CGAL 6.2 - Tetrahedral Remeshing

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Tetrahedral_remeshing/mesh_and_remesh_c3t3.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/Polyhedral_mesh_domain_with_features_3.h>
#include <CGAL/make_mesh_3.h>
#include <CGAL/property_map.h>
#include <CGAL/tetrahedral_remeshing.h>
#include <CGAL/IO/File_medit.h>
#include <string>
#include <unordered_set>
// Domain
using K = CGAL::Exact_predicates_inexact_constructions_kernel;
using Polyhedron = CGAL::Mesh_polyhedron_3<K>::type;
using Mesh_domain = CGAL::Polyhedral_mesh_domain_with_features_3<K>;
#ifdef CGAL_CONCURRENT_MESH_3
using Concurrency_tag = CGAL::Parallel_if_available_tag;
#else
using Concurrency_tag = CGAL::Sequential_tag;
#endif
// Triangulation for Meshing
using Tr = CGAL::Mesh_triangulation_3<Mesh_domain, CGAL::Default, Concurrency_tag>::type;
using C3t3 = CGAL::Mesh_complex_3_in_triangulation_3<
Tr, Mesh_domain::Corner_index, Mesh_domain::Curve_index>;
// Criteria
using Mesh_criteria = CGAL::Mesh_criteria_3<Tr>;
// Triangulation for Remeshing
using Triangulation_3 = CGAL::Triangulation_3<Tr::Geom_traits,
Tr::Triangulation_data_structure>;
using Vertex_handle = Triangulation_3::Vertex_handle;
using Vertex_pair = std::pair<Vertex_handle, Vertex_handle>;
using Constraints_set = std::unordered_set<Vertex_pair, boost::hash<Vertex_pair>>;
using Constraints_pmap = CGAL::Boolean_property_map<Constraints_set>;
using Corners_set = std::unordered_set<Vertex_handle, boost::hash<Vertex_handle>>;
using Corners_pmap = CGAL::Boolean_property_map<Corners_set>;
// 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/fandisk.off");
std::ifstream input(fname);
Polyhedron polyhedron;
input >> polyhedron;
if (input.fail() || !CGAL::is_triangle_mesh(polyhedron)) {
std::cerr << "Error: Input invalid " << fname << std::endl;
return EXIT_FAILURE;
}
// Create domain
Mesh_domain domain(polyhedron);
// Get sharp features
domain.detect_features();
// Mesh criteria
Mesh_criteria criteria(edge_size = 0.025,
facet_angle = 25, facet_size = 0.05, facet_distance = 0.005,
cell_radius_edge_ratio = 3, cell_size = 0.05);
// Mesh generation
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria);
// Property map of constraints
Constraints_set constraints;
Constraints_pmap constraints_pmap(constraints);
Corners_set corners;
Corners_pmap corners_pmap(corners);
Triangulation_3 tr = CGAL::convert_to_triangulation_3(std::move(c3t3),
edge_is_constrained_map(constraints_pmap).
vertex_is_constrained_map(corners_pmap));
//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.
const double target_edge_length = 0.1;//coarsen the mesh
CGAL::tetrahedral_isotropic_remeshing(tr, target_edge_length,
number_of_iterations(5)
.smooth_constrained_edges(true)
.edge_is_constrained_map(constraints_pmap));
std::ofstream out("out_remeshed.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_with_features_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
CGAL::Parallel_if_available_tag
CGAL::Sequential_tag