https://stackoverflow.com/questions/57582930/why-does-arface

import UIKit
import SceneKit
import ARKit

class ViewController: UIViewController {

    @IBOutlet var sceneView: ARSCNView!

    override func viewDidLoad() {
        super.viewDidLoad()

        sceneView.debugOptions = [.showWorldOrigin]
        sceneView.scene = SCNScene()

        let configuration = ARFaceTrackingConfiguration()
        configuration.worldAlignment = .camera

        sceneView.session.run(configuration)
    }
}