Peter Popov wrote:

> Just out of curiosity, isn't the formula in the source code of POV? If
> you can't find it, can you use trace() ? Lastly, why don't you use a
> bezier spline lathe? At least you won't be wondering where its
> tangents are pointing.

Excellent suggestion. The most obvious way to do what I want is a Bezier
spline... if only I happenned to find the syntax somewhere in the docs!

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