> heightfields inevitably look "blocky", so I ask myself whether it is 
> possible to convert the height value matrix of a heightfield by 
> "cross-approximating" each row and column into a discrete 3D function like 
> it is used with isosurfaces...

You can do that, but if you have more than a few data points on each 
row/column your isosurface function is going to become horrendous and very 
slow to render.

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.

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