They may have improved it but you used to have to export the scene as an obj file, then collect all the image maps into the same folder as the obj. Then you import into Bryce. The poser node based materials dont work in bryce.

As i said that was a few years ago and the later bryce versions may have been improved.

I believe there is a base version of Vue that offers Poser import and rendering that might be easier than Bryce.