_polygons.size(); ++i)
+    {
+	SVG preview_svg("preprocess_test_1.svg");
+	Polygon display_polygon = scale_UP(test_polygons[i], 1000, 1000);
+	preview_svg.draw(display_polygon, "blue");
+	preview_svg.Close();
+	getchar();
+    }
+    
+    
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing preprocessing 1 ... finished\n");    
+}
+
+
+void test_preprocess_2(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing preprocess 2 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    vector<Polygon> polygons;
+    vector<Polygon> unreachable_polygons;
+    
+    for (int i = 0; i < PRUSA_PART_POLYGONS.size(); ++i)
+    {
+	Polygon scale_down_polygon;
+	scaleDown_PolygonForSequentialSolver(PRUSA_PART_POLYGONS[i], scale_down_polygon);
+	scale_down_polygon.make_counter_clockwise();
+	polygons.push_back(scale_down_polygon);
+	unreachable_polygons.push_back(scale_down_polygon);
+    }
+    
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;    
+    
+    do
+    {
+	decided_polygons.clear();
+	remaining_polygons.clear();
+	
+	bool optimized = optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+											 poly_positions_X,
+											 poly_positions_Y,
+											 times_T,
+											 polygons,
+											 unreachable_polygons,
+											 polygon_index_map,
+											 decided_polygons,
+											 remaining_polygons);
+
+	printf("----> Optimization finished <----\n");
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		printf("  [%d] %.3f, %.3f (%.3f)\n", decided_polygons[i], poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double(), times_T[decided_polygons[i]].as_double());
+	    }
+	    printf("Remaining polygons: %ld\n", remaining_polygons.size());
+	    for (int i = 0; i < remaining_polygons.size(); ++i)
+	    {
+		printf("  %d\n", remaining_polygons[i]);
+	    }
+	
+	    SVG preview_svg("preprocess_test_2.svg");
+
+	    if (!unreachable_polygons.empty())
+	    {
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    /*
+		    printf("----> %.3f,%.3f\n", poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double());		    
+		    for (int k = 0; k < polygons[decided_polygons[i]].points.size(); ++k)
+		    {
+			printf("    xy: %d, %d\n", polygons[decided_polygons[i]].points[k].x(), polygons[decided_polygons[i]].points[k].y());
+		    }
+		    */		    
+//		    for (int j = 0; j < unreachable_polygons[decided_polygons[i]].size(); ++j)
+		    {
+			/*
+			for (int k = 0; k < unreachable_polygons[decided_polygons[i]][j].points.size(); ++k)
+			{
+			    printf("    Pxy: %d, %d\n", unreachable_polygons[decided_polygons[i]][j].points[k].x(), unreachable_polygons[decided_polygons[i]][j].points[k].y());
+			}
+			*/
+			Polygon display_unreachable_polygon = scale_UP(unreachable_polygons[decided_polygons[i]],
+								      poly_positions_X[decided_polygons[i]].as_double(),
+								      poly_positions_Y[decided_polygons[i]].as_double());
+			preview_svg.draw(display_unreachable_polygon, "lightgrey");   
+		    }
+		}
+	    }	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		Polygon display_polygon = scale_UP(polygons[decided_polygons[i]],
+						   poly_positions_X[decided_polygons[i]].as_double(),
+						   poly_positions_Y[decided_polygons[i]].as_double());
+		
+		string color;
+		
+		switch(i)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+		case 7:
+		{
+		    color = "black";
+		    break;
+		}
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "aqua";
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}
+		
+		preview_svg.draw(display_polygon, color);
+	    }
+	    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}
+	finish = clock();	
+	printf("Intermediate time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+	getchar();
+	
+	vector<Polygon> next_polygons;
+	vector<Polygon> next_unreachable_polygons;
+
+	for (int i = 0; i < polygon_index_map.size(); ++i)
+	{
+	    printf("  %d\n", polygon_index_map[i]);
+	}
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    polygon_index_map.push_back(index);
+	}
+    }
+    while (!remaining_polygons.empty());
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing preprocess 2 ... finished\n");    
+}    
+
+
+void test_preprocess_3(void)
+{
+    clock_t start, finish;
+
+    SolverConfiguration solver_configuration;    
+    printf("Testing preprocessing 3 ...\n");
+
+    start = clock();
+
+    std::vector<Slic3r::Polygon> nozzle_unreachable_polygons;
+    std::vector<Slic3r::Polygon> extruder_unreachable_polygons;
+    std::vector<Slic3r::Polygon> hose_unreachable_polygons;
+    std::vector<Slic3r::Polygon> gantry_unreachable_polygons;            
+
+    for (int p = 0; p < PRUSA_PART_POLYGONS.size(); ++p)
+    {
+	{
+	    nozzle_unreachable_polygons.clear();
+	    
+	    extend_PolygonConvexUnreachableZone(solver_configuration,
+					       PRUSA_PART_POLYGONS[p],
+					       SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S,
+					       nozzle_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S[j], "lightgrey");
+	    }
+	    
+	    if (!nozzle_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < nozzle_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(nozzle_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+	
+	    preview_svg.Close();
+	    getchar();
+	}
+
+	{
+	    nozzle_unreachable_polygons.clear();
+	    
+	    extend_PolygonBoxUnreachableZone(solver_configuration,
+					    PRUSA_PART_POLYGONS[p],
+					    SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S,
+					    nozzle_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");	    
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK3S[j], "lightgrey");
+	    }
+	
+	    if (!nozzle_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < nozzle_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(nozzle_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "red");
+	
+	    preview_svg.Close();
+	    getchar();
+	}
+
+	{
+	    extruder_unreachable_polygons.clear();
+	    
+	    extend_PolygonConvexUnreachableZone(solver_configuration,
+					       PRUSA_PART_POLYGONS[p],
+					       SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S,
+					       extruder_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S[j], "lightgrey");
+	    }
+	    
+	    if (!extruder_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < extruder_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(extruder_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "green");
+	
+	    preview_svg.Close();
+	    getchar();
+	}
+
+	{
+	    extruder_unreachable_polygons.clear();
+	    
+	    extend_PolygonBoxUnreachableZone(solver_configuration,
+					    PRUSA_PART_POLYGONS[p],
+					    SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S,
+					    extruder_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");	    
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK3S[j], "lightgrey");
+	    }
+	
+	    if (!extruder_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < extruder_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(extruder_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "magenta");
+	
+	    preview_svg.Close();
+	    getchar();
+	}
+
+	{
+	    hose_unreachable_polygons.clear();
+	    
+	    extend_PolygonConvexUnreachableZone(solver_configuration,
+					       PRUSA_PART_POLYGONS[p],
+					       SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S,
+					       hose_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S[j], "lightgrey");
+	    }
+	    
+	    if (!hose_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < hose_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(hose_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "yellow");
+	
+	    preview_svg.Close();
+	    getchar();
+	}
+
+	{
+	    hose_unreachable_polygons.clear();
+	    
+	    extend_PolygonBoxUnreachableZone(solver_configuration,
+					    PRUSA_PART_POLYGONS[p],
+					    SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S,
+					    hose_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");	    
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_HOSE_LEVEL_MK3S[j], "lightgrey");
+	    }
+	
+	    if (!hose_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < hose_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(hose_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "orange");
+	
+	    preview_svg.Close();
+	    getchar();
+	}
+
+	{
+	    gantry_unreachable_polygons.clear();
+	    
+	    extend_PolygonConvexUnreachableZone(solver_configuration,
+					       PRUSA_PART_POLYGONS[p],
+					       SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S,
+					       gantry_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S[j], "lightgrey");
+	    }
+	    
+	    if (!gantry_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < gantry_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(gantry_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "grey");
+	
+	    preview_svg.Close();
+	    getchar();
+	}
+
+	{
+	    gantry_unreachable_polygons.clear();
+	    
+	    extend_PolygonBoxUnreachableZone(solver_configuration,
+					    PRUSA_PART_POLYGONS[p],
+					    SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S,
+					    gantry_unreachable_polygons);
+	    
+	    SVG preview_svg("preprocess_test_3.svg");	    
+
+	    //preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	
+	    for (int j = 0; j < SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S.size(); ++j)
+	    {
+		preview_svg.draw(SEQ_UNREACHABLE_POLYGON_GANTRY_LEVEL_MK3S[j], "lightgrey");
+	    }
+	
+	    if (!gantry_unreachable_polygons.empty())
+	    {
+		for (int j = 0; j < gantry_unreachable_polygons.size(); ++j)
+		{
+		    preview_svg.draw(gantry_unreachable_polygons[j], "lightgrey");		    
+		}		
+	    }
+	    preview_svg.draw(PRUSA_PART_POLYGONS[p], "black");
+	
+	    preview_svg.Close();
+	    getchar();
+	}			
+    }    
+    
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing preprocess 3 ... finished\n");    
+
+}
+
+
+void test_preprocess_4(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing preprocess 4 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+    for (int i = 0; i < 12/*PRUSA_PART_POLYGONS.size()*/; ++i)
+    {
+	Polygon scale_down_polygon;
+	scaleDown_PolygonForSequentialSolver(PRUSA_PART_POLYGONS[i], scale_down_polygon);
+	polygons.push_back(scale_down_polygon);
+
+	std::vector<Slic3r::Polygon> convex_level_polygons;
+	convex_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);
+	convex_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);	
+	std::vector<Slic3r::Polygon> box_level_polygons;
+	box_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);
+	box_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);		
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;
+	prepare_UnreachableZonePolygons(solver_configuration,
+				       convex_level_polygons,
+				       box_level_polygons,
+				       SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK3S,
+				       SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK3S,
+				       scale_down_unreachable_polygons);
+	unreachable_polygons.push_back(scale_down_unreachable_polygons);
+    }
+    
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;    
+    
+    do
+    {
+	decided_polygons.clear();
