In article <3a008179@news.povray.org>, "Jetlag" <bga### [at] microsoftcom> 
wrote:

> What I don't understand is why it's so common, it should be obvious; all 
> you have to do is look up when there's some clouds passing by.

Umm, if you are talking about what I think you are(the visible "beams" 
of light caused by partial clouds and atmospheric scattering), that is a 
completely different illusion, caused by perspective. The beams appear 
to come from a point because they appear smaller and closer together the 
further away they are...the same effect that shows in railroad tracks, 
checkered planes, etc. If the light was parallel, you would still get 
that effect. I don't know how much a difference the divergence makes, 
but I doubt it would be obvious without side-by-side comparisons of 
images. It might be an interesting POV project though...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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