working on actors

Runtime/Engine/Code/Development/DebugOverlayView.cs

@@ -1,5 +1,8 @@
-using RebootKit.Engine.Main;
+using System.Text;
+using RebootKit.Engine.Main;
 using RebootKit.Engine.UI;
+using Unity.Netcode;
+using Unity.Netcode.Transports.UTP;
 using UnityEngine;
 using UnityEngine.UIElements;
 
@@ -10,6 +13,7 @@ namespace RebootKit.Engine.Services.Development {
         VisualElement m_RootElement;
         
         Label m_FPSLabel;
+        Label m_NetworkStatsLabel;
 
         void Update() {
             if (m_RootElement == null) {
@@ -18,6 +22,17 @@ namespace RebootKit.Engine.Services.Development {
 
             Resolution resolution = Screen.currentResolution;
             m_FPSLabel.text = $"fps: {Mathf.RoundToInt(1f / Time.deltaTime)} | dt: {Time.deltaTime:F4}ms | runtime: {Time.time:F4}s | resolution: {resolution.width}x{resolution.height}@{resolution.refreshRateRatio}Hz";
+            
+            NetworkManager nm = NetworkManager.Singleton;
+            
+            StringBuilder sb = new StringBuilder();
+            
+            sb.Append("Network: ");
+            sb.Append($"IsServer: {nm.IsServer}");
+            sb.Append($" | IsClient: {nm.IsClient}");
+            sb.Append($" | IsHost: {nm.IsHost}");
+            
+            m_NetworkStatsLabel.text = sb.ToString();
         }
 
         public override VisualElement Build() {
@@ -26,6 +41,8 @@ namespace RebootKit.Engine.Services.Development {
             CreateLabel($"Toggle Overlay [F3] | RebootKit | game: {Application.productName}, version: {Application.version}");
             m_FPSLabel = CreateLabel($"FPS: {Application.targetFrameRate}");
             
+            m_NetworkStatsLabel = CreateLabel("Network Stats");
+            
             return m_RootElement;
         }
 

Runtime/Engine/Code/Foundation/UniqueID.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace RebootKit.Engine.Foundation {
+    public static class UniqueID {
+        public static ulong NewULongFromGuid() {
+            Guid guid = Guid.NewGuid();
+            byte[] bytes = guid.ToByteArray();
+            ulong id = BitConverter.ToUInt64(bytes, 0);
+            return id;
+        }
+    }
+}

Runtime/Engine/Code/Foundation/UniqueID.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 7e7c51400f234e5986c5d2779ca00fb3
+timeCreated: 1751491055

Runtime/Engine/Code/Main/Game.cs

@@ -10,41 +10,26 @@ namespace RebootKit.Engine.Main {
     public abstract class Game : NetworkBehaviour {
         static readonly Logger s_GameLogger = new Logger(nameof(Game));
         
-        protected NetworkVariable<FixedString128Bytes> m_CurrentWorldID =
+        // Server only callbacks
-                new NetworkVariable<FixedString128Bytes>(new FixedString128Bytes(""));
+        protected virtual void OnPlayerBecameReady(ulong clientID) {
+        }
 
         // Event callbacks
-        public virtual void OnWorldLoaded() {
+        protected virtual void OnChatMessage(string message) {
-        }
-
-        public virtual void OnWorldUnload() {
-        }
-
-        public virtual void OnChatMessage(string message) {
             s_GameLogger.Info($"Chat: {message}");
         }
 
-        // Network
+        // NGO callbacks
         public override void OnNetworkSpawn() {
             base.OnNetworkSpawn();
             RR.GameInstance = this;
-
-            m_CurrentWorldID.OnValueChanged += OnCurrentWorldIDChanged;
-            LoadWorld(m_CurrentWorldID.Value.Value);
         }
 
         public override void OnNetworkDespawn() {
             base.OnNetworkDespawn();
-
-            m_CurrentWorldID.OnValueChanged -= OnCurrentWorldIDChanged;
             RR.GameInstance = null;
         }
 
-        [ServerRpc]
-        public void SetCurrentWorldServerRpc(string worldID) {
-            m_CurrentWorldID.Value = new FixedString128Bytes(worldID);
-        }
-
         // Chat
         [Rpc(SendTo.Server)]
         public void SendChatMessageRpc(string message) {
@@ -56,23 +41,13 @@ namespace RebootKit.Engine.Main {
             OnChatMessage(message);
         }
 
-        void OnCurrentWorldIDChanged(FixedString128Bytes previousValue, FixedString128Bytes newValue) {
+        internal void PlayerBecameReady(ulong clientID) {
-            string worldID = newValue.Value;
+            if (!IsServer) {
-            LoadWorld(worldID);
+                s_GameLogger.Error("PlayerBecameReady called on client, but this should only be called on the server.");
+                return;
             }
 
-        void LoadWorld(string worldID) {
+            OnPlayerBecameReady(clientID);
-            if (string.IsNullOrEmpty(worldID)) {
-                RR.World.Unload();
-            } else {
-                WorldConfigAsset worldConfigAsset = RR.GetWorldConfigAsset(worldID);
-                if (worldConfigAsset is not null) {
-                    RR.CloseMainMenu();
-                    RR.World.LoadAsync(worldConfigAsset.Config, Application.exitCancellationToken).Forget();
-                } else {
-                    s_GameLogger.Error($"World config asset for '{worldID}' not found.");
-                }
-            }
         }
     }
 }

