mirror of https://github.com/CGAL/cgal
114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
// Copyright (c) 2014 INRIA Sophia-Antipolis (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Clement Jamin
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#ifndef CGAL_TRIANGULATION_OFF_OSTREAM_3_H
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#define CGAL_TRIANGULATION_OFF_OSTREAM_3_H
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#include <CGAL/license/Triangulation_3.h>
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#include <CGAL/Triangulation_3.h>
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#include <sstream>
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#include <iostream>
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namespace CGAL {
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template < class GT, class TDS >
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std::ostream &
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export_triangulation_3_to_off(std::ostream & os,
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const Triangulation_3<GT,TDS> & tr,
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bool export_surface_only = false)
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{
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typedef Triangulation_3<GT,TDS> Tr;
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typedef typename Tr::Vertex_handle Vertex_handle;
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typedef typename Tr::Finite_vertices_iterator Finite_vertex_iterator;
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typedef typename Tr::All_cells_iterator Cells_iterator;
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typedef typename Tr::Finite_cells_iterator Finite_cells_iterator;
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size_t n = tr.number_of_vertices();
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std::stringstream output;
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// write the vertices
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std::map<Vertex_handle, int> index_of_vertex;
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std::size_t i = 0;
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for(Finite_vertex_iterator it = tr.finite_vertices_begin();
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it != tr.finite_vertices_end(); ++it, ++i)
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{
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output << it->point().x() << " "
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<< it->point().y() << " "
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<< it->point().z() << std::endl;
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index_of_vertex[it.base()] = i;
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}
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CGAL_assertion( i == n );
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size_t number_of_triangles = 0;
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if (export_surface_only)
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{
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for (Cells_iterator cit = tr.cells_begin() ;
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cit != tr.cells_end() ; ++cit)
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{
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if (tr.is_infinite(cit))
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{
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output << "3 ";
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for (int i = 0 ; i < 4 ; ++i)
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{
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if (!tr.is_infinite(cit->vertex(i)))
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output << index_of_vertex[cit->vertex(i)] << " ";
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}
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output << std::endl;
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++number_of_triangles;
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}
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}
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}
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else
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{
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for (Finite_cells_iterator cit = tr.finite_cells_begin() ;
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cit != tr.finite_cells_end() ; ++cit)
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{
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output << "3 "
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<< index_of_vertex[cit->vertex(0)] << " "
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<< index_of_vertex[cit->vertex(1)] << " "
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<< index_of_vertex[cit->vertex(2)]
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<< std::endl;
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output << "3 "
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<< index_of_vertex[cit->vertex(0)] << " "
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<< index_of_vertex[cit->vertex(2)] << " "
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<< index_of_vertex[cit->vertex(3)]
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<< std::endl;
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output << "3 "
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<< index_of_vertex[cit->vertex(1)] << " "
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<< index_of_vertex[cit->vertex(2)] << " "
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<< index_of_vertex[cit->vertex(3)]
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<< std::endl;
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output << "3 "
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<< index_of_vertex[cit->vertex(0)] << " "
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<< index_of_vertex[cit->vertex(1)] << " "
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<< index_of_vertex[cit->vertex(3)]
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<< std::endl;
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number_of_triangles += 4;
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}
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}
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os << "OFF \n"
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<< n << " "
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<< number_of_triangles << " 0\n"
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<< output.str();
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return os;
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}
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} //namespace CGAL
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#endif // CGAL_TRIANGULATION_OFF_OSTREAM_3_H
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