可以尝试使用 Apple 的 TrueDepth 相机进行 3D 人脸扫描。通过使用 ARKit 框架的 ARFaceTrackingConfiguration 配置来实现。

代码示例：

import ARKit

class ViewController: UIViewController, ARSessionDelegate {
    
    private var session: ARSession!
    private var sceneView: ARSCNView!
    private var faceNode = SCNNode()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        session = ARSession()
        session.delegate = self
        
        sceneView = ARSCNView(frame: view.frame)
        sceneView.session = session
        view.addSubview(sceneView)
        
        let configuration = ARFaceTrackingConfiguration()
        session.run(configuration, options: [.resetTracking, .removeExistingAnchors])
    }
    
    func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
        guard let faceAnchor = anchor as? ARFaceAnchor else { return }
        
        faceNode = createFaceGeometry()
        node.addChildNode(faceNode)
    }
    
    private func createFaceGeometry() -> SCNNode {
        let faceGeometry = ARSCNFaceGeometry(device: sceneView.device!)
        let faceNode = SCNNode(geometry: faceGeometry)
        faceNode.geometry?.firstMaterial?.colorBufferWriteMask = []
        return faceNode
    }
    
    func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
        guard let faceAnchor = anchors.first as? ARFaceAnchor else { return }
        let faceGeometry = faceNode.geometry as? ARSCNFaceGeometry
        faceGeometry?.update(from: faceAnchor.geometry)
    }
    
}

这个示例利用了 ARFaceTrackingConfiguration 的 ARSCNFaceGeometry，它允许将许多点连接起来以创建面部相似物形状。

但需要注意的是，这个示例仅仅是演示如何使用 ARKit 完成类似 Bellus3D 的 3D 扫描