Hmmmm....

My impression is that that registering an object as a physics object nullifies the possibility of doing this by setting .passable flags and such.

How about having the girl have a constant ent_move update routine that places her maybe 5 quants above and 5 quants forward of the swing.

This way, as the swing swings, the girl will always be moved to be relative to the swing.

maybe this will work??