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Isn's this pretty close to the marching squares/marching cubes algorithm?

No, the marching cubes algorithm has a very specific meaning, because it's patented. It builds a 3D surface from a 3D grid (each grid cell is either 'filled' or 'empty').

IANAL, but I think the Marching Cubes patent has expired now since it's been 20+ years since both filing and issuance: http://www.google.com/patents?vid=4710876

Oh, good riddance. It always seemed like such an obvious patent.

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