How to attach 3D object to screen?

Question

How can I make a 3D object to be attached to my phone, so I can move around, and then after I click on the screen - the 3D object should remain in the current position in 3D space?

Answer 1

Native RealityKit approach

@Rumata, here's how your code might look like for stick-and-drop methodology. A sphere object will be automatically dropped in 5 seconds after app's launch. The same way you can implement Tap Gesture (via Storyboard or programmatically, it's up to you).

import ARKit
import RealityKit

class ViewController: UIViewController {
    
    @IBOutlet var arView: ARView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let mesh = MeshResource.generateSphere(radius: 0.1)
        let sphere = ModelEntity(mesh: mesh)
        sphere.transform.translation = [0, 0,-1]

        let anchor = AnchorEntity(.camera)
        sphere.setParent(anchor)
        arView.scene.addAnchor(anchor)
                
        DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
            
            let frame = self.arView.session.currentFrame
            let envAnchor = AnchorEntity(world: (frame?.camera.transform)!)
            
            sphere.removeFromParent()
            envAnchor.addChild(sphere)

            self.arView.scene.addAnchor(envAnchor)
        }
    }
}