Fixed an unintentional transformation of ExPolygon to a single vector containing all points from contour and all holes in the Lightning infill.

This was causing most of the issues with randomly generated infill hanging in the air without any support.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libslic3r/Fill/Lightning/Generator.cpp b/src/libslic3r/Fill/Lightning/Generator.cpp
index 4aba7202d..75ca5583e 100644
--- a/src/libslic3r/Fill/Lightning/Generator.cpp
+++ b/src/libslic3r/Fill/Lightning/Generator.cpp
@@ -62,7 +62,7 @@ void Generator::generateInitialInternalOverhangs(const PrintObject &print_object
         for (const LayerRegion* layerm : print_object.get_layer(layer_nr)->regions())
             for (const Surface& surface : layerm->fill_surfaces.surfaces)
                 if (surface.surface_type == stInternal || surface.surface_type == stInternalVoid)
-                    infill_area_here.emplace_back(surface.expolygon);
+                    append(infill_area_here, to_polygons(surface.expolygon));
 
         //Remove the part of the infill area that is already supported by the walls.
         Polygons overhang = diff(offset(infill_area_here, -float(m_wall_supporting_radius)), infill_area_above);
@@ -90,7 +90,7 @@ void Generator::generateTrees(const PrintObject &print_object, const std::functi
         for (const LayerRegion *layerm : print_object.get_layer(layer_id)->regions())
             for (const Surface &surface : layerm->fill_surfaces.surfaces)
                 if (surface.surface_type == stInternal || surface.surface_type == stInternalVoid)
-                    infill_outlines[layer_id].emplace_back(surface.expolygon);
+                    append(infill_outlines[layer_id], to_polygons(surface.expolygon));
     }
 
     // For various operations its beneficial to quickly locate nearby features on the polygon: