I just saw something yesterday about Maxon's Cinema 4D (an excellent renderer) working with native ArchiCAD files, as I recall. They wrote the add so convincingly that I thought for a moment it was by Graphisoft. I don't know where I saw it but it SOUNDED like the new C4D will work directly with AC files, as if it's a part of AC now.
Just a FYI.
I'll look for the link when I get a chance here...
http://www.maxon.net/pages/solutions/archicad/archicad_e.html
&
http://maxon.digitalmedianet.com/articles/viewarticle.jsp?id=27465
That above tool two posts above, for 3DS (it's in the ML menu, by the way, not under files\import-export!) gives some nice options once you begin the process- (watch it remove that AC "sun" spotlight... don't worry, it WILL! lol!!) ...after it's imported the basics it opens up a material replacer and you can just go through or even load a saved profile for regular imports into 3DS from your AC work. Pretty handy!
-p.s. -OH, I bring it up because I use 3DSM for rendering- or I did. Now I will probably be using it for building custom objects, since it's easier and I'm used to it over AC. But C4D if working with AC, hmmm... NICE renderer!