In article <3CA2CAA6.20C1614C@joplin.com>,
 Leroy Whetstone <lrw### [at] joplincom> wrote:

> I found that if a plane intersects a light source some strange things can
> happen. Sometimes little black artifacts sometimes it acts like there no light
> at all.

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.

-- 
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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