CGAL users discussion list

[Ariel Baez <>]

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)

Again going from memory.

Hope this helps.
AB

On Tue, Dec 8, 2009 at 8:00 AM, Laurent Rineau (GeometryFactory) <> wrote:

On Tuesday 08 December 2009 12:08:14 wrote:
> Hello everybody.
> I find a aswer to my problem in terrain draw. Posting the solution for
>  others use.

If you would have told us you wanted to compute and draw a terrain, we would
have told you to use 2D triangulations.

There is even an example about the compuation of terrains, in CGAL. See:
http://www.cgal.org/Manual/last/doc_html/cgal_manual/Triangulation_2/Chapter_main.html#Subsection_33.5.2

It uses the traits class CGAL::Triangulation_euclidean_traits_xy_3<K> that
applies 2D predicates on 3D points.

--
Laurent Rineau, PhD

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

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