Other players getting the name of the player that killed them

Unity Courses Ask
,
#1

Hello everybody,
So this problem appeared probably a while ago, but i noticed it now. so if the first build with name (Build1) kills the second build (build2), then build2 will become build1 and now there is two build1s in the game (overhead names change too) i dont know what script is related to this issue but here is some scripts:
Leaderboard

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Unity.Netcode;
using UnityEngine;

public class Leaderboard : NetworkBehaviour
{
    [SerializeField] private Transform leaderboardEntityHolder;
    [SerializeField] private LeaderboardEntityDisplay leaderboardEntityPrefab;
    [SerializeField] private int entitiesToDisplay = 8;

    private NetworkList<LeaderboardEntityState> leaderboardEntities;
    private List<LeaderboardEntityDisplay> entityDisplays = new List<LeaderboardEntityDisplay>();

    private void Awake()
    {
        leaderboardEntities = new NetworkList<LeaderboardEntityState>();
    }

    public override void OnNetworkSpawn()
    {
        if (IsClient)
        {
            leaderboardEntities.OnListChanged += HandleLeaderboardEntitiesChanged;
            foreach (LeaderboardEntityState entity in leaderboardEntities)
            {
                HandleLeaderboardEntitiesChanged(new NetworkListEvent<LeaderboardEntityState>
                {
                    Type = NetworkListEvent<LeaderboardEntityState>.EventType.Add,
                    Value = entity
                });
            }
        }

        if (IsServer)
        {
            TankPlayer[] players = FindObjectsByType<TankPlayer>(FindObjectsSortMode.None);
            foreach (TankPlayer player in players)
            {
                HandlePlayerSpawned(player);
            }

            TankPlayer.OnPlayerSpawned += HandlePlayerSpawned;
            TankPlayer.OnPlayerDespawned += HandlePlayerDespawned;
        }
    }

    public override void OnNetworkDespawn()
    {
        if (IsClient)
        {
            leaderboardEntities.OnListChanged -= HandleLeaderboardEntitiesChanged;
        }

        if (IsServer)
        {
            TankPlayer.OnPlayerSpawned -= HandlePlayerSpawned;
            TankPlayer.OnPlayerDespawned -= HandlePlayerDespawned;
        }
    }

    private void HandleLeaderboardEntitiesChanged(NetworkListEvent<LeaderboardEntityState> changeEvent)
    {
        switch (changeEvent.Type)
        {
            case NetworkListEvent<LeaderboardEntityState>.EventType.Add:
                if (!entityDisplays.Any(x => x.ClientId == changeEvent.Value.ClientId))
                {
                    LeaderboardEntityDisplay leaderboardEntity =
                        Instantiate(leaderboardEntityPrefab, leaderboardEntityHolder);
                    leaderboardEntity.Initialise(
                        changeEvent.Value.ClientId,
                        changeEvent.Value.PlayerName,
                        changeEvent.Value.Coins);
                    entityDisplays.Add(leaderboardEntity);
                }
                break;
            case NetworkListEvent<LeaderboardEntityState>.EventType.Remove:
                LeaderboardEntityDisplay displayToRemove =
                    entityDisplays.FirstOrDefault(x => x.ClientId == changeEvent.Value.ClientId);
                if (displayToRemove != null)
                {
                    displayToRemove.transform.SetParent(null);
                    Destroy(displayToRemove.gameObject);
                    entityDisplays.Remove(displayToRemove);
                }
                break;
            case NetworkListEvent<LeaderboardEntityState>.EventType.Value:
                LeaderboardEntityDisplay displayToUpdate =
                    entityDisplays.FirstOrDefault(x => x.ClientId == changeEvent.Value.ClientId);
                if (displayToUpdate != null)
                {
                    displayToUpdate.UpdateCoins(changeEvent.Value.Coins);
                }
                break;
        }

        entityDisplays.Sort((x, y) => y.Coins.CompareTo(x.Coins));

        for (int i = 0; i < entityDisplays.Count; i++)
        {
            entityDisplays[i].transform.SetSiblingIndex(i);
            entityDisplays[i].UpdateText();
            entityDisplays[i].gameObject.SetActive(i <= entitiesToDisplay - 1);
        }

        LeaderboardEntityDisplay myDisplay =
            entityDisplays.FirstOrDefault(x => x.ClientId == NetworkManager.Singleton.LocalClientId);

        if (myDisplay != null)
        {
            if (myDisplay.transform.GetSiblingIndex() >= entitiesToDisplay)
            {
                leaderboardEntityHolder.GetChild(entitiesToDisplay - 1).gameObject.SetActive(false);
                myDisplay.gameObject.SetActive(true);
            }
        }
    }

    private void HandlePlayerSpawned(TankPlayer player)
    {
        leaderboardEntities.Add(new LeaderboardEntityState
        {
            ClientId = player.OwnerClientId,
            PlayerName = player.PlayerName.Value,
            Coins = 0
        });

        player.Wallet.TotalCoins.OnValueChanged += (oldCoins, newCoins) =>
            HandleCoinsChanged(player.OwnerClientId, newCoins);
    }

    private void HandlePlayerDespawned(TankPlayer player)
    {
        foreach (LeaderboardEntityState entity in leaderboardEntities)
        {
            if (entity.ClientId != player.OwnerClientId) { continue; }

            leaderboardEntities.Remove(entity);
            break;
        }

        player.Wallet.TotalCoins.OnValueChanged -= (oldCoins, newCoins) =>
            HandleCoinsChanged(player.OwnerClientId, newCoins);
    }