+	remaining_polygons.clear();
+	
+	bool optimized = optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+											 poly_positions_X,
+											 poly_positions_Y,
+											 times_T,
+											 polygons,
+											 unreachable_polygons,
+											 polygon_index_map,
+											 decided_polygons,
+											 remaining_polygons);
+
+	printf("----> Optimization finished <----\n");
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		printf("  [%d] %.3f, %.3f (%.3f)\n", decided_polygons[i], poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double(), times_T[decided_polygons[i]].as_double());
+	    }
+	    printf("Remaining polygons: %ld\n", remaining_polygons.size());
+	    for (int i = 0; i < remaining_polygons.size(); ++i)
+	    {
+		printf("  %d\n", remaining_polygons[i]);
+	    }
+	
+	    SVG preview_svg("preprocess_test_4.svg");
+
+	    if (!unreachable_polygons.empty())
+	    {
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    /*
+		    printf("----> %.3f,%.3f\n", poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double());		    
+		    for (int k = 0; k < polygons[decided_polygons[i]].points.size(); ++k)
+		    {
+			printf("    xy: %d, %d\n", polygons[decided_polygons[i]].points[k].x(), polygons[decided_polygons[i]].points[k].y());
+		    }
+		    */		    
+		    for (int j = 0; j < unreachable_polygons[decided_polygons[i]].size(); ++j)
+		    {
+			/*
+			for (int k = 0; k < unreachable_polygons[decided_polygons[i]][j].points.size(); ++k)
+			{
+			    printf("    Pxy: %d, %d\n", unreachable_polygons[decided_polygons[i]][j].points[k].x(), unreachable_polygons[decided_polygons[i]][j].points[k].y());
+			}
+			*/
+			Polygon display_unreachable_polygon = scale_UP(unreachable_polygons[decided_polygons[i]][j],
+								      poly_positions_X[decided_polygons[i]].as_double(),
+								      poly_positions_Y[decided_polygons[i]].as_double());
+			preview_svg.draw(display_unreachable_polygon, "lightgrey");   
+		    }
+		}
+	    }	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		Polygon display_polygon = scale_UP(polygons[decided_polygons[i]],
+						   poly_positions_X[decided_polygons[i]].as_double(),
+						   poly_positions_Y[decided_polygons[i]].as_double());
+		
+		string color;
+		
+		switch(i)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+		case 7:
+		{
+		    color = "black";
+		    break;
+		}
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "aqua";
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}
+		
+		preview_svg.draw(display_polygon, color);
+	    }
+	    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}
+	finish = clock();	
+	printf("Intermediate time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+	getchar();
+	
+	vector<Polygon> next_polygons;
+	vector<vector<Polygon> > next_unreachable_polygons;
+
+	for (int i = 0; i < polygon_index_map.size(); ++i)
+	{
+	    printf("  %d\n", polygon_index_map[i]);
+	}
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    polygon_index_map.push_back(index);
+	}
+    }
+    while (!remaining_polygons.empty());
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing preprocess 4 ... finished\n");    
+}    
+
+
+void test_preprocess_5(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing preprocess 5 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+    
+    for (int i = 0; i < PRUSA_PART_POLYGONS.size(); ++i)
+    {
+	Polygon simplified_polygon;
+	
+	decimate_PolygonForSequentialSolver(solver_configuration,
+					    PRUSA_PART_POLYGONS[i],
+					    simplified_polygon);	
+	/*
+	scaleDown_PolygonForSequentialSolver(solver_configuration, PRUSA_PART_POLYGONS[i], scale_down_polygon);
+	polygons.push_back(scale_down_polygon);
+
+	std::vector<Slic3r::Polygon> convex_level_polygons;
+	convex_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);
+	convex_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);	
+	std::vector<Slic3r::Polygon> box_level_polygons;
+	box_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);
+	box_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);		
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;
+	prepare_UnreachableZonePolygons(solver_configuration,
+				       convex_level_polygons,
+				       box_level_polygons,
+				       SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK3S,
+				       SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK3S,
+				       scale_down_unreachable_polygons);
+	unreachable_polygons.push_back(scale_down_unreachable_polygons);
+	*/
+	SVG preview_svg("preprocess_test_5.svg");
+
+	//preview_svg.draw(PRUSA_PART_POLYGONS[p], "blue");
+
+	preview_svg.draw(simplified_polygon, "lightgrey");	
+	preview_svg.draw(PRUSA_PART_POLYGONS[i], "blue");	    
+	
+	preview_svg.Close();
+	getchar();	
+    }
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing preprocess 5 ... finished\n");
+}
+
+
+void test_preprocess_6(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing preprocess 6 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    std::vector<Slic3r::Polygon> polygons;
+    std::vector<std::vector<Slic3r::Polygon> > unreachable_polygons;
+    for (int i = 0; i < PRUSA_PART_POLYGONS.size(); ++i)
+    {
+	Polygon decimated_polygon;
+	decimate_PolygonForSequentialSolver(solver_configuration,
+					    PRUSA_PART_POLYGONS[i],
+					    decimated_polygon);		
+	
+	Polygon scale_down_polygon;
+	scaleDown_PolygonForSequentialSolver(decimated_polygon, scale_down_polygon);
+	polygons.push_back(scale_down_polygon);
+
+	std::vector<Slic3r::Polygon> convex_level_polygons;
+	convex_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);
+	convex_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);	
+	std::vector<Slic3r::Polygon> box_level_polygons;
+	box_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);
+	box_level_polygons.push_back(PRUSA_PART_POLYGONS[i]);		
+	
+	std::vector<Slic3r::Polygon> scale_down_unreachable_polygons;
+	prepare_UnreachableZonePolygons(solver_configuration,
+				       convex_level_polygons,
+				       box_level_polygons,
+				       SEQ_UNREACHABLE_POLYGON_CONVEX_LEVELS_MK3S,
+				       SEQ_UNREACHABLE_POLYGON_BOX_LEVELS_MK3S,
+				       scale_down_unreachable_polygons);
+	unreachable_polygons.push_back(scale_down_unreachable_polygons);
+    }
+    
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;    
+    
+    do
+    {
+	decided_polygons.clear();
+	remaining_polygons.clear();
+	
+	bool optimized = optimize_SubglobalSequentialPolygonNonoverlappingBinaryCentered(solver_configuration,
+											 poly_positions_X,
+											 poly_positions_Y,
+											 times_T,
+											 polygons,
+											 unreachable_polygons,
+											 polygon_index_map,
+											 decided_polygons,
+											 remaining_polygons);
+
+	printf("----> Optimization finished <----\n");
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		printf("  [%d] %.3f, %.3f (%.3f)\n", decided_polygons[i], poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double(), times_T[decided_polygons[i]].as_double());
+	    }
+	    printf("Remaining polygons: %ld\n", remaining_polygons.size());
+	    for (int i = 0; i < remaining_polygons.size(); ++i)
+	    {
+		printf("  %d\n", remaining_polygons[i]);
+	    }
+	
+	    SVG preview_svg("preprocess_test_6.svg");
+
+	    if (!unreachable_polygons.empty())
+	    {
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    /*
+		    printf("----> %.3f,%.3f\n", poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double());		    
+		    for (int k = 0; k < polygons[decided_polygons[i]].points.size(); ++k)
+		    {
+			printf("    xy: %d, %d\n", polygons[decided_polygons[i]].points[k].x(), polygons[decided_polygons[i]].points[k].y());
+		    }
+		    */		    
+		    for (int j = 0; j < unreachable_polygons[decided_polygons[i]].size(); ++j)
+		    {
+			/*
+			for (int k = 0; k < unreachable_polygons[decided_polygons[i]][j].points.size(); ++k)
+			{
+			    printf("    Pxy: %d, %d\n", unreachable_polygons[decided_polygons[i]][j].points[k].x(), unreachable_polygons[decided_polygons[i]][j].points[k].y());
+			}
+			*/
+			Polygon display_unreachable_polygon = scale_UP(unreachable_polygons[decided_polygons[i]][j],
+								      poly_positions_X[decided_polygons[i]].as_double(),
+								      poly_positions_Y[decided_polygons[i]].as_double());
+			preview_svg.draw(display_unreachable_polygon, "lightgrey");   
+		    }
+		}
+	    }	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		Polygon display_polygon = scale_UP(polygons[decided_polygons[i]],
+						   poly_positions_X[decided_polygons[i]].as_double(),
+						   poly_positions_Y[decided_polygons[i]].as_double());
+		
+		string color;
+		
+		switch(i)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+		case 7:
+		{
+		    color = "black";
+		    break;
+		}
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "aqua";
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}
+		
+		preview_svg.draw(display_polygon, color);
+	    }
+	    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}
+	finish = clock();	
+	printf("Intermediate time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+	getchar();
+	
+	vector<Polygon> next_polygons;
+	vector<vector<Polygon> > next_unreachable_polygons;
+
+	for (int i = 0; i < polygon_index_map.size(); ++i)
+	{
+	    printf("  %d\n", polygon_index_map[i]);
+	}
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    polygon_index_map.push_back(index);
+	}
+    }
+    while (!remaining_polygons.empty());
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing preprocess 6 ... finished\n");    
+}    
+
+
+/*----------------------------------------------------------------*/
+
+int main(int SEQ_UNUSED(argc), char **SEQ_UNUSED(argv))
+{
+    //test_preprocess_1();
+    //test_preprocess_2();
+    //test_preprocess_3();
+    //test_preprocess_4();
+    //test_preprocess_5();
+    test_preprocess_6();
+    
+    return 0;
+}
+
diff --git a/src/libseqarrange/test/seq_test_preprocess.hpp b/src/libseqarrange/test/seq_test_preprocess.hpp
new file mode 100644
index 0000000000..ec57751b36
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_preprocess.hpp
@@ -0,0 +1,38 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_preprocess.hpp
+ *
+ * Object preprocessing for sequential priting via SMT.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_TEST_PREPROCESS_HPP__
+#define __SEQ_TEST_PREPROCESS_HPP__
+
+/*----------------------------------------------------------------*/
+
+/* Preprocess test 1 */
+void test_preprocess_1(void);
+
+/* Preprocess test 2 */
+void test_preprocess_2(void);
+
+/* Preprocess test 3 */
+void test_preprocess_3(void);
+
+/* Preprocess test 4 */
+void test_preprocess_4(void);
+
+/* Preprocess test 5 */
+void test_preprocess_5(void);
+
+/* Preprocess test 6 */
+void test_preprocess_6(void);
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_TEST_PREPROCESS_HPP__ */
diff --git a/src/libseqarrange/test/seq_test_sequential.cpp b/src/libseqarrange/test/seq_test_sequential.cpp
new file mode 100644
index 0000000000..9f7757b58f
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_sequential.cpp
@@ -0,0 +1,2307 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_sequential.cpp
+ *
+ * Basic steel plate sequential object scheduling via SMT.
