CGAL 5.6.3 - 3D Simplicial Mesh Data Structures

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SMDS_3/tetrahedron_soup_to_c3t3_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Delaunay_triangulation_3.h>
#include <CGAL/point_generators_3.h>
#include <CGAL/Tetrahedral_remeshing/Remeshing_triangulation_3.h>
#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
#include <CGAL/tetrahedron_soup_to_triangulation_3.h>
#include <CGAL/IO/File_medit.h>
#include <vector>
#include <unordered_map>
using K = CGAL::Exact_predicates_inexact_constructions_kernel;
using DT3 = CGAL::Delaunay_triangulation_3<K>;
using Remeshing_triangulation = CGAL::Tetrahedral_remeshing::Remeshing_triangulation_3<K>;
using C3T3 = CGAL::Mesh_complex_3_in_triangulation_3<Remeshing_triangulation>;
using Point_3 = K::Point_3;
using Tetrahedron_3 = K::Tetrahedron_3;
using Vertex_handle = DT3::Vertex_handle;
using Subdomain_index = C3T3::Subdomain_index;
int main(int , char* [])
{
const int nbv = 100;
//a triangulation
DT3 delaunay;
std::unordered_map<Vertex_handle, int> v2i;
std::vector<DT3::Point> points(nbv);
std::vector<Tetrahedron_3> tetrahedra;
std::vector<std::array<int, 4> > tets_by_indices;
std::vector< Subdomain_index> subdomains;
//insert random points
CGAL::Random_points_in_cube_3<Point_3> randp(2.);
int i = 0;
while (i < nbv)
{
points[i] = *randp++;
Vertex_handle v = delaunay.insert(points[i]);
v2i[v] = i++;
}
tetrahedra.reserve(delaunay.number_of_finite_cells());
tets_by_indices.reserve(delaunay.number_of_finite_cells());
subdomains.reserve(delaunay.number_of_finite_cells());
for (DT3::Cell_handle c : delaunay.finite_cell_handles())
{
tetrahedra.push_back(delaunay.tetrahedron(c));
tets_by_indices.push_back( { v2i.at(c->vertex(0)),
v2i.at(c->vertex(1)),
v2i.at(c->vertex(2)),
v2i.at(c->vertex(3)) } );
subdomains.push_back(Subdomain_index(1));
}
//build triangulation from tetrahedra
Remeshing_triangulation tr
= CGAL::tetrahedron_soup_to_triangulation_3<Remeshing_triangulation>(tetrahedra);
//build triangulation from indices
Remeshing_triangulation tr2
= CGAL::tetrahedron_soup_to_triangulation_3<Remeshing_triangulation>(
points, tets_by_indices,
CGAL::parameters::subdomain_indices(std::cref(subdomains)));
//build a C3T3
C3T3 c3t3;
c3t3.triangulation() = tr;
std::ofstream ofs("c3t3_output.mesh");
CGAL::IO::write_MEDIT(ofs, c3t3);
return EXIT_SUCCESS;
}
CGAL::Delaunay_triangulation_3
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Mesh_complex_3_in_triangulation_3
A data structure to represent and maintain a 3D complex embedded in a 3D triangulation.
Definition: Mesh_complex_3_in_triangulation_3.h:191
CGAL::Tetrahedral_remeshing::Remeshing_triangulation_3
CGAL::IO::write_MEDIT
void write_MEDIT(std::ostream &os, const T3 &t3, const NamedParameters &np=parameters::default_values())
outputs a mesh complex to the medit (.mesh) file format.
Definition: File_medit.h:998