186 lines
7.4 KiB
C++
186 lines
7.4 KiB
C++
#ifndef SLAAUTOSUPPORTS_HPP_
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#define SLAAUTOSUPPORTS_HPP_
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#include <libslic3r/Point.hpp>
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#include <libslic3r/TriangleMesh.hpp>
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#include <libslic3r/SLA/SLACommon.hpp>
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#include <boost/container/small_vector.hpp>
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// #define SLA_AUTOSUPPORTS_DEBUG
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namespace Slic3r {
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class SLAAutoSupports {
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public:
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struct Config {
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float density_at_horizontal;
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float density_at_45;
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float minimal_z;
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///////////////
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// float support_force = 30.f; // a force one point can support (arbitrary force unit)
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float support_force = 10.f; // a force one point can support (arbitrary force unit)
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float tear_pressure = 1.f; // pressure that the display exerts (the force unit per mm2)
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};
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SLAAutoSupports(const TriangleMesh& mesh, const sla::EigenMesh3D& emesh, const std::vector<ExPolygons>& slices,
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const std::vector<float>& heights, const Config& config, std::function<void(void)> throw_on_cancel);
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const std::vector<sla::SupportPoint>& output() { return m_output; }
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struct MyLayer;
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struct Structure {
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Structure(MyLayer &layer, const ExPolygon& poly, const BoundingBox &bbox, const Vec2f ¢roid, float area, float h) :
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layer(&layer), polygon(&poly), bbox(bbox), centroid(centroid), area(area), height(h)
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#ifdef SLA_AUTOSUPPORTS_DEBUG
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, unique_id(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()))
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#endif /* SLA_AUTOSUPPORTS_DEBUG */
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{}
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MyLayer *layer;
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const ExPolygon* polygon = nullptr;
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const BoundingBox bbox;
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const Vec2f centroid = Vec2f::Zero();
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const float area = 0.f;
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float height = 0;
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// How well is this ExPolygon held to the print base?
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// Positive number, the higher the better.
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float supports_force_this_layer = 0.f;
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float supports_force_inherited = 0.f;
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float supports_force_total() const { return this->supports_force_this_layer + this->supports_force_inherited; }
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#ifdef SLA_AUTOSUPPORTS_DEBUG
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std::chrono::milliseconds unique_id;
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#endif /* SLA_AUTOSUPPORTS_DEBUG */
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#ifdef NDEBUG
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// In release mode, use the optimized container.
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boost::container::small_vector<Structure*, 4> islands_above;
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boost::container::small_vector<Structure*, 4> islands_below;
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#else
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// In debug mode, use the standard vector, which is well handled by debugger visualizer.
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std::vector<Structure*> islands_above;
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std::vector<Structure*> islands_below;
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#endif
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ExPolygons dangling_areas;
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ExPolygons overhangs;
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float overhangs_area;
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bool overlaps(const Structure &rhs) const { return this->bbox.overlap(rhs.bbox) && (this->polygon->overlaps(*rhs.polygon) || rhs.polygon->overlaps(*this->polygon)); }
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float area_below() const {
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float area = 0.f;
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for (const Structure *below : this->islands_below)
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area += below->area;
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return area;
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}
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Polygons polygons_below() const {
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size_t cnt = 0;
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for (const Structure *below : this->islands_below)
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cnt += 1 + below->polygon->holes.size();
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Polygons out;
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out.reserve(cnt);
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for (const Structure *below : this->islands_below) {
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out.emplace_back(below->polygon->contour);
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append(out, below->polygon->holes);
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}
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return out;
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}
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ExPolygons expolygons_below() const {
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ExPolygons out;
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out.reserve(this->islands_below.size());
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for (const Structure *below : this->islands_below)
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out.emplace_back(*below->polygon);
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return out;
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}
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// Positive deficit of the supports. If negative, this area is well supported. If positive, more supports need to be added.
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float support_force_deficit(const float tear_pressure) const { return this->area * tear_pressure - this->supports_force_total(); }
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};
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struct MyLayer {
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MyLayer(const size_t layer_id, coordf_t print_z) : layer_id(layer_id), print_z(print_z) {}
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size_t layer_id;
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coordf_t print_z;
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std::vector<Structure> islands;
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};
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struct RichSupportPoint {
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Vec3f position;
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Structure *island;
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};
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struct PointGrid3D {
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struct GridHash {
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std::size_t operator()(const Vec3i &cell_id) const {
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return std::hash<int>()(cell_id.x()) ^ std::hash<int>()(cell_id.y() * 593) ^ std::hash<int>()(cell_id.z() * 7919);
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}
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};
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typedef std::unordered_multimap<Vec3i, RichSupportPoint, GridHash> Grid;
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Vec3f cell_size;
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Grid grid;
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Vec3i cell_id(const Vec3f &pos) {
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return Vec3i(int(floor(pos.x() / cell_size.x())),
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int(floor(pos.y() / cell_size.y())),
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int(floor(pos.z() / cell_size.z())));
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}
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void insert(const Vec2f &pos, Structure *island) {
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RichSupportPoint pt;
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pt.position = Vec3f(pos.x(), pos.y(), float(island->layer->print_z));
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pt.island = island;
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grid.emplace(cell_id(pt.position), pt);
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}
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bool collides_with(const Vec2f &pos, Structure *island, float radius) {
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Vec3f pos3d(pos.x(), pos.y(), float(island->layer->print_z));
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Vec3i cell = cell_id(pos3d);
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std::pair<Grid::const_iterator, Grid::const_iterator> it_pair = grid.equal_range(cell);
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if (collides_with(pos3d, radius, it_pair.first, it_pair.second))
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return true;
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for (int i = -1; i < 2; ++ i)
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for (int j = -1; j < 2; ++ j)
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for (int k = -1; k < 1; ++ k) {
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if (i == 0 && j == 0 && k == 0)
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continue;
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it_pair = grid.equal_range(cell + Vec3i(i, j, k));
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if (collides_with(pos3d, radius, it_pair.first, it_pair.second))
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return true;
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}
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return false;
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}
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private:
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bool collides_with(const Vec3f &pos, float radius, Grid::const_iterator it_begin, Grid::const_iterator it_end) {
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for (Grid::const_iterator it = it_begin; it != it_end; ++ it) {
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float dist2 = (it->second.position - pos).squaredNorm();
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if (dist2 < radius * radius)
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return true;
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}
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return false;
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}
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};
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private:
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std::vector<sla::SupportPoint> m_output;
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SLAAutoSupports::Config m_config;
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float m_supports_force_total = 0.f;
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void process(const std::vector<ExPolygons>& slices, const std::vector<float>& heights);
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void uniformly_cover(const ExPolygons& islands, Structure& structure, PointGrid3D &grid3d, bool is_new_island = false, bool just_one = false);
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void project_onto_mesh(std::vector<sla::SupportPoint>& points) const;
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#ifdef SLA_AUTOSUPPORTS_DEBUG
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static void output_expolygons(const ExPolygons& expolys, const std::string &filename);
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static void output_structures(const std::vector<Structure> &structures);
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#endif // SLA_AUTOSUPPORTS_DEBUG
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std::function<void(void)> m_throw_on_cancel;
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const sla::EigenMesh3D& m_emesh;
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};
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} // namespace Slic3r
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#endif // SLAAUTOSUPPORTS_HPP_
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