I once knew how to remedy this, and my old computer had Poser set up to defaults which avoided this problem with Firefly.  But my newer system has the trouble and I don't know how to fix it!

Can anyone remind me how to get rid of these black jaggie rendering artifacts?  Is it shading rate?  Shadow min bias?  Help!  It looks like I have the toxic Black Mold of Death in my bedroom set.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.