"Tim Attwood"  wrote in message <48081535$1@news.povray.org>:
> Sure, but I meant a POV spline.

Well, a POV spline is one of linear_spline, quadratic_spline, cubic_spline
or natural_spline, which are all piecewise polynomials with degree up to
three. Computing its derivative is theoretically trivial.

In practice, I expect that the SDL does not provide enough introspection to
do it on any spline. That would be nice if the function was readily
available. And anyway, if the spline parameters are known in the source,
then it can be done without POV's help.

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