I have an app which detects a few images and do some effects (mostly play a video inside the image) as long as the func renderer is triggered when a Image is detected, is there any func that is triggered when no Image is detected?
When no image is detected I would like to stop the video playing. Thanks!
If you have a look at the documentation you will see that an ARImageAnchor conforms to the ARTrackable Protocol which:
is adopted by ARKit classes, such as the ARFaceAnchor class, that represent moving objects in a scene.
ARSCNView and ARSKView automatically hide the nodes for anchors whose isTracked property is false.
ARKit automatically manages representations of such objects in an active AR session, ensuring that changes in the real-world object's position and orientation (the transform property for anchors) are reflected in corresponding ARKit objects. The isTracked property indicates whether the current transform is valid with respect to movement of the real-world object.
As such you can detect if your ARImageAnchor is currently being tracked using something like this as a starter:
//--------------------------
//MARK: - ARSessionDelegate
//--------------------------
extension ViewController: ARSessionDelegate{
func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
//1. Enumerate Our Anchors To See If We Have Found Our Target Anchor
for anchor in anchors{
if let imageAnchor = anchor as? ARImageAnchor, imageAnchor == videoAnchor{
//2. If The ImageAnchor Is No Longer Tracked Then Handle The Event
if !imageAnchor.isTracked{
}else{
}
}
}
}
}
Whereby videoAnchor is simply an ARImageAnchor I have stored reference to as a Global Variable.
Alternatively you if you want to cancel an operation when a particular SCNNode is outside of the Frostrum of the camera you can do something like so:
/// Stops All VideoPlayers Outside Of Frostrum
///
/// - Parameter currentVideoNode: SCNNode
func stopAllVideoPlayersOutsideOfPointOfView(){
//a. Get The Current Point Of You & Our SCNScene
guard let currentPointOfView = self.augmentedRealityView?.pointOfView,
let scnView = self.augmentedRealityView else { return }
//b. Loop Through All The Hierachy
if let childNodes = self.augmentedRealityView?.scene.rootNode.childNodes{
childNodes.forEach { (node) in
//c. If Our Node Isn't In View Of The Camera Then Stop The Video
if !scnView.isNode(node, insideFrustumOf: currentPointOfView){
}
}
}
}
Hope it helps...
