com.unity.netcode.gameobjects@2.0.0-exp.4

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

Additional documentation and release notes are available at [Multiplayer Documentation](https://docs-multiplayer.unity3d.com).

## [2.0.0-exp.4] - 2024-05-31

### Added

- Added `NetworkRigidbodyBase.AttachToFixedJoint` and `NetworkRigidbodyBase.DetachFromFixedJoint` to replace parenting for rigid bodies that have `NetworkRigidbodyBase.UseRigidBodyForMotion` enabled. (#2933)
- Added `NetworkBehaviour.OnNetworkPreSpawn` and `NetworkBehaviour.OnNetworkPostSpawn` methods that provide the ability to handle pre and post spawning actions during the `NetworkObject` spawn sequence. (#2912)
- Added a client-side only `NetworkBehaviour.OnNetworkSessionSynchronized` convenience method that is invoked on all `NetworkBehaviour`s after a newly joined client has finished synchronizing with the network session in progress. (#2912)
- Added `NetworkBehaviour.OnInSceneObjectsSpawned` convenience method that is invoked when all in-scene `NetworkObject`s have been spawned after a scene has been loaded or upon a host or server starting. (#2912)

### Fixed

- Fixed issue where non-authoritative rigid bodies with `NetworkRigidbodyBase.UseRigidBodyForMotion` enabled would constantly log errors about the renderTime being before `StartTimeConsumed`. (#2933)
- Fixed issue where in-scene placed NetworkObjects could be destroyed if a client disconnects early and/or before approval. (#2924)
- Fixed issue where a `NetworkObject` component's associated `NetworkBehaviour` components would not be detected if scene loading is disabled in the editor and the currently loaded scene has in-scene placed `NetworkObject`s. (#2912)
- Fixed issue where an in-scene placed `NetworkObject` with `NetworkTransform` that is also parented under a `GameObject` would not properly synchronize when the parent `GameObject` had a world space position other than 0,0,0. (#2898)

### Changed

- Change all the access modifiers of test class from Public to Internal (#2930)
- Changed messages are now sorted by enum values as opposed to ordinally sorting the messages by their type name. (#2929)
- Changed `NetworkClient.SessionModeTypes` to `NetworkClient.NetworkTopologyTypes`. (#2875)
- Changed `NetworkClient.SessionModeType` to `NetworkClient.NetworkTopologyType`. (#2875)
- Changed `NetworkConfig.SessionMode` to `NeworkConfig.NetworkTopology`. (#2875)

Runtime/SceneManagement/SceneEventData.cs

@@ -839,7 +839,7 @@ namespace Unity.Netcode
             {
                 // is not packed!
                 InternalBuffer.ReadValueSafe(out ushort newObjectsCount);
-
+                var sceneObjects = new List<NetworkObject>();
                 for (ushort i = 0; i < newObjectsCount; i++)
                 {
                     var sceneObject = new NetworkObject.SceneObject();
@@ -851,10 +851,22 @@ namespace Unity.Netcode
                         m_NetworkManager.SceneManager.SetTheSceneBeingSynchronized(sceneObject.NetworkSceneHandle);
                     }
 
-                    NetworkObject.AddSceneObject(sceneObject, InternalBuffer, m_NetworkManager);
+                    var networkObject = NetworkObject.AddSceneObject(sceneObject, InternalBuffer, m_NetworkManager);
+
+                    if (sceneObject.IsSceneObject)
+                    {
+                        sceneObjects.Add(networkObject);
+                    }
                 }
                 // Now deserialize the despawned in-scene placed NetworkObjects list (if any)
                 DeserializeDespawnedInScenePlacedNetworkObjects();
+
+                // Notify all newly spawned in-scene placed NetworkObjects that all in-scene placed
+                // NetworkObjects have been spawned.
+                foreach (var networkObject in sceneObjects)
+                {
+                    networkObject.InternalInSceneNetworkObjectsSpawned();
+                }
             }
             finally
             {
@@ -1122,6 +1134,15 @@ namespace Unity.Netcode
                     UnityEngine.Debug.Log(builder.ToString());
                 }
 
+                // Notify that all in-scene placed NetworkObjects have been spawned
+                foreach (var networkObject in m_NetworkObjectsSync)
+                {
+                    if (networkObject.IsSceneObject.HasValue && networkObject.IsSceneObject.Value)
+                    {
+                        networkObject.InternalInSceneNetworkObjectsSpawned();
+                    }
+                }
+
                 // Now deserialize the despawned in-scene placed NetworkObjects list (if any)
                 DeserializeDespawnedInScenePlacedNetworkObjects();