[vtkusers] border for viewports

[Meisam Aliroteh]

Hi,

I have a render window that is vertically split into 2 pieces and each piece
has its own renderer. Both of these renderers must have a white background
so it is difficult to visualize where one viewport ends and the other
begins. I want to know if there is a way in vtk to show borders (like a
rectangle) around each renderer?

thanks
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