28     ren = vtk.vtkRenderer()
29     ren.SetBackground(0.5, 0.5, 0.5)
31     renWin.AddRenderer(ren)
41     ren.AddActor(actor)
57     ren.AddActor(textActorL)
58     return (ren, actor, mapper)
60 ren, actor, mapper = add(interpolate_scalars_before_mapping=1, ambient=0.49,  variable
62 ren.SetViewport(0, 0, 0.5, 0.25)
64 ren, actor, mapper = add(interpolate_scalars_before_mapping=0, ambient=0.49,  variable
66 ren.SetViewport(0.5, 0, 1, 0.25)
68 ren, actor, mapper = add(interpolate_scalars_before_mapping=1, ambient=0.49,  variable
70 ren.SetViewport(0, 0.25, 0.5, 0.5)
72 ren, actor, mapper = add(interpolate_scalars_before_mapping=0, ambient=0.49,  variable
74 ren.SetViewport(0.5, 0.25, 1, 0.5)
76 ren, actor, mapper = add(interpolate_scalars_before_mapping=1, ambient=0.49,  variable
78 ren.SetViewport(0, 0.5, 0.5, 0.75)
80 ren, actor, mapper = add(interpolate_scalars_before_mapping=0, ambient=0.49,  variable
82 ren.SetViewport(0.5, 0.5, 1, 0.75)
84 ren, actor, mapper = add(interpolate_scalars_before_mapping=1, ambient=0.49,  variable
86 ren.SetViewport(0, 0.75, 0.5, 1)
88 ren, actor, mapper = add(interpolate_scalars_before_mapping=0, ambient=0.49,  variable
90 ren.SetViewport(0.5, 0.75, 1, 1)