Once I had similar artifacts (especially with the hair) when using DAZ figures.
As far as I remember (well, had no time for 'poving' since years) it had to do
with floating point (in)accuracy when using meshes with a scale like
1 PoV-unit = 1 m.
By scaling the mesh-figures (and of course the whole scene) in a way that
1 POV-unit equals 1 cm the artifacts went away.
Maybe you have the same problem...
regards
-Ive
