if continuous updating is set to false.
The problem was being caused by the camera update call never being made
if continuous updating was not set to true. This fix adds a flag that
is set when dirtyOverlayTexture() is called and checked in the update
visitor section of the traversal to determine if the camera should be
updated.
I tested the fix by making some changes to the osgAnimate example
program so it has continuous updating off and calls dirtyOverlayTexture
for each frame. The overlay texture now displays properly."
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