Remove the focus point when the camera sees ARImageAnchor and reveal the focus point when the camera does not see ARImageAnchor

Question

Created Sep ’21

Replies 2

Boosts 0

Views 1k

Participants 3

I try to obtain focus point entity when camera not see ARImageAnchor, and remove after camera sees ARImageAnchor, and when camera not sees anchor obtain focus point again. I used arView.session.delegate, but delegate method maybe call one time, i don't know. how to make it? Thank u

  
  var focusEntity: FocusEntity! // (FocusEntity: Entity, HasAnchoring) 
 
  override func viewDidLoad() {
        super.viewDidLoad()
        // ...
        focusEntity = FocusEntity(on: arView, style: .classic(color: .systemGray4))
        arView.session.delegate = self
    }
}
 
 
extension CameraViewController: ARSessionDelegate {
    func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
        for anchor in anchors {
            if let imageAnchor = anchor as? ARImageAnchor {
                focusEntity.destroy()
                focusEntity = nil
 
                //... Obtain entity to image anchor
            }
        }
    }
 
    func session(_ session: ARSession, didUpdate frame: ARFrame) {
        //... ???
    }
}

Boost

Answer 1

multitudes OP

Nov ’21

Funny that I have the same question, tried everything and cannot get the focusEntity away :)

0

Answer 2

Vision Pro Engineer OP

Apple

Nov ’21

You can show and hide a RealityKit entity with the isEnabled property. To make this dependent on the anchor's visibility, you can use its isTracked property.

0


	var focusEntity: FocusEntity! // (FocusEntity: Entity, HasAnchoring)

	override func viewDidLoad() {
	super.viewDidLoad()
	// ...
	focusEntity = FocusEntity(on: arView, style: .classic(color: .systemGray4))
	arView.session.delegate = self
	}
	}


	extension CameraViewController: ARSessionDelegate {
	func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
	for anchor in anchors {
	if let imageAnchor = anchor as? ARImageAnchor {
	focusEntity.destroy()
	focusEntity = nil

	//... Obtain entity to image anchor
	}
	}
	}

	func session(_ session: ARSession, didUpdate frame: ARFrame) {
	//... ???
	}
	}