MLAPI spawn player prefab

Question

I am trying to load PlayerPrefabs manually. My game starts in a MainMenu scene, first player hosts, server starts, a new scene loads, player prefab spawns in and everything seems to work fine. When I join as a client, I can't get the second player prefab to spawn, but I do connect and see the 1st player moving around. I am running this script in an object placed in the scene.

  public class GameSceneManager : NetworkBehaviour
 {
            private void Start()
         {
             // get spawn points
             _spawnPoints = GameObject.FindGameObjectsWithTag("playerSpawn");
 
             SpawnPlayerServerRpc();
     
         }
         private Transform GetSpawnPoint()
         {
             if (_spawnPoints.Length == 0) { return null; }
     
             if (NetworkManager.Singleton.IsHost)
             {
                 return _spawnPoints[0].transform;
             }
             else
             {
                 ulong id = NetworkManager.Singleton.LocalClientId;
                 int count = (int)(id - 1);
     
                 return _spawnPoints[count].transform;
             }
         }
     
         [ServerRpc]
             public void SpawnPlayerServerRpc(ulong clientId)
             {
                 Transform spawn = GetSpawnPoint();
     
                 GameObject go = Instantiate(_playerPrefab, spawn.position, spawn.rotation);
                 go.GetComponent<NetworkObject>().SpawnAsPlayerObject(OwnerClientId);
                 ulong objectId = go.GetComponent<NetworkObject>().NetworkObjectId;
     
                 SpawnClientRpc(objectId);
             }
         
             [ClientRpc]
             private void SpawnClientRpc(ulong objectId)
             {
                 NetworkObject player = NetworkSpawnManager.SpawnedObjects[objectId];
             }

I get this error: Trying to destroy object 0 but it doesn't seem to exist anymore! UnityEngine.Debug:LogWarning (object) MLAPI.Spawning.NetworkSpawnManager:OnDestroyObject (ulong,bool) (at Library/PackageCache/com.unity.multiplayer.mlapi@0.1.0/Runtime/Spawning/NetworkSpawnManager.cs:660) MLAPI.NetworkObject:OnDestroy () (at Library/PackageCache/com.unity.multiplayer.mlapi@0.1.0/Runtime/Core/NetworkObject.cs:366)

Answer 1

I got it working. If anyone else is having same issue or just curious, what I did not understand was that the GameObject I was trying to spawn from, was a NetworkObject that was owned by the Host(1st player to log on), so even if I used NetworkManager.Singleton.LocalClientId; it would return the Host clientId instead of the new player that was calling it. I just called the method and sent the localId from another script that was MonoBehaviour (not a NetworkObject), I know this needs work, but it's working for now:

 public class NetworkPlayerSpawner : NetworkBehaviour
 {
 
     [SerializeField] private GameObject _playerPrefab = null;

     void Start()
     {
         // get spawn points
         _spawnPoints = GameObject.FindGameObjectsWithTag("playerSpawn");
     }
 
     private Transform GetSpawnPoint()
     {
         // Stop if there are no spawn points in the seen
         if (_spawnPoints.Length == 0) { return null; }
 
         // get number of players
         if (NetworkManager.Singleton.IsHost)
         {
             return _spawnPoints[0].transform;
         }
         else
         {
             ulong id = NetworkManager.Singleton.LocalClientId;
             int count = (int)(id - 1);
             return _spawnPoints[count].transform;
         }
     }
 
     [ServerRpc(RequireOwnership = false)]  
     public void SpawnPlayerServerRpc(ulong clientId)
     {
         // Get Spawn.  Stop if there are no spawn points in the seen
         Transform spawn = GetSpawnPoint();
         if (spawn == null) { Debug.Log("No Spawn Points in Scene!"); return; }
 
         // Spawn on Client
         GameObject go = Instantiate(_playerPrefab, spawn.position, spawn.rotation);
 
 
         Debug.Log("clientId = " + clientId);
         go.GetComponent<NetworkObject>().SpawnAsPlayerObject(clientId);
         ulong objectId = go.GetComponent<NetworkObject>().NetworkObjectId;
 
         SpawnClientRpc(objectId);
 
     }
 
     // A ClientRpc can be invoked by the server to be executed on a client
     [ClientRpc]
     private void SpawnClientRpc(ulong objectId)
     {
         NetworkObject player = NetworkSpawnManager.SpawnedObjects[objectId];
     }
 }

and I just called the method from another script on Start (when the player loads into the scene)

       void Start(){
 
         ulong id = NetworkManager.Singleton.LocalClientId;
         _networkPlayerSpawner.SpawnPlayerServerRpc(id);
 }

Answer 2

Answer by NocSchecter · Sep 27, 2021 at 10:55 PM

Hello!

Could you tell me use a part of your code but all my players are instantiated in the first value of my list containing the spawnpoints.

Do you have the code on the client side? when a client chooses where to position itself instead of the server doing it?

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viknesh2020 · Nov 18, 2021 at 02:43 PM 0

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I think you have to give write permission to the client to change the position variable. Or do a check if it is client or server then change the position value.

MLAPI spawn player prefab

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