A quick test on generating clouds based on fbms. I used a very small 3D grid to evaluate the fbm, since at that time my skills in fast-rendering where not that good. I just used a pure 3D fbm with thresholding to create a volumetric density function. The colors are choosen independtly from the density, based in three aditional fbms. I made this experiment for a contest in www.codepixel.com about using perlin noises. That's why the camera movement is also a fbm (three fbms actually, one per coordinate).
You can get the realtime executable here.
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