Hi, I don't know the specifics of box2D but assuming you are controlling the 3D object's xz position with a box2D container all you need is to start dragging the corresponding box2D container once you click on the Away3D object.
You need to create the connection in code somewhere in your event handler for MouseEven3D.MOUSE_DOWN for the 3D objects. An easy way is setup 2 vectors, one where you store a reference to the 3D object and one for associated the box2D container. Or you could have a box2DContainer variable on a custom class for you 3D object. ath. Jerome.
