I created a tutorial to export Max to B3D format a month ago, hope it can help people.
http://www.blitzcoder.com/cgi-bin/ubb-cgi/postdisplay.cgi?forum=Forum14&topic=000776
http://www.blitzcoder.com/cgi-bin/ubb-cgi/postdisplay.cgi?forum=Forum14&topic=000776