Christopher James Huff wrote:
>In article <3f203d32[at]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/
>

Hi,
 This is exactly what I mean.  Is there somewhere you could point me to
learn more about this scattering phenomenon and/or a scattering model that
defines it...out of curiosity.
Thanks!
Penners

Post a reply to this message

In article <web.3f216b4dce8953885c46d5e30@news.povray.org>,
 "Penners" <pen### [at] hotmailcom> wrote:

>  This is exactly what I mean.  Is there somewhere you could point me to
> learn more about this scattering phenomenon and/or a scattering model that
> defines it...out of curiosity.

A simple Google search shows some possibilities:

http://www.google.com/search?q=scattering+ice+crystal+halo+22

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

Post a reply to this message