Also, heightfield itself goes hand in hand with image mapping once rotated 
90*x, so those are mutually compatible as-is.

What might have been a good idea, and could still be, would be to use a 
keyword in height_field and image_map to allow automatically centering 
them... and anything else that places a corner at <0,0,0>. Except then I'd 
think rescaling to double the initial 1 unit size might be something to 
consider, too, so that the area covered would be like a unit-sized sphere, 
cylinder, cone, etc.

Bob H.

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