> An easy-to-use macro of your technique would be useful, if it 
> renders/parses quickly. It is an improvement over linear
> interpolation, that much is evident.
> 

I posted a macro version of my technique under your thread with the same
subject in povray.binaries.scene-files. I wouldn't say it is quick...
But I don't really know if a quicker implementation can be done.

Of course since it is in Megapov now the incentive to optimize is a bit
diminished :-)

However, as I said in my message over at povray.binaries.scene-files, I
believe you could make interesting things by tweaking the computation a
bit. Since the bicubic method needs the slope at each grid point, you
could specify anything, not necessarily deducing it from the data as
I've done.

I also made a new comparison of the bilinear and bicubic methods using
this new scene file and a lower-res height field, see the attachment.

Regards,

-- 
Vincent

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