[vtkusers] HELP ME! HELP ME! HELP ME! HELP ME! HELP ME! Two questions (To see image attached)

[cyros at tiscali.it]

1-As to zero A , B, C, D? 
                  or
2-As to move the render so that E and F coincide?

To see image attached.

Obviously all not with the interaction of the mouse, but in a method to the start of program!




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