Runtime/Engine/Code/Main/NetworkSystem.cs

@@ -0,0 +1,200 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using RebootKit.Engine.Services.Simulation;
+using RebootKit.Engine.Simulation;
+using Unity.Collections;
+using Unity.Netcode;
+using UnityEngine;
+using Logger = RebootKit.Engine.Foundation.Logger;
+
+namespace RebootKit.Engine.Main {
+    class NetworkClientState {
+        public ulong ClientID;
+        public bool IsWorldLoaded;
+        public bool AreActorsSynced;
+        public bool IsReadyForActorsSync;
+        public int ActorsSyncPacketsLeft;
+
+        public bool IsReady;
+    }
+
+    public class NetworkSystem : NetworkBehaviour {
+        static readonly Logger s_Logger = new Logger(nameof(NetworkSystem));
+
+        [field: SerializeField] public ActorsManager Actors { get; private set; }
+
+        readonly Dictionary<ulong, NetworkClientState> m_Clients = new Dictionary<ulong, NetworkClientState>();
+
+        FixedString512Bytes m_WorldID = new FixedString512Bytes("");
+        bool m_IsChangingWorld = false;
+
+        void Awake() {
+            RR.NetworkSystemInstance = this;
+        }
+
+        public override void OnNetworkSpawn() {
+            base.OnNetworkSpawn();
+
+            NetworkManager.Singleton.OnClientConnectedCallback += OnClientConnected;
+            NetworkManager.Singleton.OnClientDisconnectCallback += OnClientDisconnect;
+        }
+
+        public override void OnNetworkDespawn() {
+            base.OnNetworkDespawn();
+
+            NetworkManager.Singleton.OnClientConnectedCallback -= OnClientConnected;
+            NetworkManager.Singleton.OnClientDisconnectCallback -= OnClientDisconnect;
+        }
+
+        void OnClientConnected(ulong clientID) {
+            if (!IsServer) {
+                return;
+            }
+
+            s_Logger.Info($"OnClientConnected: {clientID}");
+
+            NetworkClientState newClientState = new NetworkClientState {
+                ClientID = clientID,
+                IsWorldLoaded = false,
+                AreActorsSynced = false,
+                IsReadyForActorsSync = false,
+                IsReady = false
+            };
+            m_Clients.Add(clientID, newClientState);
+
+            if (!m_WorldID.IsEmpty) {
+                s_Logger.Info($"Synchronizing world load for client {clientID} with world ID '{m_WorldID}'");
+                ClientLoadWorldRpc(m_WorldID.ToString(), RpcTarget.Single(clientID, RpcTargetUse.Temp));
+            }
+        }
+
+        void OnClientDisconnect(ulong clientID) {
+            if (!IsServer) {
+                return;
+            }
+            
+            s_Logger.Info($"OnClientDisconnect: {clientID}");
+            m_Clients.Remove(clientID);
+        }
+        
+        internal NetworkClientState GetClientState(ulong clientID) {
+            if (m_Clients.TryGetValue(clientID, out NetworkClientState clientState)) {
+                return clientState;
+            }
+
+            s_Logger.Error($"Client state for {clientID} not found.");
+            return null;
+        }
+
+        public void SetCurrentWorld(string worldID) {
+            if (!IsServer) {
+                s_Logger.Error("Only server can set the current world.");
+                return;
+            }
+
+            if (m_IsChangingWorld) {
+                s_Logger.Error($"Already changing world to '{m_WorldID}'. Please wait until the current world change is complete.");
+                return;
+            }
+
+            WorldConfigAsset worldConfigAsset = RR.GetWorldConfigAsset(worldID);
+            if (worldConfigAsset is null) {
+                s_Logger.Error($"Failed to set current world: World config asset for '{worldID}' not found.");
+                return;
+            }
+
+            m_WorldID = worldID;
+
+            foreach (KeyValuePair<ulong, NetworkClientState> kv in m_Clients) {
+                kv.Value.IsWorldLoaded = false;
+                kv.Value.AreActorsSynced = false;
+                kv.Value.IsReadyForActorsSync = false;
+                kv.Value.IsReady = false;
+            }
+
+            ServerLoadWorldAsync(worldConfigAsset, destroyCancellationToken).Forget();
+        }
+
+        async UniTask ServerLoadWorldAsync(WorldConfigAsset asset, CancellationToken cancellationToken) {
+            s_Logger.Info($"ServerLoadWorldAsync: {asset.Config.name}");
+
+            m_IsChangingWorld = true;
+
+            RR.World.Unload();
+            RR.CloseMainMenu();
+
+            await RR.World.LoadAsync(asset.Config, cancellationToken);
+
+            m_IsChangingWorld = false;
+
+            NetworkClientState localClientState = GetClientState(NetworkManager.Singleton.LocalClientId);
+            localClientState.IsReady = true;
+
+            RR.GameInstance.PlayerBecameReady(localClientState.ClientID);
+
+            ClientLoadWorldRpc(asset.name, RpcTarget.NotMe);
+        }
+
+        [Rpc(SendTo.SpecifiedInParams, Delivery = RpcDelivery.Reliable)]
+        void ClientLoadWorldRpc(string worldID, RpcParams rpcParams) {
+            WorldConfigAsset worldConfigAsset = RR.GetWorldConfigAsset(worldID);
+            if (worldConfigAsset is null) {
+                s_Logger.Error($"World config asset for '{worldID}' not found.");
+                RR.Disconnect();
+                return;
+            }
+
+            ClientLoadWorldAsync(worldID, destroyCancellationToken).Forget();
+        }
+
+        async UniTask ClientLoadWorldAsync(string worldID, CancellationToken cancellationToken) {
+            s_Logger.Info($"ClientLoadWorldAsync: {worldID}");
+
+            WorldConfigAsset worldConfigAsset = RR.GetWorldConfigAsset(worldID);
+            if (worldConfigAsset is null) {
+                s_Logger.Error($"World config asset for '{worldID}' not found.");
+                return;
+            }
+
+            RR.World.Unload();
+            RR.CloseMainMenu();
+
+            await RR.World.LoadAsync(worldConfigAsset.Config, cancellationToken);
+
+            m_WorldID = worldID;
+            ClientLoadedWorldRpc(worldID);
+        }
+
+        [Rpc(SendTo.Server, Delivery = RpcDelivery.Reliable)]
+        void ClientLoadedWorldRpc(string worldID, RpcParams rpcParams = default) {
+            ulong clientID = rpcParams.Receive.SenderClientId;
+
+            if (!m_WorldID.Equals(worldID)) {
+                s_Logger.Error($"Client {clientID} tried to load world '{worldID}', but server is in world '{m_WorldID}'.");
+                NetworkManager.Singleton.DisconnectClient(clientID, "World mismatch!");
+                return;
+            }
+
+            if (m_Clients.TryGetValue(clientID, out NetworkClientState clientState)) {
+                clientState.IsWorldLoaded = true;
+                clientState.IsReadyForActorsSync = false;
+                Actors.SynchronizeActorsForClient(clientID);
+            } else {
+                NetworkManager.Singleton.DisconnectClient(clientID, "Client is not registered!");
+            }
+        }
+        
+        internal void ClientSynchronizedActors(ulong clientID) {
+            NetworkClientState clientState = GetClientState(clientID);
+            if (clientState is null) {
+                s_Logger.Error($"Client state for {clientID} not found.");
+                return;
+            }
+
+            clientState.IsReady = true;
+            RR.GameInstance.PlayerBecameReady(clientID);
+        }
+    }
+}

