[vtkusers] vtkImagePlaneWidget has no output port

[Luca Pamparana]

Hi everyone,

I found a limitation in the vtkImagePlaneWidget and I was wondering what is
the best way to overcome it.

I want to pipe the resliced output of the vtkImagePlaneWidget to a
vtkImageViewer and it seems to work through the GetResliceOutput() method.
However, it does not seem to update the vtkImageViewer object automatically.
I have to manually call Render() on it.

Is there a way yo make this automatic like how it is in the pipeline.

Cheers,
Luca
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