When making wood textures I always run into the same problem. The wood 
pattern is too regular. Turbulence seems to make it irregular but not in 
the way real wood is. There are a few problems with the current wood:
  The constant size of the year rings. On a real tree they vary in size. 
The summer part of a ring is wider than the winter part and each ring 
(summer+winter) also varies from year to year.
  A tree is not round. Depending on the circumstances it grows in, it gets 
it shape. If the wind is blowing always from one side, the tree will grow 
extra wood on the opposite side. The shape will be more triangular or has 
three or more lobes. Also a tree can be "getordeerd" (don't know the 
English word, it is as if you fix the roots at their position and rotate 
the crown of the tree a few times around z-axis).
  Is there a way to create a better pattern with an isosurface? an 
somebody point me in the right direction, I lack the math ablility to 
figure out something that works.

Ingo

-- 
Photography: http://members.home.nl/ingoogni/
Pov-Ray    : http://members.home.nl/seed7/

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