Funny, I did something similar a while ago, when I was trying to mimic 
Terragen's rendering of height fields. Although obviously, our methods 
differ. I was calling mine cubic interpolation back then but I'm not so 
sure now... I'll have to re-check the source file to find out exactly 
what it is doing ;-)

Anyway, here are the results I got. I'm not uploading the source because 
it is not really readable as is, but if someone is interested I can 
clean it up...

Regards

-- 
Vincent

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