I need to determine if there's a line of sight between two points. 
Does FlightGear currently support this type of thing?

Also, and this is a separate issue, I notice that when I'm using an
external view, such as tower view, the terrain elevation FlightGear
returns is at the location of the view source.  How do I know the
elevation at the aircraft location?  I'm currently using a call to
globals->get_scenery()->get_cur_elev(), which only works if the view
is located at the aircraft.

Thanks,
Drew

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