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Used function smooth_outward in multi-material segmentation to get rid of artifacts arisen after merging multi-volume objects.

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This commit is contained in:
Lukáš Hejl 2021-06-25 18:33:57 +02:00
parent a426093f12
commit cb93c8ce99
2 changed files with 25 additions and 5 deletions
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11
src/libslic3r/MultiMaterialSegmentation.cpp
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@ -4,6 +4,7 @@
#include "Layer.hpp"
#include "Print.hpp"
#include "VoronoiVisualUtils.hpp"
#include "MutablePolygon.hpp"
#include <utility>
#include <cfloat>
@ -1421,7 +1422,7 @@ std::vector<std::vector<std::pair<ExPolygon, size_t>>> multi_material_segmentati
// 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 all expolygons and holes with an area less than 0.1mm^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.
@ -1430,19 +1431,19 @@ std::vector<std::vector<std::pair<ExPolygon, size_t>>> multi_material_segmentati
// 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_expolygons[layer_idx] = simplify_polygons_ex(to_polygons(expolygons_simplify(offset_ex(ex_polygons, float(-10 * SCALED_EPSILON)), 5 * SCALED_EPSILON)));
input_polygons[layer_idx] = to_polygons(input_expolygons[layer_idx]);
input_expolygons[layer_idx] = smooth_outward(expolygons_simplify(offset_ex(ex_polygons, -10.f * float(SCALED_EPSILON)), 5 * SCALED_EPSILON), 10 * coord_t(SCALED_EPSILON));
input_polygons[layer_idx] = to_polygons(input_expolygons[layer_idx]);
}
}); // end of parallel_for
BOOST_LOG_TRIVIAL(debug) << "MMU segmentation - slices preparation in parallel - end";
for (size_t layer_idx = 0; layer_idx < layers.size(); ++layer_idx) {
throw_on_cancel_callback();
BoundingBox bbox(get_extents(input_expolygons[layer_idx]));
BoundingBox bbox(get_extents(input_polygons[layer_idx]));
// Projected triangles may slightly exceed the input polygons.
bbox.offset(20 * SCALED_EPSILON);
edge_grids[layer_idx].set_bbox(bbox);
edge_grids[layer_idx].create(input_expolygons[layer_idx], coord_t(scale_(10.)));
edge_grids[layer_idx].create(input_polygons[layer_idx], coord_t(scale_(10.)));
}
BOOST_LOG_TRIVIAL(debug) << "MMU segmentation - projection of painted triangles - begin";

19
src/libslic3r/MutablePolygon.hpp
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@ -3,6 +3,7 @@
#include "Point.hpp"
#include "Polygon.hpp"
#include "ExPolygon.hpp"
namespace Slic3r {
@ -330,6 +331,24 @@ inline Polygons smooth_outward(Polygons polygons, coord_t clip_dist_scaled)
return polygons;
}
inline ExPolygons smooth_outward(ExPolygons expolygons, coord_t clip_dist_scaled)
{
MutablePolygon mp;
for (ExPolygon &expolygon : expolygons) {
mp.assign(expolygon.contour, expolygon.contour.size() * 2);
smooth_outward(mp, clip_dist_scaled);
mp.polygon(expolygon.contour);
for (Polygon &hole : expolygon.holes) {
mp.assign(hole, hole.size() * 2);
smooth_outward(mp, clip_dist_scaled);
mp.polygon(hole);
}
expolygon.holes.erase(std::remove_if(expolygon.holes.begin(), expolygon.holes.end(), [](const auto &p) { return p.empty(); }), expolygon.holes.end());
}
expolygons.erase(std::remove_if(expolygons.begin(), expolygons.end(), [](const auto &p) { return p.empty(); }), expolygons.end());
return expolygons;
}
}
#endif // slic3r_MutablePolygon_hpp_