Some tries for irregularities in the wood, the upper plank uses good old
black_hole warps positioned on the surface of the wood by the macro.  

It would be nice to be able to change the color at the knotholes, but
right now there is no way to determine the position of black_hole warps
placed with repeat and turbulence.  Placing the single knotholes would
only help if i use a fairly complicated and slow function pigment.

The second plank has a changing surface roughness done with a gradient
pigment_map.

The cylindrical wood uses a displace warp for disturbing the wood
structure.

Comments welcome,

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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