[vtkusers] how to set gradient background when using vtk.js?

[Jounly]

Hi,
   As the title, how can i set a gradient background when using vtk.js?
I use the way below to set the background color, but it's not gradient.
Could anyone give me a hint on this?
/
const fullScreenRenderer =
vtkFullScreenRenderWindow.newInstance({background:[0,0,0]});/




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