[vtkusers] Help! about vtkTransfrom

[Hsiang]

Dear friend:
The document says:
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            void vtkTransform::Push  (     )  [inline] 
     

         Pushes the current transformation onto the transformation stack. 


     

but where is the transformation stack and how to use the method "Push()","Pop()"?

please give me a hand                          thank you very much                  
                                                                                                      younger
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