I was waiting for someone to catch that
There's a third party renderer called Yafray (Yet Another Free Ray Tracer) and various programs that can export to yafray from 3d modeling programs. There's a MAXscript utility thingy that converts a gmax scene into the proper text format. A little program that converts the text into an .xml file (the kind that yafray reads) and then yafray itself which makes the render. It may sound like a lot of trouble but it's pretty easy once everything's set up right.
btw, I was wondering if and how I could get different FS2 effects into gmax (beams, gunfire, subspace portals, etc.) would I just have to make a plane and texture it?