The current version of Bryce will only export mesh-based objects, i.e. rocks, terrains, or imported meshes.

Booleans can't be exported in the current version, but can be in Bryce 6.

To export a mesh, you will need to hit the E button, then Ctrl-D to bring up the export menu.  Useful for a quick and dirty translator.

Come visit us at RenderGods.

Ignore the shooty dog thing.