How adjust project to track multiple objects?

[albertoleon7794]

How can I adjust this project to start tracking more than one object?
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class ViewController: UIViewController, ARSCNViewDelegate {

@IBOutlet var sceneView: ARSCNView!
@IBOutlet var sceneView2: ARSCNView!

override func viewDidLoad() {
    super.viewDidLoad()
    
    // Set the view's delegate
    sceneView.delegate = self

    
    // Show statistics such as fps and timing information
    sceneView.showsStatistics = false
    
    // Create a new scene
    let scene = SCNScene(named: "art.scnassets/GameScene.scn")!

    
    // Set the scene to the view
    sceneView.scene = scene
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    
    // Create a session configuration
    let configuration = ARWorldTrackingConfiguration()
    let configuration2 = ARWorldTrackingConfiguration()

    
    // Object Detection
    configuration.detectionObjects = ARReferenceObject.referenceObjects(inGroupNamed: "CentroObjects", bundle: Bundle.main)!
    
    // Object Detection
    configuration2.detectionObjects = ARReferenceObject.referenceObjects(inGroupNamed: "SofaObjects", bundle: Bundle.main)!

    // Run the view's session
    sceneView.session.run(configuration)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    
    // Pause the view's session
    sceneView.session.pause()
}

// MARK: - ARSCNViewDelegate

func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
    
    let node = SCNNode()
    let node2 = SCNNode()

    
    if let objectAnchor = anchor as? ARObjectAnchor {
        
        let plane = SCNPlane(width: CGFloat(objectAnchor.referenceObject.extent.x * 0.6), height: CGFloat(objectAnchor.referenceObject.extent.y * 0.5))
        
        plane.cornerRadius = plane.width / 8
        
        let spriteKitScene = SKScene(fileNamed: "ProductInfo_2")
        
        plane.firstMaterial?.diffuse.contents = spriteKitScene
        plane.firstMaterial?.isDoubleSided = true
        plane.firstMaterial?.diffuse.contentsTransform = SCNMatrix4Translate(SCNMatrix4MakeScale(1, -1, 1), 0, 1, 0)
        
        let planeNode = SCNNode(geometry: plane)
        planeNode.position = SCNVector3Make(objectAnchor.referenceObject.center.x, objectAnchor.referenceObject.center.y + 0.70, objectAnchor.referenceObject.center.z)
        
        node.addChildNode(planeNode)
        
    }
    
    if let objectAnchor2 = anchor as? ARObjectAnchor {

        let plane2 = SCNPlane(width: CGFloat(objectAnchor2.referenceObject.extent.x * 0.6), height: CGFloat(objectAnchor2.referenceObject.extent.y * 0.5))

        plane2.cornerRadius = plane2.width / 8

        let spriteKitScene2 = SKScene(fileNamed: "sofacama")

        plane2.firstMaterial?.diffuse.contents = spriteKitScene2
        plane2.firstMaterial?.isDoubleSided = true
        plane2.firstMaterial?.diffuse.contentsTransform = SCNMatrix4Translate(SCNMatrix4MakeScale(1, -1, 1), 0, 1, 0)

        let planeNode2 = SCNNode(geometry: plane2)
        planeNode2.position = SCNVector3Make(objectAnchor2.referenceObject.center.x, objectAnchor2.referenceObject.center.y + 0.70, objectAnchor2.referenceObject.center.z)

        node.addChildNode(<#T##child: SCNNode##SCNNode#>)
    }
    
    
    return node
}


func session(_ session: ARSession, didFailWithError error: Error) {
    // Present an error message to the user
    
}

func sessionWasInterrupted(_ session: ARSession) {
    // Inform the user that the session has been interrupted, for example, by presenting an overlay
    
}

func sessionInterruptionEnded(_ session: ARSession) {
    // Reset tracking and/or remove existing anchors if consistent tracking is required
    
}

}
`
I've tried to add multiple anchors but when I add it to the node it only loads the last one.