The lights are three spotlights. In this instance, two lights have shadow min bias of .05; the other had 0.212. That may be a key part in the artifacting; usually I keep the SMB between 0.15 - 0.2; much lower, and Poser gives strange reactions (although not as bad as it used to be when I used AO rather than IDL).

Blur radius ranges from 4.0 to 4.6, which is perhaps a little high. Shadow samples range between 48 and 62. I can't say I'm really precise with these particular settings yet.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3