Am 29.07.2010 11:03, schrieb tgl:

> Could some understanding person out there please show
> how they would code a sphere_sweep b_spline of a 180
> degree circular arc into POV.
> And...How would the above arc be coded as a sphere_
> sweep natural_spline?

Both b_spline and natural_spline are actually cubic splines at their 
heart (with different approaches of parameterizing the spline via the 
control points). Unfortunately, unless I'm totally mistaken, cubic 
splines are incapable of representing circular arcs, so the best you can 
get is an approximation.

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