[vtkusers] update renderwindow in real time

[Ashish Singh]

Hi,

I created a volume in a renderwindow. I am changing the color of the volume
in real time through a callback function and using GUI. But the color change
is not visible on the volume until I start interacting with it(not until I
click in the renderwindow). How do I update my renderwindow so as to be able
to view this change in real time?
What is the function that I need to call?

Thanks,
Ashish
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