ee626eb65a
into a graph with links to the layer above / below. In addition: Members of LayerRegion were made private, public interface const only. this->m_xxx replaced with just m_xxx SurfacesPtr was made a vector of const pointers.
355 lines
18 KiB
C++
355 lines
18 KiB
C++
#ifndef slic3r_TriangleMesh_hpp_
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#define slic3r_TriangleMesh_hpp_
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#include "libslic3r.h"
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#include <admesh/stl.h>
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#include <functional>
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#include <vector>
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#include "BoundingBox.hpp"
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#include "Line.hpp"
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#include "Point.hpp"
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#include "Polygon.hpp"
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#include "ExPolygon.hpp"
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namespace Slic3r {
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class TriangleMesh;
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class TriangleMeshSlicer;
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struct RepairedMeshErrors {
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// How many edges were united by merging their end points with some other end points in epsilon neighborhood?
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int edges_fixed = 0;
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// How many degenerate faces were removed?
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int degenerate_facets = 0;
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// How many faces were removed during fixing? Includes degenerate_faces and disconnected faces.
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int facets_removed = 0;
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// New faces could only be created with stl_fill_holes() and we ditched stl_fill_holes(), because mostly it does more harm than good.
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//int facets_added = 0;
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// How many facets were revesed? Faces are reversed by admesh while it connects patches of triangles togeter and a flipped triangle is encountered.
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// Also the facets are reversed when a negative volume is corrected by flipping all facets.
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int facets_reversed = 0;
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// Edges shared by two triangles, oriented incorrectly.
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int backwards_edges = 0;
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void clear() { *this = RepairedMeshErrors(); }
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void merge(const RepairedMeshErrors& rhs) {
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this->edges_fixed += rhs.edges_fixed;
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this->degenerate_facets += rhs.degenerate_facets;
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this->facets_removed += rhs.facets_removed;
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this->facets_reversed += rhs.facets_reversed;
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this->backwards_edges += rhs.backwards_edges;
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}
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bool repaired() const { return degenerate_facets > 0 || edges_fixed > 0 || facets_removed > 0 || facets_reversed > 0 || backwards_edges > 0; }
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};
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struct TriangleMeshStats {
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// Mesh metrics.
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uint32_t number_of_facets = 0;
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stl_vertex max = stl_vertex::Zero();
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stl_vertex min = stl_vertex::Zero();
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stl_vertex size = stl_vertex::Zero();
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float volume = -1.f;
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int number_of_parts = 0;
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// Mesh errors, remaining.
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int open_edges = 0;
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// Mesh errors, fixed.
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RepairedMeshErrors repaired_errors;
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void clear() { *this = TriangleMeshStats(); }
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TriangleMeshStats merge(const TriangleMeshStats &rhs) const {
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if (this->number_of_facets == 0)
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return rhs;
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else if (rhs.number_of_facets == 0)
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return *this;
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else {
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TriangleMeshStats out;
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out.number_of_facets = this->number_of_facets + rhs.number_of_facets;
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out.min = this->min.cwiseMin(rhs.min);
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out.max = this->max.cwiseMax(rhs.max);
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out.size = out.max - out.min;
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out.number_of_parts = this->number_of_parts + rhs.number_of_parts;
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out.open_edges = this->open_edges + rhs.open_edges;
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out.volume = this->volume + rhs.volume;
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out.repaired_errors.merge(rhs.repaired_errors);
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return out;
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}
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}
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bool manifold() const { return open_edges == 0; }
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bool repaired() const { return repaired_errors.repaired(); }
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};
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class TriangleMesh
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{
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public:
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TriangleMesh() = default;
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TriangleMesh(const std::vector<Vec3f> &vertices, const std::vector<Vec3i> &faces);
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TriangleMesh(std::vector<Vec3f> &&vertices, const std::vector<Vec3i> &&faces);
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explicit TriangleMesh(const indexed_triangle_set &M);
