In article <41f1be29$1@news.povray.org>,
 Alain <ele### [at] netscapenet> wrote:

> You can probably get by without any fade, unless your glass is very thick. 
> Plate glass is slightly 
> greenish, not pure white. Normal glass is not perfectly transparent:
>   color rgbft<0.95, 0.99, 0.94, 0.7, 0.23> can give you a good glass pane.

If you see the glass at a shallow angle or see a thin edge of it, the 
fading will be important because of the contribution of "trapped" rays. 
It is not very computationally expensive, so I usually use fading with a 
perfectly transparent surface pigment. (Unless the surface is dirty, 
that is.)

-- 
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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