ARFace.swift

func updateFeatures(for node: SCNNode, using anchor: ARFaceAnchor) {
    for (feature, indices) in zip(features, featureIndices) {
        let child = node.childNode(withName: feature, recursively: false) as? EmojiNode
        let vertices = indices.map { anchor.geometry.vertices[$0] }
        child?.updatePosition(for: vertices)

        switch feature {
        case "leftEye":
            let scaleX = child?.scale.x ?? 1.0
            let eyeBlinkValue = anchor.blendShapes[.eyeBlinkLeft]?.floatValue ?? 0.0
            child?.scale = SCNVector3(scaleX, 1.0 - eyeBlinkValue, 1.0)

            let eyeLookDL = anchor.blendShapes[.eyeLookDownLeft]?.floatValue ?? 0.0
            if (eyeLookDL > 0.4) {
                let messageVC = UIAlertController(title: "eye look down left", message: "Account Created successfully" , preferredStyle: .actionSheet)
                present(messageVC, animated: true) {
                    Timer.scheduledTimer(withTimeInterval: 0.5, repeats: false, block: { (_) in
                        messageVC.dismiss(animated: true, completion: nil)})}
            }
        default:
            break
        }
    }
}