ARKit 2.0 ARImageTrackingConfiguration图片跟踪错误？

Question

在我看来，ARKit 2.0提供的跟踪不是很准确。当用SCNPlane覆盖跟踪图像时，SCNPlane总是重叠或下冲。我用不同的图像和不同的源代码示例测试了图像跟踪。不推荐使用的ARToolKit可以更精确地跟踪。

iPhone 7，IOS 12.0。

源代码是典型的：

import UIKit
import SceneKit
import ARKit

class ViewController: UIViewController, ARSCNViewDelegate {

    @IBOutlet var sceneView: ARSCNView!

    var session: ARSession {
        return sceneView.session
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        sceneView.delegate = self
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        let configuration = ARImageTrackingConfiguration()
        guard let trackingImages = ARReferenceImage.referenceImages(inGroupNamed: "AR Resources", bundle: nil) else {
            print("Could not load images")
            return
        }
        configuration.trackingImages = trackingImages
        configuration.maximumNumberOfTrackedImages = 1
        session.run(configuration, options: [])
    }

    public func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
        let node = SCNNode()
        if let imageAnchor = anchor as? ARImageAnchor {
            let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
            if imageAnchor.referenceImage.name == "test" {
                plane.firstMaterial?.diffuse.contents = UIColor.red
                plane.firstMaterial?.transparency = 0.5
            }
            let planeNode = SCNNode(geometry: plane)
            planeNode.eulerAngles.x = -.pi / 2
            node.addChildNode(planeNode)
        }
        return node
    }
}

有任何意见或建议吗？