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Assets/Mirror/Examples/AdditiveScenes/Scripts/ZoneHandler.cs

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+using UnityEngine;
+
+namespace Mirror.Examples.AdditiveScenes
+{
+    // AdditiveNetworkManager, in OnStartServer, instantiates the prefab only on the server.
+    // It never exists for clients (other than host client if there is one).
+    // The prefab has a Sphere Collider with isTrigger = true.
+    // These OnTrigger events only run on the server and will only send a message to the
+    // client that entered the Zone to load the subscene assigned to the subscene property.
+    public class ZoneHandler : MonoBehaviour
+    {
+        [Scene]
+        [Tooltip("Assign the sub-scene to load for this zone")]
+        public string subScene;
+
+        [ServerCallback]
+        void OnTriggerEnter(Collider other)
+        {
+            // ignore collisions with non-Player objects
+            if (!other.CompareTag("Player")) return;
+
+            if (other.TryGetComponent(out NetworkIdentity networkIdentity))
+            {
+                SceneMessage message = new SceneMessage { sceneName = subScene, sceneOperation = SceneOperation.LoadAdditive };
+                networkIdentity.connectionToClient.Send(message);
+            }
+        }
+
+        [ServerCallback]
+        void OnTriggerExit(Collider other)
+        {
+            // ignore collisions with non-Player objects
+            if (!other.CompareTag("Player")) return;
+
+            if (other.TryGetComponent(out NetworkIdentity networkIdentity))
+            {
+                SceneMessage message = new SceneMessage { sceneName = subScene, sceneOperation = SceneOperation.UnloadAdditive };
+                networkIdentity.connectionToClient.Send(message);
+            }
+        }
+    }
+}