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The code looks like this:But the printed identifier has not changed, is it always one? Is there anything I set up?override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) let configuration = ARFaceTrackingConfiguration() print(ARFaceTrackingConfiguration.supportedNumberOfTrackedFaces) configuration.maximumNumberOfTrackedFaces = 2 faceSCNView.session.run(configuration) }extension GameViewController : ARSCNViewDelegate { func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) { if anchor is ARFaceAnchor { print( anchor.identifier , anchor.name ?? "") } } func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) { guard let faceAnchor = anchor as? ARFaceAnchor else { return} print(faceAnchor.identifier , faceAnchor.blendShapes[.mouthClose] ?? 0) }}extension GameViewController : ARSessionDelegate { func session(_ session: ARSession, didAdd anchors: [ARAnchor]) { print(anchors.count) for anchor in anchors where anchor is ARFaceAnchor { let faceAnchor = anchor as! ARFaceAnchor print("Session AddAnchor", faceAnchor.identifier , faceAnchor.blendShapes[.mouthClose] ?? 0) } } func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) { for anchor in anchors where anchor is ARFaceAnchor { let faceAnchor = anchor as! ARFaceAnchor print("Session Update", faceAnchor.identifier , faceAnchor.blendShapes[.mouthClose] ?? 0) } }}