[vtkusers] vtkAssembly vs vtkPropAssembly vs vtkPropCollection

[transformer]

Hi,

Can anyone compare these three classes? I am confused about which one to use
especially between vtkAssembly and vtkPropAssembly. 
Is vtkPropAssembly a superset of vtkAssembly since vtkActor is only a
subclass of vtkProp? 
Thank you very much.

Best,
xunlei
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