CGAL 5.4.1 - 3D Mesh Generation
Mesh_3/mesh_optimization_lloyd_example.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/Labeled_mesh_domain_3.h>
#include <CGAL/make_mesh_3.h>
#include <CGAL/Image_3.h>
// Domain
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
// Mesh Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;
// To avoid verbose function and named parameters call
using namespace CGAL::parameters;
int main(int argc, char*argv[])
{
const std::string fname = (argc>1)?argv[1]:CGAL::data_file_path("images/liver.inr.gz");
// Domain
if(!image.read(fname)){
std::cerr << "Error: Cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
Mesh_domain domain = Mesh_domain::create_labeled_image_mesh_domain(image);
// Mesh criteria
Mesh_criteria criteria(facet_angle=30, facet_distance=1.2,
cell_radius_edge_ratio=2);
// Mesh generation and optimization in one call
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria,
lloyd(time_limit=30),
exude(time_limit=10, sliver_bound=10));
// Mesh generation and optimization in several call
C3t3 c3t3_bis = CGAL::make_mesh_3<C3t3>(domain, criteria,
CGAL::lloyd_optimize_mesh_3(c3t3_bis, domain, time_limit=30);
CGAL::exude_mesh_3(c3t3_bis, sliver_bound=10, time_limit=10);
// Output
std::ofstream medit_file("out.mesh");
c3t3.output_to_medit(medit_file);
std::ofstream medit_file_bis("out_bis.mesh");
c3t3_bis.output_to_medit(medit_file_bis);
return 0;
}