[osg-users] CompositeViewer:: checkNeedToDoFrame() always returns true after adding an UpdateCallback

[Robert Osfield]

Hi Lincoln,

If you know that your updates don't always need calling you customize the
behaviour of the viewer by subclassing from CompositeViewerViewer and
override the run() or  checkNeedToDoFrame() method and let this code decide
when a new frame is required.

Robert.
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