I've used Sweethome3d for many years, and used to model furniture using Art of Illusion. I seem to vaguely remember that one could name an object in AoI with something like sweethome3d_window_pane, and it would automatically be transparent when the OBJ file was imported.

I am now using a very old version of 3D Studio called GMAX and wonder if the same technique can be used. However, I have searched the forum for a memory refresh and can't find any reference to these names. Can anyone help please?