The Ultimate Multiplayer Tutorial for Unity - Netcode for GameObjects 

Can you please provide minute mark of this bug?

You can add this at any time, it’s just so that when a new player joins it can spawn the tails of the other players if they had already grown in length. The section before 1:10:03

Could you pls leave here a document/text with the ObjectNetworkPool script? The original document was updated and is complete different of the one shown in the video, it does not even have an InitializePool function. That would be really helpful

@@mathinho_ns Here you go. Also before spawning object make sure to do if (!obj.IsSpawned) obj.Spawn(true); And when despawning you can just do if (NetworkObject.IsSpawned) NetworkObject.Despawn();, and not Destroy it. using System; using System.Collections.Generic; using System.Runtime.CompilerServices; using Unity.Netcode; using UnityEngine; using UnityEngine.Assertions; /// /// Object Pool for networked objects, used for controlling how objects are spawned by Netcode. Netcode by default will allocate new memory when spawning new /// objects. With this Networked Pool, we're using custom spawning to reuse objects. /// Boss Room uses this for projectiles. In theory it should use this for imps too, but we wanted to show vanilla spawning vs pooled spawning. /// Hooks to NetworkManager's prefab handler to intercept object spawning and do custom actions /// public class NetworkObjectPool : NetworkBehaviour { private static NetworkObjectPool _instance; public static NetworkObjectPool Singleton { get { return _instance; } } [SerializeField] List PooledPrefabsList; HashSet prefabs = new HashSet(); private Dictionary pooledObjects = new Dictionary(); private Dictionary nonPooledObjects = new Dictionary(); private bool m_HasInitialized = false; public void Awake() { if (_instance != null && _instance != this) { Destroy(this.gameObject); } else { _instance = this; } } public override void OnNetworkSpawn() { InitializePool(); } public override void OnNetworkDespawn() { ClearPool(); } public void OnValidate() { for (var i = 0; i < PooledPrefabsList.Count; i++) { var prefab = PooledPrefabsList[i].Prefab; if (prefab != null) { Assert.IsNotNull(prefab.GetComponent(), $"{nameof(NetworkObjectPool)}: Pooled prefab \"{prefab.name}\" at index {i.ToString()} has no {nameof(NetworkObject)} component."); } } } /// /// Gets an instance of the given prefab from the pool. The prefab must be registered to the pool. /// /// /// public NetworkObject GetNetworkObject(GameObject prefab) { return GetNetworkObjectInternal(prefab, Vector3.zero, Quaternion.identity); } /// /// Gets an instance of the given prefab from the pool. The prefab must be registered to the pool. /// /// /// The position to spawn the object at. /// The rotation to spawn the object with. /// public NetworkObject GetNetworkObject(GameObject prefab, Vector3 position, Quaternion rotation) { return GetNetworkObjectInternal(prefab, position, rotation); } /// /// Return an object to the pool (reset objects before returning). /// public void ReturnNetworkObject(NetworkObject networkObject, GameObject prefab) { // Debug.Log("Returning Object"); var go = networkObject.gameObject; go.SetActive(false); pooledObjects[prefab].Enqueue(networkObject); nonPooledObjects[prefab]--; } /// /// Returns how many of the specified prefab have been instantiated but are not in the pool. /// public int GetCurrentPrefabCount(GameObject prefab) { return nonPooledObjects[prefab]; } /// /// Adds a prefab to the list of spawnable prefabs. /// /// The prefab to add. /// public void AddPrefab(GameObject prefab, int prewarmCount = 0) { var networkObject = prefab.GetComponent(); Assert.IsNotNull(networkObject, $"{nameof(prefab)} must have {nameof(networkObject)} component."); Assert.IsFalse(prefabs.Contains(prefab), $"Prefab {prefab.name} is already registered in the pool."); RegisterPrefabInternal(prefab, prewarmCount); } /// /// Builds up the cache for a prefab. /// private void RegisterPrefabInternal(GameObject prefab, int prewarmCount) { prefabs.Add(prefab); var prefabQueue = new Queue(); pooledObjects[prefab] = prefabQueue; for (int i = 0; i < prewarmCount; i++) { var go = CreateInstance(prefab); ReturnNetworkObject(go.GetComponent(), prefab); } // Register Netcode Spawn handlers NetworkManager.Singleton.PrefabHandler.AddHandler(prefab, new PooledPrefabInstanceHandler(prefab, this)); } [MethodImpl(MethodImplOptions.AggressiveInlining)] private GameObject CreateInstance(GameObject prefab) { return Instantiate(prefab); } /// /// This matches the signature of /// /// /// /// /// private NetworkObject GetNetworkObjectInternal(GameObject prefab, Vector3 position, Quaternion rotation) { var queue = pooledObjects[prefab]; NetworkObject networkObject; if (queue.Count > 0) { networkObject = queue.Dequeue(); } else { networkObject = CreateInstance(prefab).GetComponent(); } nonPooledObjects[prefab]++; // Here we must reverse the logic in ReturnNetworkObject. var go = networkObject.gameObject; go.SetActive(true); go.transform.position = position; go.transform.rotation = rotation; return networkObject; } /// /// Registers all objects in to the cache. /// public void InitializePool() { if (m_HasInitialized) return; foreach (var configObject in PooledPrefabsList) { nonPooledObjects[configObject.Prefab] = 0; RegisterPrefabInternal(configObject.Prefab, configObject.PrewarmCount); nonPooledObjects[configObject.Prefab] = 0; } m_HasInitialized = true; } /// /// Unregisters all objects in from the cache. /// public void ClearPool() { foreach (var prefab in prefabs) { // Unregister Netcode Spawn handlers NetworkManager.Singleton.PrefabHandler.RemoveHandler(prefab); } pooledObjects.Clear(); } } [Serializable] struct PoolConfigObject { public GameObject Prefab; public int PrewarmCount; } class PooledPrefabInstanceHandler : INetworkPrefabInstanceHandler { GameObject m_Prefab; NetworkObjectPool m_Pool; public PooledPrefabInstanceHandler(GameObject prefab, NetworkObjectPool pool) { m_Prefab = prefab; m_Pool = pool; } NetworkObject INetworkPrefabInstanceHandler.Instantiate(ulong ownerClientId, Vector3 position, Quaternion rotation) { var netObject = m_Pool.GetNetworkObject(m_Prefab, position, rotation); return netObject; } void INetworkPrefabInstanceHandler.Destroy(NetworkObject networkObject) { m_Pool.ReturnNetworkObject(networkObject, m_Prefab); } }

