> The atmosphere is an additive combination of a blue scattering media and
> a blueish absorption media. The goal was to produce a blue-ing of the
> shadow elements in the scene and a reddening of the light elements as a
> function of distance. Ultimately the red and blue would merge in a
> neutral gray.

Interesting approach. How long does it actually take? I mean,
you've got stacked-planes as clouds (I guess), so using just
media wouldn't be a clever idea (again, just another educated
guess), but probably a plane as container?
Like to elaborate a bit more on your code?

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html

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