Created
July 13, 2018 13:30
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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h> | |
#include <CGAL/Surface_mesh.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::Surface_mesh<K::Point_3> Mesh; | |
int main(int argc, char* argv[]) | |
{; | |
std::ifstream input(argv[1]); | |
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; | |
} | |
// merge duplicated points (useful to also stitch uncorrectly oriented patches) | |
const std::size_t nb_points = points.size(); | |
std::vector<std::size_t> point_index(nb_points, 0); | |
std::map<K::Point_3, std::size_t> point_to_id; | |
std::vector<K::Point_3> unique_points; | |
unique_points.reserve(nb_points); | |
for (std::size_t i=0; i<nb_points; ++i) | |
{ | |
std::size_t id = | |
point_to_id.insert( std::make_pair(points[i], unique_points.size()) ).first->second; | |
if ( id == unique_points.size() ) | |
unique_points.push_back( points[i] ); | |
point_index[i]=id; | |
} | |
if (unique_points.size() != nb_points) | |
{ | |
typedef std::vector<std::size_t> Polygon; | |
BOOST_FOREACH(Polygon& p, polygons) | |
{ | |
BOOST_FOREACH(std::size_t& id, p) | |
id = point_index[id]; | |
} | |
points.swap(unique_points); | |
} | |
CGAL::Polygon_mesh_processing::orient_polygon_soup(points, polygons); | |
Mesh 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("oriented.off"); | |
out << std::setprecision(17) << mesh; | |
out.close(); | |
return 0; | |
} |
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