In article <3f203d32@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

> http://geocities.com/ccolefax/lenseffects.html

What Penners is looking for is actually produced by atmospheric 
scattering, not a lens effect. Unfortunately, the scattering models used 
in POV peak at an angle of 0 to the light, so you get a glow that's 
brightest around the source and just falls off from there. The ice 
crystals that cause this effect scatter light differently, peaking at 22 
degrees. POV just doesn't have a scattering model that describes this 
effect. Maybe the scattering intensity curve could be specified with a 
user-defined function, this would give a great deal more flexibility.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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