Runtime/Engine/Code/Main/NetworkSystem.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1f967d37c17e4704b80849c305a53be9
+timeCreated: 1751411566

Runtime/Engine/Code/Main/RR.cs

@@ -27,7 +27,7 @@ namespace RebootKit.Engine.Main {
         [ConfigVar("con.write_log", 1, "Enables writing game log to console output")]
         static ConfigVar s_writeLogToConsole;
 
-        [ConfigVar("sv.tick_rate", 60, "Server tick rate in Hz")]
+        [ConfigVar("sv.tick_rate", 24, "Server tick rate in Hz")]
         public static ConfigVar TickRate;
 
         internal static EngineConfigAsset EngineConfig;
@@ -37,6 +37,9 @@ namespace RebootKit.Engine.Main {
 
         static AsyncOperationHandle<SceneInstance> s_mainMenuSceneHandle;
 
+        static NetworkSystem s_networkSystemPrefab;
+        internal static NetworkSystem NetworkSystemInstance;
+
         internal static ConsoleService Console { get; private set; }
         public static InputService Input { get; private set; }
         public static WorldService World { get; private set; }
@@ -68,11 +71,14 @@ namespace RebootKit.Engine.Main {
 
             await InitializeAssetsAsync(cancellationToken);
 
-            await SteamManager.InitializeAsync(cancellationToken);
+            // await SteamManager.InitializeAsync(cancellationToken);
         }
 
         // @NOTE: This method is called after the main scene is loaded.
         internal static async UniTask RunAsync(CancellationToken cancellationToken) {
+            s_networkSystemPrefab =
+                Resources.Load<NetworkSystem>(RConsts.k_CoreNetworkGameSystemsResourcesPath);
+
             NetworkManager.Singleton.OnConnectionEvent += OnConnectionEvent;
             NetworkManager.Singleton.OnServerStarted += OnServerStarted;
             NetworkManager.Singleton.OnServerStopped += OnServerStopped;
@@ -111,7 +117,7 @@ namespace RebootKit.Engine.Main {
                 NetworkManager.Singleton.OnServerStopped -= OnServerStopped;
             }
 
-            SteamManager.Shutdown();
+            // SteamManager.Shutdown();
 
             s_servicesBag.Dispose();
             s_disposableBag.Dispose();
@@ -138,7 +144,7 @@ namespace RebootKit.Engine.Main {
 
             WorldConfigAsset worldConfig =
                 s_WorldConfigsAssets.Find(asset => asset.Config.name.Equals(name, StringComparison.Ordinal));
-            if (!worldConfig) {
+            if (worldConfig is null) {
                 throw new KeyNotFoundException($"World config '{name}' not found");
             }
 
@@ -187,7 +193,29 @@ namespace RebootKit.Engine.Main {
                 return;
             }
 
-            GameInstance.SetCurrentWorldServerRpc(worldID);
+            NetworkSystemInstance.SetCurrentWorld(worldID);
+        }
+
+        public static void SpawnActor(AssetReferenceGameObject assetReference,
+                                      Vector3 position,
+                                      Quaternion rotation) {
+            if (!IsServer()) {
+                s_Logger.Error("Cannot spawn actor. Not a server instance.");
+                return;
+            }
+            
+            if (NetworkSystemInstance is null) {
+                s_Logger.Error("NetworkSystemInstance is not initialized. Cannot spawn actor.");
+                return;
+            }
+
+            if (!assetReference.RuntimeKeyIsValid()) {
+                s_Logger.Error("Asset reference is not valid. Cannot spawn actor.");
+                return;
+            }
+
+            s_Logger.Info($"Spawning actor from asset reference: {assetReference.RuntimeKey}");
+            NetworkSystemInstance.Actors.SpawnActor(assetReference, position, rotation);
         }
 
         // Service API
@@ -343,8 +371,6 @@ namespace RebootKit.Engine.Main {
 
                 TickCount++;
             }
-
-            World.Tick(deltaTime);
         }
 
         static void OnConnectionEvent(NetworkManager network, ConnectionEventData data) {
@@ -356,6 +382,9 @@ namespace RebootKit.Engine.Main {
 
             GameInstance = Object.Instantiate(EngineConfig.gamePrefab);
             GameInstance.NetworkObject.Spawn();
+            
+            NetworkSystemInstance = Object.Instantiate(s_networkSystemPrefab);
+            NetworkSystemInstance.NetworkObject.Spawn();
         }
 
         static void OnServerStopped(bool obj) {
@@ -363,10 +392,13 @@ namespace RebootKit.Engine.Main {
 
             if (GameInstance is not null) {
                 GameInstance.NetworkObject.Despawn();
-                Object.Destroy(GameInstance.gameObject);
+                GameInstance = null;
             }
             
