I'm not sure if it works, but I think you'll have to have a reflection map that matches the transmap, so that the invisible parts of the transmap are black on the transmap as well. This way it outta work, but I can't try it as I 'm at work, without Poser :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.