John VanSickle wrote:
> 
> You're making an apples-to-oranges comparison.  A method that has
> several thousand primities will of course be more memory intensive
> and run slower than a method that has one primitive.  The height_field
> primitive could be modified to allow this interpolation method as an
> option.
> 

I did not want to make any judging comparison, just tried to figure out how
things change when using larger heightfields.  

Coding this technique into povray is an interesting idea, it surely makes things
more effective, but NTL you will have to decide whether you calculate things in
advance (leading to longer parsing time and more memory use), or during trace
(slowing it down).

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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