new_contents: import vtk
  
  sphereSource = vtk.vtkSphereSource()
  sphereSource.Update()
  
  input_data = vtk.vtkPolyData()
  input_data.ShallowCopy(sphereSource.GetOutput())
  
  arrowSource = vtk.vtkArrowSource()
  
  glyph3D = vtk.vtkGlyph3D()
  glyph3D.SetSourceConnection(arrowSource.GetOutputPort())
  glyph3D.SetVectorModeToUseNormal()
  glyph3D.SetInputData(input_data)
  glyph3D.SetScaleFactor(.2)
  glyph3D.Update()
  
  # Visualize
  mapper = vtk.vtkPolyDataMapper()
  mapper.SetInputConnection(glyph3D.GetOutputPort())
  
  actor = vtk.vtkActor()
  actor.SetMapper(mapper)
  
  renderer = vtk.vtkRenderer()
  renderWindow = vtk.vtkRenderWindow()
  renderWindow.AddRenderer(renderer)
  renderWindowInteractor = vtk.vtkRenderWindowInteractor()
  renderWindowInteractor.SetRenderWindow(renderWindow)
  
  renderer.AddActor(actor)
  renderer.SetBackground(.3, .6, .3) # Background color green
  
  renderWindow.Render()
  renderWindowInteractor.Start()
  
  
subject: add Python/Visualisation/OrientedGlyphs