JRG wrote:
> 
> Did you start with some *hand made* sketches? By "hand made" I mean made
> with a paint program.
> 

Not really, i used a faulting algorithm like described for example in:

http://www.lysator.liu.se/~johol/fwmg/fwmg.html

with very few iterations and applied a differentiation filter afterwards. 
The result is similar to drawing some random lines.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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