> If I'm understanding correctly Vincent's technique was actually doing
> cubic interpolation, rather than just using cubic_wave (which isn't
> equivalent)...
> 

Well I don't know if it was cubic interpolation proper, but looking at
my code it seems that I was attempting to keep a continuous slope at
each vertex, and likely along the sides of the cells as well. Indeed
there is a cubic polynomial (degree 3 in x and 3 in y, in fact) looming
in there, but no cubic_wave...

For now my code is horribly mangled, because it is doing some other
things such as blending with another pattern, etc. and I never tried to
extract the interpolation from there. I'll try to single out and clean
up this part, then post it.

I'm not too sure about the efficiency of my technique either, I
implemented everything with functions, and thus it spends a lot of time
re-computing things that could have been stored... I don't remember
exactly why I did it like that. It seems I have another non-working
version where I tried to use arrays... There could have been something
about being unable to read an array from inside a function, I believe.

-- 
Vincent

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