pong: NetworkManagerPong handles ball spawn and despawn

Assets/Mirror/Examples/Pong/Scenes/Scene.unity

@@ -219,7 +219,7 @@ Transform:
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   m_Children: []
   m_Father: {fileID: 0}
-  m_RootOrder: 4
+  m_RootOrder: 3
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 --- !u!1 &753891880
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@@ -327,67 +327,6 @@ BoxCollider2D:
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---- !u!1001 &1140775523
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@@ -728,7 +667,7 @@ Transform:
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 0}
-  m_RootOrder: 5
+  m_RootOrder: 4
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1 &1575697329
 GameObject:
@@ -945,9 +884,12 @@ MonoBehaviour:
     type: 3}
   autoCreatePlayer: 1
   playerSpawnMethod: 1
-  spawnPrefabs: []
+  spawnPrefabs:
+  - {fileID: 1080679924113744, guid: 5f7a7f34494ed40268eff49dbf9168bf, type: 3}
   leftRacketSpawn: {fileID: 473997961}
   rightRacketSpawn: {fileID: 1397990096}
+  ballPrefab: {fileID: 1080679924113744, guid: 5f7a7f34494ed40268eff49dbf9168bf, type: 3}
+  ball: {fileID: 0}
 --- !u!114 &1886246553
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Assets/Mirror/Examples/Pong/Scripts/Ball.cs

@@ -10,24 +10,7 @@ public override void OnStartServer()
         {
             // only simulate ball physics on server
             GetComponent<Rigidbody2D>().simulated = true;
-        }
+            GetComponent<Rigidbody2D>().velocity = Vector2.right * speed;
-
-        [ServerCallback]
-        void Update()
-        {
-            Rigidbody2D rb = GetComponent<Rigidbody2D>();
-
-            // if less than two players then reset ball
-            if (NetworkManager.singleton.numPlayers < 2)
-            {
-                rb.velocity = Vector2.zero;
-                transform.position = Vector2.zero;
-            }
-            // if two players joined, then enable velocity if not done yet
-            else if (NetworkManager.singleton.numPlayers == 2 && rb.velocity == Vector2.zero)
-            {
-                rb.velocity = Vector2.right * speed;
-            }
         }
 
         float HitFactor(Vector2 ballPos, Vector2 racketPos, float racketHeight)

Assets/Mirror/Examples/Pong/Scripts/NetworkManagerPong.cs

@@ -8,11 +8,31 @@ public class NetworkManagerPong : NetworkManager
 {
     public Transform leftRacketSpawn;
     public Transform rightRacketSpawn;
+    public GameObject ballPrefab;
+    public GameObject ball;
 
     public override void OnServerAddPlayer(NetworkConnection conn, AddPlayerMessage extraMessage)
     {
+        // add player at correct spawn position
         Transform start = numPlayers == 0 ? leftRacketSpawn : rightRacketSpawn;
         GameObject player = Instantiate(playerPrefab, start.position, start.rotation);
         NetworkServer.AddPlayerForConnection(conn, player);
+
+        // spawn ball if two players
+        if (numPlayers == 2)
+        {
+            ball = Instantiate(ballPrefab);
+            NetworkServer.Spawn(ball);
+        }
+    }
+
+    public override void OnServerDisconnect(NetworkConnection conn)
+    {
+        // destroy ball
+        if (ball != null)
+            NetworkServer.Destroy(ball);
+
+        // call base functionality (actually destroys the player)
+        base.OnServerDisconnect(conn);
     }
 }