CGAL 6.1 - Polygon Mesh Processing

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Polygon_mesh_processing/orient_polygon_soup_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/Polyhedron_items_with_id_3.h>
#include <CGAL/Polygon_mesh_processing/orient_polygon_soup.h>
#include <CGAL/Polygon_mesh_processing/polygon_soup_to_polygon_mesh.h>
#include <CGAL/Polygon_mesh_processing/orientation.h>
#include <CGAL/IO/polygon_soup_io.h>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Polyhedron_3<K, CGAL::Polyhedron_items_with_id_3> Mesh;
// Optional visitor for orientating a polygon soup to demonstrate usage for some functions.
// inherits from the default class as some functions are not overloaded
struct Visitor : public CGAL::Polygon_mesh_processing::Default_orientation_visitor
{
void non_manifold_edge(std::size_t id1, std::size_t id2, std::size_t nb_poly)
{
std::cout << "The edge " << id1 << ", " << id2 << " is not manifold: " << nb_poly << " incident polygons." << std::endl;
}
void non_manifold_vertex(std::size_t id, std::size_t nb_cycles)
{
std::cout << "The vertex " << id << " is not manifold: " << nb_cycles << " connected components of vertices in the link." << std::endl;
}
void duplicated_vertex(std::size_t v1, std::size_t v2)
{
std::cout << "The vertex " << v1 << " has been duplicated, its new id is " << v2 << "." << std::endl;
}
void vertex_id_in_polygon_replaced(std::size_t p_id, std::size_t i1, std::size_t i2)
{
std::cout << "In the polygon " << p_id << ", the index " << i1 << " has been replaced by " << i2 << "." << std::endl;
}
void polygon_orientation_reversed(std::size_t p_id)
{
std::cout << "The polygon " << p_id << " has been reversed." << std::endl;
}
};
int main(int argc, char* argv[])
{
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/tet-shuffled.off");
std::vector<K::Point_3> points;
std::vector<std::vector<std::size_t> > polygons;
if(!CGAL::IO::read_polygon_soup(filename, points, polygons) || points.empty())
{
std::cerr << "Cannot open file " << std::endl;
return EXIT_FAILURE;
}
Visitor visitor;
CGAL::Polygon_mesh_processing::orient_polygon_soup(points, polygons, CGAL::parameters::visitor(visitor));
Mesh mesh;
CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh(points, polygons, mesh);
// Number the faces because 'orient_to_bound_a_volume' needs a face <--> index map
int index = 0;
for(Mesh::Face_iterator fb=mesh.facets_begin(), fe=mesh.facets_end(); fb!=fe; ++fb)
fb->id() = index++;
if(CGAL::is_closed(mesh))
CGAL::Polygon_mesh_processing::orient_to_bound_a_volume(mesh);
std::ofstream out("tet-oriented1.off");
out.precision(17);
out << mesh;
out.close();
CGAL::Polygon_mesh_processing::reverse_face_orientations(mesh);
std::ofstream out2("tet-oriented2.off");
out2.precision(17);
out2 << mesh;
out2.close();
return EXIT_SUCCESS;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Polyhedron_3
CGAL::IO::read_polygon_soup
bool read_polygon_soup(const std::string &fname, PointRange &points, PolygonRange &polygons, const NamedParameters &np=parameters::default_values())
CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh
void polygon_soup_to_polygon_mesh(const PointRange &points, const PolygonRange &polygons, PolygonMesh &out, const NamedParameters_PS &np_ps=parameters::default_values(), const NamedParameters_PM &np_pm=parameters::default_values())
builds a polygon mesh from a soup of polygons.
Definition: polygon_soup_to_polygon_mesh.h:330
CGAL::Polygon_mesh_processing::orient_polygon_soup
bool orient_polygon_soup(PointRange &points, PolygonRange &polygons, const NamedParameters &np=parameters::default_values())
tries to consistently orient a soup of polygons in 3D space.
Definition: orient_polygon_soup.h:540
CGAL::Polygon_mesh_processing::reverse_face_orientations
void reverse_face_orientations(PolygonMesh &pmesh)
reverses for each face the order of the vertices along the face boundary.
Definition: orientation.h:274
CGAL::Polygon_mesh_processing::orient_to_bound_a_volume
void orient_to_bound_a_volume(TriangleMesh &tm, const NamedParameters &np=parameters::default_values())
orients the connected components of tm to make it bound a volume.
Definition: orientation.h:1347
CGAL::is_closed
bool is_closed(const FaceGraph &g)
CGAL::Polygon_mesh_processing::Default_orientation_visitor
Default visitor model of PMPPolygonSoupOrientationVisitor.
Definition: orient_polygon_soup.h:47