assuming that you are referring to
this thread, none of this has been implemented yet. Basically, this will require a different way of using OSG viewer in FG:
http://wiki.flightgear.org/Howto:Use_a_ ... siteViewerIt is my understanding that all core developers are supportive of this change but that nobody is currently working on it, also it would touch quite a few places in FG/SG:
viewtopic.php?f=6&t=18813&p=174772&hilit=compositeviewer#p174772I'm not sure about Tom's opinion here, but a while back he mentioned that it would be trivial to add this to the canvas system once FG as a whole has switched to CompositeViewer. Overall, this would also be useful for tail cameras or aircraft mirrors. For a "synthetic view" one would only need to add hooks to also use the effects/shader framework to change the appearance of the camera view and make it differ from the main scenery.