Pillar config (#4410)

Implements workaround for #4407 

* Added support for pillar size configuration.
* Pillars UI fix
* Pillar configuration fix
* Fixed misspelled variable name.
* Strings are not numbers.
* Fixed pillar spacing label.

lib/Slic3r/GUI/PresetEditor.pm

@@ -458,6 +458,7 @@ sub options {
         support_material support_material_threshold support_material_max_layers support_material_enforce_layers
         raft_layers
         support_material_pattern support_material_spacing support_material_angle
+        support_material_pillar_size support_material_pillar_spacing
         support_material_interface_layers support_material_interface_spacing
         support_material_contact_distance support_material_buildplate_only dont_support_bridges
         notes
@@ -612,6 +613,8 @@ sub build {
             $optgroup->append_single_option_line('support_material_pattern');
             $optgroup->append_single_option_line('support_material_spacing');
             $optgroup->append_single_option_line('support_material_angle');
+            $optgroup->append_single_option_line('support_material_pillar_size');
+            $optgroup->append_single_option_line('support_material_pillar_spacing');
             $optgroup->append_single_option_line('support_material_interface_layers');
             $optgroup->append_single_option_line('support_material_interface_spacing');
             $optgroup->append_single_option_line('support_material_buildplate_only');
@@ -939,6 +942,7 @@ sub _update {
     
     my $have_support_material = $config->support_material || $config->raft_layers > 0;
     my $have_support_interface = $config->support_material_interface_layers > 0;
+    my $have_support_pillars = $have_support_material && $config->support_material_pattern eq 'pillars';
     $self->get_field($_)->toggle($have_support_material)
         for qw(support_material_threshold support_material_pattern 
             support_material_spacing support_material_angle
@@ -950,6 +954,10 @@ sub _update {
     $self->get_field($_)->toggle($config->support_material)
         for qw(support_material_max_layers);
     
+    # Only enable pillar configuration when using pillars
+    $self->get_field($_)->toggle($have_support_pillars)
+        for qw(support_material_pillar_size support_material_pillar_spacing);
+
     $self->get_field($_)->toggle($have_support_material && $have_support_interface)
         for qw(support_material_interface_spacing support_material_interface_extruder
             support_material_interface_speed);

lib/Slic3r/Print/SupportMaterial.pm

@@ -22,10 +22,6 @@ use constant DEBUG_CONTACT_ONLY => 0;
 # increment used to reach MARGIN in steps to avoid trespassing thin objects
 use constant MARGIN_STEP => MARGIN/3;
 
-# generate a tree-like structure to save material
-use constant PILLAR_SIZE    => 2.5;
-use constant PILLAR_SPACING => 10;
-
 sub generate {
     # $object is Slic3r::Print::Object
     my ($self, $object) = @_;
@@ -911,8 +907,8 @@ sub generate_pillars_shape {
     # this prevents supplying an empty point set to BoundingBox constructor
     return if !%$contact;
     
-    my $pillar_size     = scale PILLAR_SIZE;
+    my $pillar_size     = scale $self->object_config->support_material_pillar_size;
-    my $pillar_spacing  = scale PILLAR_SPACING;
+    my $pillar_spacing  = scale $self->object_config->support_material_pillar_spacing;
     
     my $grid;  # arrayref of polygons
     {

slic3r.pl

@@ -486,6 +486,10 @@ $j
                         Pattern to use for support material (default: $config->{support_material_pattern})
     --support-material-spacing
                         Spacing between pattern lines (mm, default: $config->{support_material_spacing})
+    --support-material-pillar-size
+                        Size of the pillars in the pillar support pattern (default: $config->{support_material_pillar_size})
+    --support-material-pillar-spacing
+                        Spacing between the pillars in the pillar support pattern (default: $config->{support_material_pillar_spacing})
     --support-material-angle
                         Support material angle in degrees (range: 0-90, default: $config->{support_material_angle})
     --support-material-contact-distance

xs/src/libslic3r/PrintConfig.cpp

@@ -1502,6 +1502,24 @@ PrintConfigDef::PrintConfigDef()
     def->enum_labels.push_back("pillars");
     def->default_value = new ConfigOptionEnum<SupportMaterialPattern>(smpPillars);
 
+    def = this->add("support_material_pillar_size", coFloat);
+    def->label = "Pillar size";
+    def->category = "Support material";
+    def->tooltip = "Size of the pillars in the pillar support pattern";
+    def->sidetext = "mm";
+    def->cli = "support-material-pillar-size=f";
+    def->min = 0;
+    def->default_value = new ConfigOptionFloat(2.5);
+
+    def = this->add("support_material_pillar_spacing", coFloat);
+    def->label = "Pillar spacing";
+    def->category = "Support material";
+    def->tooltip = "Spacing between pillars in the pillar support pattern";
+    def->sidetext = "mm";
+    def->cli = "support-material-pillar-spacing=f";
+    def->min = 0;
+    def->default_value = new ConfigOptionFloat(10);
+
     def = this->add("support_material_spacing", coFloat);
     def->label = "Pattern spacing";
     def->category = "Support material";

xs/src/libslic3r/PrintConfig.hpp

@@ -181,6 +181,8 @@ class PrintObjectConfig : public virtual StaticPrintConfig
     ConfigOptionFloat               support_material_interface_spacing;
     ConfigOptionFloatOrPercent      support_material_interface_speed;
     ConfigOptionEnum<SupportMaterialPattern> support_material_pattern;
+    ConfigOptionFloat               support_material_pillar_size;
+    ConfigOptionFloat               support_material_pillar_spacing;
     ConfigOptionFloat               support_material_spacing;
     ConfigOptionFloat               support_material_speed;
     ConfigOptionFloatOrPercent      support_material_threshold;
@@ -219,6 +221,8 @@ class PrintObjectConfig : public virtual StaticPrintConfig
         OPT_PTR(support_material_interface_spacing);
         OPT_PTR(support_material_interface_speed);
         OPT_PTR(support_material_pattern);
+        OPT_PTR(support_material_pillar_size);
+        OPT_PTR(support_material_pillar_spacing);
         OPT_PTR(support_material_spacing);
         OPT_PTR(support_material_speed);
         OPT_PTR(support_material_threshold);

xs/src/libslic3r/PrintObject.cpp

@@ -251,6 +251,8 @@ PrintObject::invalidate_state_by_config(const PrintConfigBase &config)
             || opt_key == "support_material_pattern"
             || opt_key == "support_material_spacing"
             || opt_key == "support_material_threshold"
+            || opt_key == "support_material_pillar_size"
+            || opt_key == "support_material_pillar_spacing"
             || opt_key == "dont_support_bridges") {
             steps.insert(posSupportMaterial);
         } else if (opt_key == "interface_shells"