[IGSTK-Developers] Visibility Test Added.

[Luis Ibanez]

Hi Patrick

The test for the Visibility/Invisibility functionality of the
SpatialObjectRepresentation class has been added.

You will find it under

    IGSTK/Testing/
     igstkSpatialObjectRepresentationVisibilityTest.cxx

The associated bug was created and closed at:
http://public.kitware.com/Bug/bug.php?op=show&bugid=3609&pos=0


The Visibility functionality is behaving as was planned in
the StateMachine of this class.


If you have a chance, please take a look at this test,
to see if it give you some hints on operations that may
be missing in your application when you see the objects
disappear.

Otherwise we should check the synchronism of the View TimeStamps
and the representation classes in your application.


   Please let me know what you find.



      Thanks


         Luis