William Tracy wrote:

> I have attached here an image rendered with 1 for the octaves value for 
> f_ridged_mf(), which gives a very different feel to the sand dunes. 
> Unfortunately, since all the ridges are perfectly level, it only looks 
> right if the camera is significantly above the horizon. :-(

Maybe you can break the regularity a bit using something
cheap like 0.8*f_ridged_mf + 0.2*f_bozo.

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