Add button to reload the ARSession

Assets/Scenes/SimpleAR.meta

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Assets/Scenes/SimpleAR/ARSessionPrefab.prefab

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Assets/Scenes/SimpleAR/ARSessionPrefab.prefab.meta

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Assets/Scenes/SimpleAR/SessionReloader.cs

+using System.Collections;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.XR.ARFoundation;
+
+/// <summary>
+/// Reloads the ARSession by first destroying the ARSession's GameObject
+/// and then instantiating a new ARSession from a Prefab.
+/// </summary>
+public class SessionReloader : MonoBehaviour
+{
+    public ARSession session;
+    public GameObject sessionPrefab;
+    public Button pauseButton;
+    public Button resumeButton;
+    public Button resetButton;
+
+    public void ReloadSession()
+    {
+        if (session != null)
+        {
+            StartCoroutine(DoReload());
+        }
+    }
+
+    IEnumerator DoReload()
+    {
+        Destroy(session.gameObject);
+        yield return null;
+
+        if (sessionPrefab != null)
+        {
+            session = Instantiate(sessionPrefab).GetComponent<ARSession>();
+
+            // Hook the buttons back up
+            resetButton.onClick.AddListener(session.Reset);
+            pauseButton.onClick.AddListener(() => { session.enabled = false; });
+            resumeButton.onClick.AddListener(() => { session.enabled = true; });
+        }
+
+    }
+}

Assets/Scenes/SimpleAR/SessionReloader.cs.meta

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