>> Did you consider using the "bicubic_patch" object in POV?  Maybe you 
>> could find (or write) some code to convert each heightfield cell into a 
>> bicubic patch, this would then still look very smooth even if you got 
>> very close.
>>
> A program like GeoControl does something like that I think as it has the 
> possibility to export the heightfield as an .obj file. The other side of 
> the medal however, is that this file is HUGE, a few hundreds of MB for a 
> high resolution heightfield.

Yeh I guess even if you reduce the resolution by a factor of 2 or 4, it will 
be hard to beat the 2 bytes per point you need for the raw heightfield.

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