> A rectangle is swept along a parametrisised 3d spline to construct the solid
> object.. is this possible?
Somewhere in these newsgroups (I think in povray.binary.scene-files, but 
  don't take that for granted) is a script which will create a mesh fake 
of a sphere sweep (shame on me, I've also forgotten the name of the 
author). It lets you use a spline-based base-shape. I think you could 
modify it pretty easy to sweep along a parametric function and to use a 
parametric function as base-shape (if you want the latter at all).

HTH,
Florian

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