Multiple beds (part 1):

- create new bed when a volume is dragged into it
- limit maximum number of beds
- keep track of which ModelInstances are on which bed
- show list of beds and allow selecting an active one
- move objects from active bed to the first bed when passing Model to Print::apply (and back)

src/libslic3r/BuildVolume.cpp

@@ -21,6 +21,8 @@
 #include "libslic3r/Geometry/Circle.hpp"
 #include "libslic3r/Polygon.hpp"
 
+#include "MultipleBeds.hpp"
+
 namespace Slic3r {
 
 BuildVolume::BuildVolume(const std::vector<Vec2d> &bed_shape, const double max_print_height) : m_bed_shape(bed_shape), m_max_print_height(max_print_height)
@@ -284,8 +286,19 @@ BuildVolume::ObjectState object_state_templ(const indexed_triangle_set &its, con
     return inside ? (outside ? BuildVolume::ObjectState::Colliding : BuildVolume::ObjectState::Inside) : BuildVolume::ObjectState::Outside;
 }
 
-BuildVolume::ObjectState BuildVolume::object_state(const indexed_triangle_set& its, const Transform3f& trafo, bool may_be_below_bed, bool ignore_bottom) const
+BuildVolume::ObjectState BuildVolume::object_state(const indexed_triangle_set& its, const Transform3f& trafo_orig, bool may_be_below_bed, bool ignore_bottom, int* bed_idx) const
 {
+    ObjectState out = ObjectState::Outside;
+    if (bed_idx)
+        *bed_idx = -1;
+
+    for (int bed_id = 0; bed_id <= std::min(s_multiple_beds.get_number_of_beds(), s_multiple_beds.get_max_beds() - 1); ++bed_id) {
+
+
+
+    Transform3f trafo = trafo_orig;
+    trafo.pretranslate(-s_multiple_beds.get_bed_translation(bed_id).cast<float>());
+
     switch (m_type) {
     case Type::Rectangle:
     {
@@ -298,28 +311,48 @@ BuildVolume::ObjectState BuildVolume::object_state(const indexed_triangle_set& i
         // The following test correctly interprets intersection of a non-convex object with a rectangular build volume.
         //return rectangle_test(its, trafo, to_2d(build_volume.min), to_2d(build_volume.max), build_volume.max.z());
         //FIXME This test does NOT correctly interprets intersection of a non-convex object with a rectangular build volume.
-        return object_state_templ(its, trafo, may_be_below_bed, [build_volumef](const Vec3f &pt) { return build_volumef.contains(pt); });
+        out = object_state_templ(its, trafo, may_be_below_bed, [build_volumef](const Vec3f& pt) { return build_volumef.contains(pt); });
+        break;
     }
     case Type::Circle:
     {
         Geometry::Circlef circle { unscaled<float>(m_circle.center), unscaled<float>(m_circle.radius + SceneEpsilon) };
-        return m_max_print_height == 0.0 ? 
-            object_state_templ(its, trafo, may_be_below_bed, [circle](const Vec3f &pt) { return circle.contains(to_2d(pt)); }) :
-            object_state_templ(its, trafo, may_be_below_bed, [circle, z = m_max_print_height + SceneEpsilon](const Vec3f &pt) { return pt.z() < z && circle.contains(to_2d(pt)); });
+        out = m_max_print_height == 0.0 ?
+            object_state_templ(its, trafo, may_be_below_bed, [circle](const Vec3f& pt) { return circle.contains(to_2d(pt)); }) :
+            object_state_templ(its, trafo, may_be_below_bed, [circle, z = m_max_print_height + SceneEpsilon](const Vec3f& pt) { return pt.z() < z && circle.contains(to_2d(pt)); });
+        break;
     }
     case Type::Convex:
     //FIXME doing test on convex hull until we learn to do test on non-convex polygons efficiently.
     case Type::Custom:
-        return m_max_print_height == 0.0 ? 
-            object_state_templ(its, trafo, may_be_below_bed, [this](const Vec3f &pt) { return Geometry::inside_convex_polygon(m_top_bottom_convex_hull_decomposition_scene, to_2d(pt).cast<double>()); }) :
-            object_state_templ(its, trafo, may_be_below_bed, [this, z = m_max_print_height + SceneEpsilon](const Vec3f &pt) { return pt.z() < z && Geometry::inside_convex_polygon(m_top_bottom_convex_hull_decomposition_scene, to_2d(pt).cast<double>()); });
+        out = m_max_print_height == 0.0 ?
+            object_state_templ(its, trafo, may_be_below_bed, [this](const Vec3f& pt) { return Geometry::inside_convex_polygon(m_top_bottom_convex_hull_decomposition_scene, to_2d(pt).cast<double>()); }) :
+            object_state_templ(its, trafo, may_be_below_bed, [this, z = m_max_print_height + SceneEpsilon](const Vec3f& pt) { return pt.z() < z && Geometry::inside_convex_polygon(m_top_bottom_convex_hull_decomposition_scene, to_2d(pt).cast<double>()); });
+        break;
     case Type::Invalid:
     default:
-        return ObjectState::Inside;
+        out = ObjectState::Inside;
+        break;
     }
+
+    if (out != ObjectState::Outside) {
+        if (bed_id == s_multiple_beds.get_number_of_beds()) {
+            // The object is on the next bed to be added.
+            s_multiple_beds.request_next_bed(true);
+        }
+        if (bed_idx)
+            *bed_idx = bed_id;
+        break;
+    }    
+
+
+
+    }
+
+    return out;
 }
 
