[vtkusers] observing itk registration process by vtk volume renderer

[klar1 at gmx.de]

Hi,
I want to track to progress of my registration program. My idea is instead of just using simple printout from itk observer to render the fixed and moving image after each iteration. 
So instead of an commandIterationUpdate() i want to trigger a vtk->render() after each iteration. Is there any manual, book or tutorial where i can find something about it? 
Thanks for your help!
Regards,

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