The perlin-noise function itself has got nothing to do with fractals 
(correct me if I'm wrong :-)

You get something that's called "Fractal Brownian Motion" (FBM) when you 
add "turbulence" to the pigment. The POV-Documentation explains how 
turbulence works.

-Sascha

Andrew Coppin wrote:
> A fairly good introduction can be found on:
> 
> http://freespace.virgin.net/hugo.elias/models/m_perlin.htm
> 
> 
> Thanks. This was helpful.
> 
> So, essentially, the Perlin noise function is built on a normal random
> function where a point (in whatever dimensionallity of space) is the seed,
> yielding the randomness between distant points. Then interpolation is used
> to make points nearby have similar values. Oh, and the fractal bit - several
> different interpolated random functions of different wavelengths and
> amplitudes are added together for extra "natralness". Is that about how it
> works?
> 
> Andrew.
> 
>

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