如何在Swift中使用RealityKit跟踪多个图像？

import RealityKit
import ARKit

let arView = ARView(frame: .zero)
let arConfig = ARWorldTrackingConfiguration()

if let referenceImages = ARReferenceImage.referenceImages(inGroupNamed: "ARImages", bundle: nil) {
    arConfig.detectionImages = referenceImages
}

let arSession = ARSession()
arSession.run(arConfig)
arView.session = arSession

func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
    if let imageAnchor = anchor as? ARImageAnchor {
        let imageNode = createImageNode()
        node.addChildNode(imageNode)
    }
}

func createImageNode() -> SCNNode {
    let box = SCNBox(width: 0.1, height: 0.1, length: 0.1, chamferRadius: 0)
    let material = SCNMaterial()
    material.diffuse.contents = UIColor.red
    box.materials = [material]
    let boxNode = SCNNode(geometry: box)
    return boxNode
}