[osg-submissions] Add slave camera

[filip.holm at kongsberg.com]

Robert,

This fixes problem with scene data not being attached to slave camera if viewer already has scene data assigned to it. Which was the actual reason I could not see scene data in the CompositeViewer example I posted on the osg-users a couple of days ago.

Consider the following example.
.....
osgViewer viewer;
viewer.setSceneData(pSomeSceneData);
viewer.addSlaveCamera(pSomeSlaveCamera,true); //Expecting pSomeSlaveCamera to be assigned the masters scene data
viewer.run();
.....

Note:
If you're wondering why I have overridden the convenience method addSlaveCamera(Camera*,bool);
It's because of C++ is using hide by name rather than hide by signature. I had not realized this limitation before, so it took me some time to figure out the best approach.

Thanks for this great open source project.

Filip
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