print "nodded" when person nods using arkit's arfaceanchor in swift

You can achieve this print statement by detecting a nodding motion from ARFaceAnchor's blendShapes parameter. ARFaceAnchor is an anchor that ARKit uses to track the position and orientation of a user's face in the AR scene. The blendShapes parameter provides information about various facial expressions, including nodding.

Here's how you can print "nodded" when person nods using ARKit's ARFaceAnchor in Swift:

  1. First, you need to create an ARSCNView and add it to your view controller's view:
main.swift
import ARKit

class ViewController: UIViewController, ARSCNViewDelegate {

    @IBOutlet weak var sceneView: ARSCNView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Set the view's delegate
        sceneView.delegate = self

        // Show statistics such as fps and timing information
        sceneView.showsStatistics = true
    }

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

        // Create a session configuration
        let configuration = ARFaceTrackingConfiguration()

        // 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()
    }
}

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  1. Next, you need to implement the ARSCNViewDelegate method renderer(_:didUpdate:for:):
main.swift
func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
    guard let faceAnchor = anchor as? ARFaceAnchor else { return }

    // Check if the nodding motion is detected
    if let nod = faceAnchor.blendShapes[.jawOpen]?.floatValue, nod > 0.5 {
        print("nodded")
    }
}

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This method gets called every time a new frame is rendered for ARSCNView. You can access ARFaceAnchor from the ARAnchor parameter, and then you can check the blendShapes parameter to detect nodding motion. In this case, we're checking the .jawOpen blend shape, which represents how open the user's mouth is. If it's greater than 0.5, then we can assume that the user is nodding.

That's it! Now you should see "nodded" printed in the console every time the user nods.

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related categories

arkit
swift
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