In article <3fc74d84@news.povray.org>, "Rune" <run### [at] runevisioncom> 
wrote:

> I don't know that much about how patina should look, but I've got the
> impression that it's not dependent on light source location, like
> subsurface scattering is? If it's more a matter of curvature of the
> surface and nearby surfaces, then this macro might be sufficient:

It is a matter of curvature, or more precisely, accessibility. Oxidation 
and weathering that gets rubbed off of exposed surfaces while 
accumulating on more protected surfaces.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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