When my final cloth program is ready, you could try it for generating smooth
surfaces.
This should work: define a cloth using the terraced rectangular surface and
let it contract itself with the edges 'locked' to something or with immobile
edges. With gravity = <0, 0, 0> it should should become smooth.

The result won't be a heightfield, but a mesh2 object.

Apache
http://geitenkaas.dns2go.com/experiments/

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