\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - Polygon Mesh Processing

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Polygon_mesh_processing/polygon_soup_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.h>
#include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
#include <CGAL/IO/OFF_reader.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 <vector>
#include <fstream>
#include <iostream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Polyhedron_3<K> Polyhedron;
int main(int argc, char* argv[])
{
const char* filename = (argc > 1) ? argv[1] : "data/tet-shuffled.off";
std::ifstream input(filename);
if (!input)
{
std::cerr << "Cannot open file " << std::endl;
return 1;
}
std::vector<K::Point_3> points;
std::vector< std::vector<std::size_t> > polygons;
if (!CGAL::read_OFF(input, points, polygons))
{
std::cerr << "Error parsing the OFF file " << std::endl;
return 1;
}
CGAL::Polygon_mesh_processing::orient_polygon_soup(points, polygons);
Polyhedron mesh;
CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh(points, polygons, mesh);
if (CGAL::is_closed(mesh) && (!CGAL::Polygon_mesh_processing::is_outward_oriented(mesh)))
CGAL::Polygon_mesh_processing::reverse_face_orientations(mesh);
std::ofstream out("tet-oriented1.off");
out << mesh;
out.close();
CGAL::Polygon_mesh_processing::reverse_face_orientations(mesh);
std::ofstream out2("tet-oriented2.off");
out2 << mesh;
out2.close();
return 0;
}