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explicit TriangleMesh(indexed_triangle_set &&M, const RepairedMeshErrors& repaired_errors = RepairedMeshErrors());
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void clear() { this->its.clear(); m_stats.clear(); }
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bool ReadSTLFile(const char* input_file, bool repair = true);
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bool write_ascii(const char* output_file);
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bool write_binary(const char* output_file);
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float volume();
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void WriteOBJFile(const char* output_file) const;
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void scale(float factor);
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void scale(const Vec3f &versor);
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void translate(float x, float y, float z);
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void translate(const Vec3f &displacement);
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void rotate(float angle, const Axis &axis);
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void rotate(float angle, const Vec3d& axis);
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void rotate_x(float angle) { this->rotate(angle, X); }
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void rotate_y(float angle) { this->rotate(angle, Y); }
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void rotate_z(float angle) { this->rotate(angle, Z); }
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void mirror(const Axis axis);
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void mirror_x() { this->mirror(X); }
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void mirror_y() { this->mirror(Y); }
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void mirror_z() { this->mirror(Z); }
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void transform(const Transform3d& t, bool fix_left_handed = false);
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void transform(const Matrix3d& t, bool fix_left_handed = false);
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// Flip triangles, negate volume.
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void flip_triangles();
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void align_to_origin();
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void rotate(double angle, Point* center);
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std::vector<TriangleMesh> split() const;
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void merge(const TriangleMesh &mesh);
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ExPolygons horizontal_projection() const;
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// 2D convex hull of a 3D mesh projected into the Z=0 plane.
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Polygon convex_hull();
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BoundingBoxf3 bounding_box() const;
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// Returns the bbox of this TriangleMesh transformed by the given transformation
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BoundingBoxf3 transformed_bounding_box(const Transform3d &trafo) const;
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// Variant returning the bbox of the part of this TriangleMesh above the given world_min_z
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BoundingBoxf3 transformed_bounding_box(const Transform3d& trafo, double world_min_z) const;
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// Return the size of the mesh in coordinates.
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Vec3d size() const { return m_stats.size.cast<double>(); }
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/// Return the center of the related bounding box.
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Vec3d center() const { return this->bounding_box().center(); }
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// Returns the convex hull of this TriangleMesh
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TriangleMesh convex_hull_3d() const;
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// Slice this mesh at the provided Z levels and return the vector
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std::vector<ExPolygons> slice(const std::vector<double>& z) const;
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size_t facets_count() const { assert(m_stats.number_of_facets == this->its.indices.size()); return m_stats.number_of_facets; }
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bool empty() const { return this->facets_count() == 0; }
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bool repaired() const;
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bool is_splittable() const;
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bool has_zero_volume() const;
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// Estimate of the memory occupied by this structure, important for keeping an eye on the Undo / Redo stack allocation.
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size_t memsize() const;
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// Used by the Undo / Redo stack, legacy interface. As of now there is nothing cached at TriangleMesh,
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// but we may decide to cache some data in the future (for example normals), thus we keep the interface in place.
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// Release optional data from the mesh if the object is on the Undo / Redo stack only. Returns the amount of memory released.
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size_t release_optional() { return 0; }
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// Restore optional data possibly released by release_optional().
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void restore_optional() {}
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const TriangleMeshStats& stats() const { return m_stats; }
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indexed_triangle_set its;
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private:
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TriangleMeshStats m_stats;
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};
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// Index of face indices incident with a vertex index.
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struct VertexFaceIndex
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{
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public:
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using iterator = std::vector<size_t>::const_iterator;
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VertexFaceIndex(const indexed_triangle_set &its) { this->create(its); }
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VertexFaceIndex() {}
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void create(const indexed_triangle_set &its);
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void clear() { m_vertex_to_face_start.clear(); m_vertex_faces_all.clear(); }
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// Iterators of face indices incident with the input vertex_id.
