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I've been meaning to post this for a while.

I find that setting AO on on the brightest light in the scene works quite well, at least in Poser 7.

No teeth visible in these examples, but it works. Check out the 'nose glow'.

1. No AO on main light, depth-mapped shadows
2. AO at 0.5 on main light, depth-mapped shadows
3. A0 at 1.0 on main light, ray-traced shadows

The difference in render times (firefly, obviously) between 1 and 2 is negligible. 3 takes considerably longer; I think it's better, but not by much.

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Windows 10 x64 Pro - Intel Xeon E5450 @ 3.00GHz (x2)

PoserPro 11 - Units: Metres

Adobe CC 2017