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I found this a good introduction to the diamond-square midpoint displacement algorithm for 2D terrain heightmap (or cloud texture) generation:

http://www.gameprogrammer.com/fractal.html

I implemented an extension to 3D.  C99 source code attached.

Here it is rendered in slices, thresholded with edge-detection on the histogram-equalized voxel space, perhaps could be useful for generative cave systems or similar worlds:

roughness factor 0.3


roughness factor 0.5


roughness factor 0.7