90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
// Copyright (c) 2017 GeometryFactory
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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: https://github.com/CGAL/cgal/blob/v5.1/Polyhedron_IO/include/CGAL/IO/STL_writer.h $
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// $Id: STL_writer.h 52164b1 2019-10-19T15:34:59+02:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Sebastien Loriot
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#ifndef CGAL_IO_STL_WRITER_H
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#define CGAL_IO_STL_WRITER_H
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#include <CGAL/Kernel_traits.h>
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#include <CGAL/boost/graph/properties.h>
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#include <boost/cstdint.hpp>
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#include <boost/graph/graph_traits.hpp>
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namespace CGAL{
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template <class TriangleMesh>
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std::ostream&
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write_STL(const TriangleMesh& tm, std::ostream& out)
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{
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typedef typename boost::graph_traits<TriangleMesh>::face_descriptor face_descriptor;
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typedef typename boost::graph_traits<TriangleMesh>::halfedge_descriptor halfedge_descriptor;
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typedef typename boost::property_map<TriangleMesh, boost::vertex_point_t>::const_type Vpm;
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typedef typename boost::property_traits<Vpm>::reference Point_3_ref;
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typedef typename boost::property_traits<Vpm>::value_type Point_3;
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typedef typename Kernel_traits<Point_3>::Kernel::Vector_3 Vector_3;
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Vpm vpm = get(boost::vertex_point, tm);
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if (get_mode(out) == IO::BINARY)
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{
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out << "FileType: Binary ";
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const boost::uint32_t N32 = static_cast<boost::uint32_t>(faces(tm).size());
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out.write(reinterpret_cast<const char *>(&N32), sizeof(N32));
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for(face_descriptor f : faces(tm))
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{
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halfedge_descriptor h = halfedge(f, tm);
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Point_3_ref p = get(vpm, target(h, tm));
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Point_3_ref q = get(vpm, target(next(h, tm), tm));
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Point_3_ref r = get(vpm, source(h, tm));
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Vector_3 n = collinear(p,q,r) ? Vector_3(1,0,0):
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unit_normal(p,q,r);
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const float coords[12]={
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static_cast<float>(n.x()), static_cast<float>(n.y()), static_cast<float>(n.z()),
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static_cast<float>(p.x()), static_cast<float>(p.y()), static_cast<float>(p.z()),
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static_cast<float>(q.x()), static_cast<float>(q.y()), static_cast<float>(q.z()),
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static_cast<float>(r.x()), static_cast<float>(r.y()), static_cast<float>(r.z()) };
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for (int i=0; i<12; ++i)
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out.write(reinterpret_cast<const char *>(&coords[i]), sizeof(coords[i]));
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out << " ";
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}
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}
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else
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{
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out << "solid\n";
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for(face_descriptor f : faces(tm))
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{
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halfedge_descriptor h = halfedge(f, tm);
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Point_3_ref p = get(vpm, target(h, tm));
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Point_3_ref q = get(vpm, target(next(h, tm), tm));
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Point_3_ref r = get(vpm, source(h, tm));
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Vector_3 n = collinear(p,q,r) ? Vector_3(1,0,0):
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unit_normal(p,q,r);
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out << "facet normal " << n << "\nouter loop\n";
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out << "vertex " << p << "\n";
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out << "vertex " << q << "\n";
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out << "vertex " << r << "\n";
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out << "endloop\nendfacet\n";
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}
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out << "endsolid\n";
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}
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return out;
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}
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} // end of namespace CGAL
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#endif // CGAL_IO_STL_WRITER_H
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