In article <web.3f26493e63b187465c8e72650@news.povray.org>,
 "David" <dh2### [at] iucrorg> wrote:

> Sorry I must have phrased it wrong. What I want is away of simulating dirt
> collecting in corners.

And things like paint/tarnish wearing off edges? This is often called a 
"patina" effect, you might also find what you want by looking for 
"erosion". My curvature pattern patch attempted this (with only some 
success, it was far too grainy...I might be able to fix that though). I 
think you could generate a DF3 of the object, process it a little, and 
use it as a pattern. Or generate a mesh and use an external program to 
come up with good vertex textures. For a simple object like a box, you 
might be able to just use a spherical pattern.

http://graphics.lcs.mit.edu/~dorsey/papers/patina/

And a Scientific American article about the same work:
http://tinyurl.com/ievt

-- 
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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