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Thanks for the reply! About the post-process stack, what do you think about Unity's screen space AO? I tried it several times in my projects, but I  couldn't get it right just yet... It seems to me it does not take into account if the spot is originally illuminated or  not, it places the effect on any crevice it finds.

I needed it only to define form in this relentlessly white-on-white environment. Unlit forms had to be defined just as well as lit forms. And photorealism was not an aim of mine, so SSAO worked for me.  I would love to be able to tweak a few more things about the AO tho, so maybe since it's so important to my game, I should hunt for a more full-featured one and pay for it...