+ */
+/*================================================================*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+
+#include <vector>
+#include "libslic3r/ExPolygon.hpp"
+#include "libslic3r/Geometry/ConvexHull.hpp"
+#include "libslic3r/SVG.hpp"
+
+#include <z3++.h>
+
+#include "seq_defs.hpp"
+#include "seq_sequential.hpp"
+
+#include "seq_test_sequential.hpp"
+
+#ifndef M_PI
+#define M_PI 3.14159
+#endif
+
+
+/*----------------------------------------------------------------*/
+
+using namespace z3;
+
+using namespace Slic3r;
+using namespace Slic3r::Geometry;
+
+using namespace Sequential;
+
+
+#define SCALE_FACTOR                  100000.0
+
+/*----------------------------------------------------------------*/
+
+
+Polygon scale_UP(const Polygon &polygon)
+{
+    Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {
+	poly.points[i] = Point(poly.points[i].x() * SCALE_FACTOR, poly.points[i].y() * SCALE_FACTOR);
+    }
+
+    return poly;
+}
+
+
+Polygon scale_UP(const Polygon &polygon, double x_pos, double y_pos)
+{
+    Polygon poly = polygon;
+
+    for (int i = 0; i < poly.points.size(); ++i)
+    {	
+	poly.points[i] = Point(poly.points[i].x() * SCALE_FACTOR + x_pos * SCALE_FACTOR,
+			       poly.points[i].y() * SCALE_FACTOR + y_pos * SCALE_FACTOR);
+    }
+
+    return poly;
+}
+
+
+void test_sequential_1(void)
+{
+    printf("Testing sequential scheduling 1 ...\n");
+
+    z3::context z_context;
+    
+    z3::expr x(z_context.bool_const("x"));
+    z3::expr y(z_context.bool_const("y"));
+    z3::expr z(z_context.bool_const("z"));
+
+    z3::expr a(z_context.int_const("a"));
+    z3::expr b(z_context.int_const("b"));
+
+    z3::expr c(z_context.real_const("cf"));
+    z3::expr d(z_context.real_const("df"));    
+    
+
+//    z3::expr lhs(!x || y);
+    z3::expr lhs(x || y);    
+    z3::expr rhs(implies(x, y));
+    z3::expr final(lhs == rhs);
+
+    z3::expr lhs1(a);
+    z3::expr rhs1(b);
+    z3::expr final2(lhs1 == rhs1);
+
+    z3::expr lhs2(a > 2);
+    z3::expr rhs2(b < 4);
+    z3::expr final3(lhs2 || rhs2);
+    z3::expr final4(a > 5);
+    z3::expr final5(final3 && final4);
+
+    z3::expr ef1((c > 3 && d < 6) && c < d);
+    
+    z3::solver z_solver(z_context);
+    //z_solver.add(!final);
+    z_solver.add(final2);
+    z_solver.add(final5);
+    z_solver.add(ef1);
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s\n", z_model[i].name().str().c_str());
+	printf("Printing interpretation:\n");
+	
+	cout << z_model.get_const_interp(z_model[i]) << "\n";
+
+	switch (z_model.get_const_interp(z_model[i]).is_bool())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+    }    
+    
+    printf("Testing sequential scheduling 1 ... finished\n");    
+}
+
+
+int complex_sheet_resolution_X = 200;
+int complex_sheet_resolution_Y = 50;
+
+int complex_sheet_resolution_X_min = 10;
+int complex_sheet_resolution_X_max = 200;
+int complex_sheet_resolution_Y_min = 10;
+int complex_sheet_resolution_Y_max = 200;
+
+int complex_time_resolution = 1000;
+int complex_height_threshold = 25;
+
+const int complex_Obj_count = 26;
+
+int complex_Obj_widths[complex_Obj_count];
+int complex_Obj_heights[complex_Obj_count];
+int complex_Obj_durations[complex_Obj_count];
+
+const int min_width = 4;
+const int max_width = 20;
+
+const int min_height = 4;
+const int max_height = 20;
+
+const int min_duration = 2;
+const int max_duration = 50;
+
+const int gantry_left_height = 10;
+const int gantry_left_shift = 4;
+
+const int gantry_right_height = 10;
+const int gantry_right_shift = 4;
+
+
+void generate_random_complex_objects(void)
+{
+    int width_span =  max_width - min_width;
+    int height_span =  max_height - min_height;
+    int duration_span =  max_duration - min_duration;
+	
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	printf("Generating random object %d ...\n", i);
+	
+	complex_Obj_widths[i] = min_width + rand() % width_span;
+	complex_Obj_heights[i] = min_height + rand() % height_span;
+	complex_Obj_durations[i] = min_duration + rand() % duration_span;
+
+	printf("O %d: w:%d h:%d d:%d\n", i, complex_Obj_widths[i], complex_Obj_heights[i], complex_Obj_durations[i]);
+    }
+}
+
+
+typedef std::basic_string<char> sString;
+
+void test_sequential_2(void)
+{
+    clock_t start, finish;
+    
+    printf("Testing sequential scheduling 2 ...\n");
+    generate_random_complex_objects();
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T_schedules(z_context);
+    
+    z3::expr_vector gantry_lefts(z_context);
+    z3::expr_vector gantry_rights(z_context);    
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "time-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T_schedules.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name_L = "gantry_L-" + to_string(i);
+	printf("name_L: %s\n", name_L.c_str());
+	
+	sString name_R = "gantry_R-" + to_string(i);
+	printf("name_R: %s\n", name_R.c_str());
+	
+	gantry_lefts.push_back(expr(z_context.real_const(name_L.c_str())));
+	gantry_rights.push_back(expr(z_context.real_const(name_R.c_str())));	
+    }        
+    
+//    z3::expr lhs(!x || y);
+    /*
+    z3::expr final(lhs == rhs);
+
+    z3::expr lhs1(a);
+    z3::expr rhs1(b);
+    z3::expr final2(lhs1 == rhs1);
+
+    z3::expr ef1((c > 3 && d < 6) && c < d);
+    */
+    z3::solver z_solver(z_context);
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	z_solver.add(X_positions[i] >= 0 && X_positions[i] + complex_Obj_widths[i] <= complex_sheet_resolution_X);
+	z_solver.add(Y_positions[i] >= 0 && Y_positions[i] + complex_Obj_heights[i] <= complex_sheet_resolution_Y);
+	z_solver.add(T_schedules[i] >= 0 && T_schedules[i] + complex_Obj_durations[i] <= complex_time_resolution);
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	for (int j = 0; j < complex_Obj_count; ++j)
+	{
+	    if (i < j)
+	    {
+		z_solver.add(   X_positions[i] >= X_positions[j] + complex_Obj_widths[j]
+			     || X_positions[j] >= X_positions[i] + complex_Obj_widths[i]
+			     || Y_positions[i] >= Y_positions[j] + complex_Obj_heights[j]
+			     || Y_positions[j] >= Y_positions[i] + complex_Obj_heights[i]);
+	    }
+	}
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	for (int j = 0; j < complex_Obj_count; ++j)
+	{
+	    if (i < j)
+	    {
+		z_solver.add(   T_schedules[i] >= T_schedules[j] + complex_Obj_durations[j]
+			     || T_schedules[j] >= T_schedules[i] + complex_Obj_durations[i]);
+	    }
+	}
+	
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	if (complex_Obj_durations[i] >= complex_height_threshold)
+	{
+	    z_solver.add(gantry_lefts[i] == Y_positions[i] + gantry_left_shift && gantry_rights[i] == Y_positions[i] + gantry_right_shift);
+	}
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	if (complex_Obj_durations[i] >= complex_height_threshold)
+	{
+	    for (int j = 0; j < complex_Obj_count; ++j)
+	    {
+		if (i != j)
+		{
+		    z_solver.add(   T_schedules[j] < T_schedules[i]
+				 || Y_positions[j] >= gantry_rights[i] + gantry_right_height
+				 || gantry_rights[i] >= Y_positions[j] + complex_Obj_heights[j]);
+		    
+		    z_solver.add(   T_schedules[j] < T_schedules[i]
+				 || Y_positions[j] >= gantry_lefts[i] + gantry_left_height
+				 || Y_positions[i] >= Y_positions[j] + complex_Obj_heights[j]);  
+		}
+	    }
+	}
+    }       	    
+
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	return;
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }   
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+
+    finish = clock();    
+    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s\n", z_model[i].name().str().c_str());
+	
+	printf("Printing interpretation:\n");
+	cout << z_model.get_const_interp(z_model[i]) << "\n";
+	
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	//double val;
+	//printf("%s\n", z_model.get_const_interp(z_model[i]).get_string().c_str());
+    }    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing sequential scheduling 2 ... finished\n");    
+}
+
+
+const int complex_max_rotation = 8;
+
+int rotated_Obj_widths[complex_Obj_count][complex_max_rotation];
+int rotated_Obj_heights[complex_Obj_count][complex_max_rotation];
+
+void generate_random_rotated_complex_objects(void)
+{
+    int width_span =  max_width - min_width;
+    int height_span =  max_height - min_height;
+    int duration_span =  max_duration - min_duration;
+	
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	printf("Generating random object %d ...\n", i);
+
+	int base_width = min_width + rand() % width_span;
+	int base_height = min_height + rand() % height_span;
+
+	double angle = 0;
+	double angle_step = 0.5 * M_PI / complex_max_rotation;
+	
+	for (int r = 0; r < complex_max_rotation; ++r)
+	{
+	    int width = cos(angle) * base_width + min_width;
+	    int height = sin(angle) * base_height + min_height;
+
+	    printf("w: %d, h: %d\n", width, height);
+	    
+	    rotated_Obj_widths[i][r] = width;
+	    rotated_Obj_heights[i][r] = height;
+	    
+	    angle += angle_step;
+
+	    printf("O %d: w:%d h:%d d:%d\n", i, rotated_Obj_widths[i][r], rotated_Obj_heights[i][r], complex_Obj_durations[i]);	    
+	}
+	
+	complex_Obj_durations[i] = min_duration + rand() % duration_span;
+    }
+}
+
+
