closeCube.swift

    @objc func goToMenu() {
        
        if self.timerStarted == true {
            self.idleTimer.invalidate()
            self.timerStarted = false
        }
        
        self.ck3dCube.camera.stop()
        
        self.scene.rootNode.enumerateChildNodes { (node, stop) in
            
            node.geometry?.firstMaterial?.normal.contents = nil
            node.geometry?.firstMaterial?.diffuse.contents = nil
            node.geometry?.firstMaterial?.ambientOcclusion.contents = nil
            node.geometry?.firstMaterial?.roughness.contents = nil
            node.geometry?.firstMaterial?.metalness.contents = nil
            node.geometry?.firstMaterial?.ambient.contents = nil
            
            node.geometry?.materials.removeAll()
            
            node.removeFromParentNode()
            node.cleanup()
        }
        
        self.scene.rootNode.cleanup()
        self.ck3dView.scene?.rootNode.cleanup()
        
        self.ck3dCube.stop()
        self.ck3dCube = nil
        self.ck3dView.antialiasingMode = .none
        self.ck3dView.scene = nil
        self.ck3dView.removeFromSuperview()
        self.ck3dView.stop(nil)
        self.ck3dView = nil
        self.scene = nil
        
        let viewController = ViewController()
            viewController.self.modalPresentationStyle = .fullScreen
            viewController.self.modalTransitionStyle = .crossDissolve
            viewController.transitioningDelegate = self as? UIViewControllerTransitioningDelegate
        
        self.present(viewController, animated: true, completion: nil)
        
    }