Am 06.08.2016 um 21:35 schrieb Bald Eagle:

> I'm trying to calculate a rho or an r value that smoothly varies with u.
> As you can see below, I figured that defining a spline based on the polynomial
> evaluations was a logical way to do this, but the parser complained when I tried
> to use RhoSpline(u) in my functions, and still complains when I try to use a
> user-defined function that returns a spline value.
> "expected 'operand', but spline identifier found instead"

There are a few things that you can do in POV-Ray's regular SDL, but
which don't work in functions.

I'm a bit surprised about this myself, but using splines in place of
functions seems to be one of those things.

You'll therefore have to find a different approach to implement your
spherical harmonics -- pre-computing sample points of the polynomials
and approximating the whole thing with splines won't work.

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