Attached Link: http://www.xdsoft.com/explorer/

I thought that Bryce imported 3dmf. Maybe it was Bryce 2. Too bad you're on a MAC. XDimension Software has an affordable ($40) program called 3D Exploration that does a great job of converting .3dmf objects to .obj or .3ds formats. Unfortunately its only for a Win9x or NT. The link is included below, just in case you can run it in an emulator...