In article <3CA3AA9A.D891977D@scifi-fantasy.com>,
 "Timothy R. Cook" <tim### [at] scifi-fantasycom> wrote:

> Christopher James Huff wrote:
> > This is just another case of the coincident surface problem...POV
> > doesn't know which side of the surface the light is on, so it
> > unpredictably gets shadowed by it depending on how the precision errors
> > work out.
> 
> Why not assume it's on both sides?  Or neither...

Because then you would never get any shadows. ;-)
POV doesn't know the light is "on" the surface, so it can't just avoid 
that surface. If you made the surface shadowless, the problem would go 
away, but that has other obvious problems.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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