RealtimeRenderPasses in the ViewCapture

Hey all, what does the RealtimeRenderPasses mean in the ViewCapture? I noticed that the CaptureToBitmap is finished immediately. How do I get the high quality output as if I’m using the render button in the UI? Thanks!

        rhinoscriptsyntax.EnableRedraw(True)
        rhinoscriptsyntax.ViewDisplayMode(viewport_name, "Rendered")
        rhinoscriptsyntax.ShowGrid(viewport_name, show=False)
        rhinoscriptsyntax.ShowGridAxes(viewport_name, show=False)
        rhinoscriptsyntax.ShowWorldAxes(viewport_name, show=False)

        view_capture = Rhino.Display.ViewCapture()
        view_capture.Width = selected_view.ActiveViewport.Size.Width
        view_capture.Height = selected_view.ActiveViewport.Size.Height
        view_capture.ScaleScreenItems = False
        view_capture.DrawAxes = False
        view_capture.DrawGrid = False
        view_capture.DrawGridAxes = False
        view_capture.TransparentBackground = True
        view_capture.RealtimeRenderPasses = rendering_pass
        bitmap = view_capture.CaptureToBitmap(selected_view)
        if bitmap:
            temp_dir = tempfile.gettempdir()
            random_filename = str(uuid.uuid4()) + '.png'
            file_path = os.path.join(temp_dir, random_filename)

            bitmap.Save(file_path, System.Drawing.Imaging.ImageFormat.Png)
            print(file_path)

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