[ODE] TriMesh - do we need to sort triangles?

Jon Watte (ODE) hplus-ode at mindcontrol.org
Sun Apr 22 19:39:56 MST 2007

Yes, you need to have consistent winding on the trimeshes (they are 
The only way to get rid of that behavior is to add each triangle twice, 
with both windings (at a bit of a speed hit).


          / h+

Jürgen Ladstätter wrote:
> Hi there,
> ist again me with my small trimesh problems. Trimesh collision 
> detection works quite well for our maps, the funny thing is, that if 
> the triangles vertexpoints are not clockwise sorted, the bodies fall 
> through the floor.
> So my question to you is: does ODE do the normal vector calculation 
> for physics base on the vertexpoint order? And if so, do you know any 
> function to skip that?
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