MLAPI spawn player prefab

Questions & Answers
1

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)

2

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);
}
3

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?