>   Actually it matters when you use uv-mapping.

Thats interesting, I never thought about that...

This leads to the question: Does splitting along the shorter diagonal 
also give better results concerning u/v mapping? I drew a few irregular 
quads and by taking a look at how they would be u/v mapped I got the 
impression that splitting along the longer diagonal might be slightly 
"better"...

Is there anything that can be done about it (e.g. are OpenGL quads meant 
to somehow overcome this kind of problem)?

-Sascha

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