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iterator begin(size_t vertex_id) const throw() { return m_vertex_faces_all.begin() + m_vertex_to_face_start[vertex_id]; }
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iterator end (size_t vertex_id) const throw() { return m_vertex_faces_all.begin() + m_vertex_to_face_start[vertex_id + 1]; }
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// Vertex incidence.
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size_t count(size_t vertex_id) const throw() { return m_vertex_to_face_start[vertex_id + 1] - m_vertex_to_face_start[vertex_id]; }
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const Range<iterator> operator[](size_t vertex_id) const { return {begin(vertex_id), end(vertex_id)}; }
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private:
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std::vector<size_t> m_vertex_to_face_start;
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std::vector<size_t> m_vertex_faces_all;
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};
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// Map from a face edge to a unique edge identifier or -1 if no neighbor exists.
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// Two neighbor faces share a unique edge identifier even if they are flipped.
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// Used for chaining slice lines into polygons.
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std::vector<Vec3i> its_face_edge_ids(const indexed_triangle_set &its);
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std::vector<Vec3i> its_face_edge_ids(const indexed_triangle_set &its, std::function<void()> throw_on_cancel_callback);
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std::vector<Vec3i> its_face_edge_ids(const indexed_triangle_set &its, const std::vector<bool> &face_mask);
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// Having the face neighbors available, assign unique edge IDs to face edges for chaining of polygons over slices.
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std::vector<Vec3i> its_face_edge_ids(const indexed_triangle_set &its, std::vector<Vec3i> &face_neighbors, bool assign_unbound_edges = false, int *num_edges = nullptr);
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// Create index that gives neighbor faces for each face. Ignores face orientations.
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std::vector<Vec3i> its_face_neighbors(const indexed_triangle_set &its);
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std::vector<Vec3i> its_face_neighbors_par(const indexed_triangle_set &its);
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// After applying a transformation with negative determinant, flip the faces to keep the transformed mesh volume positive.
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void its_flip_triangles(indexed_triangle_set &its);
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// Merge duplicate vertices, return number of vertices removed.
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// This function will happily create non-manifolds if more than two faces share the same vertex position
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// or more than two faces share the same edge position!
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int its_merge_vertices(indexed_triangle_set &its, bool shrink_to_fit = true);
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// Remove degenerate faces, return number of faces removed.
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int its_remove_degenerate_faces(indexed_triangle_set &its, bool shrink_to_fit = true);
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// Remove vertices, which none of the faces references. Return number of freed vertices.
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int its_compactify_vertices(indexed_triangle_set &its, bool shrink_to_fit = true);
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// store part of index triangle set
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bool its_store_triangle(const indexed_triangle_set &its, const char *obj_filename, size_t triangle_index);
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bool its_store_triangles(const indexed_triangle_set &its, const char *obj_filename, const std::vector<size_t>& triangles);
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std::vector<indexed_triangle_set> its_split(const indexed_triangle_set &its);
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std::vector<indexed_triangle_set> its_split(const indexed_triangle_set &its, std::vector<Vec3i> &face_neighbors);
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// Number of disconnected patches (faces are connected if they share an edge, shared edge defined with 2 shared vertex indices).
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size_t its_number_of_patches(const indexed_triangle_set &its);
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size_t its_number_of_patches(const indexed_triangle_set &its, const std::vector<Vec3i> &face_neighbors);
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// Same as its_number_of_patches(its) > 1, but faster.
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bool its_is_splittable(const indexed_triangle_set &its);
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bool its_is_splittable(const indexed_triangle_set &its, const std::vector<Vec3i> &face_neighbors);
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// Calculate number of unconnected face edges. There should be no unconnected edge in a manifold mesh.
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size_t its_num_open_edges(const indexed_triangle_set &its);
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size_t its_num_open_edges(const std::vector<Vec3i> &face_neighbors);
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// Calculate and returns the list of unconnected face edges.
