In my utility you can select any polygon with wrong normals and then invert them. Often 3ds meshes have some faces with inverted normals and also duplicated faces that render black in Poser. You can select these faces and invert or delete them. It must be done by hand one by one, no authomatic procedure can be done, but is very easily done by this program unless you have 50000 faces to correct!

Stupidity also evolves!