Control multiple cameras with the same controls : <p>I have two different threejs scenes and each has its own camera. I can control each camera individually with a corresponding <code>TrackballControls</code> instance.</p>

<p>Is there a reliable way to 'lock' or 'bind' these controls together, so that manipulating one causes the same camera repositioning in the other? My current approach is to add <code>change</code> listeners to the controls and update both cameras to either's change, but this isn't very neat as, for one, both controls can be changing at once (due to dampening).</p>
