I am just curious - did someone tried to implement this in POV?
Something like at
http://www-viz.tamu.edu/students/bmoyer/617/ambocc/
Seems to be popular in renderers like a Mental Ray, Lightwave (gMill, I
think).
Big advantage of AO is apllying local as material, usually it probe geometry
only,  without lighting or colors, and simply do holes darker, so it can
process a lot of details, very fast....

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