old_contents: #!/usr/bin/env python
  import vtk
  
  def main():
      # Create a graph
      graph = vtk.vtkMutableDirectedGraph()
      
      v1 = graph.AddVertex()
      v2 = graph.AddVertex()
      v3 = graph.AddVertex()
      graph.AddEdge(v1,v2)
      graph.AddEdge(v2,v3)
      
      # Manually set the position of the vertices
      points = vtk.vtkPoints()
      points.InsertNextPoint(0,0,0)
      points.InsertNextPoint(1,0,0)
      points.InsertNextPoint(2,0,0)
      
      graph.SetPoints(points)
      
      # Create the color array
      vertexColors = vtk.vtkIntArray()
      vertexColors.SetNumberOfComponents(1)
      vertexColors.SetName("Color")
      
      lookupTable = vtk.vtkLookupTable()
      lookupTable.SetNumberOfTableValues(3)
      lookupTable.SetTableValue(0, 1.0, 0.0, 0.0) # red
      lookupTable.SetTableValue(1, 1.0, 1.0, 1.0) # white
      lookupTable.SetTableValue(2, 0.0, 1.0, 0.0) # green
      lookupTable.Build()
      
      vertexColors.InsertNextValue(0)
      vertexColors.InsertNextValue(1)
      vertexColors.InsertNextValue(2)
      
      # Add the color array to the graph
      graph.GetVertexData().AddArray(vertexColors)
      
      # Visualize
      graphLayoutView = vtk.vtkGraphLayoutView()
      graphLayoutView.AddRepresentationFromInput(graph)
      graphLayoutView.SetLayoutStrategyToPassThrough()
      graphLayoutView.SetVertexColorArrayName("Color")
      graphLayoutView.ColorVerticesOn()
      
      theme = vtk.vtkViewTheme()
      theme.SetPointLookupTable(lookupTable)
      
      graphLayoutView.ApplyViewTheme(theme)
      graphLayoutView.ResetCamera()
      graphLayoutView.GetInteractor().Initialize()
      graphLayoutView.GetRenderer().GetActiveCamera().Zoom(0.8)
      graphLayoutView.GetInteractor().Start()
  
  if __name__ == '__main__':
      main()
  
new_contents: #!/usr/bin/env python
  
  import vtk
  
  def main():
      # Create a graph
      graph = vtk.vtkMutableDirectedGraph()
      
      v1 = graph.AddVertex()
      v2 = graph.AddVertex()
      v3 = graph.AddVertex()
      graph.AddEdge(v1,v2)
      graph.AddEdge(v2,v3)
      
      # Manually set the position of the vertices
      points = vtk.vtkPoints()
      points.InsertNextPoint(0,0,0)
      points.InsertNextPoint(1,0,0)
      points.InsertNextPoint(2,0,0)
      
      graph.SetPoints(points)
      
      # Create the color array
      vertexColors = vtk.vtkIntArray()
      vertexColors.SetNumberOfComponents(1)
      vertexColors.SetName("Color")
      
      lookupTable = vtk.vtkLookupTable()
      lookupTable.SetNumberOfTableValues(3)
      lookupTable.SetTableValue(0, 1.0, 0.0, 0.0) # red
      lookupTable.SetTableValue(1, 1.0, 1.0, 1.0) # white
      lookupTable.SetTableValue(2, 0.0, 1.0, 0.0) # green
      lookupTable.Build()
      
      vertexColors.InsertNextValue(0)
      vertexColors.InsertNextValue(1)
      vertexColors.InsertNextValue(2)
      
      # Add the color array to the graph
      graph.GetVertexData().AddArray(vertexColors)
      
      # Visualize
      graphLayoutView = vtk.vtkGraphLayoutView()
      graphLayoutView.AddRepresentationFromInput(graph)
      graphLayoutView.SetLayoutStrategyToPassThrough()
      graphLayoutView.SetVertexColorArrayName("Color")
      graphLayoutView.ColorVerticesOn()
      
      theme = vtk.vtkViewTheme()
      theme.SetPointLookupTable(lookupTable)
      
      graphLayoutView.ApplyViewTheme(theme)
      graphLayoutView.ResetCamera()
      graphLayoutView.GetInteractor().Initialize()
      graphLayoutView.GetRenderer().GetActiveCamera().Zoom(0.8)
      graphLayoutView.GetInteractor().Start()
  
  if __name__ == '__main__':
      main()
  
subject: Update ColorVerticesLookupTable.py