You might want to check out 3DEM70 by Richard Horne at
http://www.monumental.com/rshorne/3dem.html

Not only does it generate Targa heightfields, it'll also generate
VRML ElevationGrids, so while you're waiting for a render you
can fly around in the VRML model to find that perfect camera
position.
--
Bob Crispen
cri### [at] hiwaaynet
'T is with our judgments as our watches,--none 
Go just alike, yet each believes his own.
-- Alexander Pope: _Essay on Criticism_

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