The trick recently discovered by SamuelT in his  "chipped paint" series in
p.b.i. could be used for that : create a pigment pattern and then associate a
pigment function as a normal with a properly defined color_map. When the two
match, it gives interesting results. Of course, it will work only with
simulated shallow cracks, not with real 3D crevices and other real surface
perturbations, like folds.
Gilles

Ken wrote:

> 2. (Fine Arts) The color or incrustation which age gives to works of art;
> especially, the green rust which covers ancient bronzes, coins, and medals.
>
>  It is quite common to see a patina discoloration inside the cracks,
> crevices, and deep folds on sculpture while it's surface maintains
> more of the original material's coloration.
>
>  How would one apply this affect to a 3d object with proceedural methods
> rather than relying upon complicated image maps ?
>
> --
> Ken Tyler -  1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
> http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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