[vtkusers] Manipulte a vtkActor through its vtkMatrix4x4

[Boettcher, Dr. Peter]

Hi,
 
I would like to manipulate a 3D-object (vtkActor) using vtkMatrix4x4. Unfortunately once the actor has been drawn, changing the matrix (actor->SetUserMatrix) results in no change. This works only once before the actor has been added to the vtkRenderer. Up to now I remove the actor, delete it and construct a new one with the modified user-matrix each time I like to manipulate it.
 
Regards, Peter.
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