I'm looking to create an effect where an object (for the sake of simplicity, lets say is just a box), can be affected by rbd objects, but only rotationally, and the center position of this box remains locked at a single point position. You can kinda imagine if the object is suspended in a gravity field where it's center of gravity doesn't move, but it's able to rotate freely and be influenced by other objects. The only sources I could find that deal with constraints like this either involve multiple object strung together, or some kind of spring constraint. I just want the object to rotate around it's center point when influenced by another rbd object, without changing it's center point position.
Any help would be greatly appreciated.