+void test_sequential_3(void)
+{
+    clock_t start, finish;
+    
+    printf("Testing sequential scheduling 3 ...\n");
+    generate_random_rotated_complex_objects();
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T_schedules(z_context);
+    
+    z3::expr_vector gantry_lefts(z_context);
+    z3::expr_vector gantry_rights(z_context);
+
+    z3::expr_vector rotations(z_context);
+    z3::expr_vector widths(z_context);
+    z3::expr_vector heights(z_context);    
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "time-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T_schedules.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "width-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	widths.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "height-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	heights.push_back(expr(z_context.real_const(name.c_str())));
+    }        
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name = "rot-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	rotations.push_back(expr(z_context.int_const(name.c_str())));
+    }    
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	sString name_L = "gantry_L-" + to_string(i);
+	printf("name_L: %s\n", name_L.c_str());
+	
+	sString name_R = "gantry_R-" + to_string(i);
+	printf("name_R: %s\n", name_R.c_str());
+	
+	gantry_lefts.push_back(expr(z_context.real_const(name_L.c_str())));
+	gantry_rights.push_back(expr(z_context.real_const(name_R.c_str())));	
+    }        
+    
+    z3::solver z_solver(z_context);
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	z_solver.add(X_positions[i] >= 0 && X_positions[i] + complex_Obj_widths[i] <= complex_sheet_resolution_X);
+	z_solver.add(Y_positions[i] >= 0 && Y_positions[i] + complex_Obj_heights[i] <= complex_sheet_resolution_Y);
+	z_solver.add(T_schedules[i] >= 0 && T_schedules[i] + complex_Obj_durations[i] <= complex_time_resolution);
+	z_solver.add(rotations[i] >= 0 && rotations[i] < complex_max_rotation);	
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	for (int r = 0; r < complex_max_rotation; ++r)
+	{
+	    z_solver.add(rotations[i] != r || widths[i] == rotated_Obj_widths[i][r]);
+	    z_solver.add(rotations[i] != r || heights[i] == rotated_Obj_heights[i][r]);
+	}	
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	for (int j = 0; j < complex_Obj_count; ++j)
+	{
+	    if (i < j)
+	    {
+		z_solver.add(   X_positions[i] >= X_positions[j] + widths[j]
+			     || X_positions[j] >= X_positions[i] + widths[i]
+			     || Y_positions[i] >= Y_positions[j] + heights[j]
+			     || Y_positions[j] >= Y_positions[i] + heights[i]);
+	    }
+	}
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	for (int j = 0; j < complex_Obj_count; ++j)
+	{
+	    if (i < j)
+	    {
+		z_solver.add(   T_schedules[i] >= T_schedules[j] + complex_Obj_durations[j]
+			     || T_schedules[j] >= T_schedules[i] + complex_Obj_durations[i]);
+	    }
+	}
+	
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	if (complex_Obj_durations[i] >= complex_height_threshold)
+	{
+	    z_solver.add(gantry_lefts[i] == Y_positions[i] + gantry_left_shift && gantry_rights[i] == Y_positions[i] + gantry_right_shift);
+	}
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	if (complex_Obj_durations[i] >= complex_height_threshold)
+	{
+	    for (int j = 0; j < complex_Obj_count; ++j)
+	    {
+		if (i != j)
+		{
+		    z_solver.add(   T_schedules[j] < T_schedules[i]
+				 || Y_positions[j] >= gantry_rights[i] + gantry_right_height
+				 || gantry_rights[i] >= Y_positions[j] + heights[j]);
+		    
+		    z_solver.add(   T_schedules[j] < T_schedules[i]
+				 || Y_positions[j] >= gantry_lefts[i] + gantry_left_height
+				 || Y_positions[i] >= Y_positions[j] + heights[j]);  
+		}
+	    }
+	}
+    }       	    
+
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+    
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+
+    switch (z_solver.check())
+    {
+    case z3::sat:
+    {
+	printf("  SATISFIABLE\n");
+	break;
+    }
+    case z3::unsat:	
+    {
+	printf("  UNSATISFIABLE\n");
+	return;
+	break;
+    }
+    case z3::unknown:
+    {
+	printf("  UNKNOWN\n");
+	break;
+    }
+    default:
+    {
+	break;
+    }
+    }   
+
+    z3::model z_model(z_solver.get_model());
+    printf("Printing model:\n");
+    cout << z_model << "\n";
+
+    finish = clock();    
+    
+    for (int i = 0; i < z_model.size(); ++i)
+    {
+	printf("Variable:%s\n", z_model[i].name().str().c_str());
+	
+	printf("Printing interpretation:\n");
+	cout << z_model.get_const_interp(z_model[i]) << "\n";
+	
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+
+    for (int i = 0; i < complex_Obj_count; ++i)
+    {
+	//double val;
+	//printf("%s\n", z_model.get_const_interp(z_model[i]).get_string().c_str());
+    }    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing sequential scheduling 3 ... finished\n");    
+}
+
+
+Polygon polygon_1 = {{0, 0}, {50, 0}, {50, 50}, {0, 50}};
+Polygon polygon_2 = {{0, 0}, {150, 10}, {150, 50}, {75, 120}, {0, 50} };
+//Polygon polygon_2 = {{0, 0}, {0, 50}, {75, 120}, {150, 50}, {150, 0} };
+Polygon polygon_3 = {{40, 0}, {80, 40}, {40, 80}, {0, 40}};
+//Polygon polygon_3 = {{40, 0}, {0, 40},{40, 80}, {80, 40}};
+Polygon polygon_4 = {{20, 0}, {40, 0}, {60, 30}, {30, 50}, {0, 30}};
+//Polygon polygon_4 = {{20, 0}, {0, 30}, {30, 50}, {60, 30}, {40, 0} };
+
+Polygon unreachable_polygon_1 = {{-5, -5}, {60, -5}, {60, 60}, {-5, 60}};
+Polygon unreachable_polygon_2 = {{-20, -20}, {170, -20}, {170, 86}, {85, 140}, {-20, 60} };
+Polygon unreachable_polygon_3 = {{40, -10}, {90, 40}, {40, 90}, {-10, 40}};
+Polygon unreachable_polygon_4 = {{10, -10}, {40, -10}, {70, 40}, {30, 60}, {-10, 40}};
+//Polygon unreachable_polygon_4 = {{10, -1}, {40, -1}, {70, 40}, {30, 60}, {0, 40}};
+//Polygon unreachable_polygon_4 = {{10, -10}, {-10, 40}, {30, 60}, {70, 40}, {40, -10}};
+
+
+std::vector<Polygon> unreachable_polygons_1 = {
+    {{-5, -5}, {60, -5}, {60, 60}, {-5, 60}},
+//    {{-20,-20}, {-25,-20}, {-25,-25}, {-20,-25}}
+//    {{-20,20}, {-25,20}, {-25,25}, {-20,25}}
+//    {{-20,20}, {-40,20}, {-40,40}, {-20,40}}
+//    {{-20,20}, {-80,20}, {-80,40}, {-20,40}} /* CW */
+    {{-20,20}, {-20,40}, {-180,40}, {-180,20}}, /* CCW */
+    {{80,20}, {240,20}, {240,40}, {80,40}} /* CCW */         
+//    {{-5,-5}, {-100,-5}, {-100,10}, {-5,10}}
+};
+
+std::vector<Polygon> unreachable_polygons_2 = {
+    {{-20, -20}, {170, -20}, {170, 86}, {85, 140}, {-20, 60} }
+};
+
+std::vector<Polygon> unreachable_polygons_3 = {
+    {{40, -10}, {90, 40}, {40, 90}, {-10, 40}},
+    {{-20,20}, {-20,40}, {-180,40}, {-180,20}}, /* CCW */
+    {{80,20}, {240,20}, {240,40}, {80,40}} /* CCW */             
+};
+
+std::vector<Polygon> unreachable_polygons_4 = {
+    {{10, -10}, {40, -10}, {70, 40}, {30, 60}, {-10, 40}}
+};
+
+
+void test_sequential_4(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing sequential 4 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T_times(z_context);
+    
+    for (int i = 0; i < 4; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < 4; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < polygon_1.points.size(); ++i)
+    {
+	string name = "t_time-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T_times.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+        
+    z3::set_param("parallel.enable", "true");    
+    //Z3_global_param_set("threads", "4");
+    z3::solver z_solver(z_context);    
+
+    vector<Polygon> polygons;
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    vector<Polygon> unreachable_polygons;
+    unreachable_polygons.push_back(unreachable_polygon_1);
+    unreachable_polygons.push_back(unreachable_polygon_2);
+    unreachable_polygons.push_back(unreachable_polygon_3);
+    unreachable_polygons.push_back(unreachable_polygon_4);    
+          
+    introduce_SequentialPolygonWeakNonoverlapping(z_solver,
+						  z_context,
+						  X_positions,
+						  Y_positions,
+						  T_times,
+						  polygons,
+						  unreachable_polygons);
+    introduce_TemporalOrdering(z_solver, z_context, T_times, 16, polygons);
+  
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+
+    /*
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+    */
+
+    int last_solvable_bounding_box_size = -1;
+    double poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y, poly_4_pos_x, poly_4_pos_y;
+    double time_1_t, time_2_t, time_3_t, time_4_t;
+
+    double _poly_1_pos_x, _poly_1_pos_y, _poly_2_pos_x, _poly_2_pos_y, _poly_3_pos_x, _poly_3_pos_y, _poly_4_pos_x, _poly_4_pos_y;
+    double _time_1_t, _time_2_t, _time_3_t, _time_4_t;    
+
+    //time_1_t = time_2_t = time_3_t = time_4_t = -1.0;
+
+    
+    for (int bounding_box_size = 200; bounding_box_size > 10; bounding_box_size -= 4)
+    {
+	printf("BB: %d\n", bounding_box_size);
+	z3::expr_vector bounding_box_assumptions(z_context);
+
+	assume_BedBoundingBox(X_positions[0], Y_positions[0], polygons[0], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[1], Y_positions[1], polygons[1], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[2], Y_positions[2], polygons[2], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[3], Y_positions[3], polygons[3], bounding_box_size, bounding_box_size, bounding_box_assumptions);		
