FBX format, which Poser 11 added support for, is the best and easiest (for a dev team to update) means I can see of moving stuff between different applications which is what it is used for already. Dedicated import/export plug-ins would be ideal but would have to be maintained and updated with every change to the other application. It is possible - look at the plug-in for Octane, developed by face_off, for an example - but would take time and effort, so IMO would be best done by a third-party.

To the best of my knowledge, a core rewrite of Poser would only be necessary to address what vilters calls the 'masterbug' which is just the way that Poser has handled skinning (i.e. how it assigns bones to geometry internally) since the first version.

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