CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Hello,

The problem comes from the fact that notched is not closed,
thus it is interpreted as a skin.

Sebastien.

#include <CGAL/Simple_cartesian.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.h>
#include <iostream>
#include <fstream>

typedef CGAL::Simple_cartesian<double> K;
typedef CGAL::Polyhedron_3<K> Polyhedron;

int main(int,char** argv)
{
  std::ifstream in(argv[1]);
  Polyhedron p;
  in >> p;

  if (p.is_closed()) std::cout << "closed" << std::endl;

}



Wayne C. Gramlich wrote:
> Greetings:
>
> I have been using the demo/nef_3_homogeneous program quite extensively
> in my code and it has been *extremely* robust.
>
> Recently I have come up with a relatively simple case where it fails
> for me.  The two attached files -- "cube.off" and "notched.off"
> trigger tha failure as follows:
>
>   nef_3_homogeneous loadoff notched.off loadoff cube.off union vis
>
> and the result looks correct.  However, when I change the operation
> from "union" to either "inters" or "diff", the result behaves as if
> "notched.off" is just a skin, rather than a filled volume.  I have
> used the excellent "meshlab" program to verify that all the triangle
> normals are pointed in the right direction for "notched.off".
>
> I am running CGAL 3.8 on Ubuntu 10.4 with gcc 4.4.3 using the 32-bit
> x86 hardware.
>
> Does anybody have insight into what the issue might be?
>
> Thank you,
>
> -Wayne