[vtkusers] vtkHardwareSelector Can't work with vtkUnstructuredGrid data?

[Xianliang.Zeng]

Hello


I want to select cells in a vtkUnstructuredGrid data, and I created a vtkHardwareSelector for it. And then I found nothing can be selected.
By the way, I test the vtkHardwareSelector with a vtkPolyData, and it works well. 
So, why can't vtkHardwareSelector select cells from vtkUnstructuredGrid? 


Best regards,
Shane
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