CGAL users discussion list

["Fernando Cacciola" <>]

Hi Sinan,

The polygon in data/example.poly has the wrong orientation.
I didn't notice before because the demo program corrects the orientation of 
polygons on load, but I forgotten it did that.

If you add the following to your example program, right after the example is 
loaded:

CGAL::Orientation o = CGAL::orientation_2(all_pts, all_pts+(int)vertexCount);
if ( o != CGAL::COUNTERCLOCKWISE )
  std::reverse(all_pts,all_pts+(int)vertexCount);

it will work.

Best

Fernando Cacciola
GeometryFactory