Eric Dowty wrote:
> 
> There are several possible immediate solutions - I am thinking at the
> moment that I will convert the polygons to planes and use "intersection"
> to make polyhedra.  I use this already for drawing crystals, where the
> face equations (not corners) are the primary data.

You should know that this is a very slow solution in contrast to a
triangle mesh.  An intersection of many planes is one of the lowest things
you can have in povray if you don't use manual bounding.

> 
> It would seem that the polygon option in POV-Ray does not really work
> unless the corners are set up in two dimensions - it is unrealistic in
> general to expect the user to supply 3-D coordinates to the tenth
> decimal (if in fact this would work anyway for general 3D points).   Is
> the planarity test really necessary?  Even if it is, would it not be
> possible to fudge the corners (within limits) to enforce planarity?
> 

If you really want to use a polygon object, why don't you set it up in 2d
and transform it like Ron suggested.  The 'fudging' you suggested would
work exactly the same way.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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