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/*
* OpenSCAD (www.openscad.org)
* Copyright (C) 2009-2011 Clifford Wolf <clifford@clifford.at> and
* Marius Kintel <marius@kintel.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* As a special exception, you have permission to link this program
* with the CGAL library and distribute executables, as long as you
* follow the requirements of the GNU GPL in regard to all of the
* software in the executable aside from CGAL.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "export.h"
#include "printutils.h"
#include "polyset.h"
#include "dxfdata.h"
#ifdef ENABLE_CGAL
#include "CGAL_Nef_polyhedron.h"
#include "cgal.h"
/*!
Saves the current 3D CGAL Nef polyhedron as STL to the given file.
The file must be open.
*/
void export_stl(CGAL_Nef_polyhedron *root_N, std::ostream &output)
{
CGAL::Failure_behaviour old_behaviour = CGAL::set_error_behaviour(CGAL::THROW_EXCEPTION);
try {
CGAL_Polyhedron P;
//root_N->p3->convert_to_Polyhedron(P);
bool err = nefworkaround::convert_to_Polyhedron<CGAL_Kernel3>( *(root_N->p3), P );
if (err) {
PRINT("ERROR: CGAL NefPolyhedron->Polyhedron conversion failed");
return;
}
typedef CGAL_Polyhedron::Vertex Vertex;
typedef CGAL_Polyhedron::Vertex_const_iterator VCI;
typedef CGAL_Polyhedron::Facet_const_iterator FCI;
typedef CGAL_Polyhedron::Halfedge_around_facet_const_circulator HFCC;
setlocale(LC_NUMERIC, "C"); // Ensure radix is . (not ,) in output
output << "solid OpenSCAD_Model\n";
for (FCI fi = P.facets_begin(); fi != P.facets_end(); ++fi) {
HFCC hc = fi->facet_begin();
HFCC hc_end = hc;
Vertex v1, v2, v3;
v1 = *VCI((hc++)->vertex());
v3 = *VCI((hc++)->vertex());
do {
v2 = v3;
v3 = *VCI((hc++)->vertex());
double x1 = CGAL::to_double(v1.point().x());
double y1 = CGAL::to_double(v1.point().y());
double z1 = CGAL::to_double(v1.point().z());
double x2 = CGAL::to_double(v2.point().x());
double y2 = CGAL::to_double(v2.point().y());
double z2 = CGAL::to_double(v2.point().z());
double x3 = CGAL::to_double(v3.point().x());
double y3 = CGAL::to_double(v3.point().y());
double z3 = CGAL::to_double(v3.point().z());
std::stringstream stream;
stream << x1 << " " << y1 << " " << z1;
std::string vs1 = stream.str();
stream.str("");
stream << x2 << " " << y2 << " " << z2;
std::string vs2 = stream.str();
stream.str("");
stream << x3 << " " << y3 << " " << z3;
std::string vs3 = stream.str();
if (vs1 != vs2 && vs1 != vs3 && vs2 != vs3) {
// The above condition ensures that there are 3 distinct vertices, but
// they may be collinear. If they are, the unit normal is meaningless
// so the default value of "1 0 0" can be used. If the vertices are not
// collinear then the unit normal must be calculated from the
// components.
