vtkOrientationMarkerWidget won't show in pyqt5

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I’m not sure if you still need to solve this problem, but I’ve found a solution in this post:

It seems that we both made a same mistake not to define the object ‘vtkOrientationMarkerWidget’ as a member of class ‘MainWindow’. Now my PyQt5 program can work normally.

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image1838×1002 11.8 KB

And here is my code:

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent = None):
        super().__init__()
        # create QVTKRenderWindowInteractor
        self.vtk_widget = QVTKRenderWindowInteractor(self)

        # create render and interactor
        self.renderer = vtk.vtkRenderer()
        self.vtk_widget.GetRenderWindow().AddRenderer(self.renderer)
        self.interactor = self.vtk_widget.GetRenderWindow().GetInteractor()

        # create an axes actor, remember to define it as a member variable
        self.axes_actor = vtkAxesActor()
        self.axes_actor.AxisLabelsOn()
        self.axes_actor.SetTotalLength(1.0, 1.0, 1.0)
        self.axes_actor.SetShaftTypeToCylinder()

        # create a vtkOrientationMarkerWidget, and connect it with axes actor. remember to define it as a member variable
        self.axes_widget = vtk.vtkOrientationMarkerWidget()
        self.axes_widget.SetOrientationMarker(self.axes_actor)
        self.axes_widget.SetInteractor(self.interactor)
        self.axes_widget.SetViewport(0.0, 0.0, 0.2, 0.2) 
        self.axes_widget.SetEnabled(True)
        self.axes_widget.InteractiveOn()

        # background color
        self.renderer.SetBackground(0.8, 0.8, 0.8)

        # model
        self.sphere = vtk.vtkSphereSource()
        self.sphere_mapper = vtk.vtkPolyDataMapper()
        self.sphere_mapper.SetInputConnection(self.sphere.GetOutputPort())
        self.sphere_actor = vtk.vtkActor()
        self.sphere_actor.SetMapper(self.sphere_mapper)
        self.renderer.AddActor(self.sphere_actor)

        # camera
        self.camera = self.renderer.GetActiveCamera()
        self.camera.SetPosition(0, 0, 30)
        self.renderer.SetActiveCamera(self.camera)

        self.setCentralWidget(self.vtk_widget)
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