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// Each edge is represented by the indices of the two endpoint vertices
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std::vector<std::pair<int, int>> its_get_open_edges(const indexed_triangle_set& its);
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// Shrink the vectors of its.vertices and its.faces to a minimum size by reallocating the two vectors.
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void its_shrink_to_fit(indexed_triangle_set &its);
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// For convex hull calculation: Transform mesh, trim it by the Z plane and collect all vertices. Duplicate vertices will be produced.
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void its_collect_mesh_projection_points_above(const indexed_triangle_set &its, const Matrix3f &m, const float z, Points &all_pts);
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void its_collect_mesh_projection_points_above(const indexed_triangle_set &its, const Transform3f &t, const float z, Points &all_pts);
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// Calculate 2D convex hull of a transformed and clipped mesh. Uses the function above.
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Polygon its_convex_hull_2d_above(const indexed_triangle_set &its, const Matrix3f &m, const float z);
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Polygon its_convex_hull_2d_above(const indexed_triangle_set &its, const Transform3f &t, const float z);
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// Index of a vertex inside triangle_indices.
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inline int its_triangle_vertex_index(const stl_triangle_vertex_indices &triangle_indices, int vertex_idx)
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{
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return vertex_idx == triangle_indices[0] ? 0 :
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vertex_idx == triangle_indices[1] ? 1 :
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vertex_idx == triangle_indices[2] ? 2 : -1;
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}
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inline Vec2i its_triangle_edge(const stl_triangle_vertex_indices &triangle_indices, int edge_idx)
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{
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int next_edge_idx = (edge_idx == 2) ? 0 : edge_idx + 1;
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return { triangle_indices[edge_idx], triangle_indices[next_edge_idx] };
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}
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// Index of an edge inside triangle.
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inline int its_triangle_edge_index(const stl_triangle_vertex_indices &triangle_indices, const Vec2i &triangle_edge)
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{
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return triangle_edge(0) == triangle_indices[0] && triangle_edge(1) == triangle_indices[1] ? 0 :
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triangle_edge(0) == triangle_indices[1] && triangle_edge(1) == triangle_indices[2] ? 1 :
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triangle_edge(0) == triangle_indices[2] && triangle_edge(1) == triangle_indices[0] ? 2 : -1;
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}
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using its_triangle = std::array<stl_vertex, 3>;
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inline its_triangle its_triangle_vertices(const indexed_triangle_set &its,
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size_t face_id)
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{
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return {its.vertices[its.indices[face_id](0)],
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its.vertices[its.indices[face_id](1)],
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its.vertices[its.indices[face_id](2)]};
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}
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inline stl_normal its_unnormalized_normal(const indexed_triangle_set &its,
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size_t face_id)
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{
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its_triangle tri = its_triangle_vertices(its, face_id);
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return (tri[1] - tri[0]).cross(tri[2] - tri[0]);
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}
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float its_volume(const indexed_triangle_set &its);
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float its_average_edge_length(const indexed_triangle_set &its);
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void its_merge(indexed_triangle_set &A, const indexed_triangle_set &B);
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void its_merge(indexed_triangle_set &A, const std::vector<Vec3f> &triangles);
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void its_merge(indexed_triangle_set &A, const Pointf3s &triangles);
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std::vector<Vec3f> its_face_normals(const indexed_triangle_set &its);
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inline Vec3f face_normal(const stl_vertex vertex[3]) { return (vertex[1] - vertex[0]).cross(vertex[2] - vertex[1]).normalized(); }
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inline Vec3f face_normal_normalized(const stl_vertex vertex[3]) { return face_normal(vertex).normalized(); }
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inline Vec3f its_face_normal(const indexed_triangle_set &its, const stl_triangle_vertex_indices face)
