Qt3D中的QObjectPicker和设置点拾取不起作用

我想使用点选择器在点云中拾取(获取)我的点的坐标。这就是为什么我要设置 QPickingSettings 到 PointPicking 但这似乎无法做到。发送到方法的事件 mouse_event 属于类型 QPickEvent 而不是 QPickPointEvent .我做错了什么?

self.picker = Qt3DRender.QObjectPicker(self)
picking_settings = Qt3DRender.QPickingSettings(self.picker)
picking_settings.setFaceOrientationPickingMode(
    Qt3DRender.QPickingSettings.FrontAndBackFace)  
# set QObjectPicker to PointPicking:
picking_settings.setPickMethod(
    Qt3DRender.QPickingSettings.PointPicking)
picking_settings.setPickResultMode(
    Qt3DRender.QPickingSettings.NearestPick)
picking_settings.setWorldSpaceTolerance(.5)

self.picker.setHoverEnabled(True)
self.picker.setDragEnabled(True)

def mouse_event(e):
    # do something
    # e should be QPickPointEvent type
    pass

self.picker.moved.connect(mouse_event)
self.picker.pressed.connect(mouse_event)
self.picker.clicked.connect(mouse_event)
self.picker.released.connect(mouse_event)
self.addComponent(self.picker)