-BuildVolume::ObjectState BuildVolume::volume_state_bbox(const BoundingBoxf3& volume_bbox, bool ignore_bottom) const
+BuildVolume::ObjectState BuildVolume::volume_state_bbox(const BoundingBoxf3 volume_bbox_orig, bool ignore_bottom) const
 {
     assert(m_type == Type::Rectangle);
     BoundingBox3Base<Vec3d> build_volume = this->bounding_volume().inflated(SceneEpsilon);
@@ -327,9 +360,25 @@ BuildVolume::ObjectState BuildVolume::volume_state_bbox(const BoundingBoxf3& vol
         build_volume.max.z() = std::numeric_limits<double>::max();
     if (ignore_bottom)
         build_volume.min.z() = -std::numeric_limits<double>::max();
-    return build_volume.max.z() <= - SceneEpsilon ? ObjectState::Below :
+
+    ObjectState state = ObjectState::Outside;
+    int bed_idx = 0;
+    for (bed_idx = 0; bed_idx <= std::min(s_multiple_beds.get_number_of_beds(), s_multiple_beds.get_max_beds() - 1); ++bed_idx) {
+        BoundingBoxf3 volume_bbox = volume_bbox_orig;
+        volume_bbox.translate(-s_multiple_beds.get_bed_translation(bed_idx));
+
+        state = build_volume.max.z() <= -SceneEpsilon ? ObjectState::Below :
             build_volume.contains(volume_bbox) ? ObjectState::Inside :
             build_volume.intersects(volume_bbox) ? ObjectState::Colliding : ObjectState::Outside;
+        if (state != ObjectState::Outside)
+            break;
+    }
+
+    if (bed_idx == s_multiple_beds.get_number_of_beds()) {
+        // The object is on the next bed to be added.
+        s_multiple_beds.request_next_bed(true);
+    }
+    return state;
 }
 
 bool BuildVolume::all_paths_inside(const GCodeProcessorResult& paths, const BoundingBoxf3& paths_bbox, bool ignore_bottom) const

src/libslic3r/BuildVolume.hpp

@@ -89,10 +89,10 @@ public:
     // Called by Plater to update Inside / Colliding / Outside state of ModelObjects before slicing.
     // Called from Model::update_print_volume_state() -> ModelObject::update_instances_print_volume_state()
     // Using SceneEpsilon
-    ObjectState  object_state(const indexed_triangle_set &its, const Transform3f &trafo, bool may_be_below_bed, bool ignore_bottom = true) const;
+    ObjectState  object_state(const indexed_triangle_set &its, const Transform3f& trafo, bool may_be_below_bed, bool ignore_bottom = true, int* bed_idx = nullptr) const;
     // Called by GLVolumeCollection::check_outside_state() after an object is manipulated with gizmos for example.
     // Called for a rectangular bed:
-    ObjectState  volume_state_bbox(const BoundingBoxf3& volume_bbox, bool ignore_bottom = true) const;
+    ObjectState  volume_state_bbox(BoundingBoxf3 volume_bbox, bool ignore_bottom = true) const;
 
