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#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/Polyhedron_3.h>
#include <CGAL/boost/graph/helpers.h>
#include <CGAL/Polyhedral_mesh_domain_3.h>
#include <CGAL/make_mesh_3.h>
#include <CGAL/refine_mesh_3.h>
#include <CGAL/IO/File_medit.h>
// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Polyhedron_3<K> Polyhedron;
typedef CGAL::Polyhedral_mesh_domain_3<Polyhedron, 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(int argc, char*argv[])
{
const std::string fname = (argc>1)?argv[1]:CGAL::data_file_path("meshes/elephant.off");
// Create input polyhedron
Polyhedron polyhedron;
std::ifstream input(fname);
input >> polyhedron;
if(input.fail()){
std::cerr << "Error: Cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
input.close();
if (!CGAL::is_triangle_mesh(polyhedron)){
std::cerr << "Input geometry is not triangulated." << std::endl;
return EXIT_FAILURE;
}
// Create domain
Mesh_domain domain(polyhedron);
// Mesh criteria (no cell_size set)
Mesh_criteria criteria(params::facet_angle(25).facet_size(0.15).facet_distance(0.008).
cell_radius_edge_ratio(3));
// Mesh generation
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, params::no_perturb().no_exude());
// Output
std::ofstream medit_file("out_1.mesh");
CGAL::IO::write_MEDIT(medit_file, c3t3);
medit_file.close();
// Set tetrahedron size (keep cell_radius_edge_ratio), ignore facets
Mesh_criteria new_criteria(params::cell_radius_edge_ratio(3).cell_size(0.03));
// Mesh refinement (and make the output manifold)
CGAL::refine_mesh_3(c3t3, domain, new_criteria, params::manifold());
// Output
medit_file.open("out_2.mesh");
CGAL::IO::write_MEDIT(medit_file, c3t3);
medit_file.close();
return EXIT_SUCCESS;
}
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