Switching collision filter

Has anyone figured a way to do this? Example: Having a ball bounce against a wall and switch its collision filter value, as if tripping a switch.

My guess would be to have two sets of bodies with different filters, one deactivated as an invisible child of the other, until the switch occurs, at which point they are swapped round. [import]uid: 8271 topic_id: 23303 reply_id: 323303[/import]