Fredrik Eriksson schrieb:

>> Being able to render the patches directly without triangulating would 
>> be cool!  I guess you "just" need a ray-patch intersection formula - 
>> does such a thing exist?
> 
> Yes, such a thing exists, but the math is a bit complicated, and 
> performance is likely to be underwhelming.
> 
> http://www.google.com/search?q=nurbs+ray+intersection

The very first entry /looks/ promising though.

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