[vtkusers] Cell Picker

[JohnMark]

Hi,
recently I try to pick a cell( a point or a polygon ) from volume rendering using vtkCellPicker , but I find that it can only pick a cell from the surface rendering ,so  I have a question , is there any classes that can pick cell from the volume rendering ? if it is , what the classes are ? could you give me a help ? thank you very much . 
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