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Improvement of automatic SLA supports: Don't put support points

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on vertical walls.
This commit is contained in:
bubnikv 2019-02-27 08:49:09 +01:00
parent 93eac724c9
commit 878ef5eee0
2 changed files with 9 additions and 2 deletions
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7
src/libslic3r/SLA/SLAAutoSupports.cpp
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@ -144,6 +144,8 @@ static std::vector<SLAAutoSupports::MyLayer> make_layers(
const float layer_height = (layer_id!=0 ? heights[layer_id]-heights[layer_id-1] : heights[0]);
const float safe_angle = 5.f * (float(M_PI)/180.f); // smaller number - less supports
const float between_layers_offset = float(scale_(layer_height / std::tan(safe_angle)));
const float slope_angle = 75.f * (float(M_PI)/180.f); // smaller number - less supports
const float slope_offset = float(scale_(layer_height / std::tan(slope_angle)));
//FIXME This has a quadratic time complexity, it will be excessively slow for many tiny islands.
for (SLAAutoSupports::Structure &top : layer_above.islands) {
for (SLAAutoSupports::Structure &bottom : layer_below.islands) {
@ -173,6 +175,7 @@ static std::vector<SLAAutoSupports::MyLayer> make_layers(
overhangs_sorted.emplace_back(std::move(*p.first));
top.overhangs = std::move(overhangs_sorted);
top.overhangs_area *= float(SCALING_FACTOR * SCALING_FACTOR);
top.overhangs_slopes = diff_ex(top_polygons, offset(bottom_polygons, slope_offset));
top.dangling_areas = diff_ex(top_polygons, offset(bottom_polygons, between_layers_offset));
}
}
@ -241,9 +244,9 @@ void SLAAutoSupports::process(const std::vector<ExPolygons>& slices, const std::
// What we now have in polygons needs support, regardless of what the forces are, so we can add them.
//FIXME is it an island point or not? Vojtech thinks it is.
uniformly_cover(s.dangling_areas, s, point_grid);
} else if (! s.overhangs.empty()) {
} else if (! s.overhangs_slopes.empty()) {
//FIXME add the support force deficit as a parameter, only cover until the defficiency is covered.
uniformly_cover(s.overhangs, s, point_grid);
uniformly_cover(s.overhangs_slopes, s, point_grid);
}
}

4
src/libslic3r/SLA/SLAAutoSupports.hpp
View file

@ -65,8 +65,12 @@ public:
std::vector<Link> islands_above;
std::vector<Link> islands_below;
#endif
// Overhangs, that are dangling considerably.
ExPolygons dangling_areas;
// Complete overhands.
ExPolygons overhangs;
// Overhangs, where the surface must slope.
ExPolygons overhangs_slopes;
float overhangs_area;
bool overlaps(const Structure &rhs) const {