hole size compensation

slic3r/Slic3r#3323
prusa3d#1065
prusa3d#794
prusa3d#515

xs/src/libslic3r/Print.hpp

@@ -194,6 +194,7 @@ class PrintObject
     SlicingParameters slicing_parameters() const;
 
     void _slice();
+    void _offsetHoles(float hole_delta, LayerRegion *layerm);
     std::string _fix_slicing_errors();
     void _simplify_slices(double distance);
     void _prepare_infill();

xs/src/libslic3r/PrintConfig.cpp

@@ -2210,11 +2210,21 @@ PrintConfigDef::PrintConfigDef()
     def->category = L("Advanced");
     def->tooltip = L("The object will be grown/shrunk in the XY plane by the configured value "
                    "(negative = inwards, positive = outwards). This might be useful "
-                   "for fine-tuning hole sizes.");
+                   "for fine-tuning sizes.");
     def->sidetext = L("mm");
     def->cli = "xy-size-compensation=f";
     def->default_value = new ConfigOptionFloat(0);
 
+    def = this->add("hole_size_compensation", coFloat);
+    def->label = L("Holes");
+    def->category = L("Advanced");
+    def->tooltip = L("The convex holes will be grown in the XY plane by the configured value"
+                   " (negative = inwards, positive = outwards, should be positive as the holes are always a bit smaller)."
+                   " This might be useful for fine-tuning hole sizes.");
+    def->sidetext = L("mm");
+    def->cli = "hole-size-compensation=f";
+    def->default_value = new ConfigOptionFloat(0);
+
     def = this->add("z_offset", coFloat);
     def->label = L("Z offset");
     def->tooltip = L("This value will be added (or subtracted) from all the Z coordinates "

xs/src/libslic3r/PrintConfig.hpp

@@ -339,6 +339,7 @@ class PrintObjectConfig : public StaticPrintConfig
     ConfigOptionBool                support_material_with_sheath;
     ConfigOptionFloatOrPercent      support_material_xy_spacing;
     ConfigOptionFloat               xy_size_compensation;
+    ConfigOptionFloat               hole_size_compensation;
     ConfigOptionBool                wipe_into_objects;
 
 protected:
@@ -376,6 +377,7 @@ class PrintObjectConfig : public StaticPrintConfig
         OPT_PTR(support_material_threshold);
         OPT_PTR(support_material_with_sheath);
         OPT_PTR(xy_size_compensation);
+        OPT_PTR(hole_size_compensation);
         OPT_PTR(wipe_into_objects);
     }
 };

xs/src/libslic3r/PrintObject.cpp

@@ -169,7 +169,8 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
                opt_key == "clip_multipart_objects"
             || opt_key == "elefant_foot_compensation"
             || opt_key == "support_material_contact_distance" 
-            || opt_key == "xy_size_compensation") {
+            || opt_key == "xy_size_compensation"
+			|| opt_key == "hole_size_compensation") {
             steps.emplace_back(posSlice);
         } else if (
                opt_key == "support_material"
@@ -1575,6 +1576,7 @@ void PrintObject::_slice()
                 Layer *layer = this->layers[layer_id];
                 // Apply size compensation and perform clipping of multi-part objects.
                 float delta = float(scale_(this->config.xy_size_compensation.value));
+                float hole_delta = float(scale_(this->config.hole_size_compensation.value));
                 if (layer_id == 0)
                     delta -= float(scale_(this->config.elefant_foot_compensation.value));
                 bool  scale = delta != 0.f;
@@ -1585,7 +1587,8 @@ void PrintObject::_slice()
                         LayerRegion *layerm = layer->regions.front();
                         layerm->slices.set(offset_ex(to_expolygons(std::move(layerm->slices.surfaces)), delta), stInternal);
                     }
-                } else if (scale || clip) {
+                    _offsetHoles(hole_delta, layer->regions.front());
+                } else if (scale || clip || hole_delta != 0.f) {
                     // Multiple regions, growing, shrinking or just clipping one region by the other.
                     // When clipping the regions, priority is given to the first regions.
                     Polygons processed;
@@ -1601,6 +1604,7 @@ void PrintObject::_slice()
                             // Collect the already processed regions to trim the to be processed regions.
                             polygons_append(processed, slices);
                         layerm->slices.set(std::move(slices), stInternal);
+                        _offsetHoles(hole_delta, layerm);
                     }
                 }
                 // Merge all regions' slices to get islands, chain them by a shortest path.
@@ -1610,6 +1614,45 @@ void PrintObject::_slice()
     BOOST_LOG_TRIVIAL(debug) << "Slicing objects - make_slices in parallel - end";
 }
 
