mirror of https://github.com/CGAL/cgal
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
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#include <CGAL/Mesh_triangulation_3.h>
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#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
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#include <CGAL/Mesh_criteria_3.h>
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#include <CGAL/Surface_mesh.h>
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#include <CGAL/boost/graph/helpers.h>
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#include <CGAL/Polyhedral_mesh_domain_3.h>
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#include <CGAL/make_mesh_3.h>
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#include <CGAL/refine_mesh_3.h>
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// Domain
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typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
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typedef CGAL::Surface_mesh<K::Point_3> Polyhedron;
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typedef CGAL::Polyhedral_mesh_domain_3<Polyhedron, K> Mesh_domain;
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#ifdef CGAL_CONCURRENT_MESH_3
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typedef CGAL::Parallel_tag Concurrency_tag;
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#else
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typedef CGAL::Sequential_tag Concurrency_tag;
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#endif
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// Triangulation
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typedef CGAL::Mesh_triangulation_3<Mesh_domain,CGAL::Default,Concurrency_tag>::type Tr;
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typedef CGAL::Mesh_complex_3_in_triangulation_3<Tr> C3t3;
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// Criteria
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typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;
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namespace params = CGAL::parameters;
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int main(int argc, char*argv[])
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{
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const std::string fname = (argc>1)?argv[1]:CGAL::data_file_path("meshes/elephant.off");
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// Create input polyhedron
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Polyhedron polyhedron;
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std::ifstream input(fname);
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input >> polyhedron;
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if(input.fail()){
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std::cerr << "Error: Cannot read file " << fname << std::endl;
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return EXIT_FAILURE;
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}
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input.close();
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if (!CGAL::is_triangle_mesh(polyhedron)){
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std::cerr << "Input geometry is not triangulated." << std::endl;
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return EXIT_FAILURE;
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}
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// Create domain
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Mesh_domain domain(polyhedron);
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// Mesh criteria (no cell_size set)
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Mesh_criteria criteria(params::facet_angle(25).facet_size(0.15).facet_distance(0.008).
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cell_radius_edge_ratio(3));
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// Mesh generation
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C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, params::no_perturb().no_exude());
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// Output
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std::ofstream medit_file("out_1.mesh");
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CGAL::IO::write_MEDIT(medit_file, c3t3);
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medit_file.close();
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// Set tetrahedron size (keep cell_radius_edge_ratio), ignore facets
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Mesh_criteria new_criteria(params::cell_radius_edge_ratio(3).cell_size(0.03));
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// Mesh refinement
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CGAL::refine_mesh_3(c3t3, domain, new_criteria);
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// Output
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medit_file.open("out_2.mesh");
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CGAL::IO::write_MEDIT(medit_file, c3t3);
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medit_file.close();
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return EXIT_SUCCESS;
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}
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