Of course you could vary the effect by replacing marble with wood, etc.

For an interesting woodcut effect, you could render a scene once
normally, and then again with no lights, giving each object a gray
marbled (or wood) pigment; and threshold one against the other.
(Does that make sense?)

Any GIMP mavens here?  Is there a way to threshold one image against
another?

-- 
Anton Sherwood  --  http://www.ogre.nu/

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