have you already tried black hole warps?  i haven't used much wood, but
i know people have used warps to do things like knot holes.

ingo wrote:
> 
>   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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