简单的python和vtk代码不起作用。为什么？

Question

我不得不说我是Python的新手，尤其是vtk（8.1.1）。我正在使用PyCharm，并添加了vtk解释器。

我编写了这段代码以显示带有vtk的简单多维数据集，但是它唯一要做的就是打开一个黑色的窗口，里面没有任何东西。

from vtk import *
# Generate polygon data for a cube
cube = vtk.vtkCubeSource()
# Create a mapper for the cube data
cube_mapper = vtk.vtkPolyDataMapper()
cube_mapper.SetInputData(cube.GetOutput())
# Connect the mapper to an actor
cube_actor = vtk.vtkActor()
cube_actor.SetMapper(cube_mapper)
cube_actor.GetProperty().SetColor(1.0, 0.0, 0.0)
# Create a renderer and add the cube actor to it
renderer = vtk.vtkRenderer()
renderer.SetBackground(0.0, 0.0, 0.0)
renderer.AddActor(cube_actor)
# Create a render window
render_window = vtk.vtkRenderWindow()
render_window.SetWindowName("Simple VTK scene")
render_window.SetSize(400, 400)
render_window.AddRenderer(renderer)
# Create an interactor
interactor = vtk.vtkRenderWindowInteractor()
interactor.SetRenderWindow(render_window)
# Initialize the interactor and start the
# rendering loop
interactor.Initialize()
render_window.Render()
interactor.Start()

我在哪里错了？

感谢您的帮助，

Davide

Answer 1

您应先调用 cube.Update（），然后再调用 cube.GetOutput（）

from vtk import *
# Generate polygon data for a cube
cube = vtk.vtkCubeSource()
cube.Update()

# Create a mapper for the cube data
cube_mapper = vtk.vtkPolyDataMapper()
cube_mapper.SetInputData(cube.GetOutput())
# Connect the mapper to an actor
cube_actor = vtk.vtkActor()
cube_actor.SetMapper(cube_mapper)
cube_actor.GetProperty().SetColor(1.0, 0.0, 0.0)
# Create a renderer and add the cube actor to it
renderer = vtk.vtkRenderer()
renderer.SetBackground(0.0, 0.0, 0.0)
renderer.AddActor(cube_actor)
# Create a render window
render_window = vtk.vtkRenderWindow()
render_window.SetWindowName("Simple VTK scene")
render_window.SetSize(400, 400)
render_window.AddRenderer(renderer)
# Create an interactor
interactor = vtk.vtkRenderWindowInteractor()
interactor.SetRenderWindow(render_window)
# Initialize the interactor and start the
# rendering loop
interactor.Initialize()
render_window.Render()
interactor.Start()