Please forgive me if I've totally messed things up here but this is my
first ever attempt at a "follow up" which Nieminen M. had mentioned.
And if it works this might be as good a place as any to place this post.


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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