Add max_weight_on_model parameter

Limiting the weight of subtrees going to the model body

src/libslic3r/Preset.cpp

@@ -501,6 +501,7 @@ static std::vector<std::string> s_Preset_sla_print_options {
     "support_pillar_diameter",
     "support_small_pillar_diameter_percent",
     "support_max_bridges_on_pillar",
+    "support_max_weight_on_model",
     "support_pillar_connection_mode",
     "support_buildplate_only",
     "support_pillar_widening_factor",

src/libslic3r/PrintConfig.cpp

@@ -3676,6 +3676,17 @@ void PrintConfigDef::init_sla_params()
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionInt(3));
 
+    def = this->add("support_max_weight_on_model", coFloat);
+    def->label = L("Max weight on model");
+    def->category = L("Supports");
+    def->tooltip  = L(
+         "Maximum weight of sub-trees that terminate on the model instead of the print bed. The weight is the sum of the lenghts of all "
+          "branches emanating from the endpoint.");
+    def->sidetext = L("mm");
+    def->min = 0;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionFloat(10.));
+
     def = this->add("support_pillar_connection_mode", coEnum);
     def->label = L("Pillar connection mode");
     def->tooltip = L("Controls the bridge type between two neighboring pillars."

src/libslic3r/PrintConfig.hpp

@@ -861,6 +861,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     // Generate only ground facing supports
     ((ConfigOptionBool, support_buildplate_only))
 
+    ((ConfigOptionFloat, support_max_weight_on_model))
+
     // TODO: unimplemented at the moment. This coefficient will have an impact
     // when bridges and pillars are merged. The resulting pillar should be a bit
     // thicker than the ones merging into it. How much thicker? I don't know

src/libslic3r/SLA/BranchingTreeSLA.cpp

@@ -272,6 +272,9 @@ bool BranchingTreeBuilder::add_ground_bridge(const branchingtree::Node &from,
 bool BranchingTreeBuilder::add_mesh_bridge(const branchingtree::Node &from,
                                            const branchingtree::Node &to)
 {
+    if (from.weight > m_sm.cfg.max_weight_on_model_support)
+        return false;
+
     sla::Junction fromj = {from.pos.cast<double>(), get_radius(from)};
 
     auto anchor = m_sm.cfg.ground_facing_only ?

src/libslic3r/SLA/SupportTree.hpp

@@ -76,7 +76,9 @@ struct SupportTreeConfig
     double pillar_base_safety_distance_mm = 0.5;
     
     unsigned max_bridges_on_pillar = 3;
-    
+
+    double max_weight_on_model_support = 10.f;
+
     double head_fullwidth() const {
         return 2 * head_front_radius_mm + head_width_mm +
                2 * head_back_radius_mm - head_penetration_mm;

src/libslic3r/SLAPrint.cpp

@@ -66,6 +66,7 @@ sla::SupportTreeConfig make_support_cfg(const SLAPrintObjectConfig& c)
             scfg.safety_distance_mm : c.support_base_safety_distance.getFloat();
     
     scfg.max_bridges_on_pillar = unsigned(c.support_max_bridges_on_pillar.getInt());
+    scfg.max_weight_on_model_support = c.support_max_weight_on_model.getFloat();
     
     return scfg;
 }
@@ -843,6 +844,7 @@ bool SLAPrintObject::invalidate_state_by_config_options(const std::vector<t_conf
             || opt_key == "support_pillar_diameter"
             || opt_key == "support_pillar_widening_factor"
             || opt_key == "support_small_pillar_diameter_percent"
+            || opt_key == "support_max_weight_on_model"
             || opt_key == "support_max_bridges_on_pillar"
             || opt_key == "support_pillar_connection_mode"
             || opt_key == "support_buildplate_only"

src/slic3r/GUI/ConfigManipulation.cpp

@@ -390,6 +390,7 @@ void ConfigManipulation::toggle_print_sla_options(DynamicPrintConfig* config)
     toggle_field("support_max_bridge_length", supports_en);
     toggle_field("support_max_pillar_link_distance", supports_en && is_default_tree);
     toggle_field("support_pillar_widening_factor", supports_en && is_branching_tree);
+    toggle_field("support_max_weight_on_model", supports_en && is_branching_tree);
     toggle_field("support_points_density_relative", supports_en);
     toggle_field("support_points_minimal_distance", supports_en);
 

src/slic3r/GUI/Tab.cpp

@@ -4850,6 +4850,7 @@ void TabSLAPrint::build()
     optgroup->append_single_option_line("support_pillar_connection_mode");
     optgroup->append_single_option_line("support_buildplate_only");
     optgroup->append_single_option_line("support_pillar_widening_factor");
+    optgroup->append_single_option_line("support_max_weight_on_model");
     optgroup->append_single_option_line("support_base_diameter");
     optgroup->append_single_option_line("support_base_height");
     optgroup->append_single_option_line("support_base_safety_distance");