new_contents: ############################################################
  from vtk import *
  ############################################################
  
  # Create sources
  arc = vtkArcSource()
  arc.SetCenter( 0, 0, 0 )
  arc.SetPoint1( 1, 0, 0 )
  arc.SetPoint2( -1, 0, 0 )
  arc.SetResolution( 32 )
  sphere = vtkSphereSource()
  sphere.SetRadius( 0.05 )
  sphere.SetCenter( 0, 0, 0 )
  sphere.SetPhiResolution( 16 )
  sphere.SetThetaResolution( 16 )
  
  # Create mappers
  mapper1 = vtkPolyDataMapper()
  mapper1.SetInput( arc.GetOutput() )
  
  mapper2 = vtkPolyDataMapper()
  mapper2.SetInputConnection( sphere.GetOutputPort() )
  
  # Create actors
  actor1 = vtkActor()
  actor1.SetMapper( mapper1 )
  actor1.GetProperty().SetColor( 1., 0., 0. )
  actor2 = vtkActor()
  actor2.SetMapper( mapper2 )
  
  # Create renderer
  renderer = vtkRenderer()
  renderer.AddViewProp( actor1 )
  renderer.AddViewProp( actor2 )
  renderer.SetBackground( .3, .4 ,.5 )
  
  # Create render window
  window = vtkRenderWindow()
  window.AddRenderer( renderer )
  window.SetSize( 500, 500 )
  
  # Create interactor
  interactor = vtkRenderWindowInteractor()
  interactor.SetRenderWindow( window )
  
  # Start interaction
  window.Render()
  interactor.Start()
  
subject: Add broken line example