Use Wavefront OBJ (hint: it's better) if available.  Portions missing sounds like inverted polygon normals - fix them in 3DS before export!  3DS versus just about every other 3D software in the universe has a different notion of 'what's up'.  You'll typically find your 3DS objects rotated 90d from what they were in 3DS - this needs to be corrected (I think with an X rotation).  Having never-ever used 3DS format for import into Poser, I donot rightfully know if Poser auto-corrects the coordinate system rotation for you.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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