Steven Jones wrote:

> I just had a real brainwave!  Normally height fields by definition don't
> allow overhangs.  I realised you could work around this by STACKING height
> fields.  You have a main height field and then a height field on top for the
> underside of any overhangs and then a third hf on top of that for the top of
> the overhangs.

Or you could just use isosurfaces

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