Fig.08 - 09 show the general settings for the wood material.
You will notice that the V-Ray dirt in the diffuse channel has a small radius, so that it does not go too far over the real wood diffuse. Also by ticking Invert Normal the parameter will change the direction of the raytracing. When it is off the rays are traced outside the surface; when on they are traced inside the surface. Basically it means that the dirt areas will appear on all the edges (if bias X, Y and Z are set to zero) (Fig.10 - 12).
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