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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/remesh.h>
#include <CGAL/Polygon_mesh_processing/border.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <boost/iterator/function_output_iterator.hpp>
#include <iostream>
#include <iterator>
#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;
typedef boost::graph_traits<Mesh>::face_descriptor face_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 = 0.1;
unsigned int nb_iter = 3;
std::cout << "Split border...";
std::vector<edge_descriptor> border;
PMP::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::vector<face_descriptor> seed, patch;
Mesh::Property_map<face_descriptor,int> selected
= mesh.add_property_map<face_descriptor,int>("f:selected",0).first;
seed.push_back(*(faces(mesh).first));
selected[seed.front()] = true;
CGAL::expand_face_selection(seed, mesh, 5, selected, std::back_inserter(patch));
std::cout << " and patch of size " << patch.size() << std::endl;
PMP::isotropic_remeshing(patch,
target_edge_length,
mesh,
CGAL::parameters::number_of_iterations(nb_iter)
.face_patch_map(selected)
.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;
}
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