CGAL 6.2 - 3D Constrained Triangulations

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Constrained_triangulation_3/ccdt_3_from_soup_fimap.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/IO/polygon_mesh_io.h>
#include <CGAL/IO/write_MEDIT.h>
#include <CGAL/Polygon_mesh_processing/connected_components.h>
#include <CGAL/Polygon_mesh_processing/polygon_mesh_to_polygon_soup.h>
#include <CGAL/Surface_mesh/Surface_mesh.h>
#include <CGAL/draw_constrained_triangulation_3.h>
#include <CGAL/make_conforming_constrained_Delaunay_triangulation_3.h>
#include <algorithm>
#include <vector>
using K = CGAL::Exact_predicates_inexact_constructions_kernel;
using Point = K::Point_3;
using Surface_mesh = CGAL::Surface_mesh<Point>;
using face_descriptor = Surface_mesh::Face_index;
namespace PMP = CGAL::Polygon_mesh_processing;
int main(int argc, char* argv[])
{
auto filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/cubes_one_patch_id_per_cc.off");
CGAL::Surface_mesh<K::Point_3> mesh;
if(!CGAL::IO::read_polygon_mesh(filename, mesh)) {
std::cerr << "Error: cannot read file " << filename << std::endl;
return EXIT_FAILURE;
}
auto fpmap = mesh.add_property_map<face_descriptor, std::size_t>("f:cc_id").first;
std::cout << "Read " << mesh.number_of_vertices() << " vertices and "
<< mesh.number_of_faces() << " polygons" << std::endl;
PMP::connected_components(mesh, fpmap);
std::cout << "Number of connected components: "
<< fpmap[*std::max_element(mesh.faces_begin(), mesh.faces_end(),
[&](face_descriptor f1, face_descriptor f2) {
return fpmap[f1] < fpmap[f2];
})] + 1
<< std::endl;
std::vector<K::Point_3> points;
std::vector<std::vector<std::size_t>> polygons;
PMP::polygon_mesh_to_polygon_soup(mesh, points, polygons);
auto polygon_to_patch_id = [&](std::size_t i) {
return fpmap[*std::next(mesh.faces_begin(), i)];
};
auto soup_fpmap = boost::make_function_property_map<std::size_t>(polygon_to_patch_id);
auto ccdt = CGAL::make_conforming_constrained_Delaunay_triangulation_3(
points, polygons, CGAL::parameters::plc_face_id(soup_fpmap));
std::cout << "Number of vertices in the CDT: "
<< ccdt.triangulation().number_of_vertices() << '\n'
<< "Number of constrained facets in the CDT: "
<< ccdt.number_of_constrained_facets() << '\n';
std::ofstream ofs(argc > 2 ? argv[2] : "out.mesh");
ofs.precision(17);
CGAL::IO::write_MEDIT(ofs, ccdt);
CGAL::draw(ccdt);
return EXIT_SUCCESS;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Surface_mesh
CGAL::Surface_mesh::number_of_vertices
size_type number_of_vertices() const
CGAL::Surface_mesh::number_of_faces
size_type number_of_faces() const
CGAL::Surface_mesh::add_property_map
std::pair< Property_map< I, T >, bool > add_property_map(std::string name=std::string(), const T t=T())
CGAL::IO::read_polygon_mesh
bool read_polygon_mesh(const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())
CGAL::make_conforming_constrained_Delaunay_triangulation_3
auto make_conforming_constrained_Delaunay_triangulation_3(const PolygonMesh &mesh, const NamedParameters &np=parameters::default_values())
creates a 3D constrained Delaunay triangulation conforming to the faces of a polygon mesh.
Definition: make_conforming_constrained_Delaunay_triangulation_3.h:146
CGAL::draw
void draw(const T3 &at3, const GSOptions &gso)
CGAL::IO::write_MEDIT
void write_MEDIT(std::ostream &os, const T3 &t3, const NamedParameters &np=parameters::default_values())
CGAL::Polygon_mesh_processing