addCubeToSceneView

 // on Tap to reposition the cube
    @objc func addCubeToSceneView(withGestureRecognizer recognizer: UIGestureRecognizer) {
        let tapLocation = recognizer.location(in: sceneView)
        switch recognizer.state {
        case .began:
            print("Object began to move")
            let hitResults = self.sceneView.hitTest(tapLocation, options: nil)
            if hitResults.isEmpty { return }
            let hitResult = hitResults.first
            if let node = hitResult?.node.parent?.parent?.parent {
                self.object = node
            }
        case .changed:
            print("Moving object position changed")
            
        case .ended:
            print("Done moving object")
            let hitTestResults = sceneView.hitTest(tapLocation, types: .existingPlaneUsingExtent)
            guard let hitTestResult = hitTestResults.first else {
                DispatchQueue.main.async {
                     showTost(withMessage:AppConstant.Message.addFailure_on_surface ,fromViewController:self)
                }
                return }
            planeNode.removeFromParentNode()
            planeAnchorNode.removeFromParentNode()
            shadowNode.removeFromParentNode()
            
            let translation = hitTestResult.worldTransform.translation
            let x = translation.x
            let y = translation.y
            let z = translation.z
            object.position = SCNVector3(x,y,z)
            sceneView.scene.rootNode.addChildNode(object)
            shadowNode = shadowPlane()
            shadowNode.position = SCNVector3(x,y - 0.1,z)
            sceneView.scene.rootNode.addChildNode(shadowNode)
        default:
            break
        }
    }