[vtkusers] Visibility of vtkAssembly

[Weiguang Guan]

Hi VTK-users,

I have a nested usage of vtkAssembly. One vtkAssembly object contains 
another vtkAssembly object in addition to some regular vtkActor objects. 
The inner vtkAssembly contains two vtkActor objects. The problem is 
VisibilityOff() doesn't work for the inner vtkAssembly although it works 
fine for the outer assembly.

I've found discussions of this problem in this mailing list back to 
2010. I wonder if this problem is still there ...

Best,
Weiguang