+	
+	bool sat = false;
+	
+	switch (z_solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    printf("  SATISFIABLE\n");
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    printf("  UNSATISFIABLE\n");
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    printf("  UNKNOWN\n");
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+
+	if (sat)
+	{
+	    z3::model z_model(z_solver.get_model());
+	    /*
+	    printf("Printing model:\n");
+	    cout << z_model << "\n";
+	    */
+    
+	    printf("Printing interpretation:\n");    
+	    for (int i = 0; i < z_model.size(); ++i)
+	    {
+		printf("Variable:%s  ", z_model[i].name().str().c_str());
+		
+		cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+		double value = z_model.get_const_interp(z_model[i]).as_double();
+		printf("value: %.3f\n", value);	
+	    
+		if (z_model[i].name().str() == "x_pos-0")
+		{
+		    poly_1_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-0")
+		{
+		    poly_1_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-1")
+		{
+		    poly_2_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-1")
+		{
+		    poly_2_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-2")
+		{
+		    poly_3_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-2")
+		{
+		    poly_3_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "x_pos-3")
+		{
+		    poly_4_pos_x = value;
+		}
+		else if (z_model[i].name().str() == "y_pos-3")
+		{
+		    poly_4_pos_y = value;
+		}
+		else if (z_model[i].name().str() == "t_time-0")
+		{
+		    time_1_t = value;
+		}
+		else if (z_model[i].name().str() == "t_time-1")
+		{
+		    time_2_t = value;
+		}
+		else if (z_model[i].name().str() == "t_time-2")
+		{
+		    time_3_t = value;
+		}
+		else if (z_model[i].name().str() == "t_time-3")
+		{
+		    time_4_t = value;
+		}												
+	    }
+
+	    printf("Times: %.3f, %.3f, %.3f, %3f\n",
+		   time_1_t,
+		   time_2_t,
+		   time_3_t,
+		   time_4_t);
+	    
+	    printf("preRefined positions: %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f]\n",
+		   poly_1_pos_x,
+		   poly_1_pos_y,
+		   time_1_t,
+		   poly_2_pos_x,
+		   poly_2_pos_y,
+		   time_2_t,		   
+		   poly_3_pos_x,
+		   poly_3_pos_y,
+		   time_3_t,		   
+		   poly_4_pos_x,
+		   poly_4_pos_y,
+		   time_4_t);
+	    
+	    while (true)
+	    {
+		vector<Rational> dec_values_X;
+		dec_values_X.push_back(poly_1_pos_x);
+		dec_values_X.push_back(poly_2_pos_x);
+		dec_values_X.push_back(poly_3_pos_x);
+		dec_values_X.push_back(poly_4_pos_x);
+	    
+		vector<Rational> dec_values_Y;
+		dec_values_Y.push_back(poly_1_pos_y);
+		dec_values_Y.push_back(poly_2_pos_y);
+		dec_values_Y.push_back(poly_3_pos_y);
+		dec_values_Y.push_back(poly_4_pos_y);
+
+		vector<Rational> dec_values_T;
+		dec_values_T.push_back(time_1_t);
+		dec_values_T.push_back(time_2_t);
+		dec_values_T.push_back(time_3_t);
+		dec_values_T.push_back(time_4_t);
+
+		bool refined = refine_SequentialPolygonWeakNonoverlapping(z_solver,
+									  z_context,
+									  X_positions,
+									  Y_positions,
+									  T_times,
+									  dec_values_X,
+									  dec_values_Y,
+									  dec_values_T,
+									  polygons,
+									  unreachable_polygons);
+
+		bool refined_sat = false;
+
+		if (refined)
+		{
+		    printf("alpha 1\n");
+		    switch (z_solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {	    
+			printf("  sat\n");
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			printf("  unsat\n");
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			printf("  unknown\n");
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    printf("alpha 2: %d\n", (int)refined_sat);
+
+		    if (refined_sat)
+		    {
+			z3::model z_model(z_solver.get_model());
+			/*
+			printf("Printing model:\n");
+			cout << z_model << "\n";
+			*/
+    
+			for (int i = 0; i < z_model.size(); ++i)
+			{
+			    //printf("Variable:%s  ", z_model[i].name().str().c_str());
+			    double value = z_model.get_const_interp(z_model[i]).as_double();
+			
+			    if (z_model[i].name().str() == "x_pos-0")
+			    {
+				poly_1_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-0")
+			    {
+				poly_1_pos_y = value;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-1")
+			    {
+				poly_2_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-1")
+			    {
+				poly_2_pos_y = value;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-2")
+			    {
+				poly_3_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-2")
+			    {
+				poly_3_pos_y = value;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-3")
+			    {
+				poly_4_pos_x = value;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-3")
+			    {
+				poly_4_pos_y = value;
+			    }
+			    else if (z_model[i].name().str() == "t_time-0")
+			    {
+				time_1_t = value;
+			    }
+			    else if (z_model[i].name().str() == "t_time-1")
+			    {
+				time_2_t = value;
+			    }
+			    else if (z_model[i].name().str() == "t_time-2")
+			    {
+				time_3_t = value;
+			    }
+			    else if (z_model[i].name().str() == "t_time-3")
+			    {
+				time_4_t = value;
+			    }
+			}
+			printf("Refined positions: %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f]\n",
+			       poly_1_pos_x,
+			       poly_1_pos_y,
+			       time_1_t,
+			       poly_2_pos_x,
+			       poly_2_pos_y,
+			       time_2_t,		   
+			       poly_3_pos_x,
+			       poly_3_pos_y,
+			       time_3_t,		   
+			       poly_4_pos_x,
+			       poly_4_pos_y,
+			       time_4_t);
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    printf("-------------------------------------------------------------------\n");
+
+		    _poly_1_pos_x = poly_1_pos_x;
+		    _poly_1_pos_y = poly_1_pos_y;
+		    _time_1_t = time_1_t;
+		    _poly_2_pos_x = poly_2_pos_x;
+		    _poly_2_pos_y = poly_2_pos_y;
+		    _time_2_t = time_2_t;
+		    _poly_3_pos_x = poly_3_pos_x;
+		    _poly_3_pos_y = poly_3_pos_y;
+		    _time_3_t = time_3_t;
+		    _poly_4_pos_x = poly_4_pos_x;
+		    _poly_4_pos_y = poly_4_pos_y;
+		    _time_4_t = time_4_t;
+		    
+		    last_solvable_bounding_box_size = bounding_box_size;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}	
+		
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+    finish = clock();
+
+    printf("Solvable bounding box: %d\n", last_solvable_bounding_box_size);
+
+    printf("Final spatio-temporal positions: %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f]\n",
+	   _poly_1_pos_x,
+	   _poly_1_pos_y,
+	   _time_1_t,
+	   _poly_2_pos_x,
+	   _poly_2_pos_y,
+	   _time_2_t,		   
+	   _poly_3_pos_x,
+	   _poly_3_pos_y,
+	   _time_3_t,		   
+	   _poly_4_pos_x,
+	   _poly_4_pos_y,
+	   _time_4_t);			
+    
+    /*
+    for (int i = 0; i < 2; ++i)
+    {	
+	double value = X_positions[i];
+	printf("Orig X: %.3f\n", value);
+
+	value = Y_positions[i];
+	printf("Orig Y: %.3f\n", value);	
+    }
+    */
+    
+    SVG preview_svg("sequential_test_4.svg");
+
+    Polygon display_pro_polygon_1 = scale_UP(unreachable_polygons[0], _poly_1_pos_x, _poly_1_pos_y);
+    Polygon display_pro_polygon_2 = scale_UP(unreachable_polygons[1], _poly_2_pos_x, _poly_2_pos_y);
+    Polygon display_pro_polygon_3 = scale_UP(unreachable_polygons[2], _poly_3_pos_x, _poly_3_pos_y);
+    Polygon display_pro_polygon_4 = scale_UP(unreachable_polygons[3], _poly_4_pos_x, _poly_4_pos_y);
+
+    preview_svg.draw(display_pro_polygon_1, "lightgrey");
+    preview_svg.draw(display_pro_polygon_2, "lightgrey");
+    preview_svg.draw(display_pro_polygon_3, "lightgrey");
+    preview_svg.draw(display_pro_polygon_4, "lightgrey");
+    
+    Polygon display_polygon_1 = scale_UP(polygons[0], _poly_1_pos_x, _poly_1_pos_y);
+    Polygon display_polygon_2 = scale_UP(polygons[1], _poly_2_pos_x, _poly_2_pos_y);
+    Polygon display_polygon_3 = scale_UP(polygons[2], _poly_3_pos_x, _poly_3_pos_y);
+    Polygon display_polygon_4 = scale_UP(polygons[3], _poly_4_pos_x, _poly_4_pos_y);
+
+    preview_svg.draw(display_polygon_1, "green");
+    preview_svg.draw(display_polygon_2, "blue");
+    preview_svg.draw(display_polygon_3, "red");
+    preview_svg.draw(display_polygon_4, "grey");        
+    
+    preview_svg.Close();    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing sequential 4 ... finished\n");    
+}
+
+
+void test_sequential_5(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing sequential 5 ...\n");
+
+    start = clock();
+
+    z3::context z_context;    
+    z3::expr_vector X_positions(z_context);
+    z3::expr_vector Y_positions(z_context);
+    z3::expr_vector T_times(z_context);
+    
+    for (int i = 0; i < 4; ++i)
+    {
+	printf("i:%d\n", i);
+	string name = "x_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	X_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < 4; ++i)
+    {
+	string name = "y_pos-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	Y_positions.push_back(expr(z_context.real_const(name.c_str())));
+    }
+
+    for (int i = 0; i < polygon_1.points.size(); ++i)
+    {
+	string name = "t_time-" + to_string(i);
+	printf("name: %s\n", name.c_str());
+	
+	T_times.push_back(expr(z_context.real_const(name.c_str())));	
