[vtkusers] update rendered volume

[Baliki baliki]

Hi,
i noticed that when i render a volume it's not rendered as it is supposed to
be (e.g. not as smooth as it should be, or with some "artifacts" on it).
I need to click (or drag, or press 'r') on render window to be updated(?)
and rendered normally.
I've tried reset camera(programmatically) and render.Render(); not success.
I use Java and i render on a JFrame.
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