welll....yes and no. There's a plugin out there somewhere, called FEO (for export only), that allows you to export to a more commonly-recognized format (I think Lightwave's lwo). The trick is scaling. Poser's scaling vis a vis other programs is something else. Poser exports are tiny in other programs. Poser imports some things as gargantuan..;)
What you might want to try is rendering in Terragen, then taking the picture and exporting as the background. Dr. Geep has a background tutorial that explains how..

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)