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Fixed a few cases of missing colored segments in MMU segmentation.

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Occasionally, some input polygons contained self-intersections that caused problems with Voronoi diagrams and consequently with the extraction of colored segments by function extract_colored_segments.
Also, occasionally input polygons contained several points very close together (distance between points is 1 or so). Such close points sometimes caused that the Voronoi diagram has self-intersecting edges around these vertices. This consequently leads to issues with the extraction of colored segments by function extract_colored_segments.
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Lukáš Hejl 2021-05-03 20:56:39 +02:00
parent 168b4afbc2
commit 2e9f0d6eaf
1 changed files with 8 additions and 1 deletions
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9
src/libslic3r/MultiMaterialSegmentation.cpp
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@ -1370,7 +1370,14 @@ std::vector<std::vector<std::pair<ExPolygon, size_t>>> multi_material_segmentati
ex_polygons = union_ex(ex_polygons);
// Remove all expolygons and holes with an area less than 0.01mm^2
remove_small_and_small_holes(ex_polygons, Slic3r::sqr(scale_(0.1f)));
input_polygons[layer_idx] = to_polygons(union_ex(offset_ex(ex_polygons, -SCALED_EPSILON)));
// Occasionally, some input polygons contained self-intersections that caused problems with Voronoi diagrams
// and consequently with the extraction of colored segments by function extract_colored_segments.
// Calling simplify_polygons removes these self-intersections.
// Also, occasionally input polygons contained several points very close together (distance between points is 1 or so).
// Such close points sometimes caused that the Voronoi diagram has self-intersecting edges around these vertices.
// This consequently leads to issues with the extraction of colored segments by function extract_colored_segments.
// Calling expolygons_simplify fixed these issues.
input_polygons[layer_idx] = simplify_polygons(to_polygons(expolygons_simplify(offset_ex(ex_polygons, -SCALED_EPSILON), SCALED_EPSILON)));
}
for (size_t layer_idx = 0; layer_idx < layers.size(); ++layer_idx) {