Nieminen Mika wrote:

>   Note that the coincident surfaces problem (this is a so used term it should
> be abbreviated CSP :) ) can also occur with objects not in the same CSG.
>   Also note that a very special case of CSP occurs when a light source is
> exactly on a surface: Povray can't calculate accurately if the light source
> is inside or outside the surface, so black spots will appear in every
> place which is illuminated by this light.
>
> --
>                                                            - Warp. -

  It can also appear if you have two flat surfaces abutting each other
but otherwise having nothing in common. I have seen it recently when
another pov user asked why one of the example scene files included
with pov, had black artifacts. It was a box resting on a plane and the
coincident surface occurred between them.

Ken

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