Attached Link: Poser ++

Masa has made an utility called MTMirror. But I must admit I've never been able to get it to work properly :o( At some point I think someone was working on a python script for that too, but I'm not sure who.

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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.