-            GameInstance = null;
+            if (NetworkSystemInstance is not null) {
+                NetworkSystemInstance.NetworkObject.Despawn();
+                NetworkSystemInstance = null;
+            }
         }
 
         // Console Commands

Runtime/Engine/Code/RConsts.cs

@@ -8,6 +8,8 @@
         public const string k_EngineConfigResourcesPath = "TheGame/" + k_EngineConfigAssetName;
         public const string k_EngineConfigAssetPath = "Assets/TheGame/" + k_EngineConfigAssetName + ".asset";
 
+        public const string k_CoreNetworkGameSystemsResourcesPath = "RebootKit/core_network_game_systems";
+
         internal const string k_AddComponentMenu = "Reboot Reality/";
         
         internal const string k_CreateAssetMenu = "Reboot Reality/";

Runtime/Engine/Code/Simulation/Actor.cs

@@ -1,48 +1,247 @@
-using Unity.Collections;
+using System;
+using NUnit.Framework;
+using RebootKit.Engine.Foundation;
+using RebootKit.Engine.Main;
+using Unity.Collections;
+using Unity.Collections.LowLevel.Unsafe;
+using Unity.Netcode;
 using UnityEngine;
+using Logger = RebootKit.Engine.Foundation.Logger;
 
 namespace RebootKit.Engine.Simulation {
-    public abstract class Actor : MonoBehaviour {
+    public interface ISerializableEntity {
-        bool m_IsPlaying = false;
+        void Serialize(FastBufferWriter writer);
-        public bool IsPlaying {
+        void Deserialize(FastBufferReader reader);
-            get {
+
-                return m_IsPlaying;
+        // @NOTE: -1 means use the default size and have hope it will fit.
+        int MinimumSizeInBytes() { return -1; }
     }
 
-            set {
+    public interface IActorData : ISerializableEntity { }
-                if (m_IsPlaying == value) {
+
+    public class NoActorData : IActorData {
+        public void Serialize(FastBufferWriter writer) { }
+
+        public void Deserialize(FastBufferReader reader) { }
+    }
+
+    public static class DataSerializationUtils {
+        public const int k_DefaultMessageSize = 256;
+
+        public static NativeArray<byte> Serialize<TEntity>(TEntity entity,
+                                                                      Allocator allocator = Allocator.Temp)
+            where TEntity : ISerializableEntity {
+            int size = entity.MinimumSizeInBytes();
+            if (size < 0) {
+                size = k_DefaultMessageSize;
+            }
+
+            using FastBufferWriter writer = new FastBufferWriter(size, allocator);
+            if (writer.TryBeginWrite(size)) {
+                entity.Serialize(writer);
+
+                int length = writer.Length;
+                NativeArray<byte> data = new NativeArray<byte>(length, allocator);
+
+                unsafe {
+                    void* dst = data.GetUnsafePtr();
+                    void* src = writer.GetUnsafePtr();
+                    Buffer.MemoryCopy(src, dst, length, length);
+                }
+
+                return data;
+            }
+
+            return default;
+        }
+
+        public static void Deserialize<TEntity>(NativeArray<byte> data, ref TEntity entity)
+            where TEntity : ISerializableEntity {
+            using FastBufferReader reader = new FastBufferReader(data, Allocator.Temp);
+            if (reader.TryBeginRead(data.Length)) {
+                entity.Deserialize(reader);
+            }
+        }
+    }
+
+    public struct ActorCommand : INetworkSerializable {
+        public ulong ActorID;
+        public ulong ClientID;
+        public ushort CommandID;
+        public NativeArray<byte> Data;
+
+        public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter {
+            serializer.SerializeValue(ref ActorID);
+            serializer.SerializeValue(ref ClientID);
+            serializer.SerializeValue(ref CommandID);
+
+            if (serializer.IsWriter) {
+                bool hasData = Data.IsCreated;
+                serializer.SerializeValue(ref hasData);
+
+                if (hasData) {
+                    serializer.SerializeValue(ref Data, Allocator.Temp);
+                }
+            } else if (serializer.IsReader) {
+                bool hasData = false;
+                serializer.SerializeValue(ref hasData);
+
+                if (hasData) {
+                    serializer.SerializeValue(ref Data, Allocator.Temp);
+                }
+            }
+        }
+    }
+
+    public struct ActorEvent : INetworkSerializable {
+        public ulong ActorID;
+        public ulong ClientID;
+        public ushort EventID;
+        public NativeArray<byte> Data;
+
+        public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter {
+            serializer.SerializeValue(ref ActorID);
+            serializer.SerializeValue(ref ClientID);
+            serializer.SerializeValue(ref EventID);
+
+            if (serializer.IsWriter) {
+                bool hasData = Data.IsCreated;
+                serializer.SerializeValue(ref hasData);
+
+                if (hasData) {
+                    serializer.SerializeValue(ref Data, Allocator.Temp);
+                }
+            } else if (serializer.IsReader) {
+                bool hasData = false;
+                serializer.SerializeValue(ref hasData);
+
+                if (hasData) {
+                    serializer.SerializeValue(ref Data, Allocator.Temp);
+                }
+            }
+        }
+    }
+
+    public abstract class Actor : MonoBehaviour {
+        static readonly Logger s_ActorLogger = new Logger(nameof(Actor));
+
+        [field: SerializeField, TriInspector.ReadOnly] public string SourceActorPath { get; internal set; } = "";
+        [field: SerializeField, ReadOnly] public ulong ActorID { get; internal set; }
+
+        [NonSerialized] internal IActorData Data;
+
+        public bool IsDataDirty { get; protected internal set; }
+
+        internal ActorsManager Manager;
+
+        internal IActorData InternalCreateActorData() {
+            return CreateActorData();
+        }
+
+        internal void HandleActorCommand(ActorCommand actorCommand) {
+            if (!RR.IsServer()) {
+                s_ActorLogger.Error($"Only the server can handle actor commands. Actor: {name} (ID: {ActorID})");
                 return;
             }
 
