AO pass is an approximation of perfectly soft shadow created by environment which has equal amount of light emitted from every point.
So to your question it's directional lighting shadow to omni-directional lighting shadow.
>>5740717>ambient occlusion is meme term, it pretty much doesnt happen in real lifethis
>>5740719>actually someone already wrote that nicely hereyes, but not here, wikipedia articles on 'global illumination' (image relevant), 'ambient occlusion' and 'shading' are much better at explaining.
To quote from articles: "it is a very crude approximation to full global illumination" and "Not a physically correct method, but it gives good results in general. Good for precomputation." ('Good' for real time applications 10 years ago)
I take issue with what David did here. I'd rather add lighting layers, not multiply shadow layers, that's a much closer approximation of physics. He ends up adding additional bounce and color lighting in in the final so...