     // 2) Test called on G-code paths.
     // Using BedEpsilon for all tests.

src/libslic3r/CMakeLists.txt

@@ -445,6 +445,8 @@ set(SLIC3R_SOURCES
     miniz_extension.hpp
     miniz_extension.cpp
     MarchingSquares.hpp
+    MultipleBeds.cpp
+    MultipleBeds.hpp
     Execution/Execution.hpp
     Execution/ExecutionSeq.hpp
     Execution/ExecutionTBB.hpp

src/libslic3r/Model.cpp

@@ -21,6 +21,7 @@
 #include "MTUtils.hpp"
 #include "TriangleMeshSlicer.hpp"
 #include "TriangleSelector.hpp"
+#include "MultipleBeds.hpp"
 
 #include "Format/AMF.hpp"
 #include "Format/OBJ.hpp"
@@ -374,8 +375,10 @@ double Model::max_z() const
 unsigned int Model::update_print_volume_state(const BuildVolume &build_volume)
 {
     unsigned int num_printable = 0;
+    s_multiple_beds.clear_inst_map();
     for (ModelObject* model_object : this->objects)
         num_printable += model_object->update_instances_print_volume_state(build_volume);
+    s_multiple_beds.inst_map_updated();
     return num_printable;
 }
 
@@ -1594,11 +1597,12 @@ unsigned int ModelObject::update_instances_print_volume_state(const BuildVolume
         OUTSIDE = 2
     };
     for (ModelInstance* model_instance : this->instances) {
+        int bed_idx = -1;
         unsigned int inside_outside = 0;
         for (const ModelVolume* vol : this->volumes)
             if (vol->is_model_part()) {
                 const Transform3d matrix = model_instance->get_matrix() * vol->get_matrix();
-                BuildVolume::ObjectState state = build_volume.object_state(vol->mesh().its, matrix.cast<float>(), true /* may be below print bed */);
+                BuildVolume::ObjectState state = build_volume.object_state(vol->mesh().its, matrix.cast<float>(), true /* may be below print bed */, true /*ignore_bottom*/, &bed_idx);
                 if (state == BuildVolume::ObjectState::Inside)
                     // Volume is completely inside.
                     inside_outside |= INSIDE;
@@ -1617,6 +1621,7 @@ unsigned int ModelObject::update_instances_print_volume_state(const BuildVolume
             inside_outside == INSIDE ? ModelInstancePVS_Inside : ModelInstancePVS_Fully_Outside;
         if (inside_outside == INSIDE)
             ++num_printable;
+        s_multiple_beds.set_instance_bed(model_instance->id(), bed_idx);
     }
     return num_printable;
 }

