    ren = vtkOpenGLRenderer()
    ren.SetBackground(colors.GetColor3d('Black'))

    ren_win = vtkRenderWindow()
    ren_win.SetSize(600, 600)
    ren_win.AddRenderer(ren)
--
    ren = vtkOpenGLRenderer()
    ren.SetBackground(colors.GetColor3d('Black'))
    ren.AutomaticLightCreationOff()

    light = vtkLight()
    light.SetPosition(2.0, 0.0, 2.0)
--
    ren = vtkOpenGLRenderer()
    ren.SetBackground(colors.GetColor3d('Black'))

    ren_win = vtkRenderWindow()
    ren_win.SetSize(600, 600)
    ren_win.AddRenderer(ren)
--
    ren = vtkOpenGLRenderer()
    ren.SetBackground(colors.GetColor3d('Black'))

    ren_win = vtkRenderWindow()
    ren_win.SetSize(600, 600)
    ren_win.AddRenderer(ren)
--
    ren = vtkOpenGLRenderer()
    ren.SetBackground(colors.GetColor3d('Black'))
    ren.AutomaticLightCreationOff()

    light = vtkLight()
    light.SetPosition(2.0, 0.0, 2.0)
--
    ren = vtkOpenGLRenderer()
    ren.SetBackground(colors.GetColor3d('Black'))

    ren_win = vtkRenderWindow()
    ren_win.SetSize(600, 600)
    ren_win.AddRenderer(ren)
--
    ren = vtkOpenGLRenderer()
    ren.SetBackground(colors.GetColor3d('Black'))

    ren_win = vtkRenderWindow()
    ren_win.SetSize(600, 600)
    ren_win.AddRenderer(ren)
--
    # ren2 = vtkOpenGLRenderer()
    ren2 = vtkRenderer()
    ren1.SetBackground(colors.GetColor3d('Snow'))
    ren2.SetBackground(colors.GetColor3d(parameters['bkgcolor']))

    render_window = vtkRenderWindow()
--
    # ren2 = vtkOpenGLRenderer()
    ren2 = vtkRenderer()
    ren1.SetBackground(colors.GetColor3d('Snow'))
    ren2.SetBackground(colors.GetColor3d(parameters['bkgcolor']))

    render_window = vtkRenderWindow()
--
    # ren2 = vtkOpenGLRenderer()
    ren2 = vtkRenderer()
    ren1.SetBackground(colors.GetColor3d('Snow'))
    ren2.SetBackground(colors.GetColor3d(parameters['bkgcolor']))

    render_window = vtkRenderWindow()
--
    renderer = vtkOpenGLRenderer()
    renwin.AddRenderer(renderer)
    renwin.SetSize(640, 480)

    seq = vtkSequencePass()

