> > > Ken Perlin recently updated his perlin noise algorithm with a new
> > > polynomial S-curve function that eliminated second-derivative
> > > discontinuities, maybe that could be of some use as a bounded
function...
> >
> > Do you have any details of this? Sounds quite interesting...
>
> The new polynomial is "1 - r*r*(3 - 2*r)".


Uh, this polynomial doesn't elliminate second derivative discontinuities.
It's the same one currently used for the noise function in POV-Ray. The
second derivative at zero is 6, and the second derivative at 1 is -6.

 - Slime
[ http://www.slimeland.com/ ]

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