What this kind of reminds me off is how those 'dirt/rust' plug ins for 
other 3D programs calculate where to place the texture map that will be 
the dirt/rust (as those things tend to collect in corners)...

Arlo

Samuel Benge wrote:

> In the image, notice how the edges of the (somewhat goofy) CSG object 
> are highlighted: outside edges appear white and inside edges appear 
> black. Topologically-challenged areas appear grey. Using this as a 
> texture_map, one can make the outside edges have a dented appearance and 
> the inside edges look pristine.

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