mirror of https://github.com/CGAL/cgal
70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
// Copyright (c) 2023 GeometryFactory Sarl (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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// You can redistribute it and/or modify it under the terms of the GNU
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// General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: GPL-3.0+
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//
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// Author(s) : Laurent Rineau
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#ifndef CGAL_CDT_3_DEBUG_IO_H
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#define CGAL_CDT_3_DEBUG_IO_H
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#include <ostream>
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#include <CGAL/boost/graph/IO/OFF.h>
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#include <CGAL/Surface_mesh.h>
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#include <CGAL/Polygon_mesh_processing/orient_polygon_soup.h>
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#include <CGAL/Polygon_mesh_processing/repair_polygon_soup.h>
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#include <CGAL/Polygon_mesh_processing/polygon_soup_to_polygon_mesh.h>
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namespace CGAL {
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template <typename Tr, typename Facets>
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auto export_facets_to_surface_mesh(const Tr& tr, Facets&& facets_range) {
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using Point_3 = typename Tr::Geom_traits::Point_3;
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const auto size = std::distance(facets_range.begin(), facets_range.end());
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std::vector<Point_3> points;
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points.reserve(size * 3);
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std::vector<std::array<std::size_t, 3>> facets;
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facets.reserve(size);
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std::size_t i = 0;
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for(const auto& [cell, facet_index] : facets_range) {
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const auto v0 = cell->vertex(Tr::vertex_triple_index(facet_index, 0));
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const auto v1 = cell->vertex(Tr::vertex_triple_index(facet_index, 1));
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const auto v2 = cell->vertex(Tr::vertex_triple_index(facet_index, 2));
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points.push_back(tr.point(v0));
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points.push_back(tr.point(v1));
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points.push_back(tr.point(v2));
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facets.push_back({i, i+1, i+2});
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i += 3;
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}
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CGAL::Polygon_mesh_processing::merge_duplicate_points_in_polygon_soup(points, facets);
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CGAL::Polygon_mesh_processing::orient_polygon_soup(points, facets);
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Surface_mesh<Point_3> mesh;
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CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh(points, facets, mesh);
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return mesh;
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}
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template <typename Tr, typename Facets>
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void write_facets(std::ostream& out, const Tr& tr, Facets&& facets_range) {
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const auto mesh = export_facets_to_surface_mesh(tr, std::forward<Facets>(facets_range));
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CGAL::IO::write_OFF(out, mesh);
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}
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} // end namespace CGAL
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#endif // CGAL_CDT_3_DEBUG_IO_H
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