vtkPropPicker in VTK 9.1 is now returning wrong world coordinates.

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So, inspired by your solution, I came up with a little dirty trick in my mouse-up event:

        m_ParentView3DWidget->getForegroundRenderer()->SetPreserveDepthBuffer( true );
        m_ParentView3DWidget->getRenderer()->Render();

        [PICKING CODE]

        m_ParentView3DWidget->getForegroundRenderer()->SetPreserveDepthBuffer( false );
        m_ParentView3DWidget->getRenderer()->Render();

So, I believe the change to the GetZ method proposed by me can be reverted to restore it’s previous performance.

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