@Pakled: In Poser's preview mode it's easy to tell which way the normal is facing. When it's facing the camera, you see the facet.  When it's facing away from the camera, you don't see the facet.  When rendered (in P6 and 7, anyway) the facing-away facet is "incurably black".  (Won't take a texture).

I don't know if this has been mentioned in the thread, but Poser doesn't read the
list of normals (vn lines) generated by the modeler.  Poser only pays attention
to the winding order. 

In this picture I've labeled the vertice indexes, and the facet statements (the "f lines")
as they'd appear in the OBJ file.  The forward-facing facet has a counter-clockwise
winding order (1,2,5,6) and the rear-facing facet has a clockwise winding
order (2,5,4,3).  The winding order given by the "f lines" is what Poser reads, 
regardless of the normal statements ("vn lines") in the OBJ.

My python page
My ShareCG freebies