[vtkusers] what's the difference between actor 's position and sphere 's center ?

[Jochen K.]

Hi yeonchool,

vtkActor.SetPosition() simply effects where your actor is rendered, but do
not modify any coordinates of the underlying polydata physically.  
Therefore you should use SetCenter() like you do or better apply a
vtkTransformFilter to modify point coordinates actually.

You may have a look at the doxygen manpage for vtkTransfromFilter, where
this behaviour is explained. 

with best regards
Jochen

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