CGAL users discussion list

[Manuel Caroli <>]

Hi Naresh,

you can use something like the function below.

Warning: I have not tested the function, neither can I give any 
guaratees for it. Also it is not really space efficient as it writes 
each vertex once for each of its incident tetrahedra as well as each 
triangle twice.

best

Manuel

==========================================================
template <class Stream, class Triangulation>
Stream &write_triangulation_to_off(Stream &out, Triangulation &t) {
  typedef typename Triangulation::Point Point;
  int number_of_cells = t.number_of_finite_cells();
  out << "OFF "
      << "\n" << 4*number_of_cells
      << " "  << 4*number_of_cells
      << " "  << 0
      << std::endl;

  for (typename Triangulation::Finite_cells_iterator it = 
t.finite_cells_begin();
       it != t.finite_cells_end(); it++) {
    for (int i=0; i<4; i++) {
      Point p = it->vertex(i)->point();
      out << p.x() << " "
      << p.y() << " "
      << p.z() << std::endl;
    }
  }
  for (int i=0; i<number_of_cells; i++) {
    out << "3 " << i*4 << " " << i*4+1 << " " << i*4+2 << std::endl;
    out << "3 " << i*4 << " " << i*4+1 << " " << i*4+3 << std::endl;
    out << "3 " << i*4 << " " << i*4+2 << " " << i*4+3 << std::endl;
    out << "3 " << i*4+1 << " " << i*4+2 << " " << i*4+3 << std::endl;
  }

  return out;
}
===========================================================

naresh wrote:
> Hi
>
> I donot want geomview because i am using Windows XP and i need to do lot 
> of stuff for CygnWin.. How can i save .OFF format ? because i have Deep 
> Exploration wich support .OFF format
>
>
> ----- Original Message ----- From: "Monique Teillaud" 
> <>
> To: 
> <>
> Sent: Friday, February 13, 2009 2:12 PM
> Subject: Re: [cgal-discuss] Triangulation Question
>
>
> >  wrote:
> >
> > > I looked at Tringulation_3 example but it saves some format as output 
> > > text i
> > > donot know how to view this format in any type of 3D viewers ?
> >
> > Hi,
> >
> > Look at the reference manual of Triangulation_3<>, section I/O 
> > (bottom), you will see how to output 3D triangulations into Geomview.
> > Also, there are demos in demo/Triangulation_3
> >
> > best
> > Monique Teillaud
> > --
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