// _bboxMapper->ImmediateModeRenderingOn();
_pointVtkActor->SetMapper(_bboxMapper);
// _pointVtkActor->GetProperty()->BackfaceCullingOn();
// _bboxMapper->ImmediateModeRenderingOn();
_pointVtkActor->SetMapper(_bboxMapper);
// _pointVtkActor->GetProperty()->BackfaceCullingOn();