+    }
+    
+    z3::solver z_solver(z_context);
+    
+    Z3_global_param_set("parallel.enable", "false");    
+    //Z3_global_param_set("threads", "4");    
+
+    vector<Polygon> polygons;
+    polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    polygons.push_back(polygon_3);
+    polygons.push_back(polygon_4);
+
+    vector<vector<Polygon> > unreachable_polygons;
+    unreachable_polygons.push_back(unreachable_polygons_1);
+    unreachable_polygons.push_back(unreachable_polygons_2);
+    unreachable_polygons.push_back(unreachable_polygons_3);
+    unreachable_polygons.push_back(unreachable_polygons_4);
+
+    printf("pp: %ld\n", unreachable_polygons[0].size());
+    printf("pp: %ld\n", unreachable_polygons[1].size());
+    printf("pp: %ld\n", unreachable_polygons[2].size());
+    printf("pp: %ld\n", unreachable_polygons[3].size());
+          
+    introduce_SequentialPolygonWeakNonoverlapping(z_solver,
+						  z_context,
+						  X_positions,
+						  Y_positions,
+						  T_times,
+						  polygons,
+						  unreachable_polygons);
+    introduce_TemporalOrdering(z_solver, z_context, T_times, 16, polygons);
+  
+    printf("Printing solver status:\n");
+    cout << z_solver << "\n";
+
+    /*
+    printf("Printing smt status:\n");
+    cout << z_solver.to_smt2() << "\n";
+    */
+
+    int last_solvable_bounding_box_size = -1;
+    Rational poly_1_pos_x, poly_1_pos_y, poly_2_pos_x, poly_2_pos_y, poly_3_pos_x, poly_3_pos_y, poly_4_pos_x, poly_4_pos_y;
+    Rational time_1_t, time_2_t, time_3_t, time_4_t;
+
+    Rational _poly_1_pos_x, _poly_1_pos_y, _poly_2_pos_x, _poly_2_pos_y, _poly_3_pos_x, _poly_3_pos_y, _poly_4_pos_x, _poly_4_pos_y;
+    Rational _time_1_t, _time_2_t, _time_3_t, _time_4_t;    
+    
+    for (int bounding_box_size = 200; bounding_box_size > 10; bounding_box_size -= 4)
+    {
+	printf("BB: %d\n", bounding_box_size);
+	z3::expr_vector bounding_box_assumptions(z_context);
+
+	assume_BedBoundingBox(X_positions[0], Y_positions[0], polygons[0], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[1], Y_positions[1], polygons[1], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[2], Y_positions[2], polygons[2], bounding_box_size, bounding_box_size, bounding_box_assumptions);
+	assume_BedBoundingBox(X_positions[3], Y_positions[3], polygons[3], bounding_box_size, bounding_box_size, bounding_box_assumptions);		
+	
+	bool sat = false;
+	
+	switch (z_solver.check(bounding_box_assumptions))
+	{
+	case z3::sat:
+	{	    
+	    printf("  SATISFIABLE\n");
+	    sat = true;	    
+	    break;
+	}
+	case z3::unsat:	
+	{
+	    printf("  UNSATISFIABLE\n");
+	    sat = false;	    
+	    break;
+	}
+	case z3::unknown:
+	{
+	    printf("  UNKNOWN\n");
+	    break;
+	}
+	default:
+	{
+	    break;
+	}
+	}
+
+	if (sat)
+	{
+	    z3::model z_model(z_solver.get_model());
+
+	    /*
+	    printf("Printing model:\n");
+	    cout << z_model << "\n";
+	    */
+	    printf("Printing interpretation:\n");    
+	    for (int i = 0; i < z_model.size(); ++i)
+	    {
+		printf("Variable:%s  ", z_model[i].name().str().c_str());
+		
+		cout << z_model.get_const_interp(z_model[i]).as_double() << "\n";
+		double value = z_model.get_const_interp(z_model[i]).as_double();
+		printf("value: %.3f\n", value);
+
+		Rational rational(z_model.get_const_interp(z_model[i]).numerator().as_int64(), z_model.get_const_interp(z_model[i]).denominator().as_int64());
+	    
+		if (z_model[i].name().str() == "x_pos-0")
+		{
+		    poly_1_pos_x = rational;
+		}
+		else if (z_model[i].name().str() == "y_pos-0")
+		{
+		    poly_1_pos_y = rational;
+		}
+		else if (z_model[i].name().str() == "x_pos-1")
+		{
+		    poly_2_pos_x = rational;
+		}
+		else if (z_model[i].name().str() == "y_pos-1")
+		{
+		    poly_2_pos_y = rational;
+		}
+		else if (z_model[i].name().str() == "x_pos-2")
+		{
+		    poly_3_pos_x = rational;
+		}
+		else if (z_model[i].name().str() == "y_pos-2")
+		{
+		    poly_3_pos_y = rational;
+		}
+		else if (z_model[i].name().str() == "x_pos-3")
+		{
+		    poly_4_pos_x = rational;
+		}
+		else if (z_model[i].name().str() == "y_pos-3")
+		{
+		    poly_4_pos_y = rational;
+		}
+		else if (z_model[i].name().str() == "t_time-0")
+		{
+		    time_1_t = rational;
+		}
+		else if (z_model[i].name().str() == "t_time-1")
+		{
+		    time_2_t = rational;
+		}
+		else if (z_model[i].name().str() == "t_time-2")
+		{
+		    time_3_t = rational;
+		}
+		else if (z_model[i].name().str() == "t_time-3")
+		{
+		    time_4_t = rational;
+		}												
+	    }
+
+	    /*
+	    _poly_1_pos_x = poly_1_pos_x;
+	    _poly_1_pos_y = poly_1_pos_y;
+	    _time_1_t = time_1_t;
+	    _poly_2_pos_x = poly_2_pos_x;
+	    _poly_2_pos_y = poly_2_pos_y;
+	    _time_2_t = time_2_t;
+	    _poly_3_pos_x = poly_3_pos_x;
+	    _poly_3_pos_y = poly_3_pos_y;
+	    _time_3_t = time_3_t;
+	    _poly_4_pos_x = poly_4_pos_x;
+	    _poly_4_pos_y = poly_4_pos_y;
+	    _time_4_t = time_4_t;	    
+	    */
+
+	    printf("Times: %.3f, %.3f, %.3f, %3f\n",
+		   time_1_t.as_double(),
+		   time_2_t.as_double(),
+		   time_3_t.as_double(),
+		   time_4_t.as_double());
+	    
+	    printf("preRefined positions: %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f]\n",
+		   poly_1_pos_x.as_double(),
+		   poly_1_pos_y.as_double(),
+		   time_1_t.as_double(),
+		   poly_2_pos_x.as_double(),
+		   poly_2_pos_y.as_double(),
+		   time_2_t.as_double(),		   
+		   poly_3_pos_x.as_double(),
+		   poly_3_pos_y.as_double(),
+		   time_3_t.as_double(),		   
+		   poly_4_pos_x.as_double(),
+		   poly_4_pos_y.as_double(),
+		   time_4_t.as_double());
+	    
+	    while (true)
+	    {
+		vector<Rational> dec_values_X;
+		dec_values_X.push_back(poly_1_pos_x);
+		dec_values_X.push_back(poly_2_pos_x);
+		dec_values_X.push_back(poly_3_pos_x);
+		dec_values_X.push_back(poly_4_pos_x);
+	    
+		vector<Rational> dec_values_Y;
+		dec_values_Y.push_back(poly_1_pos_y);
+		dec_values_Y.push_back(poly_2_pos_y);
+		dec_values_Y.push_back(poly_3_pos_y);
+		dec_values_Y.push_back(poly_4_pos_y);
+
+		vector<Rational> dec_values_T;
+		dec_values_T.push_back(time_1_t);
+		dec_values_T.push_back(time_2_t);
+		dec_values_T.push_back(time_3_t);
+		dec_values_T.push_back(time_4_t);
+
+		bool refined = refine_SequentialPolygonWeakNonoverlapping(z_solver,
+									  z_context,
+									  X_positions,
+									  Y_positions,
+									  T_times,
+									  dec_values_X,
+									  dec_values_Y,
+									  dec_values_T,
+									  polygons,
+									  unreachable_polygons);
+
+		bool refined_sat = false;
+
+		if (refined)
+		{
+		    printf("alpha 1\n");
+		    switch (z_solver.check(bounding_box_assumptions))
+		    {
+		    case z3::sat:
+		    {	    
+			printf("  sat\n");
+			refined_sat = true;	    
+			break;
+		    }
+		    case z3::unsat:	
+		    {
+			printf("  unsat\n");
+			refined_sat = false;	    
+			break;
+		    }
+		    case z3::unknown:
+		    {
+			printf("  unknown\n");
+			break;
+		    }
+		    default:
+		    {
+			break;
+		    }
+		    }
+		    printf("alpha 2: %d\n", (int)refined_sat);
+
+		    if (refined_sat)
+		    {
+			z3::model z_model(z_solver.get_model());
+			/*
+			printf("Printing model:\n");
+			cout << z_model << "\n";
+			*/
+    
+			for (int i = 0; i < z_model.size(); ++i)
+			{
+			    printf("Variable:%s  ", z_model[i].name().str().c_str());
+			    double value = z_model.get_const_interp(z_model[i]).as_double();
+			    printf("value: %.3f\n", value);
+
+			    Rational rational(z_model.get_const_interp(z_model[i]).numerator().as_int64(), z_model.get_const_interp(z_model[i]).denominator().as_int64());			    
+			
+			    if (z_model[i].name().str() == "x_pos-0")
+			    {
+				poly_1_pos_x = rational;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-0")
+			    {
+				poly_1_pos_y = rational;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-1")
+			    {
+				poly_2_pos_x = rational;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-1")
+			    {
+				poly_2_pos_y = rational;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-2")
+			    {
+				poly_3_pos_x = rational;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-2")
+			    {
+				poly_3_pos_y = rational;
+			    }
+			    else if (z_model[i].name().str() == "x_pos-3")
+			    {
+				poly_4_pos_x = rational;
+			    }
+			    else if (z_model[i].name().str() == "y_pos-3")
+			    {
+				poly_4_pos_y = rational;
+			    }
+			    else if (z_model[i].name().str() == "t_time-0")
+			    {
+				time_1_t = rational;
+			    }
+			    else if (z_model[i].name().str() == "t_time-1")
+			    {
+				time_2_t = rational;
+			    }
+			    else if (z_model[i].name().str() == "t_time-2")
+			    {
+				time_3_t = rational;
+			    }
+			    else if (z_model[i].name().str() == "t_time-3")
+			    {
+				time_4_t = rational;
+			    }
+			}
+			printf("Refined positions: %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f]\n",
+			       poly_1_pos_x.as_double(),
+			       poly_1_pos_y.as_double(),
+			       time_1_t.as_double(),
+			       poly_2_pos_x.as_double(),
+			       poly_2_pos_y.as_double(),
+			       time_2_t.as_double(),		   
+			       poly_3_pos_x.as_double(),
