There is a plugin for MAX called DirtyReyes which does just this, and very
realistically.  Unfortunately it uses mapping coordinates of the mesh and
thus I don't think could be implimented easily with POV-Ray.

--
Lance.
The Zone - http://come.to/the.zone
Ken <tyl### [at] pacbellnet> wrote in message
news:38158BD5.F0F02B93@pacbell.net...
>
>
> 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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