Mesh_3/mesh_polyhedral_complex.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 
#include <CGAL/Mesh_triangulation_3.h>
#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
#include <CGAL/Mesh_criteria_3.h>
 
#include <CGAL/Polyhedral_complex_mesh_domain_3.h>
#include <CGAL/make_mesh_3.h>
 
#include <cstdlib>
#include <cassert>
 
// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Mesh_polyhedron_3<K>::type Polyhedron;
typedef CGAL::Polyhedral_complex_mesh_domain_3<K> Mesh_domain;
 
 
#ifdef CGAL_CONCURRENT_MESH_3
typedef CGAL::Parallel_tag Concurrency_tag;
#else
typedef CGAL::Sequential_tag Concurrency_tag;
#endif
 
// Triangulation
typedef CGAL::Mesh_triangulation_3<Mesh_domain,CGAL::Default,Concurrency_tag>::type Tr;
 
typedef CGAL::Mesh_complex_3_in_triangulation_3<
  Tr,Mesh_domain::Corner_index,Mesh_domain::Curve_index> C3t3;
 
// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;
 
namespace params = CGAL::parameters;
 
const char* const filenames[] = {
  "meshes/patch-01.off",
  "meshes/patch-13.off",
  "meshes/patch-20.off",
  "meshes/patch-21.off",
  "meshes/patch-23.off",
  "meshes/patch-30.off"
};
 
const std::pair<int, int> incident_subdomains[] = {
  std::make_pair(0, 1),
  std::make_pair(1, 3),
  std::make_pair(2, 0),
  std::make_pair(2, 1),
  std::make_pair(2, 3),
  std::make_pair(3, 0),
};
 
int main()
{
  const std::size_t nb_patches = sizeof(filenames) / sizeof(const char*);
  assert(sizeof(incident_subdomains) == nb_patches * sizeof(std::pair<int, int>));
  std::vector<Polyhedron> patches(nb_patches);
  for(std::size_t i = 0; i < nb_patches; ++i) {
    std::ifstream input(CGAL::data_file_path(filenames[i]));
    if(!(input >> patches[i])) {
      std::cerr << "Error reading " << CGAL::data_file_path(filenames[i]) << " as a polyhedron!\n";
      return EXIT_FAILURE;
    }
  }
  // Create domain
  Mesh_domain domain(patches.begin(), patches.end(),
                     incident_subdomains, incident_subdomains+nb_patches);
 
  domain.detect_features(); //includes detection of borders
 
  // Mesh criteria
  Mesh_criteria criteria(params::edge_size(8).
                                 facet_angle(25).facet_size(8).facet_distance(0.2).
                                 cell_radius_edge_ratio(3).cell_size(10));
 
  // Mesh generation
  C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria);
 
  // Output
  std::ofstream medit_file("out.mesh");
  CGAL::IO::write_MEDIT(medit_file, c3t3);
  medit_file.close();
 
  return EXIT_SUCCESS;
}