I have a glass with some liquid in it. The glass is a Bezier spline
lathe, and the liquid is a slightly smaller lathe intersected with a
horizontal plane. Now I know I could put a meniscus on the surface with
a torus and some more CSG, but since the liquid is a lathe and I don't
know its diameter at the height I want the surface, I don't know where
to put the torus. So, is there some way to get PoV to evaluate the
Bezier cubic at the desired height and use this to place the torus; even
better, is there an easier way to do the meniscus?

Thanks in advance,
Daniel

-- 
The most important thing about a programming language is the name. A
language will not succeed without a name. I have recently invented a
very good name and I am looking for a suitable language.  -- Knuth
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