@@samyam Very Very thank you

Thank you 🙏☺️

mana valley coop mode?? thx 😁

But how did you figure it out? Since you did this 2 months ago, you were using a different NetworkObjectPool.cs than in the video.

Thank you!

Thanks so much! 😁

Thank you! 😄

Thank you! It confused me too at first and no one seemed to explain it well for me to understand

Thank you!

how? pleasee...how to create that network prefabs list scriptable object? i have no clue, since mine didnt have any features to do that

thank you! ☺️

Thanks! I considered it but I thought it might be annoying in a tutorial to have it pop up constantly. I’ll think about it!

@@samyam Oh! That makes sense. I guess that would be a ton of pop ups 😅

Glad I can help 😄

How did you figure it out when using a different NetworkObjectPool.cs than she has in the video?

I noticed same bug and end up modify it to while(true) for the food spawner works without breaking.

I’m not familiar with that ad 😂

Omg this is so useful thank you!

Thank you so much!

Thanks!

i cant seem to find where that is located

Are you saying when we place the line "NetworkObjectPool.Singleton.InitializePool();" that can be ignored? Or does it need to be replaced with "NetworkObjectPool.Singleton.RegisterPrefabInternal(prefab, 30);" as I saw someone else suggest? In that instance, RegisterPrefabInternal() would also have to be changed to 'public.'

@@christophergraf5929 You can just delete the line "NetworkObjectPool.Singleton.InitializePool();" because in the updated version the initialization is already carried out with the OnNetworkSpawn method public override void OnNetworkSpawn() { // Registers all objects in PooledPrefabsList to the cache. foreach (var configObject in PooledPrefabsList) { RegisterPrefabInternal(configObject.Prefab, configObject.PrewarmCount); } }

thank you! 😁

Of course they update it right after my tutorial 😂 From the description it seems that you just have to make the object a prefab with the NetworkObject component attached and it will work, which is honestly better in the long-run.

