Picking point on polydata in bottomost layer

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Picking point on polydata in bottomost layer

I have 2 renderers, both are on the same viewport. Bottom layer is the main
renderer and the top one is used to render actors which needs to be on top
of all actors of bottom layer.

I would like to pick point on polydata of bottom layer. I am using
vtkWorldPointPicker. It seems there is a problem with Z buffer data in this
scenario. Does anyone have a solution for this?

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