如何用遮罩对象使对象的背面不可见？ （Swift，RealityKit，Reality Composer）

Question

我想在AR投影时隐藏对象的背面。您会看到，物体在墙上有点加深了。我可以制作某种遮罩对象以使该对象不可见吗？

import UIKit
import RealityKit

class ViewController: UIViewController {

    @IBOutlet var arView: ARView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Load the "Box" scene from the "Experience" Reality File
        let ARscene1 = try! Experience.load_1()
        let ARscene2 = try! Experience.load_2()
        let ARscene3 = try! Experience.load_3() //that scene, object named "mask"

        // Add the box anchor to the scene
        arView.scene.anchors.append(ARscene1)
        arView.scene.anchors.append(ARscene2)
        arView.scene.anchors.append(ARscene3)
    }
}

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