src/libslic3r/MultipleBeds.cpp

@@ -0,0 +1,117 @@
+#include "MultipleBeds.hpp"
+
+#include "BuildVolume.hpp"
+#include "Model.hpp"
+
+#include <cassert>
+
+namespace Slic3r {
+
+MultipleBeds s_multiple_beds;
+
+
+Vec3d MultipleBeds::get_bed_translation(int id) const
+{
+    // TODO: Arrange defines this in LogicalBedGap in SceneBuilder.cpp
+    // TODO: It should be defined as multiple of bed size.
+
+    if (id == 0)
+        return Vec3d::Zero();
+    int x = 0;
+    int y = 0;
+#if 0
+    // Linear layout
+    x = id;
+#else
+    // Grid layout.
+    ++id;
+    int a = 1;
+    while ((a+1)*(a+1) < id)
+        ++a;
+    id = id - a*a;
+    x=a;
+    y=a;
+    if (id <= a)
+        y = id-1;
+    else
+        x=id-a-1;
+#endif
+    return 300. * Vec3d(x, y, 0.);
+}
+
+
+
+
+
+void MultipleBeds::clear_inst_map()
+{
+    m_inst_to_bed.clear();
+}
+
+void MultipleBeds::set_instance_bed(ObjectID id, int bed_idx)
+{
+    assert(bed_idx < get_max_beds());
+    m_inst_to_bed[id] = bed_idx;
+}
+
+void MultipleBeds::inst_map_updated()
+{
+    int max_bed_idx = 0;
+    for (const auto& [obj_id, bed_idx] : m_inst_to_bed)
+        max_bed_idx = std::max(max_bed_idx, bed_idx);
+
+    if (m_number_of_beds != max_bed_idx + 1) {
+        m_number_of_beds = max_bed_idx + 1;
+        m_active_bed = m_number_of_beds - 1;
+        request_next_bed(false);
+    }
+    if (m_active_bed >= m_number_of_beds)
+        m_active_bed = m_number_of_beds - 1;
+}
+
+void MultipleBeds::request_next_bed(bool show)
+{
+    m_show_next_bed = (get_number_of_beds() < get_max_beds() ? show : false);
+}
+
+void MultipleBeds::set_active_bed(int i)
+{
+    assert(i < get_max_beds());
+    if (i<m_number_of_beds)
+        m_active_bed = i;
+}
+
+void MultipleBeds::move_active_to_first_bed(Model& model, const BuildVolume& build_volume, bool to_or_from) const
+{
+    static std::vector<std::pair<Vec3d, bool>> old_state;
+    size_t i = 0;
+    assert(! to_or_from || old_state.empty());
+
+    for (ModelObject* mo : model.objects) {
+        for (ModelInstance* mi : mo->instances) {
+            if (to_or_from) {
+                old_state.resize(i+1);
+                old_state[i] = std::make_pair(mi->get_offset(), mi->printable);
+                if (this->is_instance_on_active_bed(mi->id()))
+                    mi->set_offset(mi->get_offset() - get_bed_translation(get_active_bed()));
+                else
+                    mi->printable = false;
+            } else {
+                mi->set_offset(old_state[i].first);
+                mi->printable = old_state[i].second;
+            }
+            ++i;
+        }
+    }
+    if (! to_or_from)
+        old_state.clear();
+}
+
+
+bool MultipleBeds::is_instance_on_active_bed(ObjectID id) const
+{
+    auto it = m_inst_to_bed.find(id);
+    return (it != m_inst_to_bed.end() && it->second == m_active_bed);
+}
+
+}

src/libslic3r/MultipleBeds.hpp

@@ -0,0 +1,56 @@
+#ifndef libslic3r_MultipleBeds_hpp_
+#define libslic3r_MultipleBeds_hpp_
+
+#include "libslic3r/ObjectID.hpp"
+#include "libslic3r/Point.hpp"
+#include "libslic3r/BoundingBox.hpp"
+
+#include <map>
+
+namespace Slic3r {
+
+class Model;
+class BuildVolume;
+
+
+class MultipleBeds {
+public:
+	MultipleBeds() = default;
+
+	static constexpr int get_max_beds() { return MAX_NUMBER_OF_BEDS; };
+	Vec3d get_bed_translation(int id) const;
+
+	void   clear_inst_map();
+	void   set_instance_bed(ObjectID id, int bed_idx);
+	void   inst_map_updated();
+
+	int    get_number_of_beds() const   { return m_number_of_beds; }
+	bool   should_show_next_bed() const { return m_show_next_bed; }
+	void   request_next_bed(bool show);
+	int    get_active_bed() const       { return m_active_bed; }
+	
+	void   set_active_bed(int i);
+	void   move_active_to_first_bed(Model& model, const BuildVolume& build_volume, bool to_or_from) const;
+
+
+
+private:
+	bool   is_instance_on_active_bed(ObjectID id) const;
+
+
+
+	int m_number_of_beds = 1;
+	int m_active_bed     = 0;
+	bool m_show_next_bed = false;
+	std::map<ObjectID, int> m_inst_to_bed;
+	
+};
+
+extern MultipleBeds s_multiple_beds;
+
+
+
+
+} // namespace Slic3r
+
+#endif // libslic3r_MultipleBeds_hpp_

src/libslic3r/libslic3r.h

@@ -115,6 +115,8 @@ using deque =
 template<typename T, typename Q>
 inline T unscale(Q v) { return T(v) * T(SCALING_FACTOR); }
 
