如何使用vtk库更改STL颜色

import vtk

reader = vtk.vtkSTLReader()
reader.SetFileName("path/to/stl/file.stl")
reader.Update()

colorMapper = vtk.vtkColorTransferFunction()
colorMapper.AddRGBPoint(0, 1, 0, 0)  # 设置颜色映射器的起始颜色为红色
colorMapper.AddRGBPoint(1, 0, 0, 1)  # 设置颜色映射器的结束颜色为蓝色

renderer = vtk.vtkRenderer()
actor = vtk.vtkActor()
actor.SetMapper(reader.GetOutputPort())
actor.GetProperty().SetColor(0, 1, 0)  # 设置演员的颜色为绿色
actor.GetProperty().SetOpacity(1)  # 设置演员的不透明度为1
actor.GetProperty().SetScalarOpacityUnitDistance(0.1)  # 设置演员的颜色映射器单位距离
actor.GetProperty().SetLookupTable(colorMapper)  # 将颜色映射器应用于演员

renderWindow = vtk.vtkRenderWindow()
renderWindow.AddRenderer(renderer)

interactor = vtk.vtkRenderWindowInteractor()
interactor.SetRenderWindow(renderWindow)

style = vtk.vtkInteractorStyleTrackballCamera()
interactor.SetInteractorStyle(style)

renderWindow.Render()
interactor.Start()