+			       poly_3_pos_y.as_double(),
+			       time_3_t.as_double(),		   
+			       poly_4_pos_x.as_double(),
+			       poly_4_pos_y.as_double(),
+			       time_4_t.as_double());
+		    }
+		    else
+		    {
+			break;
+		    }
+		}
+		else
+		{
+		    printf("-------------------------------------------------------------------\n");
+
+		    _poly_1_pos_x = poly_1_pos_x;
+		    _poly_1_pos_y = poly_1_pos_y;
+		    _time_1_t = time_1_t;
+		    _poly_2_pos_x = poly_2_pos_x;
+		    _poly_2_pos_y = poly_2_pos_y;
+		    _time_2_t = time_2_t;
+		    _poly_3_pos_x = poly_3_pos_x;
+		    _poly_3_pos_y = poly_3_pos_y;
+		    _time_3_t = time_3_t;
+		    _poly_4_pos_x = poly_4_pos_x;
+		    _poly_4_pos_y = poly_4_pos_y;
+		    _time_4_t = time_4_t;
+		    
+		    last_solvable_bounding_box_size = bounding_box_size;
+		    break;
+		}
+	    }
+	}
+	else
+	{
+	    break;
+	}	
+		
+	//cout << float(z_model[i]) << "\n";
+        /*
+	switch (z_model.get_const_interp(z_model[i]).bool_value())
+	{
+	case Z3_L_FALSE:
+	{
+	    printf("   value: FALSE\n");
+	    break;
+	}
+	case Z3_L_TRUE:
+	{
+	    printf("   value: TRUE\n");
+	    break;
+	}
+	case Z3_L_UNDEF:
+	{
+	    printf("   value: UNDEF\n");
+		break;
+	}	    
+	default:
+	{
+		break;
+	}
+	}
+	*/
+    }
+    finish = clock();
+
+    printf("Solvable bounding box: %d\n", last_solvable_bounding_box_size);
+
+    printf("Final spatio-temporal positions: %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f], %.3f, %.3f [%.3f]\n",
+	   _poly_1_pos_x.as_double(),
+	   _poly_1_pos_y.as_double(),
+	   _time_1_t.as_double(),
+	   _poly_2_pos_x.as_double(),
+	   _poly_2_pos_y.as_double(),
+	   _time_2_t.as_double(),		   
+	   _poly_3_pos_x.as_double(),
+	   _poly_3_pos_y.as_double(),
+	   _time_3_t.as_double(),		   
+	   _poly_4_pos_x.as_double(),
+	   _poly_4_pos_y.as_double(),
+	   _time_4_t.as_double());			
+    
+    /*
+    for (int i = 0; i < 2; ++i)
+    {	
+	double value = X_positions[i].as_double();
+	printf("Orig X: %.3f\n", value);
+
+	value = Y_positions[i].as_double();
+	printf("Orig Y: %.3f\n", value);	
+    }
+    */
+    
+    SVG preview_svg("sequential_test_5.svg");
+
+    for (int i = 0; i < unreachable_polygons[0].size(); ++i)
+    {
+	Polygon display_pro_polygon_1 = scale_UP(unreachable_polygons[0][i], _poly_1_pos_x.as_double(), _poly_1_pos_y.as_double());
+	preview_svg.draw(display_pro_polygon_1, "lightgrey");
+    }
+
+    for (int i = 0; i < unreachable_polygons[1].size(); ++i)
+    {
+	Polygon display_pro_polygon_2 = scale_UP(unreachable_polygons[1][i], _poly_2_pos_x.as_double(), _poly_2_pos_y.as_double());
+	preview_svg.draw(display_pro_polygon_2, "lightgrey");    
+    }
+
+    for (int i = 0; i < unreachable_polygons[2].size(); ++i)
+    {    
+	Polygon display_pro_polygon_3 = scale_UP(unreachable_polygons[2][i], _poly_3_pos_x.as_double(), _poly_3_pos_y.as_double());
+	preview_svg.draw(display_pro_polygon_3, "lightgrey");	
+    }
+
+    for (int i = 0; i < unreachable_polygons[3].size(); ++i)
+    {        
+	Polygon display_pro_polygon_4 = scale_UP(unreachable_polygons[3][i], _poly_4_pos_x.as_double(), _poly_4_pos_y.as_double());
+	preview_svg.draw(display_pro_polygon_4, "lightgrey");	
+    }
+  
+    Polygon display_polygon_1 = scale_UP(polygons[0], _poly_1_pos_x.as_double(), _poly_1_pos_y.as_double());
+    Polygon display_polygon_2 = scale_UP(polygons[1], _poly_2_pos_x.as_double(), _poly_2_pos_y.as_double());
+    Polygon display_polygon_3 = scale_UP(polygons[2], _poly_3_pos_x.as_double(), _poly_3_pos_y.as_double());
+    Polygon display_polygon_4 = scale_UP(polygons[3], _poly_4_pos_x.as_double(), _poly_4_pos_y.as_double());
+
+    preview_svg.draw(display_polygon_1, "green");
+    preview_svg.draw(display_polygon_2, "blue");
+    preview_svg.draw(display_polygon_3, "red");
+    preview_svg.draw(display_polygon_4, "grey");        
+    
+    preview_svg.Close();    
+
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing sequential 5 ... finished\n");    
+}
+
+
+
+void test_sequential_6(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 6 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    vector<Polygon> polygons;
+    vector<Polygon> unreachable_polygons;
+    
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    /*
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygon_1);
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygon_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygon_3);   
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygon_4);
+    */
+
+/*
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(polygon_1);
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(polygon_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(polygon_3);   
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(polygon_4);
+*/
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygon_1);
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygon_2);
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygon_3);
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygon_4);
+    
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygon_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygon_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygon_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygon_4);    
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygon_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygon_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygon_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygon_4);    
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygon_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygon_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygon_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygon_4);    
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygon_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygon_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygon_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygon_4);
+
+    /*
+    for (int j = 0; j < unreachable_polygons_1.size(); ++j)
+    {
+	for (int k = 0; k < unreachable_polygons_1[j].points.size(); ++k)
+	{
+	    printf("    Ppxy: %d, %d\n", unreachable_polygons_1[j].points[k].x(), unreachable_polygons_1[j].points[k].y());
+	}
+    }
+    */
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;    
+    
+    /*
+    poly_positions_X.resize(polygons.size());
+    poly_positions_Y.resize(polygons.size());    
+    */    
+
+    do
+    {
+	decided_polygons.clear();
+	remaining_polygons.clear();
+
+	bool optimized = optimize_SubglobalSequentialPolygonNonoverlapping(solver_configuration,
+									   poly_positions_X,
+									   poly_positions_Y,
+									   times_T,
+									   polygons,
+									   unreachable_polygons,
+									   polygon_index_map,
+									   decided_polygons,
+									   remaining_polygons);
+
+	/*
+	bool optimized = optimize_SubglobalPolygonNonoverlapping(solver_configuration,
+								 poly_positions_X,
+								 poly_positions_Y,
+								 polygons,
+								 polygon_index_map,
+								 decided_polygons,
+								 remaining_polygons);	
+	*/
+	printf("----> Optimization finished <----\n");
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		// printf("  [%d] %.3f, %.3f (%.3f)\n", decided_polygons[i], poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double(), times_T[decided_polygons[i]].as_double());
+		printf("  [%d] %.3f, %.3f (%.3f)\n", decided_polygons[i], poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double(), times_T[decided_polygons[i]].as_double());		
+	    }
+	    printf("Remaining polygons: %ld\n", remaining_polygons.size());
+	    for (int i = 0; i < remaining_polygons.size(); ++i)
+	    {
+		printf("  %d\n", remaining_polygons[i]);
+	    }
+	
+	    SVG preview_svg("sequential_test_6.svg");
+
+	    if (!unreachable_polygons.empty())
+	    {
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    /*
+		    printf("----> %.3f,%.3f\n", poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double());		    
+		    for (int k = 0; k < polygons[decided_polygons[i]].points.size(); ++k)
+		    {
+			printf("    xy: %d, %d\n", polygons[decided_polygons[i]].points[k].x(), polygons[decided_polygons[i]].points[k].y());
+		    }
+		    */		    
+		    Polygon display_unreachable_polygon = scale_UP(unreachable_polygons[decided_polygons[i]],
+								  poly_positions_X[decided_polygons[i]].as_double(),
+								  poly_positions_Y[decided_polygons[i]].as_double());
+		    //if (decided_polygons[i] != 2)
+		    {
+			preview_svg.draw(display_unreachable_polygon, "lightgrey");
+		    }
+		}
+	    }	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		Polygon display_polygon = scale_UP(polygons[decided_polygons[i]],
+						   poly_positions_X[decided_polygons[i]].as_double(),
+						   poly_positions_Y[decided_polygons[i]].as_double());
+		
+		string color;
+		
+		switch(i)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+		case 7:
+		{
+		    color = "black";
+		    break;
+		}
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "aqua";
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}
+		
+		preview_svg.draw(display_polygon, color);
