[vtkusers] Information during callback / vtkImplicitPlaneWidget2

[Sebastian Gatzka]

Hello world.

Is it possible to update a vtkTextActor during a Callback function?

I'm using the callback function like the one from the 
vtkImplicitPlaneWidget2 example: 
http://www.cmake.org/Wiki/VTK/Examples/Widgets/ImplicitPlaneWidget2
I want to be able to display the current center of the widget and its 
normal direction in text form!

Any ideas?
Sebastian
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