Rune wrote:

> 
> Hmm, I found the solution. Change the value of epsilon1 from 0.001 to
> 1.0. I don't know why, but it fixes the distortion and makes the
> distribution completely even. :)
> 
> As I assumed, it was something with how the w value was calculated.
> Apparently, if 1-2*u*v is smaller than 1.0, then no division should
> happen at all (or a division by 1). I found out by coincidence more or
> less, so don't ask me why...

NOO! What you get is no longer a bezier patch! You lose the C-1 continuity 
at the borders! You can clearly see this when you set the tanget vectors to 
0.7 in your example. 

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