> This 'y-movement' that you are seeing-- actually not real movement at all-- is
> the typical 'look' and behavior of a height_field when a particular kind of
> function is used for it...or even a particular kind of image_map function.

After your explanations and a few suggested experiments this strange fenomena
become to me clear, but  believe, you will agree, that from the user's  point of
view the behaviour of this function is unexpected and leads to some confusion.
I do not mean, that implementation is poor, but only that result are
non-intuitive.

Thanks a lot for consultation, at least now I know how to avoid these pitfalls.
The world is not what it seams ...
--
YB

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