ARKit does not recognize reference images-CodePudding

I'm trying to place a 3D model on top of a recognized image with ARKit and RealityKit - all programmatically. Before I start the ARView I'm downloading the model I want to show when the reference image is detected.

This is my current setup:

override func viewDidLoad() {
    super.viewDidLoad()
    
    arView.session.delegate = self
    
    // Check if the device supports the AR experience
    if (!ARConfiguration.isSupported) {
        TLogger.shared.error_objc("Device does not support Augmented Reality")
        return
    }
    
    guard let qrCodeReferenceImage = UIImage(named: "QRCode") else { return }
    let detectionImages: Set<ARReferenceImage> = convertToReferenceImages([qrCodeReferenceImage])
    
    let configuration = ARWorldTrackingConfiguration()
    configuration.detectionImages = detectionImages
    
    arView.session.run(configuration, options: [.resetTracking, .removeExistingAnchors])
}

I use the ARSessionDelegate to get notified when a new image anchor was added which means the reference image got detected:

func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
    print("Hello")
    for anchor in anchors {
        guard let imageAnchor = anchor as? ARImageAnchor else { return }
        let referenceImage = imageAnchor.referenceImage
        
        addEntity(self.localModelPath!)
    }
}

However, the delegate method never gets called while other delegate functions like func session(ARSession, didUpdate: ARFrame) are getting called so I assume that the session just doesn't detect the image. The image resolution is good and the printed image the big so it should definitely get recognized by the ARSession. I also checked that the image has been found before adding it to the configuration.

Can anyone lead me in the right direction here?

CodePudding user response：

It looks like you have your configuration set up correctly. Your delegate-function should be called when the reference image is recognized. Could you check if there is any point in your code where the configuration is overwritten?