NEW: add tree_support_brim_width option

Jira: STUDIO-2921

Change-Id: Id5fddc0b6f5ffe3beb9afb0be5f81a766fc5b21e
(cherry picked from commit 86d7b6016e48143aad03744a58d44042ff0a0b4c)

src/libslic3r/Preset.cpp

@@ -740,7 +740,7 @@ static std::vector<std::string> s_Preset_print_options {
     "flush_into_infill", "flush_into_objects", "flush_into_support",
     // BBS
      "tree_support_branch_angle", "tree_support_wall_count", "tree_support_branch_distance",
-     "tree_support_branch_diameter",
+     "tree_support_branch_diameter","tree_support_brim_width",
      "detect_narrow_internal_solid_infill",
      "gcode_add_line_number", "enable_arc_fitting", "infill_combination", /*"adaptive_layer_height",*/
      "support_bottom_interface_spacing", "enable_overhang_speed", "overhang_1_4_speed", "overhang_2_4_speed", "overhang_3_4_speed", "overhang_4_4_speed",

src/libslic3r/PrintConfig.cpp

@@ -2790,6 +2790,16 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionInt(1));
 
+    def = this->add("tree_support_brim_width", coFloat);
+    def->label = L("Tree support brim width");
+    def->category = L("Support");
+    def->tooltip = L("The brim width around tree support. 0 means auto.");
+    def->sidetext = L("mm");
+    def->min = 0;
+    def->max = 100;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloat(0));
+
     def = this->add("nozzle_temperature", coInts);
     def->label = L("Other layers");
     def->tooltip = L("Nozzle temperature for layers after the initial one");

src/libslic3r/PrintConfig.hpp

@@ -685,6 +685,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloat,              tree_support_branch_diameter))
     ((ConfigOptionFloat,              tree_support_branch_angle))
     ((ConfigOptionInt,                tree_support_wall_count))
+    ((ConfigOptionFloat,              tree_support_brim_width))
     ((ConfigOptionBool,               detect_narrow_internal_solid_infill))
     // ((ConfigOptionBool,               adaptive_layer_height))
     ((ConfigOptionFloat,              support_bottom_interface_spacing))

src/libslic3r/PrintObject.cpp

@@ -770,6 +770,7 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "tree_support_branch_distance"
             || opt_key == "tree_support_branch_diameter"
             || opt_key == "tree_support_branch_angle"
+            || opt_key == "tree_support_brim_width"
             || opt_key == "tree_support_wall_count") {
             steps.emplace_back(posSupportMaterial);
         } else if (

src/libslic3r/TreeSupport.cpp

@@ -33,8 +33,6 @@
 namespace Slic3r
 {
 #define unscale_(val) ((val) * SCALING_FACTOR)
-#define FIRST_LAYER_EXPANSION 1.2
-
 
 inline unsigned int round_divide(unsigned int dividend, unsigned int divisor) //!< Return dividend divided by divisor rounded to the nearest integer
 {
@@ -2020,7 +2018,7 @@ void TreeSupport::draw_circles(const std::vector<std::vector<Node*>>& contact_no
 
     const bool with_lightning_infill = m_support_params.base_fill_pattern == ipLightning;
     coordf_t support_extrusion_width = m_support_params.support_extrusion_width;
-    const size_t wall_count = config.tree_support_wall_count.value;
+    const float tree_brim_width = config.tree_support_brim_width.value;
 
     const PrintObjectConfig& object_config = m_object->config();
     BOOST_LOG_TRIVIAL(info) << "draw_circles for object: " << m_object->model_object()->name;
@@ -2110,7 +2108,7 @@ void TreeSupport::draw_circles(const std::vector<std::vector<Node*>>& contact_no
                             }
                         }
                         if (layer_nr == 0 && m_raft_layers == 0) {
-                            double brim_width = layers_to_top * layer_height / (scale * branch_radius) * 0.5;
+                            double brim_width = tree_brim_width > 0 ? tree_brim_width : layers_to_top * layer_height / (scale * branch_radius) * 0.5;
                             circle = offset(circle, scale_(brim_width))[0];
                         }
                         area.emplace_back(ExPolygon(circle));