- in current implementation, backedit feature is lost if user changes camera mode (for example from orthographic to
perspective, or oppositely). This happens because when changing camera mode, Coin actually do not just change a
parameter of the camera node, but delete the current camera node and add a new one to the scenegraph. Thus the
SoFieldSensor currently used (attached to camera orientation) is just detached and sensing is left -- notice is would
be same with a SoNodeSensor attached to camera node --. The solution is to attach the sensor at scenegraph root node
so it isn't lost when camera mode changed. No pre-check (such as checking if camera node changed since last call) has
been added currently because it would not actually reduce callback execution time (and even worsen it).
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