How to transparently render only the background

Support
1

I’m trying to use vtk on pyqt5. I just need to display the model in the background of my window. The background rendered by Renerer is too ugly. Can I make the background of Renerer transparent?

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2

Stack Overflow had a similar question.
The VTK link they point to is broken, but was probably meant to be this page?

3

Thank you for your answer. I will try this method when I have time.