+constexpr size_t MAX_NUMBER_OF_BEDS = 9;
+
 enum Axis { 
 	X=0,
 	Y,

src/slic3r/GUI/3DBed.cpp

@@ -13,6 +13,7 @@
 #include "libslic3r/Geometry/Circle.hpp"
 #include "libslic3r/Tesselate.hpp"
 #include "libslic3r/PresetBundle.hpp"
+#include "libslic3r/MultipleBeds.hpp"
 
 #include "GUI_App.hpp"
 #include "GLCanvas3D.hpp"
@@ -105,22 +106,29 @@ bool Bed3D::set_shape(const Pointfs& bed_shape, const double max_print_height, c
 
 void Bed3D::render(GLCanvas3D& canvas, const Transform3d& view_matrix, const Transform3d& projection_matrix, bool bottom, float scale_factor, bool show_texture)
 {
-    render_internal(canvas, view_matrix, projection_matrix, bottom, scale_factor, show_texture, false);
+    for (size_t i = 0; i < s_multiple_beds.get_number_of_beds() + int(s_multiple_beds.should_show_next_bed()); ++i) {
+        Transform3d mat = view_matrix;
+        mat.translate(s_multiple_beds.get_bed_translation(i));
+        bool is_active = (i == s_multiple_beds.get_active_bed() && s_multiple_beds.get_number_of_beds() != 1);
+        render_internal(canvas, mat, projection_matrix, bottom, scale_factor, show_texture, false, is_active);
+    }
 }
 
 void Bed3D::render_for_picking(GLCanvas3D& canvas, const Transform3d& view_matrix, const Transform3d& projection_matrix, bool bottom, float scale_factor)
 {
-    render_internal(canvas, view_matrix, projection_matrix, bottom, scale_factor, false, true);
+    render_internal(canvas, view_matrix, projection_matrix, bottom, scale_factor, false, true, false);
 }
 
 void Bed3D::render_internal(GLCanvas3D& canvas, const Transform3d& view_matrix, const Transform3d& projection_matrix, bool bottom, float scale_factor,
-    bool show_texture, bool picking)
+    bool show_texture, bool picking, bool active)
 {
     m_scale_factor = scale_factor;
 
     glsafe(::glEnable(GL_DEPTH_TEST));
 
     m_model.model.set_color(picking ? PICKING_MODEL_COLOR : DEFAULT_MODEL_COLOR);
+    if (!picking && ! active)
+        m_model.model.set_color(ColorRGBA(.6f, .6f, 0.6f, 0.5f));
 
     switch (m_type)
     {

src/slic3r/GUI/3DBed.hpp

@@ -86,7 +86,7 @@ private:
     void init_contourlines();
     static std::tuple<Type, std::string, std::string> detect_type(const Pointfs& shape);
     void render_internal(GLCanvas3D& canvas, const Transform3d& view_matrix, const Transform3d& projection_matrix, bool bottom, float scale_factor,
-        bool show_texture, bool picking);
+        bool show_texture, bool picking, bool active);
     void render_system(GLCanvas3D& canvas, const Transform3d& view_matrix, const Transform3d& projection_matrix, bool bottom, bool show_texture);
     void render_texture(bool bottom, GLCanvas3D& canvas, const Transform3d& view_matrix, const Transform3d& projection_matrix);
     void render_model(const Transform3d& view_matrix, const Transform3d& projection_matrix);

src/slic3r/GUI/GLCanvas3D.cpp

@@ -21,6 +21,7 @@
 #include "libslic3r/Geometry/ConvexHull.hpp"
 #include "libslic3r/ExtrusionEntity.hpp"
 #include "libslic3r/Layer.hpp"
+#include "libslic3r/MultipleBeds.hpp"
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/Technologies.hpp"
 #include "libslic3r/Tesselate.hpp"
@@ -1457,6 +1458,7 @@ bool GLCanvas3D::check_volumes_outside_state(GLVolumeCollection& volumes, ModelI
     bool contained_min_one = false;
 
