Ken wrote:
> 
> david sharp wrote:
> >
[ ... ]
> > Now, my question is why does POV-Ray do that? What is wrong with
> > one normal pointing 'up' while two point 'down' (or vice versa)?
> 
>   In effect you are twisting it into a fourth demension when you have
>  two normals pointing in the opposite direction of each other on one
>  object.
> 

fourth dimension?
a ball doesn't have to twist into a fourth dimension to have
normals pointing in *every* direction.  

Since Nathan Kopp posted that at least that one triangle was OK with
POV-Ray 3.1a, I find this still mysterious.

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