implement dolly reset

Assets/ClusterDisplay/Scripts/DirectorController.cs

     void OnEnable()
     {
         m_Director = GetComponent<PlayableDirector>();
-        m_Director.RebuildGraph();
+        m_Director.RebuildGraph();
+        if (Input.GetKeyDown(KeyCode.R))
+        {
+            m_Director.time = 0;
+            m_Director.Play();
+            return;
+        }
+
-
+        else return;
+        
+        if(!m_Director.playableGraph.IsValid())
+            m_Director.RebuildGraph();
         m_Director.playableGraph.GetRootPlayable(0).SetSpeed(m_Speed);
     }
 }