new_contents: """
  Decimation
  ~~~~~~~~~~
  
  Decaimate a mesh
  
  """
  # sphinx_gallery_thumbnail_number = 1
  import vtki
  from vtki import examples
  
  mesh = examples.download_face()
  
  # Define a camera potion the shows this mesh properly
  cpos = [(0.4,-0.07,-0.31), (0.05,-0.13,-0.06), (-.1,1,0.08)]
  
  # Preview the mesh
  mesh.plot(cpos=cpos, show_edges=True, color=True)
  
  ###############################################################################
  #  Now let's define a target reduction and compare the
  # :func:`vtki.PolyData.decimate` and :func:`vtki.PolyData.decimate_pro` filters.
  target_reduction = 0.7
  print('Reducing {} percent out of the original mesh'.format(target_reduction * 100.))
  
  ###############################################################################
  decimated = mesh.decimate(target_reduction)
  
  decimated.plot(cpos=cpos, show_edges=True)
  
  
  ###############################################################################
  pro_decimated = mesh.decimate_pro(target_reduction, preserve_topology=True)
  
  pro_decimated.plot(cpos=cpos, show_edges=True, color=True)
  
subject: Add decimate example