如何用vtk在python中绘制鼠标可旋转点云

我需要用python绘制可旋转点云，以下是我在网上发现的：

import vtk_visualizer as vv
import numpy as np
xyz = np.random.rand(1000, 3)
vtkControl = vv.VTKVisualizerControl()
vtkControl.AddPointCloudActor(xyz)
vtkControl.Render()
vtkControl.ResetCamera()

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它显示窗口一会儿，但窗口隐藏了，所以我不能用鼠标旋转它。我怎样才能修好它

这是我找到的解决方案：

import vtk_visualizer as vv
import numpy as np
import sys
from PyQt5.QtWidgets import *
xyz = np.random.rand(1000, 3)
vtkControl = vv.VTKVisualizerControl()
vtkControl.AddPointCloudActor(xyz)
app = QApplication.instance()
if app is None:
    app = QApplication(sys.argv)
app.exec_()