A simple test to simulates a type of corrosion.

The render uses an ambient occlusion image as the pattern that in turn 
chooses between bronze or corrosion (modified by a mild slope pattern, 
and a bit of randomness supplied by bozo).

Looking at some real bronze statue photographs on the interwebs, I 
reckon I'm a long, long way from getting real corroded bronze, but at 
least the general direction looks promising...

The second image is the ambient occlusion pass.

Cheers,
Edouard.

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