Interesting. Yes, has been done :-)
A few suggestions:
- Move the camera away from the vertical to increase the sense of depth
- light the height_field from a lower angle (is there a light, btw?); not 
sure, but you may have to set the finish{ambient} to 0 for the map.
- decrease the vertical scale of the height_field

(note: Do not use html format in newsgroup mails.)

Thomas

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