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.