-                m_IsPlaying = value;
+            if (Manager is null) {
-
+                s_ActorLogger.Error($"Cannot handle command because Manager is null for actor {name} (ID: {ActorID})");
-                if (m_IsPlaying) {
+                return;
-                    OnBeginPlay();
-                } else {
-                    OnEndPlay();
-                }
-            }
             }
 
-        public virtual void OnSpawned() {
+            if (actorCommand.ActorID != ActorID) {
+                s_ActorLogger
+                    .Error($"Actor command ActorID {actorCommand.ActorID} does not match this actor's ID {ActorID}");
+                return;
             }
 
-        public virtual void OnDespawned() {
+            OnActorCommandServer(actorCommand);
         }
 
-        public virtual void OnBeginPlay() {
+        internal void HandleActorEvent(ActorEvent actorEvent) {
+            if (Manager is null) {
+                s_ActorLogger.Error($"Cannot handle event because Manager is null for actor {name} (ID: {ActorID})");
+                return;
             }
 
-        public virtual void OnEndPlay() {
+            if (actorEvent.ActorID != ActorID) {
+                s_ActorLogger
+                    .Error($"Actor event ActorID {actorEvent.ActorID} does not match this actor's ID {ActorID}");
+                return;
             }
 
-        public virtual void Tick(float deltaTime) {
+            OnActorEventClient(actorEvent);
         }
 
-        public virtual void SerializeNetworkState(ref DataStreamWriter writer) {
+        protected abstract IActorData CreateActorData();
+
+        // Override this method to implement server-side logic
+        public virtual void ServerTick(float deltaTime) { }
+
+        // Override this method to implement client-side logic
+        public virtual void ClientTick(float deltaTime) { }
+
+        // @NOTE: Server-side method to handle actor commands
+        protected virtual void OnActorCommandServer(ActorCommand actorCommand) { }
+
+        // @NOTE: Client-side method to handle actor events
+        protected virtual void OnActorEventClient(ActorEvent actorEvent) { }
+
+        protected void SendActorCommand<TCmdData>(ushort commandID, ref TCmdData commandData)
+            where TCmdData : struct, ISerializableEntity {
+            NativeArray<byte> data = DataSerializationUtils.Serialize(commandData);
+            SendActorCommand(commandID, data);
         }
 
-        public virtual void DeserializeNetworkState(ref DataStreamReader reader) {
+        protected void SendActorCommand(ushort commandID, NativeArray<byte> data = default) {
+            if (Manager is null) {
+                s_ActorLogger.Error($"Cannot send command because Manager is null for actor {name} (ID: {ActorID})");
+                return;
+            }
+
+            ActorCommand command = new ActorCommand {
+                ActorID = ActorID,
+                ClientID = NetworkManager.Singleton.LocalClientId,
+                CommandID = commandID,
+                Data = data
+            };
+
+            Manager.SendActorCommandToServerRpc(command);
+        }
+
+        protected void SendActorEvent(ushort eventID, NativeArray<byte> data = default) {
+            if (!RR.IsServer()) {
+                s_ActorLogger.Error($"Only the server can send actor events. Actor: {name} (ID: {ActorID})");
+                return;
+            }
+
+            if (Manager is null) {
+                s_ActorLogger.Error($"Cannot send event because Manager is null for actor {name} (ID: {ActorID})");
+                return;
+            }
+
+            ActorEvent actorEvent = new ActorEvent {
+                ActorID = ActorID,
+                ClientID = NetworkManager.Singleton.LocalClientId,
+                EventID = eventID,
+                Data = data
+            };
+
+            Manager.SendActorEventToClientsRpc(actorEvent);
+        }
+
+        protected T DataAs<T>() where T : IActorData {
+            if (Data is T data) {
+                return data;
+            }
+
+            throw new System.InvalidCastException($"Actor data is not of type {typeof(T).Name}");
+        }
+
+        void OnValidate() {
+            if (ActorID == 0) {
+                ActorID = UniqueID.NewULongFromGuid();
+            }
         }
     }
 }

