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Improvements to support point generator

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- Separate the 3 bands -- dangling, sloping and full overhanging -- regions and handle them with different support force deficits.

- Use a heuristic for overhanging edges to increase the number of support points generated for them


- Try to make overhangs and slopes deficit depend on stable area.
This commit is contained in:
tamasmeszaros 2020-08-31 10:38:24 +02:00
parent a9a99de939
commit 26d5c30366
2 changed files with 143 additions and 52 deletions
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24
src/libslic3r/SLA/SupportPointGenerator.hpp
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@ -38,8 +38,8 @@ public:
struct MyLayer;
struct Structure {
Structure(MyLayer &layer, const ExPolygon& poly, const BoundingBox &bbox, const Vec2f &centroid, float area, float h) :
layer(&layer), polygon(&poly), bbox(bbox), centroid(centroid), area(area), height(h)
Structure(MyLayer &layer, const ExPolygon& poly, const BoundingBox &bbox, const Vec2f &centroid, float area, float h) :
layer(&layer), polygon(&poly), bbox(bbox), centroid(centroid), area(area), zlevel(h)
#ifdef SLA_SUPPORTPOINTGEN_DEBUG
, unique_id(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()))
#endif /* SLA_SUPPORTPOINTGEN_DEBUG */
@ -49,7 +49,7 @@ public:
const BoundingBox bbox;
const Vec2f centroid = Vec2f::Zero();
const float area = 0.f;
float height = 0;
float zlevel = 0;
// How well is this ExPolygon held to the print base?
// Positive number, the higher the better.
float supports_force_this_layer = 0.f;
@ -159,8 +159,8 @@ public:
grid.emplace(cell_id(pt.position), pt);
}
bool collides_with(const Vec2f &pos, Structure *island, float radius) {
Vec3f pos3d(pos.x(), pos.y(), float(island->layer->print_z));
bool collides_with(const Vec2f &pos, float print_z, float radius) {
Vec3f pos3d(pos.x(), pos.y(), print_z);
Vec3i cell = cell_id(pos3d);
std::pair<Grid::const_iterator, Grid::const_iterator> it_pair = grid.equal_range(cell);
if (collides_with(pos3d, radius, it_pair.first, it_pair.second))
@ -198,7 +198,16 @@ private:
SupportPointGenerator::Config m_config;
void process(const std::vector<ExPolygons>& slices, const std::vector<float>& heights);
void uniformly_cover(const ExPolygons& islands, Structure& structure, PointGrid3D &grid3d, bool is_new_island = false, bool just_one = false);
public:
enum IslandCoverageFlags : uint8_t { icfNone = 0x0, icfIsNew = 0x1, icfBoundaryOnly = 0x2 };
private:
void uniformly_cover(const ExPolygons& islands, Structure& structure, float deficit, PointGrid3D &grid3d, IslandCoverageFlags flags = icfNone);
void add_support_points(Structure& structure, PointGrid3D &grid3d);
void project_onto_mesh(std::vector<SupportPoint>& points) const;
#ifdef SLA_SUPPORTPOINTGEN_DEBUG
@ -215,6 +224,9 @@ private:
void remove_bottom_points(std::vector<SupportPoint> &pts, float lvl);
std::vector<Vec2f> sample_expolygon(const ExPolygon &expoly, float samples_per_mm2, std::mt19937 &rng);
void sample_expolygon_boundary(const ExPolygon &expoly, float samples_per_mm, std::vector<Vec2f> &out, std::mt19937 &rng);
}} // namespace Slic3r::sla
#endif // SUPPORTPOINTGENERATOR_HPP