I experimented breifly with the scene and found that the thicker BoxB is, the
more "spotted" with dark spots it gets, so by the time it gets a deep as you
have it, it has so many darker spots that it appears to be black with white
spots.

You can increase the intervals and samples of the media, but the cost in
rendering time is enormous. I don't recommend it, but it does increase the
white levels of the media.

Josh

Tom Melly wrote:

> With the camera and light above the following boxes, BoxA shows up as white
> media, which is what I expected, but BoxB shows up as black - why is this?
> After all, if you are looking down at a cloud from an airplane, beyond a
> certain point the actual physical thickness of the cloud is not
> particularily significant (is it?).
>
> #declare BoxA =  // nice 'n' white
> box
> {
>   <-10000, -1, -10000>
>   < 10000,  0,  10000>
>   pigment{rgbf<1,1,1,1>}
>   hollow on
>   interior{media{Plain_White_Scattering_Media}}
> }
>
> #declare BoxB = // completely black
> box
> {
>   <-10000, -10000, -10000>
>   < 10000,  0,  10000>
>   pigment{rgbf<1,1,1,1>}
>   hollow on
>   interior{media{Plain_White_Scattering_Media}}
> }

--
Josh English
eng### [at] spiritonecom
"May your hopes, dreams, and plans not be destroyed by a few zeros."

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