Bezier patches are also infinitely thin.  It MIGHT be possible to create a
patched version of POV that treats triangle meshes as solid.  The main
problem that currently exists is that POV doesn't know if a point is inside
an object or not.  The simple (but not always effective) solution is to
shoot an arbitrary ray from the point and if it intersects an even number
of triangles, you are outside the object, and if it intersects an odd
number than you are inside.  Maybe I'll try it.  (here I go again talking
about stuff here that should be in the povray.programming newsgroup.)

-Nathan Kopp

Margus Ramst wrote:
> 
> As for converting to a solid object - a mesh of triangles will always remain
> just that. I can think of no way that you coul convert it into a parametric
> surface. Maybe you should try using bezier patches instead?
> 
> Margus

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