4527c96f$1@news.povray.org...
> Fade_power should be 1 to be physicaly correct. A value of 2 is perfect
for a
> light source, double the distance and get 1/4 the lighting, not for fading
> trough some substance. Light absorbtion trough a substance is linearly
> proportional to the thicknessm, double the thickness and the effect
double, it
> don't quadruple.
> Any way, for water, fade_distance is relatively large.
>
I don't agree about fade power in water :
daylight rays have to get twice (down and back up) through water before
reaching your eye so double the depth quadruple the thickness

Marc

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