CGAL users discussion list

["Laurent Rineau (GeometryFactory)" <>]

On Tuesday 08 December 2009 18:27:24 Ariel Baez wrote:
> Going from memory, but when drawing the triangles if you are drawing a
>  bunch of them, OpenGL needs three points for the first triangle, but only
>  needs an additional point for the next triangle, since OpenGL will use
>  point #2 and point #3 of your first triangle for the first two points of
>  the next triangle. This can be turned off, but I dont recall exactly how
>  this is performed (GL_PROPERTY)

If you use:

glBegin(GL_TRIANGLE_STRIP);
  //
glEnd();

then you are drawing a triangle strip (what you described).

If you want to draw triangles:

glBegin(GL_TRIANGLES);
 //
glEnd();

then that is triangles that you are drawing.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/