Mesh_3/mesh_3D_image_with_image_initialization.cpp

#include "random_labeled_image.h"
#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/Mesh_3/Construct_initial_points_labeled_image.h>
 
#include <CGAL/Labeled_mesh_domain_3.h>
#include <CGAL/make_mesh_3.h>
#include <CGAL/Image_3.h>
 
#include <CGAL/SMDS_3/Dump_c3t3.h>
 
// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Labeled_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> C3t3;
 
// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;
 
namespace params = CGAL::parameters;
 
int main()
{
  CGAL::Image_3 image = random_labeled_image();
 
  // Domain
  Mesh_domain domain = Mesh_domain::create_labeled_image_mesh_domain(image);
 
  // Mesh criteria
  Mesh_criteria criteria(params::facet_angle(30).facet_size(3).facet_distance(1)
                         .cell_radius_edge_ratio(3).cell_size(3)
  );
 
  // Mesh generation with a custom initialization that places points in each of the image components.
  CGAL::Construct_initial_points_labeled_image<C3t3, Mesh_domain> img_pts_generator(image, domain);
 
  C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, params::initial_points_generator(img_pts_generator)
  );
 
  // Output
  CGAL::dump_c3t3(c3t3, "out");
 
  return 0;
}