In article <41f17f26$1@news.povray.org>,
 Maurice <cel### [at] nospamhotmailcom> wrote:

> I forgot to mention that I'm particularly struggeling with the 
> fade_power, fade_distance and fade_color values. The manual is rather 
> cryptic about those. I guess fade_power would have to be 2 in order to 
> be physically correct, but the fade distance of window pane glass I have 
> no idea what it should be. Also the fade_color.

fade_color is the apparent color of the material. For red glass, it 
should be red. A side note: I rarely use pure colors, I'd use tiny 
values of green and blue as well, for more realistic response to very 
bright light.

fade_power controls the function of distance used. Most realistic is a 
fade_power of 1000, which tells POV to use exponential attenuation. 
(Yeah, that's a terrible syntax for this...)

fade_distance controls the density...doubling it will make it reach a 
given proportion of the fade_color color in half the distance.

What I usually do is set fade_power to 1000, pin down the approximate 
color I want, then tweak fade_distance until it's the right density.

-- 
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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