The following code creates polygons from point and adds polygons. I eventually write this appended data to a vtk file. I want to color these polygons to a specific RGB color so that when I load the vtk file in Paraview glance, I can see the colors instead of solid colors. I have checked several examples on and I learned that the way to assign colors is to use a lookuptable and a mapper. Now the question is, Can I write a mapper to a vtk file or I should not think about mappers at all in this case?
def create_polygon(points): """Create a vtk Polygon from a list of points. The point will have to be in an order. This function cannot be used to create a polygon with holes. Args: points: A list of points. Here, each point is a list of X, Y, and Z cordinate. Returns: A tuple with two elements. - vtk_points: A list of vtk point objects - vtk_polygon: A vtk polygon object created from the points provided. """ vtk_points = vtk.vtkPoints() vtk_polygon = vtk.vtkPolygon() vtk_polygon.GetPointIds().SetNumberOfIds(len(points)) for point in points: vtk_points.InsertNextPoint(tuple(point)) for i in range(len(points)): vtk_polygon.GetPointIds().SetId(i, i) return vtk_points, vtk_polygon def create_polygons(points_lst): """Create a vtk object with multiple vtk polygons. Args: points_lst: A list of lists of points. Here, each point is a list of X, Y, and Z cordinate. Returns: A vtk object that has multiple vtk polygons. """ vtk_polydata_lst =  for i in range(len(points_lst)): # Create a list of vtk polydata objects with polygons vtk_points, vtk_polygon = create_polygon(points_lst[i]) vtk_polygons = vtk.vtkCellArray() vtk_polygons.InsertNextCell(vtk_polygon) vtk_polydata = vtk.vtkPolyData() vtk_polydata.SetPoints(vtk_points) vtk_polydata.SetPolys(vtk_polygons) vtk_polydata.Modified() vtk_polydata_lst.append(vtk_polydata) # Create a vtk object with multiple polygons vtk_polydata_extended = vtk.vtkAppendPolyData() for i in range(len(vtk_polydata_lst)): vtk_polydata_extended.AddInputData(vtk_polydata_lst[i]) vtk_polydata_extended.Update() return vtk_polydata_extended