     const Slic3r::BuildVolume& build_volume = m_bed.build_volume();
+    s_multiple_beds.request_next_bed(false);
 
     const std::vector<unsigned int> volumes_idxs = volumes_to_process_idxs();
     for (unsigned int vol_idx : volumes_idxs) {
@@ -1828,6 +1830,26 @@ void GLCanvas3D::render()
     if (show_imgui_demo_window) ImGui::ShowDemoWindow();
 #endif // SHOW_IMGUI_DEMO_WINDOW
 
+
+    {
+        if (s_multiple_beds.get_number_of_beds() != 1) {
+            ImGui::SetNextWindowPos(ImVec2(10,10));
+            ImGui::SetNextWindowSize(ImVec2(120., 150.));
+            ImGui::Begin("Bed selector", 0, ImGuiWindowFlags_NoResize);
+            for (int i = 0; i < s_multiple_beds.get_number_of_beds(); ++i) {
+                bool inactive = i != s_multiple_beds.get_active_bed();
+                if (inactive)
+                    ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(0., 0., 0., .5));
+                if (ImGui::Button((std::string("Bed number ") + std::to_string(i + 1)).c_str()))
+                    s_multiple_beds.set_active_bed(i);
+                if (inactive)
+                    ImGui::PopStyleColor();
+            }
+            ImGui::End();
+        }
+    }
+
+
     const bool is_looking_downward = camera.is_looking_downward();
 
     // draw scene
@@ -5341,9 +5363,20 @@ BoundingBoxf3 GLCanvas3D::_max_bounding_box(bool include_gizmos, bool include_be
         bb.merge(BoundingBoxf3(sel_bb_center - extend_by, sel_bb_center + extend_by));
     }
 
-    const BoundingBoxf3 bed_bb = include_bed_model ? m_bed.extended_bounding_box() : m_bed.build_volume().bounding_volume();
+    
+
+    const BoundingBoxf3 first_bed_bb = include_bed_model ? m_bed.extended_bounding_box() : m_bed.build_volume().bounding_volume();
+    BoundingBoxf3 bed_bb = first_bed_bb;
+    
+    for (int i = 0; i < s_multiple_beds.get_number_of_beds() + int(s_multiple_beds.should_show_next_bed()); ++i) {
+        BoundingBoxf3 this_bed = first_bed_bb;
+        this_bed.translate(s_multiple_beds.get_bed_translation(i));
+        bed_bb.merge(this_bed);
+    }
     bb.merge(bed_bb);
     
+    
+
     if (!m_main_toolbar.is_enabled())
         bb.merge(m_gcode_viewer.get_max_bounding_box());
 

src/slic3r/GUI/Plater.cpp

@@ -73,6 +73,7 @@
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/miniz_extension.hpp"
+#include "libslic3r/MultipleBeds.hpp"
 
 // For stl export
 #include "libslic3r/CSGMesh/ModelToCSGMesh.hpp"
@@ -2142,10 +2143,17 @@ unsigned int Plater::priv::update_background_process(bool force_validation, bool
     background_process_timer.Stop();
     // Update the "out of print bed" state of ModelInstances.
     update_print_volume_state();
+
+    // Move all instances according to their active bed:
+    s_multiple_beds.move_active_to_first_bed(q->model(), q->build_volume(), true);
+
     // Apply new config to the possibly running background task.
     bool               was_running = background_process.running();
     Print::ApplyStatus invalidated = background_process.apply(q->model(), full_config);
 
+    // Move all instances back to their respective beds.
+    s_multiple_beds.move_active_to_first_bed(q->model(), q->build_volume(), false);
+
     // Just redraw the 3D canvas without reloading the scene to consume the update of the layer height profile.
     if (view3D->is_layers_editing_enabled())
         view3D->get_wxglcanvas()->Refresh();