Place / Spawn only one object ARCore Tutorial and Code

Place / Spawn only one object ARCore Tutorial and Code

How to modify the standard HelloARcontroller script to instantiate one time?

Code : 
The following code allows only one prefab to instantiate in the scene. Multiple touches will not give multiple andy prefabs only one will be placed. Comment if you have any queries

	namespace GoogleARCore.Examples.HelloAR
	{
	using System.Collections.Generic;
	using GoogleARCore;
	using GoogleARCore.Examples.Common;
	using UnityEngine;
	using UnityEngine.EventSystems;
	#if UNITY_EDITOR
	// Set up touch input propagation while using Instant Preview in the editor.
	using Input = InstantPreviewInput;
	#endif
	/// <summary>
	/// Controls the HelloAR example.
	/// </summary>
	public class HelloARController : MonoBehaviour
	{
	/// <summary>
	/// The first-person camera being used to render the passthrough camera image (i.e. AR
	/// background).
	/// </summary>
	public Camera FirstPersonCamera;
	/// <summary>
	/// A prefab to place when a raycast from a user touch hits a vertical plane.
	/// </summary>
	public GameObject GameObjectVerticalPlanePrefab;
	/// <summary>
	/// A prefab to place when a raycast from a user touch hits a horizontal plane.
	/// </summary>
	public GameObject GameObjectHorizontalPlanePrefab;
	bool spawned;
	/// <summary>
	/// A prefab to place when a raycast from a user touch hits a feature point.
	/// </summary>
	public GameObject GameObjectPointPrefab;
	/// <summary>
	/// The rotation in degrees need to apply to prefab when it is placed.
	/// </summary>
	private const float k_PrefabRotation = 180.0f;
	/// <summary>
	/// True if the app is in the process of quitting due to an ARCore connection error,
	/// otherwise false.
	/// </summary>
	private bool m_IsQuitting = false;
	/// <summary>
	/// The Unity Awake() method.
	/// </summary>
	public void Awake()
	{
	// Enable ARCore to target 60fps camera capture frame rate on supported devices.
	// Note, Application.targetFrameRate is ignored when QualitySettings.vSyncCount != 0.
	Application.targetFrameRate = 60;
	}
	/// <summary>
	/// The Unity Update() method.
	/// </summary>
	public void Update()
	{
	_UpdateApplicationLifecycle();
	// If the player has not touched the screen, we are done with this update.
	Touch touch;
	if (Input.touchCount < 1 || (touch = Input.GetTouch(0)).phase != TouchPhase.Began)
	{
	return;
	}
	// Should not handle input if the player is pointing on UI.
	if (EventSystem.current.IsPointerOverGameObject(touch.fingerId))
	{
	return;
	}
	// Raycast against the location the player touched to search for planes.
	TrackableHit hit;
	TrackableHitFlags raycastFilter = TrackableHitFlags.PlaneWithinPolygon |
	TrackableHitFlags.FeaturePointWithSurfaceNormal;
	if (Frame.Raycast(touch.position.x, touch.position.y, raycastFilter, out hit)&& spawned ==false)
	{
	spawned = true;
	// Use hit pose and camera pose to check if hittest is from the
	// back of the plane, if it is, no need to create the anchor.
	if ((hit.Trackable is DetectedPlane) &&
	Vector3.Dot(FirstPersonCamera.transform.position - hit.Pose.position,
	hit.Pose.rotation * Vector3.up) < 0)
	{
	Debug.Log("Hit at back of the current DetectedPlane");
	}
	else
	{
	// Choose the prefab based on the Trackable that got hit.
	GameObject prefab;
	if (hit.Trackable is FeaturePoint)
	{
	prefab = GameObjectPointPrefab;
	}
	else if (hit.Trackable is DetectedPlane)
	{
	DetectedPlane detectedPlane = hit.Trackable as DetectedPlane;
	if (detectedPlane.PlaneType == DetectedPlaneType.Vertical)
	{
	prefab = GameObjectVerticalPlanePrefab;
	}
	else
	{
	prefab = GameObjectHorizontalPlanePrefab;
	}
	}
	else
	{
	prefab = GameObjectHorizontalPlanePrefab;
	}
	// Instantiate prefab at the hit pose.
	var gameObject = Instantiate(prefab, hit.Pose.position, hit.Pose.rotation);
	// Compensate for the hitPose rotation facing away from the raycast (i.e.
	// camera).
	gameObject.transform.Rotate(0, k_PrefabRotation, 0, Space.Self);
	// Create an anchor to allow ARCore to track the hitpoint as understanding of
	// the physical world evolves.
	var anchor = hit.Trackable.CreateAnchor(hit.Pose);
	// Make game object a child of the anchor.
	gameObject.transform.parent = anchor.transform;
	}
	}
	}
	/// <summary>
	/// Check and update the application lifecycle.
	/// </summary>
	private void _UpdateApplicationLifecycle()
	{
	// Exit the app when the 'back' button is pressed.
	if (Input.GetKey(KeyCode.Escape))
	{
	Application.Quit();
	}
	// Only allow the screen to sleep when not tracking.
	if (Session.Status != SessionStatus.Tracking)
	{
	Screen.sleepTimeout = SleepTimeout.SystemSetting;
	}
	else
	{
	Screen.sleepTimeout = SleepTimeout.NeverSleep;
	}
	if (m_IsQuitting)
	{
	return;
	}
	// Quit if ARCore was unable to connect and give Unity some time for the toast to
	// appear.
	if (Session.Status == SessionStatus.ErrorPermissionNotGranted)
	{
	_ShowAndroidToastMessage("Camera permission is needed to run this application.");
	m_IsQuitting = true;
	Invoke("_DoQuit", 0.5f);
	}
	else if (Session.Status.IsError())
	{
	_ShowAndroidToastMessage(
	"ARCore encountered a problem connecting. Please start the app again.");
	m_IsQuitting = true;
	Invoke("_DoQuit", 0.5f);
	}
	}
	/// <summary>
	/// Actually quit the application.
	/// </summary>
	private void _DoQuit()
	{
	Application.Quit();
	}
	/// <summary>
	/// Show an Android toast message.
	/// </summary>
	/// <param name="message">Message string to show in the toast.</param>
	private void _ShowAndroidToastMessage(string message)
	{
	AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
	AndroidJavaObject unityActivity =
	unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
	if (unityActivity != null)
	{
	AndroidJavaClass toastClass = new AndroidJavaClass("android.widget.Toast");
	unityActivity.Call("runOnUiThread", new AndroidJavaRunnable(() =>
	{
	AndroidJavaObject toastObject =
	toastClass.CallStatic<AndroidJavaObject>(
	"makeText", unityActivity, message, 0);
	toastObject.Call("show");
	}));
	}
	}
	}
	}

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