In article <3e1c7b0b@news.povray.org>, "Tim Nikias" <tim### [at] gmxde> 
wrote:

> Most of the time, us POVers leave a little gap between two transparent
> surfaces in order to avoid coincident surfaces. But when refracting rays,
> the effect taking place is different as opposed to two surfaces touching
> each other.

Overlap them a bit. POV does things so that refraction is handled 
correctly in this case. The gap method simulates an air gap.

Designing the textures properly also helps. I usually use perfectly 
transparent textures and use interior attenuation or media to provide 
any coloration.

-- 
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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