[vtkusers] How to update renderer from a point in the visualisation pipeline

[Ali -]

vtkImageImport can accept a C array as image data and, when connected to the 
right visualisation pipeline, it can show the image. When the C array is 
changes, the modified() method in vtkImageimport is invoked, however, this 
does not update the render window and the change in the image cannot be seen 
unless the render() method of the renderer is manually called, eg by 
clicking on the render window.

How is it possible to update the render window whenever the pipeline is 
modified? (What is the point of calling modified() when the final result is 
not automatically rendered, anyway)

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