如何在FaceTracking的iOS中使用ARKit应用眼球旋转

import ARKit

class ViewController: UIViewController, ARSessionDelegate {
    var arView: ARSCNView!
    var eyeNode: SCNNode!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建AR视图
        arView = ARSCNView(frame: view.bounds)
        view.addSubview(arView)
        
        // 创建AR会话
        let arSession = ARSession()
        arSession.delegate = self
        
        // 配置追踪
        let configuration = ARFaceTrackingConfiguration()
        arSession.run(configuration)
        
        // 添加眼球节点
        let eyeGeometry = SCNSphere(radius: 0.02)
        eyeNode = SCNNode(geometry: eyeGeometry)
        arView.scene.rootNode.addChildNode(eyeNode)
    }
    
    func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
        // 获取面部追踪数据
        guard let faceAnchor = anchors.first as? ARFaceAnchor else { return }
        
        // 获取眼睛的旋转信息
        let leftEyeTransform = faceAnchor.leftEyeTransform
        let rightEyeTransform = faceAnchor.rightEyeTransform
        
        // 根据旋转信息更新眼球节点的位置和旋转
        eyeNode.simdTransform = leftEyeTransform
        // 或者使用以下代码更新眼球节点的位置和旋转
        // eyeNode.simdTransform = rightEyeTransform
    }
}