I am not aware of such a converter, but there is/was a way to convert .DXF .OBJ and .3DS to .IV files - http://www.sv.vt.edu/future/vt-cave/VT/CAVESLUG/file_conv/ Let us know if this helps. Edit: and I think that it can read VRML files. Search this thread http://forums.sketchucation.com/viewtopic.php?f=40&t=24522 for some additional info on getting an VRML file into SU.