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Hullo, we are trying to set the location of an object on the screen by taking data from an external device while using physics for detecting edges for bouncing. Yet, albeit callBack contactEnded is normally called when reaching edges, the object does not bounce against the walls. We tried removing the b.setPosition(positionX,positionY); call and again normal physics applies. Even mouse inputs have effects on data. How may we input a brand new couple of screen coordinates to an FCircle and take advantage on the physics engine to have it bounce? On a similar vein, we also tried changing gravity to simulate acceleration, but in that case the object does not even move. Any suggestion?