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finetjul authored
This new method can be handy because displayable nodes can have multiple display nodes (e.g. vtkMRMLScalarVolumeNode can have vtkMRMLScalarVolumeDisplayNode and vtkMRMLGPURayCastVolumeRenderingDisplayNode at the same time. Annotations have also typically more than 1 display node: textDisplayNode, controlPointsDisplayNode...). git-svn-id: http://svn.slicer.org/Slicer4/trunk@21537 3bd1e089-480b-0410-8dfb-8563597acbee
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