"JWV" <jwv|at|planet.nl> wrote:

> Does anyone know what is happening here?
> 
Yes. You are experiencing the long-known parametric object bug. 
I have a patch on my homepage (which was not included into POV-3.6): 
http://www.cip.physik.uni-muenchen.de/~wwieser/render/povray/patches/
(Its part of the "combined bugfix patch".)

With the patch applied, the image looks like the one posted in 
p.b.images "Re: question about parametric object". 

Wolfgang

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