[vtkusers] Interactive cut plane

[Eigil Samset]

I'm implementing an interactive cutplane using a vtkClipPolyData with a
vtkPlane as the implicit function. In order to move the plane around I use
the SetTransform method on the vtkPlane. This gives far from interactive
speed. Whenever I set a new transform it takes in the order of 1s to update
the display (changing the camera pos/orientation is instant). Any other
suggestions?

Eigil