> One option would be to make the curve out a sphere-cylinder-sphere chain, with
> several hundred spheres.  This is pretty fast, but is there a tidy way to
> automate the generation of that in PoV script?  When I was younger I'd just
> write a C++ script to generate the PoV script but I'm hoping there's a tidy way
> to do this in PoVRay itself.  Of course, a problem with this is I'd have to
> appropriately crop the spheres if I wanted the effect to be seamless (and the
> curves partially transparent).

Couldn't you just "merge" the spheres and cylinders, then no cropping 
should be necessary. A simple while or for loop in POV could create the 
chain of spheres and cylinders, so long as your spheres are spaced close 
enough it will look like a smooth curve. I did this a long time ago to 
model speaker cable (two solid cores inside a semi-transparent case) and 
it worked nicely.

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