Lance Birch wrote:
> 
> To my knowledge none of them use fractal-based formulas, they are based on
> patterns that aren't fractal in nature, or am I mistaken?

That depends on how you define 'fractal' - if you do so via a recursive 
definition they might not be (although every recursion can be replaced 
by a loop as you might know).  If you do so via the property of 
self-similarity they certainly are (a lot of POV-Ray's builtin patterns 
/functions as well as turbulence warps have self-similar properties).

Christoph

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