mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-14 19:34:34 +00:00
Ken Arroyo Ohori
47 lines
2.2 KiB
C++
47 lines
2.2 KiB
C++
#include "CgalKernel.h"
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#include "CgalConversionResult.h"
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void IfcGeom::CgalShape::Triangulate(const IfcGeom::IteratorSettings & settings, const IfcGeom::ConversionResultPlacement * place, IfcGeom::Representation::Triangulation<double>* t, int surface_style_id) const {
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cgal_shape_t s = shape_;
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const cgal_placement_t& trsf = dynamic_cast<const CgalPlacement*>(place)->trsf();
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// Apply transformation
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if (place != NULL) for (auto &vertex: vertices(s)) {
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vertex->point() = vertex->point().transform(trsf);
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}
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// Triangulate the shape and compute the normals
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std::map<cgal_vertex_descriptor_t, Kernel::Vector_3> vertex_normals;
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boost::associative_property_map<std::map<cgal_vertex_descriptor_t, Kernel::Vector_3>> vertex_normals_map(vertex_normals);
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std::map<cgal_face_descriptor_t, Kernel::Vector_3> face_normals;
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boost::associative_property_map<std::map<cgal_face_descriptor_t, Kernel::Vector_3>> face_normals_map(face_normals);
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try {
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CGAL::Polygon_mesh_processing::triangulate_faces(s);
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CGAL::Polygon_mesh_processing::compute_normals(s, vertex_normals_map, face_normals_map);
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} catch (...) {
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// TODO: Catch outside
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// Logger::Message(Logger::LOG_ERROR,"Failed to triangulate shape:",ifc_file->entityById(_id)->entity);
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Logger::Message(Logger::LOG_ERROR, "Failed to triangulate shape");
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return;
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}
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// Iterates over the faces of the shape
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int num_faces = 0, num_vertices = 0;
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for (auto &face: faces(s)) {
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CGAL::Polyhedron_3<Kernel>::Halfedge_around_facet_const_circulator current_halfedge = face->facet_begin();
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do {
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t->addVertex(surface_style_id,
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CGAL::to_double(current_halfedge->vertex()->point().cartesian(0)),
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CGAL::to_double(current_halfedge->vertex()->point().cartesian(1)),
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CGAL::to_double(current_halfedge->vertex()->point().cartesian(2)));
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for (int i = 0; i < 3; ++i) t->normals().push_back(CGAL::to_double(face_normals_map[face].cartesian(i)));
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t->faces().push_back(num_vertices);
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++num_vertices;
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++current_halfedge;
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} while (current_halfedge != face->facet_begin());
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t->material_ids().push_back(surface_style_id);
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++num_faces;
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}
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}
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