[vtkusers] vtkImageSlice using UserTransform

[Miro Drahos]

Hi David,
I was hoping you could advise on an issue I am experiencing with 
vtkImageSlice.
Together with the sliced image I am rendering a surface model in the 
scene, that the user needs to be able to pick and interact with. When 
the surface (~ 20000 vertices) is picked, I call SetUserMatrix() on its 
actor to render the translation or rotation that user is performing in 
real-time.
This, however has a side-effect that vtkImageSlice uses the matrix and 
so the displayed slice is modified during the interaction.
Is there a way to tell vtkImageSlice not to use the UserMatrix? Or 
perhaps is there a better way to set the transformation matrix on the 
surface/its actor to render the interaction?
I turned SliceAtFocalPointOff() and SliceFacesCameraOff() but that 
doesn't change this behavior.
Thank you!
Miro

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