Am 27.02.2011 03:08, schrieb gregjohn:
> Hi. I was trying to find the most efficient way to code a mesh for a perfect
> hemisphere.  I could probably do it if I were to break out a while loop with a
> couple thousand entries in the spline based on trig functions.  But it would
> really help to know the simplest way to define one.  So far I haven't hit on it
> with quadratic spline, supposed I will next try cubic.
>
> TIA for any help.

Forget it - you can't get a perfect arc section from cubic (or 
lower-order) splines. As for the other fancy splines in POV-Ray, they're 
actually just cubic splines in disguise.

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