+void PrintObject::_offsetHoles(float hole_delta, LayerRegion *layerm) {
+    if (hole_delta != 0.f) {
+        ExPolygons& polys = to_expolygons(std::move(layerm->slices.surfaces));
+        ExPolygons new_polys;
+        for (ExPolygon ex_poly : polys) {
+            ExPolygon new_ex_poly(ex_poly);
+            new_ex_poly.holes.clear();
+            for (Polygon hole : ex_poly.holes) {
+                //check if convex to reduce it
+                // check whether first point forms a convex angle
+                bool ok = true;
+                ok = (hole.points.front().ccw_angle(hole.points.back(), *(hole.points.begin() + 1)) <= PI + 0.001);
+
+
+                // check whether points 1..(n-1) form convex angles
+                if (ok)
+                    for (Points::const_iterator p = hole.points.begin() + 1; p != hole.points.end() - 1; ++p) {
+                        ok = (p->ccw_angle(*(p - 1), *(p + 1)) <= PI + 0.001);
+                        if (!ok) break;
+                    }
+
+                // check whether last point forms a convex angle
+                ok &= (hole.points.back().ccw_angle(*(hole.points.end() - 2), hole.points.front()) <= PI + 0.001);
+
+                if (ok) {
+                    for (Polygon newHole : offset(hole, hole_delta)) {
+                        //reverse because it's a hole, not an object
+                        newHole.make_clockwise();
+                        new_ex_poly.holes.push_back(newHole);
+                    }
+                } else
+                    new_ex_poly.holes.push_back(hole);
+            }
+            new_polys.push_back(new_ex_poly);
+        }
+        layerm->slices.set(std::move(new_polys), stInternal);
+    }
+}
+
 std::vector<ExPolygons> PrintObject::_slice_region(size_t region_id, const std::vector<float> &z, bool modifier)
 {
     std::vector<ExPolygons> layers;

xs/src/slic3r/GUI/Preset.cpp

@@ -298,10 +298,11 @@ const std::vector<std::string>& Preset::print_options()
         "perimeter_extrusion_width", "external_perimeter_extrusion_width", "infill_extrusion_width", "solid_infill_extrusion_width", 
         "top_infill_extrusion_width", "support_material_extrusion_width", "infill_overlap", "bridge_flow_ratio", 
         "over_bridge_flow_ratio", "clip_multipart_objects", "enforce_full_fill_volume", "external_infill_margin", "bridged_infill_margin",
-        "elefant_foot_compensation", "xy_size_compensation", "threads", "resolution", "wipe_tower", "wipe_tower_x", "wipe_tower_y",
-        "wipe_tower_width", "wipe_tower_rotation_angle", "wipe_tower_bridging", "only_one_perimeter_top", "compatible_printers",
-        "compatible_printers_condition", "inherits", "infill_dense_layers", "infill_dense_density", "infill_dense_pattern",
-		"infill_dense_angle", "no_perimeter_unsupported", "min_perimeter_unsupported", "noperi_bridge_only"
+        "elefant_foot_compensation", "xy_size_compensation", "hole_size_compensation", "threads", "resolution",
+		"wipe_tower", "wipe_tower_x", "wipe_tower_y", "wipe_tower_width", "wipe_tower_rotation_angle", "wipe_tower_bridging",
+		"only_one_perimeter_top", "compatible_printers", "compatible_printers_condition", "inherits", 
+		"infill_dense_layers", "infill_dense_density", "infill_dense_pattern", "infill_dense_angle", 
+		"no_perimeter_unsupported", "min_perimeter_unsupported", "noperi_bridge_only"
     };
     return s_opts;
 }

xs/src/slic3r/GUI/Tab.cpp

@@ -963,6 +963,7 @@ void TabPrint::build()
 		optgroup->append_single_option_line("clip_multipart_objects");
 		optgroup->append_single_option_line("elefant_foot_compensation");
 		optgroup->append_single_option_line("xy_size_compensation");
+		optgroup->append_single_option_line("hole_size_compensation");
 //		#            optgroup->append_single_option_line("threads");
 		optgroup->append_single_option_line("resolution");