"Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> wrote in message 
news:web.41d43a112a18c3f78a85f6810@news.povray.org...
> I'm currently working on a model of an object that is supposed to be 
> fairly
> old and I was wondering how to simulate the effects of age.
>
> f.ex. tarnish (the object is made of 0.75% Silver 0.25% Copper, I imagine
> that after a while there would be some discoloration.) and rubbing (I've
> considered using the object pattern to turn it into an isosurface and then
> adding patterned or something like that but I'm not sure how this would be
> done.)
>
> Any hints or suggestions would be appreciated.
>
> ADB.
>
I'd go with layered textures, or texture maps. Find an example of the 
material in question and look at it really closely :)

- Grim

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