Runtime/Engine/Code/Simulation/ActorsManager.cs

@@ -0,0 +1,338 @@
+using System.Collections.Generic;
+using RebootKit.Engine.Foundation;
+using RebootKit.Engine.Main;
+using Unity.Collections;
+using Unity.Netcode;
+using UnityEngine;
+using UnityEngine.AddressableAssets;
+using Logger = RebootKit.Engine.Foundation.Logger;
+
+namespace RebootKit.Engine.Simulation {
+    
+    // @TODO:
+    // - Actors States might be packed into chunks to reduce the number of RPCs sent.
+    public class ActorsManager : NetworkBehaviour {
+        static readonly Logger s_Logger = new Logger(nameof(ActorsManager));
+
+        readonly List<Actor> m_InSceneActors = new List<Actor>();
+        readonly List<Actor> m_SpawnedActors = new List<Actor>();
+
+        public override void OnNetworkSpawn() {
+            base.OnNetworkSpawn();
+            RR.ServerTick += OnServerTick;
+        }
+
+        public override void OnNetworkDespawn() {
+            base.OnNetworkDespawn();
+            RR.ServerTick -= OnServerTick;
+        }
+
+        void Update() {
+            foreach (Actor actor in m_InSceneActors) {
+                actor.ClientTick(Time.deltaTime);
+            }
+        }
+
+        void OnServerTick(ulong tick) {
+            if (!IsServer) {
+                return;
+            }
+
+            float dt = 1.0f / RR.TickRate.IndexValue;
+
+            foreach (Actor actor in m_InSceneActors) {
+                actor.ServerTick(dt);
+
+                if (actor.IsDataDirty) {
+                    actor.IsDataDirty = false;
+
+                    NativeArray<byte> data = SerializeActorState(actor);
+                    if (data.IsCreated) {
+                        SynchronizeActorStateClientRpc(actor.ActorID, data);
+                    } else {
+                        s_Logger.Error($"Failed to serialize actor data for {actor.name}");
+                    }
+                }
+            }
+
+            foreach (Actor actor in m_SpawnedActors) {
+                actor.ServerTick(dt);
+
+                if (actor.IsDataDirty) {
+                    actor.IsDataDirty = false;
+
+                    NativeArray<byte> data = SerializeActorState(actor);
+                    if (data.IsCreated) {
+                        SynchronizeActorStateClientRpc(actor.ActorID, data);
+                    } else {
+                        s_Logger.Error($"Failed to serialize actor data for {actor.name}");
+                    }
+                }
+            }
+        }
+
+        [ClientRpc(Delivery = RpcDelivery.Unreliable)]
+        void SynchronizeActorStateClientRpc(ulong actorID, NativeArray<byte> data) {
+            Actor actor = FindActorByID(actorID);
+            if (actor is null) {
+                return;
+            }
+
+            DeserializeActorState(actor, data);
+        }
+
+        NativeArray<byte> SerializeActorState(Actor actor) {
+            return DataSerializationUtils.Serialize(actor.Data);
+        }
+
+        void DeserializeActorState(Actor actor, NativeArray<byte> data) {
+            DataSerializationUtils.Deserialize(data, ref actor.Data);
+        }
+
+        internal void SynchronizeActorsForClient(ulong clientID) {
+            NetworkClientState clientState = RR.NetworkSystemInstance.GetClientState(clientID);
+            if (clientState == null) {
+                s_Logger.Error($"Client state for {clientID} not found. Cannot synchronize actors.");
+                return;
+            }
+
+            PrepareClientForActorsSyncRpc(RpcTarget.Single(clientState.ClientID, RpcTargetUse.Temp));
+        }
+
+        [Rpc(SendTo.SpecifiedInParams, Delivery = RpcDelivery.Reliable)]
+        void PrepareClientForActorsSyncRpc(RpcParams rpcParams) {
+            foreach (Actor spawnedActor in m_SpawnedActors) {
+                Destroy(spawnedActor.gameObject);
+            }
+
+            m_SpawnedActors.Clear();
+
+            ClientIsReadyForActorsSyncRpc();
+        }
+
+        [Rpc(SendTo.Server)]
+        void ClientIsReadyForActorsSyncRpc(RpcParams rpcParams = default) {
+            ulong clientID = rpcParams.Receive.SenderClientId;
+            NetworkClientState clientState = RR.NetworkSystemInstance.GetClientState(clientID);
+            if (clientState == null) {
+                s_Logger.Error($"Client state for {clientID} not found. Cannot mark client as ready for actors sync.");
+                return;
+            }
+
+            clientState.IsReadyForActorsSync = true;
+            clientState.ActorsSyncPacketsLeft = m_InSceneActors.Count;
+
+            RpcSendParams sendParams = RpcTarget.Single(clientID, RpcTargetUse.Temp);
+
+            foreach (Actor actor in m_InSceneActors) {
+                NativeArray<byte> data = SerializeActorState(actor);
+                if (!data.IsCreated) {
+                    s_Logger.Error($"Failed to serialize actor data for {actor.name}");
+                    continue;
+                }
+
+                SynchronizeActorStateForClientRpc(actor.ActorID, data, sendParams);
+            }
+            
+            foreach (Actor actor in m_SpawnedActors) {
+                NativeArray<byte> data = SerializeActorState(actor);
+                if (!data.IsCreated) {
+                    s_Logger.Error($"Failed to serialize actor data for {actor.name}");
+                    continue;
+                }
+
+                SpawnActorRpc(actor.SourceActorPath,
+                              actor.ActorID,
+                              actor.transform.position,
+                              actor.transform.localRotation,
+                              data,
+                              sendParams);
+            }
+        }
+
+        [Rpc(SendTo.SpecifiedInParams, Delivery = RpcDelivery.Reliable)]
+        void SynchronizeActorStateForClientRpc(ulong actorID, NativeArray<byte> data, RpcParams rpcParams) {
+            Actor actor = FindActorByID(actorID);
+            if (actor is null) {
+                return;
+            }
+
+            DeserializeActorState(actor, data);
+            ClientSynchronizedActorRpc();
+        }
+
+        [Rpc(SendTo.Server, Delivery = RpcDelivery.Reliable)]
