"David Fontaine" wrote:
> Make a big solid shape and add the fade_distance and
> fade_power keywords (and hollow if the camera is
> inside it, I think...).

Fog and fading are two entirely different things as you can se if you render
the code
below (requires MegaPov).
(It simulates interior fog by using an inverted object.)
You could say that if fog is like transmit, fade_color is like filter.

#default {finish {ambient 1 diffuse 0}}
box {<-3,0,7>, <3,-2,8> pigment {color <1,1,1>}}
box {<-3,0,7>, <3,+1,8> pigment {color <1,0,0>}}
box {<-3,1,7>, <3,+2,8> pigment {color <0,1,0>}}
difference {
   sphere {5*z-x, 1 inverse}
   sphere {0, 0.00001}
   pigment {color rgbt 1}
}
fog {
   fog_type 1
   distance 1
   color rgb <0.0,0.0,1.0>
}
sphere {
   5*z+x, 1
   pigment {color rgbf 1}
   interior {fade_power 1 fade_distance 0.6 fade_color <0,0,1>}
   hollow
}

Rune
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