How did you do the height field in the background?
A couple guesses:
a modified image_map of a rendered image of the height field?
A slope-dependant texture which is transparent on parts with a low 
slope, but black on places with higher slope? Or the other way 
around?(depends on which direction you choose for the slope)
Or maybe a plain transparent texture and a low max_trace_level, so it 
stops early and makes black areas...?

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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