@@samyam Honestly I believe it was because I started working through this video. I feel like everytime I start to learn Netcode with Unity, an update happens that breaks it and I quit. I tried to put it into the default Network Prefabs list, however, it does not seem to spawn them on start. My newb guess would be something along the lines of being in a list and needing to be called from the list now instead of just spawning, but I am so new to this I won't find the answer for at least another month or two after my knowledge catches up... to this one little problem. :D

Don’t lose hope! If anything join our Discord in the description and ask in the help channel!

@@samyam I think you're right, you just add it to the list and it worked. I had another issue due to upgrades and stuff. It randomly fixed itself, so I can't tell you what was wrong or how I fixed it so I will chalk it up to rebooting 3 times.

currently it's 1.5.2v of Netcode and i can't go further from 25 min because of the list of NetcodeGameobjects.. will wait for somebody to make a new tutorial as i really want to learn multiplayer part, and seems like there are many changes made in this 6 month. But like and subscribe is yours ))

Thanks for the tip!

I tried Photon once years ago but I haven't tried it recently!

Yes i’m the next video of this i’ll show how to use UGS and matchmaker which will manage this for you

@@samyam Thank you so much. But when can we expect that video ?

@@RizuHaque Most likely in April :) If you are in a hurry check out CodeMonkey’s recent videos

what do you think mate use your fuckin brain

Solution: In the project file, right click, Netcode, make the NetworkPrefabList SO, put your GO there, and put this SO on the Network Manager

I had the same issue. Actually I made an almost 200-line comment explaining how to get around that. But it seems that my comment got filtered out by the spam filter. Let's see if it makes through.

For that particular line that you mentioned I did this instead: NetworkObjectPool.Singleton.RegisterPrefabInternal(prefab, 30);

@@richardgomes7d thank you, it works. i want to ask one more question how did you find the right code

@@abdulkadiraktas5529 On the link samyam provided, it took me to the GitHub page and there, not only you can see the latest code, but also the changes made to the file through the weeks.

Samyam added it to the links in the description. It is titled Networked Object Pooling.

Im having the same problem

You can make a Network Prefab List in your Assets by Right Clicking > Create >Netcode> Network Prefabs List I believe and put the prefabs you want in there, then you can put that list into your network manager

@@samyam thanks

@@samyam thank you so much that's exactly what I was looking for

Yes of course! It's a great networking library and their Unity Gaming Services platform makes hosting and scaling very easy! Disclaimer: I've only previously tried Photon back in the day. However, I found this library very easy to get started with and a lot of customization options.

​@@samyam Ok, I'm asking bc a couple weeks ago I was about to add a multiplayer mode to my Game and I was watching your video. As soon as I realised that you were sponsored by Unity I immediately searched for a different solution and ended up using Mirror. I think I was just expecting to get the best multiplayer solution for Unity from watching your video (Not saying that its your fault that I had these expectations). So its a bit like going into an apple store and asking if I should buy a windows pc or a mac book. You know what I mean?

You can use whichever solution you deem fit for your games, but you shouldn’t not use a solution just because someone made a sponsored video on it. You should do your own research and decide which one fits your use case or style better :)

@@samyam I‘m sure your solution would have been faster to implement. But, and please correct if I‘m wrong, in the end I would have to pay money with the Unity solution. The solution I ended up using isn‘t free either but its included in the steam fee that I already payed. In retrospect I maybe should have finished watching your video instead of running away immediately

Their Netcode for GameObjects library is free, if you want to host your multiplayer game on their Unity Gaming Services dedicated server then you’d have to pay for the server costs (they have a free tier to start). But you can also choose to integrate it with Steam’s Transport layer. Netcode is just a high level abstraction for networking and syncing logic, hosting is up to you. They let you customize it for your uses as you need.

Thanks Valem! 😄

you can use Unity Relay P2P to test or set up a dedicated server How to Setup Dedicated Server Hosting and Matchmaking for Unity ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FjOZrSPL_-Y.html

Thank you!! Hard to tell without seeing the console, what Unity version and Cinemachine version do you use? You can join our Discord and ask in the help chat 😁

@@samyam Sure I'll do that

Also, can we ALWAYS get the collided pplayers ClientOwnerId this way? but taking from a networkbehaviour class?

Of course it's good and work fine but increases the complexity

Not familiar with ReactiveUI