Where have I seen a variable or POV-Ray function that gives the height
of a height field at a given set of  x, z  coordinates?

If this were a new feature of POV 3.1, it would be the last straw, and
I'd have to download it.  But I didn't see it in any list of new
features, and it's not on my 3.02 documentation.  Did I hear about this
in one of the specialty versions of POV, or is it my imagination?

_______________
Greg M. Johnson

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