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Does anyone know how they do this? They're not truly volumetric - you can't fly through them - it's still a texture.

It looks like it's a perlin based solution, but I really can't work out how they get the fantastic lighting! How can I achieve this effect?

To be clear, I'm not talking about the sky (which would be a variation on CIE/Preetham) or sun shafts or any other effect - i'm talking purely about the clouds, which are rendered straight to the skybox texture.

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For realtime fog/cloud rendering you can take a look at this article from GPU Gems 3.

If you are looking for Sky / Atmospheric Rendering, over at vterrain they have a nice collection of articles.

For light/sun scattering I suggest you take a look at the blog of Fabien and again GPU Gems 3

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