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// Convert from OFF format to StereoLithography StL format.
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Verbose_ostream.h>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <fstream>
using namespace std;
bool verbose = false;
bool binary = false;
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;
typedef CGAL::Polyhedron_3<Kernel> Polyhedron;
typedef Polyhedron::Vertex_iterator Vertex_iterator;
typedef Polyhedron::Facet_iterator Facet_iterator;
typedef Polyhedron::Halfedge_handle Halfedge_handle;
// main function with standard unix commandline arguments
// ------------------------------------------------------
int main( int argc, char **argv)
{
int n = 0; // number of filenames
char *filename[2];
bool help = false;
for (int i = 1; i < argc; i++) { // check commandline options
if ( strcmp( "-v", argv[i]) == 0)
verbose = true;
else if ( strcmp( "-b", argv[i]) == 0)
binary = true;
else if ( (strcmp( "-h", argv[i]) == 0) ||
(strcmp( "-help", argv[i]) == 0))
help = true;
else if ( n < 2 ) {
filename[ n++] = argv[i];
} else {
++n;
break;
}
}
if ((n > 2) || help) {
if ( ! help)
cerr << "Error: in parameter list" << endl;
cerr << "Usage: " << argv[0] << " [<options>] [<infile> [<outfile>]]"
<< endl;
cerr << " convert a CGAL object (OFF) to StereoLithography StL "
"format." << endl;
cerr << " -v verbose." << endl;
cerr << " -b binary." << endl;
exit( ! help);
}
CGAL::Verbose_ostream vout( verbose);
vout << argv[0] << ": verbosity on." << endl;
const char* iname = "cin";
istream* p_in = &cin;
ifstream in;
if ( n > 0) {
in.open( filename[0]);
p_in = ∈
iname = filename[0];
}
if ( !*p_in) {
cerr << argv[0] << ": error: cannot open file '"<< iname
<< "' for reading." <<endl;
exit( 1);
}
vout << "Reading polyhedron ..." << endl;
Polyhedron P;
(*p_in) >> P;
vout << " .... done." << endl;
if ( !*p_in) {
cerr << argv[0] << " read error: while reading file '"<< iname << "'."
<< endl;
exit( 1);
}
const char* oname = "cout";
ostream* p_out = &cout;
ofstream out;
if ( n > 1) {
out.open( filename[1]);
p_out = &out;
oname = filename[1];
}
if ( !*p_out) {
cerr << argv[0] << ": error: cannot open file '"<< oname
<< "' for writing." <<endl;
exit( 1);
}
vout << "Write file ...." << endl;
*p_out << "solid " << oname << endl;
// find "bottom/left/front" corner to translate into positive octant
Vertex_iterator vi = P.vertices_begin();
Point p = vi->point();
double minx = p.x();
double miny = p.y();
double minz = p.z();
for ( ; vi != P.vertices_end(); ++vi) {
p = vi->point();
if ( p.x() < minx)
minx = p.x();
if ( p.y() < miny)
miny = p.y();
if ( p.z() < minz)
minz = p.z();
}
// translate into positive octant
Vector trans( -minx, -miny, -minz);
for ( Vertex_iterator i = P.vertices_begin(); i != P.vertices_end(); ++i) {
i->point() = i->point() + trans;
}
// write triangles
for ( Facet_iterator i = P.facets_begin(); i != P.facets_end(); ++i) {
Halfedge_handle h = i->halfedge();
if ( h->next()->next()->next() != h) {
cerr << argv[0] << " format error: polyhedron in file '"<<
iname << "' is not triangulated." << endl;
exit( 1);
}
Point p = h->vertex()->point();
Point q = h->next()->vertex()->point();
Point r = h->next()->next()->vertex()->point();
// compute normal
Vector n = CGAL::cross_product( q-p, r-p);
Vector norm = n / std::sqrt( n * n);
*p_out << " facet normal " << norm << endl;
*p_out << " outer loop " << endl;
*p_out << " vertex " << p << endl;
*p_out << " vertex " << q << endl;
*p_out << " vertex " << r << endl;
*p_out << " endloop " << endl;
*p_out << " endfacet " << endl;
}
*p_out << "endsolid " << oname << endl;
vout << " .... done." << endl;
if ( !*p_in) {
cerr << argv[0] << " read error: while reading file '"<< iname << "'."
<< endl;
exit( 1);
}
if ( !*p_out) {
cerr << argv[0] <<" write error: while writing file '"<< oname << "'."
<< endl;
exit( 1);
}
return 0;
}
// EOF //
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