Another little phenomenon that I found out:
When creating a hf from an image with res m*n, the hf has a res of
(m-1)*(n-1), ie. each pixel represents a vertex on the hf (this is mentioned
in "6.5.1.5  Height Field"), this requires the input image I use to need an
"extra" row and column of pixels to join seamlessly.  However, with the
"function image pattern", this is not necessary.

-tgq

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