The winding order of the facets has been reversed. Sometimes it can be fixed in UVMapper (it has an option to reverse winding order), and sometimes you're just... f'ed... Many programs reorders the facets, I'm sure someone with more knowledge of C4D will pop in shortly and tell you if there are special steps one must take when exporting from C4D :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.