 import SceneKit
 import ARKit
 
-class ViewController: UIViewController, ARSCNViewDelegate {
+class ViewController: UIViewController {
 
     @IBOutlet var sceneView: ARSCNView!
     

    }
}

extension ViewController : SCNPhysicsContactDelegate {
    
    func physicsWorld(_ world: SCNPhysicsWorld, didBegin contact: SCNPhysicsContact) {

    }
}

struct CollisionTypes : OptionSet {
    let rawValue: Int
    
