Errrr.... Isn't it about time we got a port of the Blender3d renderer? Its on practically all other platforms.
The source has been available for years now. It even has an associated game engine.
http://www.blender3d.org/I tried it the other night on my PC and the UI was a bit slow. Hopefully, I'll see the rendering is better when I get around to it. They UI is probably slow because its drawing it independently of the OS, which would ease porting and maintaining the code base.