+        void ClientSynchronizedActorRpc(RpcParams rpcParams = default) {
+            ulong clientID = rpcParams.Receive.SenderClientId;
+
+            NetworkClientState clientState = RR.NetworkSystemInstance.GetClientState(clientID);
+            if (clientState == null) {
+                s_Logger.Error($"Client state for {clientID} not found. Cannot mark client as synchronized.");
+                return;
+            }
+
+            clientState.ActorsSyncPacketsLeft--;
+            if (clientState.ActorsSyncPacketsLeft == 0) {
+                RR.NetworkSystemInstance.ClientSynchronizedActors(clientID);
+            }
+        }
+
+        [Rpc(SendTo.Server, Delivery = RpcDelivery.Reliable)]
+        internal void SendActorCommandToServerRpc(ActorCommand cmd) {
+            if (!IsServer) {
+                s_Logger.Error("Only the server can handle actor events.");
+                return;
+            }
+
+            Actor actor = FindActorByID(cmd.ActorID);
+            if (actor is null) {
+                s_Logger.Error($"Actor with ID {cmd.ActorID} not found for command {cmd.CommandID}");
+                return;
+            }
+
+            actor.HandleActorCommand(cmd);
+        }
+
+        [Rpc(SendTo.Everyone)]
+        internal void SendActorEventToClientsRpc(ActorEvent actorEvent) {
+            Actor actor = FindActorByID(actorEvent.ActorID);
+            if (actor is null) {
+                s_Logger.Error($"Actor with ID {actorEvent.ActorID} not found for event {actorEvent.EventID}");
+                return;
+            }
+
+            actor.HandleActorEvent(actorEvent);
+        }
+
+        public void RegisterInSceneActor(Actor actor) {
+            if (actor.Data == null) {
+                actor.Data = actor.InternalCreateActorData();
+            }
+
+            actor.Manager = this;
+
+            m_InSceneActors.Add(actor);
+        }
+
+        public void CleanUp() {
+            if (IsServer) {
+                CleanUpRpc();
+            }
+
+            m_InSceneActors.Clear();
+
+            foreach (Actor actor in m_SpawnedActors) {
+                if (actor is not null) {
+                    Destroy(actor.gameObject);
+                }
+            }
+
+            m_SpawnedActors.Clear();
+        }
+
+        [Rpc(SendTo.NotMe)]
+        void CleanUpRpc() {
+            CleanUp();
+        }
+
+        public Actor FindActorByID(ulong actorID) {
+            foreach (Actor actor in m_InSceneActors) {
+                if (actor.ActorID == actorID) {
+                    return actor;
+                }
+            }
+
+            foreach (Actor actor in m_SpawnedActors) {
+                if (actor.ActorID == actorID) {
+                    return actor;
+                }
+            }
+
+            return null;
+        }
+
+        public void SpawnActor(AssetReferenceGameObject assetReference, Vector3 position, Quaternion rotation) {
+            if (!IsServer) {
+                s_Logger.Error("Only the server can spawn actors.");
+                return;
+            }
+
+            if (!assetReference.RuntimeKeyIsValid()) {
+                s_Logger.Error("Trying to spawn an actor with an invalid asset reference.");
+                return;
+            }
+
+            GameObject actorObject = assetReference.InstantiateAsync(position, rotation).WaitForCompletion();
+            Actor actor = actorObject.GetComponent<Actor>();
+            if (actor is null) {
+                s_Logger.Error($"GameObject {actorObject.name} does not have an Actor component.");
+                Destroy(actorObject);
+                return;
+            }
+
+            actor.SourceActorPath = assetReference.AssetGUID;
+            actor.ActorID = UniqueID.NewULongFromGuid();
+            actor.Data = actor.InternalCreateActorData();
+
+            m_SpawnedActors.Add(actor);
+
+            NativeArray<byte> stateData = SerializeActorState(actor);
+            SpawnActorRpc(assetReference.AssetGUID, actor.ActorID, position, rotation, stateData, RpcTarget.NotMe);
+        }
+
+        // @NOTE: This RPC is used to spawn actors on clients.
+        [Rpc(SendTo.SpecifiedInParams)]
+        void SpawnActorRpc(string guid,
+                           ulong actorID,
+                           Vector3 position,
+                           Quaternion rotation,
+                           NativeArray<byte> stateData,
+                           RpcParams rpcParams) {
+            AssetReferenceGameObject assetReference = new AssetReferenceGameObject(guid);
+            if (!assetReference.RuntimeKeyIsValid()) {
+                s_Logger.Error($"Invalid asset reference for actor with GUID {guid}");
+                return;
+            }
+
+            GameObject actorObject = assetReference.InstantiateAsync(position, rotation).WaitForCompletion();
+            if (actorObject == null) {
+                s_Logger.Error($"Failed to instantiate actor with GUID {guid}");
+                return;
+            }
+
+            Actor actor = actorObject.GetComponent<Actor>();
+            if (actor is null) {
+                s_Logger.Error($"GameObject {actorObject.name} does not have an Actor component.");
+                Destroy(actorObject);
+                return;
+            }
+
+            actor.SourceActorPath = guid;
+            actor.ActorID = actorID;
+            actor.Data = actor.InternalCreateActorData();
+
+            DeserializeActorState(actor, stateData);
+            m_SpawnedActors.Add(actor);
+        }
+
+        public void KillActor(Actor actor) {
+            if (!IsServer) {
+                s_Logger.Error("Only the server can kill actors.");
+                return;
+            }
+
+            if (actor is null) {
+                s_Logger.Error("Trying to kill a null actor.");
+                return;
+            }
+
+            if (!m_SpawnedActors.Remove(actor)) {
+                s_Logger.Error($"Trying to kill an actor that is not registered: {actor.name}. " +
+                               "Remember you can only kill actors spawned that are dynamically created");
+                return;
+            }
+
+            Destroy(actor.gameObject);
+        }
+    }
+}

