In article <3f6f56f8@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

>   The blurred refraction trick blurs the background more if it's farther
> away than if it's closer. I don't understand what else you are after.

I think he's trying to simulate scattering throught a material. The 
probability of a photon getting scattered in a random direction 
increases with the length of its path through the material, and can 
occur at any point inside the material. Blur textures only simulate 
surface scattering, like ground glass.

This type of scattering would be quite expensive to compute, since it 
would involve tracing many rays for each transmitted ray. You could 
simulate it by using several surfaces with the blurry texture in the 
interior of the object, but POV has no built-in facility for doing this.

-- 
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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