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{ const stl_vertex vertices[3] { its.vertices[face[0]], its.vertices[face[1]], its.vertices[face[2]] }; return face_normal_normalized(vertices); }
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inline Vec3f its_face_normal(const indexed_triangle_set &its, const int face_idx)
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{ return its_face_normal(its, its.indices[face_idx]); }
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indexed_triangle_set its_make_cube(double x, double y, double z);
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indexed_triangle_set its_make_prism(float width, float length, float height);
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indexed_triangle_set its_make_cylinder(double r, double h, double fa=(2*PI/360));
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indexed_triangle_set its_make_cone(double r, double h, double fa=(2*PI/360));
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indexed_triangle_set its_make_pyramid(float base, float height);
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indexed_triangle_set its_make_sphere(double radius, double fa);
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indexed_triangle_set its_convex_hull(const std::vector<Vec3f> &pts);
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inline indexed_triangle_set its_convex_hull(const indexed_triangle_set &its) { return its_convex_hull(its.vertices); }
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inline TriangleMesh make_cube(double x, double y, double z) { return TriangleMesh(its_make_cube(x, y, z)); }
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inline TriangleMesh make_prism(float width, float length, float height) { return TriangleMesh(its_make_prism(width, length, height)); }
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inline TriangleMesh make_cylinder(double r, double h, double fa=(2*PI/360)) { return TriangleMesh{its_make_cylinder(r, h, fa)}; }
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inline TriangleMesh make_cone(double r, double h, double fa=(2*PI/360)) { return TriangleMesh(its_make_cone(r, h, fa)); }
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inline TriangleMesh make_pyramid(float base, float height) { return TriangleMesh(its_make_pyramid(base, height)); }
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inline TriangleMesh make_sphere(double rho, double fa=(2*PI/360)) { return TriangleMesh(its_make_sphere(rho, fa)); }
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bool its_write_stl_ascii(const char *file, const char *label, const std::vector<stl_triangle_vertex_indices> &indices, const std::vector<stl_vertex> &vertices);
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inline bool its_write_stl_ascii(const char *file, const char *label, const indexed_triangle_set &its) { return its_write_stl_ascii(file, label, its.indices, its.vertices); }
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bool its_write_stl_binary(const char *file, const char *label, const std::vector<stl_triangle_vertex_indices> &indices, const std::vector<stl_vertex> &vertices);
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inline bool its_write_stl_binary(const char *file, const char *label, const indexed_triangle_set &its) { return its_write_stl_binary(file, label, its.indices, its.vertices); }
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inline BoundingBoxf3 bounding_box(const TriangleMesh &m) { return m.bounding_box(); }
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inline BoundingBoxf3 bounding_box(const indexed_triangle_set& its)
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{
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if (its.vertices.empty())
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return {};
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Vec3f bmin = its.vertices.front(), bmax = its.vertices.front();
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for (const Vec3f &p : its.vertices) {
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bmin = p.cwiseMin(bmin);
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bmax = p.cwiseMax(bmax);
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}
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return {bmin.cast<double>(), bmax.cast<double>()};
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}
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}
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// Serialization through the Cereal library
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#include <cereal/access.hpp>
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namespace cereal {
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template <class Archive> struct specialize<Archive, Slic3r::TriangleMesh, cereal::specialization::non_member_load_save> {};
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template<class Archive> void load(Archive &archive, Slic3r::TriangleMesh &mesh) {
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archive.loadBinary(reinterpret_cast<char*>(const_cast<Slic3r::TriangleMeshStats*>(&mesh.stats())), sizeof(Slic3r::TriangleMeshStats));
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archive(mesh.its.indices, mesh.its.vertices);
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}
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template<class Archive> void save(Archive &archive, const Slic3r::TriangleMesh &mesh) {
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archive.saveBinary(reinterpret_cast<const char*>(&mesh.stats()), sizeof(Slic3r::TriangleMeshStats));
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archive(mesh.its.indices, mesh.its.vertices);
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}
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}
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#endif
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