That's a nice effect. You say it's noisy and can get slower for complex 
scenes. Sunflow has fast and clean AO, you should check out the source and 
see if you can get some ideas.

Also, Blender's AO is very slow if you have a large object (like a large 
quad for a floor), but you can speed it up by a factor of 2 or 3 if the 
octree is larger. You probably know this already, but I thought I'd mention 
it.

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