+	    }
+	    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}	
+	getchar();
+	
+	vector<Polygon> next_polygons;
+	vector<Polygon> next_unreachable_polygons;
+
+	for (int i = 0; i < polygon_index_map.size(); ++i)
+	{
+	    printf("  %d\n", polygon_index_map[i]);
+	}
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    polygon_index_map.push_back(index);
+	}
+    }
+    while (!remaining_polygons.empty());
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing sequential 6 ... finished\n");    
+}
+
+
+void test_sequential_7(void)
+{ 
+    clock_t start, finish;
+    
+    printf("Testing polygon 7 ...\n");
+
+    start = clock();
+
+    SolverConfiguration solver_configuration;
+
+    vector<Polygon> polygons;
+    vector<vector<Polygon> > unreachable_polygons;
+    
+    vector<int> remaining_polygons;
+    vector<int> polygon_index_map;
+    vector<int> decided_polygons;
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygons_1);
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygons_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygons_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygons_4);    
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygons_1);
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygons_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygons_3);
+    
+/*  
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygons_4);
+*/
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygons_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygons_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygons_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygons_4);    
+
+/*
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygons_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygons_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygons_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygons_4);
+    
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygons_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygons_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygons_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygons_4);    
+
+    polygons.push_back(polygon_1);
+    unreachable_polygons.push_back(unreachable_polygons_1);    
+    polygons.push_back(polygon_2);
+    unreachable_polygons.push_back(unreachable_polygons_2);    
+    polygons.push_back(polygon_3);
+    unreachable_polygons.push_back(unreachable_polygons_3);    
+    polygons.push_back(polygon_4);
+    unreachable_polygons.push_back(unreachable_polygons_4);
+*/
+    /*
+    for (int j = 0; j < unreachable_polygons_1.size(); ++j)
+    {
+	for (int k = 0; k < unreachable_polygons_1[j].points.size(); ++k)
+	{
+	    printf("    Ppxy: %d, %d\n", unreachable_polygons_1[j].points[k].x(), unreachable_polygons_1[j].points[k].y());
+	}
+    }
+    */
+
+    for (int index = 0; index < polygons.size(); ++index)
+    {
+	polygon_index_map.push_back(index);
+    }
+    
+    vector<Rational> poly_positions_X;
+    vector<Rational> poly_positions_Y;
+    vector<Rational> times_T;    
+    
+    /*
+    poly_positions_X.resize(polygons.size());
+    poly_positions_Y.resize(polygons.size());    
+    */    
+
+    do
+    {
+	decided_polygons.clear();
+	remaining_polygons.clear();
+	
+	bool optimized = optimize_SubglobalSequentialPolygonNonoverlapping(solver_configuration,
+									   poly_positions_X,
+									   poly_positions_Y,
+									   times_T,
+									   polygons,
+									   unreachable_polygons,
+									   polygon_index_map,
+									   decided_polygons,
+									   remaining_polygons);
+
+	printf("----> Optimization finished <----\n");
+	
+	if (optimized)
+	{
+	    printf("Polygon positions:\n");
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		printf("  [%d] %.3f, %.3f (%.3f)\n", decided_polygons[i], poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double(), times_T[decided_polygons[i]].as_double());
+	    }
+	    printf("Remaining polygons: %ld\n", remaining_polygons.size());
+	    for (int i = 0; i < remaining_polygons.size(); ++i)
+	    {
+		printf("  %d\n", remaining_polygons[i]);
+	    }
+	
+	    SVG preview_svg("sequential_test_7.svg");
+
+	    if (!unreachable_polygons.empty())
+	    {
+		for (int i = 0; i < decided_polygons.size(); ++i)
+		{
+		    /*
+		    printf("----> %.3f,%.3f\n", poly_positions_X[decided_polygons[i]].as_double(), poly_positions_Y[decided_polygons[i]].as_double());		    
+		    for (int k = 0; k < polygons[decided_polygons[i]].points.size(); ++k)
+		    {
+			printf("    xy: %d, %d\n", polygons[decided_polygons[i]].points[k].x(), polygons[decided_polygons[i]].points[k].y());
+		    }
+		    */		    
+		    for (int j = 0; j < unreachable_polygons[decided_polygons[i]].size(); ++j)
+		    {
+			/*
+			for (int k = 0; k < unreachable_polygons[decided_polygons[i]][j].points.size(); ++k)
+			{
+			    printf("    Pxy: %d, %d\n", unreachable_polygons[decided_polygons[i]][j].points[k].x(), unreachable_polygons[decided_polygons[i]][j].points[k].y());
+			}
+			*/
+			Polygon display_unreachable_polygon = scale_UP(unreachable_polygons[decided_polygons[i]][j],
+								      poly_positions_X[decided_polygons[i]].as_double(),
+								      poly_positions_Y[decided_polygons[i]].as_double());
+			preview_svg.draw(display_unreachable_polygon, "lightgrey");   
+		    }
+		}
+	    }	    
+
+	    for (int i = 0; i < decided_polygons.size(); ++i)
+	    {
+		Polygon display_polygon = scale_UP(polygons[decided_polygons[i]],
+						   poly_positions_X[decided_polygons[i]].as_double(),
+						   poly_positions_Y[decided_polygons[i]].as_double());
+		
+		string color;
+		
+		switch(i)
+		{
+		case 0:
+		{
+		    color = "green";
+		    break;
+		}
+		case 1:
+		{
+		    color = "blue";
+		    break;
+		}
+		case 2:
+		{
+		    color = "red";	    
+		    break;
+		}
+		case 3:
+		{
+		    color = "grey";	    
+		    break;
+		}
+		case 4:
+		{
+		    color = "cyan";
+		    break;
+		}
+		case 5:
+		{
+		    color = "magenta";
+		    break;
+		}
+		case 6:
+		{
+		    color = "yellow";
+		    break;
+		}
+		case 7:
+		{
+		    color = "black";
+		    break;
+		}
+		case 8:
+		{
+		    color = "indigo";
+		    break;
+		}
+		case 9:
+		{
+		    color = "olive";
+		    break;
+		}
+		case 10:
+		{
+		    color = "aqua";
+		    break;
+		}
+		case 11:
+		{
+		    color = "violet";
+		    break;
+		}			    	    	    
+		default:
+		{
+		    break;
+		}
+		}
+		
+		preview_svg.draw(display_polygon, color);
+	    }
+	    
+	    preview_svg.Close();
+	}
+	else
+	{
+	    printf("Polygon optimization FAILED.\n");
+	}
+	getchar();
+	
+	vector<Polygon> next_polygons;
+	vector<vector<Polygon> > next_unreachable_polygons;
+
+	for (int i = 0; i < polygon_index_map.size(); ++i)
+	{
+	    printf("  %d\n", polygon_index_map[i]);
+	}
+	for (int i = 0; i < remaining_polygons.size(); ++i)
+	{
+	    next_polygons.push_back(polygons[remaining_polygons[i]]);	    	    
+	    next_unreachable_polygons.push_back(unreachable_polygons[remaining_polygons[i]]);
+	}
+		
+	polygons.clear();
+	unreachable_polygons.clear();
+	polygon_index_map.clear();	
+	
+	polygons = next_polygons;
+	unreachable_polygons = next_unreachable_polygons;
+
+	for (int index = 0; index < polygons.size(); ++index)
+	{
+	    polygon_index_map.push_back(index);
+	}
+    }
+    while (!remaining_polygons.empty());
+
+    finish = clock();
+    
+    printf("Time: %.3f\n", (finish - start) / (double)CLOCKS_PER_SEC);
+    printf("Testing sequential 7 ... finished\n");    
+}    
+
+
+/*----------------------------------------------------------------*/
+
+int main(int SEQ_UNUSED(argc), char **SEQ_UNUSED(argv))
+{
+    // test_sequential_1();
+    // test_sequential_2();
+    // test_sequential_3();
+    // test_sequential_4();
+    // test_sequential_5();
+    // test_sequential_6();
+    test_sequential_7();    
+    
+    return 0;
+}
+
diff --git a/src/libseqarrange/test/seq_test_sequential.hpp b/src/libseqarrange/test/seq_test_sequential.hpp
new file mode 100644
index 0000000000..4ac36d7b5b
--- /dev/null
+++ b/src/libseqarrange/test/seq_test_sequential.hpp
@@ -0,0 +1,41 @@
+/*================================================================*/
+/*
+ * Author:  Pavel Surynek, 2023 - 2024
+ * Company: Prusa Research
+ *
+ * File:    seq_test_sequential.hpp
+ *
+ * Basic steel plate sequential object scheduling via SMT.
+ */
+/*================================================================*/
+
+#ifndef __SEQ_TEST_SEQUENTIAL_HPP__
+#define __SEQ_TEST_SEQUENTIAL_HPP__
+
+/*----------------------------------------------------------------*/
+
+/* Sequential arrangment test 1 */
+void test_sequential_1(void);
+
+/* Sequential arrangment test 2 */
+void test_sequential_2(void);
+
+/* Sequential arrangment test 3 */
+void test_sequential_3(void);
+
+/* Sequential arrangment test 4 */
+void test_sequential_4(void);
+
+/* Sequential arrangment test 5 */
+void test_sequential_5(void);
+
+/* Sequential arrangment test 6 */
+void test_sequential_6(void);
+
+/* Sequential arrangment test 7 */
+void test_sequential_7(void);
+
+
+/*----------------------------------------------------------------*/
+
+#endif /* __SEQ_TEST_SEQUENTIAL_HPP__ */