loadModel.swift

    func loadModel(named: String, result: ARRaycastResult) {
        
        var usdzToLoad: String = ""
        
        switch named {
        case "DYNO":
            usdzToLoad = "toy_robot_vintage.usdz"
        default:
            break;
        }
        
        DispatchQueue.main.async {
            let modelToLoad = try! ModelEntity.load(named: usdzToLoad)
            
            switch named {
            case "DYNO":
                modelToLoad.name = "DYNO"
            default:
                break;
            }
            
            let anchor = AnchorEntity(plane: .horizontal, classification: .any, minimumBounds: [0.1, 0.1])
                anchor.position.y = 0.01
                anchor.addChild(modelToLoad)
            
            // Create a "Physics" model of the toy in order to add physics mode
            guard let modelEntity = modelToLoad as? HasPhysics else { return }

            self.arView.installGestures([.rotation], for: modelEntity)
            
            modelEntity.generateCollisionShapes(recursive: true)
            modelEntity.physicsBody = PhysicsBodyComponent(shapes: [.generateBox(size: .one)],
                                                           mass: 1.0,
                                                           material: .default,
                                                           mode: .kinematic)

            self.currentEntity = modelEntity
            self.anchorsEntities.append(anchor)
            
            self.arView.scene.addAnchor(anchor)
            
            let robotAnimationResource = self.currentEntity?.availableAnimations.first
            
            self.currentEntity!.playAnimation(robotAnimationResource!.repeat(duration: .infinity),
                                             transitionDuration: 1.25,
                                                   startsPaused: false)
        }