def trace3D(self, join=True):
        """Give a 3D representation of the traceroute.
        right button: rotate the scene
        middle button: zoom
        shift-left button: move the scene
        left button on a ball: toggle IP displaying
        double-click button on a ball: scan ports 21,22,23,25,80 and 443 and display the result"""  # noqa: E501
        # When not ran from a notebook, vpython pooly closes itself
        # using os._exit once finished. We pack it into a Process
        import multiprocessing
        p = multiprocessing.Process(target=self.trace3D_notebook)
        p.start()
        if join:
            p.join()