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A very clumsy way is to use a layered texture with the "patina" pattern
going from inside out with more opacity nearer the middle, like a spherical
or onion, then scaled to fit as well as possible. Not really good for
anything except roughly spherical or some other basic shape.
A real good way, if it could be done, would be to use the object itself as
the pattern somehow. Only thing I can think of that might come close would
be a media-filled one scaled appropriately to hug the surface of the
original object. Maybe same could be done by using fade_distance in a
semi-transparent copy too. I just can't imagine fitting them together well
enough.
I'm just brain-storming (hazy sky, more like) because I've always liked the
idea of following the contours of a surface and applying that antiquing
effect. Nothing tangible has ever come of it, so I'm all ears.
Bob
Ken <tyl### [at] pacbell net> 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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