Am 21.03.2013 21:41, schrieb Timwi:


> patches in which four points (along one edge) are all the same point.

I'm not sure whether this actually qualifies as a bug, or just a 
limitation. After all, that one point does constitute a singularity.

At any rate, this issue has been around for ages now - I recall having 
stumbled across this problem when toying around with POV-Ray's bezier 
patches back in the mid-90's.

Could you please file an issue report at http://bugs.povray.org?

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