if (!CGAL::collinear(v1.point(),v2.point(),v3.point())) {
CGAL_Polyhedron::Traits::Vector_3 normal = CGAL::normal(v1.point(),v2.point(),v3.point());
output << " facet normal "
<< CGAL::sign(normal.x()) * sqrt(CGAL::to_double(normal.x()*normal.x()/normal.squared_length()))
<< " "
<< CGAL::sign(normal.y()) * sqrt(CGAL::to_double(normal.y()*normal.y()/normal.squared_length()))
<< " "
<< CGAL::sign(normal.z()) * sqrt(CGAL::to_double(normal.z()*normal.z()/normal.squared_length()))
<< "\n";
}
else output << " facet normal 1 0 0\n";
output << " outer loop\n";
output << " vertex " << vs1 << "\n";
output << " vertex " << vs2 << "\n";
output << " vertex " << vs3 << "\n";
output << " endloop\n";
output << " endfacet\n";
}
} while (hc != hc_end);
}
output << "endsolid OpenSCAD_Model\n";
setlocale(LC_NUMERIC, ""); // Set default locale
}
catch (const CGAL::Assertion_exception &e) {
PRINTB("CGAL error in CGAL_Nef_polyhedron3::convert_to_Polyhedron(): %s", e.what());
}
catch (...) {
PRINT("CGAL unknown error in CGAL_Nef_polyhedron3::convert_to_Polyhedron()");
}
CGAL::set_error_behaviour(old_behaviour);
}
void export_off(CGAL_Nef_polyhedron *root_N, std::ostream &output)
{
CGAL::Failure_behaviour old_behaviour = CGAL::set_error_behaviour(CGAL::THROW_EXCEPTION);
try {
CGAL_Polyhedron P;
root_N->p3->convert_to_Polyhedron(P);
output << P;
}
catch (const CGAL::Assertion_exception &e) {
PRINTB("CGAL error in CGAL_Nef_polyhedron3::convert_to_Polyhedron(): %s", e.what());
}
CGAL::set_error_behaviour(old_behaviour);
}
/*!
Saves the current 2D CGAL Nef polyhedron as DXF to the given absolute filename.
*/
void export_dxf(CGAL_Nef_polyhedron *root_N, std::ostream &output)
{
setlocale(LC_NUMERIC, "C"); // Ensure radix is . (not ,) in output
// Some importers (e.g. Inkscape) needs a BLOCKS section to be present
output << " 0\n"
<< "SECTION\n"
<< " 2\n"
<< "BLOCKS\n"
<< " 0\n"
<< "ENDSEC\n"
<< " 0\n"
<< "SECTION\n"
<< " 2\n"
<< "ENTITIES\n";
DxfData *dd =root_N->convertToDxfData();
for (size_t i=0; i<dd->paths.size(); i++)
{
for (size_t j=1; j<dd->paths[i].indices.size(); j++) {
const Vector2d &p1 = dd->points[dd->paths[i].indices[j-1]];
const Vector2d &p2 = dd->points[dd->paths[i].indices[j]];
double x1 = p1[0];
double y1 = p1[1];
double x2 = p2[0];
double y2 = p2[1];
output << " 0\n"
<< "LINE\n";
// Some importers (e.g. Inkscape) needs a layer to be specified
output << " 8\n"
<< "0\n"
<< " 10\n"
<< x1 << "\n"
<< " 11\n"
<< x2 << "\n"
<< " 20\n"
<< y1 << "\n"
<< " 21\n"
<< y2 << "\n";
}
}
output << " 0\n"
<< "ENDSEC\n";
// Some importers (e.g. Inkscape) needs an OBJECTS section with a DICTIONARY entry
output << " 0\n"
<< "SECTION\n"
<< " 2\n"
<< "OBJECTS\n"
<< " 0\n"
<< "DICTIONARY\n"
<< " 0\n"
<< "ENDSEC\n";
output << " 0\n"
<<"EOF\n";
delete dd;
setlocale(LC_NUMERIC, ""); // Set default locale
}
#endif // ENABLE_CGAL
#ifdef DEBUG
#include <boost/foreach.hpp>
void export_stl(const PolySet &ps, std::ostream &output)
{
output << "solid OpenSCAD_PolySet\n";
BOOST_FOREACH(const PolySet::Polygon &p, ps.polygons) {
output << "facet\n";
output << "outer loop\n";
BOOST_FOREACH(const Vector3d &v, p) {
output << "vertex " << v[0] << " " << v[1] << " " << v[2] << "\n";
}
output << "endloop\n";
output << "endfacet\n";
}
output << "endsolid OpenSCAD_PolySet\n";
}
#endif
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