Runtime/Engine/Code/Simulation/ActorsManager.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: af0c5ff8ac4945eca2a9cab0a88268f4
+timeCreated: 1751411111

Runtime/Engine/Code/Simulation/Sensors/ISensor.cs

@@ -4,4 +4,8 @@ namespace RebootKit.Engine.Simulation.Sensors {
     public interface ISensor {
         GameObject Sense();
     }
+
+    public interface ISensor<out T> where T : class {
+        T Sense();
+    }
 }

Runtime/Engine/Code/Simulation/WorldService.cs

@@ -4,6 +4,7 @@ using Cysharp.Threading.Tasks;
 using RebootKit.Engine.Foundation;
 using RebootKit.Engine.Main;
 using RebootKit.Engine.Services.Simulation;
+using Unity.Netcode;
 using UnityEngine;
 using UnityEngine.AddressableAssets;
 using UnityEngine.Assertions;
@@ -28,13 +29,18 @@ namespace RebootKit.Engine.Simulation {
         WorldConfig m_Config;
         AsyncOperationHandle<SceneInstance> m_SceneInstance;
         
-        struct ActorData {
+        enum ActorOrigin {
-            public Actor Actor;
+            InScene,
-            public readonly bool ManagedByAddressables;
+            Prefab
+        }
 
-            public ActorData(Actor actor, bool managedByAddressables) {
+        struct ActorData {
+            public ActorOrigin Origin;
+            public Actor Actor;
+            
+            public ActorData(ActorOrigin origin, Actor actor) {
+                Origin = origin;
                 Actor = actor;
-                ManagedByAddressables = managedByAddressables;
             }
         }
 
@@ -69,6 +75,8 @@ namespace RebootKit.Engine.Simulation {
             await m_SceneInstance.Result.ActivateAsync();
             SceneManager.SetActiveScene(m_SceneInstance.Result.Scene);
             
+            // await UniTask.WaitWhile(() => RR.CoreNetworkGameSystemsInstance is null, cancellationToken: cancellationToken);
+            
             foreach (GameObject root in m_SceneInstance.Result.Scene.GetRootGameObjects()) {
                 if (root.TryGetComponent(out IWorldContext worldContext)) {
                     Assert.IsNull(Context,
@@ -77,15 +85,11 @@ namespace RebootKit.Engine.Simulation {
                 }
 
                 foreach (Actor actor in root.GetComponentsInChildren<Actor>()) {
-                    m_Actors.Add(new ActorData(actor, false));
+                    RR.NetworkSystemInstance.Actors.RegisterInSceneActor(actor);
                 }
             }
 
             m_WorldState = WorldState.Loaded;
-
-            if (RR.GameInstance is not null) {
-                RR.GameInstance.OnWorldLoaded();
-            }
         }
 
         public void Unload() {
@@ -93,12 +97,10 @@ namespace RebootKit.Engine.Simulation {
                 return;
             }
 
-            if (RR.GameInstance is not null) {
+            if (RR.NetworkSystemInstance is not null) {
-                RR.GameInstance.OnWorldUnload();
+                RR.NetworkSystemInstance.Actors.CleanUp();
             }
             
-            KillAllActors();
-
             if (m_SceneInstance.IsValid()) {
                 m_SceneInstance.Release();
                 m_SceneInstance = default;
@@ -107,79 +109,5 @@ namespace RebootKit.Engine.Simulation {
             m_WorldState = WorldState.Unloaded;
             Context = null;
         }
-
-        public async UniTask<TActor> SpawnActor<TActor>(AssetReferenceT<GameObject> asset,
-                                                        CancellationToken cancellationToken) where TActor : Actor {
-            if (m_WorldState != WorldState.Loaded) {
-                s_Logger.Error("World is not loaded. Cannot spawn actor.");
-                return null;
-            }
-
-            GameObject gameObject = await Addressables.InstantiateAsync(asset);
-            if (cancellationToken.IsCancellationRequested) {
-                asset.ReleaseInstance(gameObject);
-                return null;
-            }
-
-            if (gameObject.TryGetComponent(out TActor actor)) {
-                actor.OnSpawned();
-                actor.IsPlaying = true;
-                m_Actors.Add(new ActorData(actor, true));
-                return actor;
-            }
-
-            asset.ReleaseInstance(gameObject);
-            return null;
-        }
-
-        public void KillActor(Actor actor) {
-            ActorData actorData = default;
-            bool found = false;
-            for (int i = m_Actors.Count - 1; i >= 0; i--) {
-                if (m_Actors[i].Actor == actor) {
-                    found = true;
-                    actorData = m_Actors[i];
-                    m_Actors.RemoveAt(i);
-                    break;
-                }
-            }
-            Assert.IsTrue(found, $"Actor {actor.name} not found in the world actors list.");
-
-            actor.IsPlaying = false;
-            actor.OnDespawned();
-
-            if (actorData.ManagedByAddressables) {
-                Addressables.ReleaseInstance(actor.gameObject);
-            }
-        }
-
-        public void KillAllActors() {
-            foreach (ActorData actorData in m_Actors) {
-                actorData.Actor.IsPlaying = false;
-                actorData.Actor.OnDespawned();
-
-                if (actorData.ManagedByAddressables) {
-                    Addressables.ReleaseInstance(actorData.Actor.gameObject);
-                } else {
-                    UnityEngine.Object.Destroy(actorData.Actor.gameObject);
-                }
-            }
-
-            m_Actors.Clear();
-        }
-
-        public void Tick(float deltaTime) {
-            if (m_WorldState != WorldState.Loaded) {
-                return;
-            }
-            
-            foreach (ActorData actorData in m_Actors) {
-                Actor actor = actorData.Actor;
-                
-                if (actor.IsPlaying) {
-                    actor.Tick(deltaTime);
-                }
-            }
-        }
     }
 }

Runtime/Engine/Resources/RebootKit/core_network_game_systems.prefab

@@ -0,0 +1,87 @@
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Runtime/Engine/Resources/RebootKit/core_network_game_systems.prefab.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
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Runtime/Engine/core_assets/boot/scn_boot.unity

@@ -421,7 +421,7 @@ MonoBehaviour:
   NetworkManagerExpanded: 0
   NetworkConfig:
     ProtocolVersion: 0
-    NetworkTransport: {fileID: 1456272201}
+    NetworkTransport: {fileID: 1456272198}
     PlayerPrefab: {fileID: 0}
     Prefabs:
       NetworkPrefabsLists:
@@ -434,7 +434,7 @@ MonoBehaviour:
     TimeResyncInterval: 30
     EnsureNetworkVariableLengthSafety: 0
     EnableSceneManagement: 0
-    ForceSamePrefabs: 1
+    ForceSamePrefabs: 0
     RecycleNetworkIds: 1
     NetworkIdRecycleDelay: 120
     RpcHashSize: 0