> > How do I select which diagonal to use when converting quads to 2
> > triangles?
>
> It should not matter...

It does. A general solution is to connect using the shortest diagonal. If
you don't, you can get very stretched triangles, which don't look too good
for texture/phong-interpolation. This might not be that big an issue in most
cases, but in extreme cases, you want to have a fairly even triangle instead
of long and sharp ones.

Regards,
Tim
-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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