CGAL 6.2 - Tetrahedral Remeshing: Tetrahedral_remeshing/mesh_and_remesh_with_adaptive_sizing.cpp

CGAL 6.2 - Tetrahedral Remeshing

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Tetrahedral_remeshing/mesh_and_remesh_with_adaptive_sizing.cpp
#define CGAL_TETRAHEDRAL_REMESHING_VERBOSE
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/Polyhedral_mesh_domain_3.h>
#include <CGAL/Mesh_triangulation_3.h>
#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
#include <CGAL/Mesh_criteria_3.h>
#include <CGAL/make_mesh_3.h>
#include <CGAL/tetrahedral_remeshing.h>
#include <CGAL/Adaptive_remeshing_sizing_field.h>
#include <CGAL/IO/File_medit.h>
#include <string>
// Domain
using K = CGAL::Exact_predicates_inexact_constructions_kernel;
using Point = K::Point_3;
using FT = K::FT;
using Polyhedron = CGAL::Polyhedron_3<K>;
using Mesh_domain = CGAL::Polyhedral_mesh_domain_3<Polyhedron, K>;
// Triangulation for Meshing
using Tr = CGAL::Mesh_triangulation_3<Mesh_domain>::type;
using C3t3 = CGAL::Mesh_complex_3_in_triangulation_3<Tr>;
// Criteria
using Mesh_criteria = CGAL::Mesh_criteria_3<Tr>;
// Triangulation for Remeshing
using T3 = CGAL::Triangulation_3<Tr::Geom_traits,
Tr::Triangulation_data_structure>;
// 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("meshes/elk.off");
std::ifstream input(fname);
Polyhedron polyhedron;
input >> polyhedron;
if (input.fail()) {
std::cerr << "Error: Cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
if (!CGAL::is_triangle_mesh(polyhedron)) {
std::cerr << "Input geometry is not triangulated." << std::endl;
return EXIT_FAILURE;
}
// Create domain
Mesh_domain domain(polyhedron);
std::cout << "Meshing...";
std::cout.flush();
// Mesh criteria
Mesh_criteria criteria(facet_angle = 25,
facet_distance = 0.2,
cell_size = 10.,
cell_radius_edge_ratio = 3.);
// Mesh generation
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, no_perturb().no_exude());
std::cout << "\rMeshing done." << std::endl;
std::ofstream out_mesh("out_meshing.mesh");
CGAL::IO::write_MEDIT(out_mesh, c3t3.triangulation());
out_mesh.close();
T3 tr = CGAL::convert_to_triangulation_3(std::move(c3t3));
//note we use the move semantic, with std::move(c3t3),
// to avoid a copy of the triangulation by the function
// `CGAL::convert_to_triangulation_3()`
// After the call to this function, c3t3 is an empty and valid C3t3.
//It is possible to use : CGAL::convert_to_triangulation_3(c3t3),
// Then the triangulation is copied and duplicated, and c3t3 remains as is.
std::cout << "Remeshing...";
std::cout.flush();
CGAL::tetrahedral_isotropic_remeshing(tr,
CGAL::create_adaptive_remeshing_sizing_field(tr),
CGAL::parameters::number_of_iterations(5));
std::cout << "\rRemeshing done." << std::endl;
std::ofstream out("out_remeshing.mesh");
CGAL::IO::write_MEDIT(out, tr);
out.close();
return EXIT_SUCCESS;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Mesh_complex_3_in_triangulation_3
CGAL::Mesh_criteria_3
CGAL::Polyhedral_mesh_domain_3
CGAL::Polyhedron_3
CGAL::Triangulation_3
unspecified_type
CGAL::is_triangle_mesh
bool is_triangle_mesh(const FaceGraph &g)
CGAL::IO::write_MEDIT
void write_MEDIT(std::ostream &os, const T3 &t3, const NamedParameters &np=parameters::default_values())
CGAL::tetrahedral_isotropic_remeshing
void tetrahedral_isotropic_remeshing(CGAL::Triangulation_3< Traits, TDS, SLDS > &tr, const SizingFunction &sizing, const NamedParameters &np=parameters::default_values())
remeshes a tetrahedral mesh.
Definition: tetrahedral_remeshing.h:187
CGAL::convert_to_triangulation_3
CGAL::Triangulation_3< typename Tr::Geom_traits, typename Tr::Triangulation_data_structure > convert_to_triangulation_3(CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex > c3t3, const NamedParameters &np=parameters::default_values())
converts the triangulation contained in the input to a Triangulation_3.
Definition: tetrahedral_remeshing.h:357
CGAL::parameters