In article <3f713be4@news.povray.org>,
 Lutz-Peter Hooge <lpv### [at] gmxde> wrote:

> > Chris has the right idea... what I'm looking for is a material that blurs
> > the image more if the ray has to pass through a lot of the material rather
> > than just a tiny bit.
> 
> What real-life material does this?
> IMHO blurring normally only occurs on surfaces.

Very wrong. Every transparent material does this, but with very clear 
materials the interior scattering is insignificant. Examples of where it 
is significant: smoke, fog, clouds, milk, translucent materials such as 
milky glass, marble, flesh. Glass with lots of microscopic bubbles in 
it. In most of these, the light is scattered almost evenly in all 
directions, so you don't perceive it as a blur, which would require 
scattering at a relatively small angle to the original direction. You 
could construct such a material easily the same way you would simulate 
it in POV, by stacking thin layers of a blurring material. (With 
air-gaps or alternating layers of different ior.)

-- 
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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