After all this talk of periodic functions in p.g. ... ;)

A patch of grass is a single isosurface. There are multiple
patches only to show lower densities on the left.

Render time was about 8 minutes for 800x600 with +a0.1
using 3.7 RC3 on a rather fast hexacore. Not something you
want to combine with radiosity, I think.

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