I just had to laugh inwardly about all this talk in the newusers group.
It sounds so much like some advanced topic going on, for which there is
the appropriate group.


Ron Parker wrote:
> 
> On Sun, 25 Jul 1999 09:48:00 -0400, Dave Kreskowiak wrote:
> >In my experience, coincident surfaces tend to render a jittered imaged of
> >both textures, not a black spot.
> 
> Black spots (actually transparent spots) are fairly common.  They usually
> happen when you have an intersection involving coincident surfaces.  POV
> will find one or the other surface, then determine that that surface is
> "outside" the other surface and ignore that intersection.  It then goes
> on to find another intersection, but because it always starts looking at
> a distance of EPSILON along the ray from the last intersection, it misses
> the second surface at that point entirely, leaving a transparent spot
> that could show up as black under the right circumstances.

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