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Parallelization of regions merging for MMU segmentation.

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Lukáš Hejl 2021-05-03 21:01:52 +02:00
parent 2e9f0d6eaf
commit 5bfdaa7ac8
1 changed files with 21 additions and 19 deletions
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40
src/libslic3r/MultiMaterialSegmentation.cpp
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@ -1360,25 +1360,27 @@ std::vector<std::vector<std::pair<ExPolygon, size_t>>> multi_material_segmentati
std::vector<Polygons> input_polygons(layers.size());
// Merge all regions and remove small holes
for(size_t layer_idx = 0; layer_idx < layers.size(); layer_idx += 1) {
ExPolygons ex_polygons;
for (LayerRegion *region : layers[layer_idx]->regions())
for (const Surface &surface : region->slices.surfaces)
Slic3r::append(ex_polygons, offset_ex(surface.expolygon, SCALED_EPSILON));
// All expolygons are expanded by SCALED_EPSILON, merged, and then shrunk again by SCALED_EPSILON
// to ensure that very close polygons will be merged.
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)));
// 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)));
}
tbb::parallel_for(tbb::blocked_range<size_t>(0, layers.size()), [&](const tbb::blocked_range<size_t> &range) {
for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++layer_idx) {
ExPolygons ex_polygons;
for (LayerRegion *region : layers[layer_idx]->regions())
for (const Surface &surface : region->slices.surfaces)
Slic3r::append(ex_polygons, offset_ex(surface.expolygon, SCALED_EPSILON));
// All expolygons are expanded by SCALED_EPSILON, merged, and then shrunk again by SCALED_EPSILON
// to ensure that very close polygons will be merged.
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)));
// 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)));
}
}); // end of parallel_for
for (size_t layer_idx = 0; layer_idx < layers.size(); ++layer_idx) {
BoundingBox bbox(get_extents(input_polygons[layer_idx]));