vtkBoxWidget不与PyQt5应用程序一起工作

Question

我正在尝试使用QVTKRenderWindowInteractor在PyQt5中嵌入vtk渲染代码。当我试图在它里面使用vtkBoxWidget时，程序崩溃了。如果没有vtkBoxWidget（在下面的代码中包含在两行内），它的工作状态很好。你能帮我找到问题吗？我试图在vtkBoxWidget的帮助下使用边界框手动裁剪渲染对象

代码：

from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow, QFrame, QVBoxLayout
import sys
import vtk
from PyQt5 import QtGui
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor

class MainWindow(QMainWindow):

    def __init__(self, parent=None):
        QMainWindow.__init__(self, parent)
        self.frame = QFrame()
        self.vl = QVBoxLayout()
        self.vtkWidget = QVTKRenderWindowInteractor(self.frame)
        self.vl.addWidget(self.vtkWidget)

        self.ren = vtk.vtkRenderer()
        self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)
        self.iren = self.vtkWidget.GetRenderWindow().GetInteractor()
        self.iren.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())

        # Create source
        source = vtk.vtkSphereSource()
        source.SetCenter(0, 0, 0)
        source.SetRadius(5.0)

        # Create a mapper
        mapper = vtk.vtkPolyDataMapper()
        mapper.SetInputConnection(source.GetOutputPort())

        # Create an actor
        actor = vtk.vtkActor()
        actor.SetMapper(mapper)

        ###################################################################################
        boxWidget = vtk.vtkBoxWidget()
        boxWidget.SetInteractor(self.iren)
        boxWidget.SetPlaceFactor(1.0)
        boxWidget.SetRotationEnabled(0)
        planes = vtk.vtkPlanes()

        def ClipVolumeRender(obj, event):
            obj.GetPlanes(planes)
            mapper.SetClippingPlanes(planes)

        boxWidget.SetProp3D(actor)
        boxWidget.PlaceWidget()
        boxWidget.InsideOutOn()
        boxWidget.AddObserver("InteractionEvent", ClipVolumeRender)
        boxWidget.On()
        ###################################################################################

        self.ren.AddActor(actor)
        self.ren.ResetCamera()
        self.frame.setLayout(self.vl)
        self.setCentralWidget(self.frame)
        self.show()
        self.iren.Initialize()


if __name__ == "__main__":

    app = QApplication(sys.argv)
    window = MainWindow()
    sys.exit(app.exec_())

Answer 1

问题在于boxWidget是一个局部变量，python消除了它，因此应用程序随后尝试访问该对象，但它不再分配内存，从而生成分段错误。解决方案是通过将boxWidget更改为self.boxWidget来扩展范围