CGAL 6.2 - Meshing and Remeshing of Polygonal Meshes

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PMP_Remeshing/isotropic_remeshing_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/boost/graph/border.h>
#include <CGAL/Polygon_mesh_processing/remesh.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <boost/iterator/function_output_iterator.hpp>
#include <iostream>
#include <string>
#include <vector>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Surface_mesh<K::Point_3> Mesh;
typedef boost::graph_traits<Mesh>::halfedge_descriptor halfedge_descriptor;
typedef boost::graph_traits<Mesh>::edge_descriptor edge_descriptor;
namespace PMP = CGAL::Polygon_mesh_processing;
struct halfedge2edge
{
halfedge2edge(const Mesh& m, std::vector<edge_descriptor>& edges)
: m_mesh(m), m_edges(edges)
{}
void operator()(const halfedge_descriptor& h) const
{
m_edges.push_back(edge(h, m_mesh));
}
const Mesh& m_mesh;
std::vector<edge_descriptor>& m_edges;
};
int main(int argc, char* argv[])
{
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/pig.off");
Mesh mesh;
if(!PMP::IO::read_polygon_mesh(filename, mesh) || !CGAL::is_triangle_mesh(mesh))
{
std::cerr << "Invalid input." << std::endl;
return 1;
}
double target_edge_length = (argc > 2) ? std::stod(std::string(argv[2])) : 0.04;
unsigned int nb_iter = (argc > 3) ? std::stoi(std::string(argv[3])) : 10;
std::cout << "Split border...";
std::vector<edge_descriptor> border;
CGAL::border_halfedges(faces(mesh), mesh, boost::make_function_output_iterator(halfedge2edge(mesh, border)));
PMP::split_long_edges(border, target_edge_length, mesh);
std::cout << "done." << std::endl;
std::cout << "Start remeshing of " << filename << " (" << num_faces(mesh) << " faces)..." << std::endl;
PMP::isotropic_remeshing(faces(mesh), target_edge_length, mesh,
CGAL::parameters::number_of_iterations(nb_iter)
.protect_constraints(true)); //i.e. protect border, here
CGAL::IO::write_polygon_mesh("out.off", mesh, CGAL::parameters::stream_precision(17));
std::cout << "Remeshing done." << std::endl;
return 0;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Surface_mesh
CGAL::Polygon_mesh_processing::split_long_edges
void split_long_edges(const EdgeRange &edges, SizingFunction &sizing, PolygonMesh &pmesh, const NamedParameters &np=parameters::default_values())
splits the edges listed in edges into sub-edges that are not longer than the given threshold max_leng...
Definition: remesh.h:457
CGAL::Polygon_mesh_processing::isotropic_remeshing
void isotropic_remeshing(const FaceRange &faces, SizingFunction &sizing, PolygonMesh &pmesh, const NamedParameters &np=parameters::default_values())
remeshes a triangulated region of a polygon mesh.
Definition: remesh.h:217
CGAL::is_triangle_mesh
bool is_triangle_mesh(const FaceGraph &g)
CGAL::border_halfedges
HalfedgeOutputIterator border_halfedges(const FaceRange &face_range, const Graph &g, HalfedgeOutputIterator out, const NamedParameters &np=parameters::default_values())
CGAL::IO::write_polygon_mesh
bool write_polygon_mesh(const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())