    private void HandleCoinsChanged(ulong clientId, int newCoins)
    {
        for (int i = 0; i < leaderboardEntities.Count; i++)
        {
            if (leaderboardEntities[i].ClientId != clientId) { continue; }

            leaderboardEntities[i] = new LeaderboardEntityState
            {
                ClientId = leaderboardEntities[i].ClientId,
                PlayerName = leaderboardEntities[i].PlayerName,
                Coins = newCoins
            };

            return;
        }
    }
}

LeaderboardEntityDisplay

using System.Collections;
using System.Collections.Generic;
using TMPro;
using Unity.Collections;
using Unity.Netcode;
using UnityEngine;
using UnityEngine.UI;

public class LeaderboardEntityDisplay : MonoBehaviour
{
    [SerializeField] private Color myNameColor;
    [SerializeField] private Color topOneColor;
    [SerializeField] private Color topTwoColor;
    [SerializeField] private Color topThreeColor;
    [SerializeField] private Color otherTopColor;
    [SerializeField] private TMP_Text playerNameText;
    [SerializeField] private TMP_Text placeText;
    [SerializeField] private TMP_Text scoreText;
    [SerializeField] private Image placeBackground;

    private FixedString32Bytes playerName;

    public ulong ClientId { get; private set; }
    public int Coins { get; private set; }

    public void Initialise(ulong clientId, FixedString32Bytes playerName, int coins)
    {
        ClientId = clientId;
        this.playerName = playerName;

        if (clientId == NetworkManager.Singleton.LocalClientId)
        {
            playerNameText.color = myNameColor;
        }

        UpdateCoins(coins);
    }

    public void UpdateText()
    {
        if (transform.GetSiblingIndex() + 1 == 1)
        {
            placeBackground.color = topOneColor;
        }
        else if (transform.GetSiblingIndex() + 1 == 2)
        {
            placeBackground.color = topTwoColor;
        }
        else if (transform.GetSiblingIndex() + 1 == 3)
        {
            placeBackground.color = topThreeColor;
        }
        else
        {
            placeBackground.color = otherTopColor;
        }

        placeText.text = (transform.GetSiblingIndex() + 1).ToString();
        playerNameText.text = playerName.ToString();
        scoreText.text = Coins.ToString();
    }

    public void UpdateCoins(int coins)
    {
        Coins = coins;
        UpdateText();
    }
}

RespawnHandle (because its related to death)

using System;
using System.Collections;
using System.Collections.Generic;
using Unity.Netcode;
using UnityEngine;

public class RespawnHandler : NetworkBehaviour
{
    [SerializeField] private NetworkObject playerPrefab;

    public override void OnNetworkSpawn()
    {
        if (!IsServer) { return; }

        TankPlayer[] players = FindObjectsOfType<TankPlayer>();
        foreach (TankPlayer player in players)
        {
            HandlePlayerSpawned(player);
        }

        TankPlayer.OnPlayerSpawned += HandlePlayerSpawned;
        TankPlayer.OnPlayerDespawned += HandlePlayerDespawned;
    }

    public override void OnNetworkDespawn()
    {
        if (!IsServer) { return; }

        TankPlayer.OnPlayerSpawned -= HandlePlayerSpawned;
        TankPlayer.OnPlayerDespawned -= HandlePlayerDespawned;
    }

    private void HandlePlayerSpawned(TankPlayer player)
    {
        player.Health.OnDie += (health) => HandlePlayerDie(player);
    }

    private void HandlePlayerDespawned(TankPlayer player)
    {
        player.Health.OnDie -= (health) => HandlePlayerDie(player);
    }

    private void HandlePlayerDie(TankPlayer player)
    {
        Destroy(player.gameObject);

        StartCoroutine(RespawnPlayer(player.OwnerClientId));
    }

    private IEnumerator RespawnPlayer(ulong ownerClientId)
    {
        yield return null;

        NetworkObject playerInstance = Instantiate(
            playerPrefab, SpawnPoint.GetRandomSpawnPos(), Quaternion.identity);

        playerInstance.SpawnAsPlayerObject(ownerClientId);
    }
}

Health

using System;
using System.Collections;
using System.Collections.Generic;
using Unity.Netcode;
using UnityEngine;

public class Health : NetworkBehaviour
{
    [field: SerializeField] public int MaxHealth { get; private set; } = 100;

    public NetworkVariable<int> CurrentHealth = new NetworkVariable<int>();

    private bool isDead;

    public Action<Health> OnDie;

    public override void OnNetworkSpawn()
    {
        if (!IsServer) { return; }

        CurrentHealth.Value = MaxHealth;
    }

    public void TakeDamage(int damageValue)
    {
        ModifyHealth(-damageValue);
    }

    public void RestoreHealth(int healValue)
    {
        ModifyHealth(healValue);
    }

    private void ModifyHealth(int value)
    {
        if (isDead) { return; }

        int newHealth = CurrentHealth.Value + value;
        CurrentHealth.Value = Mathf.Clamp(newHealth, 0, MaxHealth);

        if(CurrentHealth.Value == 0)
        {
            OnDie?.Invoke(this);
            isDead = true;
        }
    }
}

TankPlayer

using System.Collections;
using System.Collections.Generic;
using Unity.Netcode;
using UnityEngine;
using Cinemachine;
using Unity.Collections;
using System;

public class TankPlayer : NetworkBehaviour
{
    [Header("References")]
    [SerializeField] private CinemachineVirtualCamera virtualCamera;
    [field: SerializeField] public Health Health { get; private set; }
    [field: SerializeField] public CoinWallet Wallet { get; private set; }

    [Header("Settings")]
    [SerializeField] private int ownerPriority = 15;

    public NetworkVariable<FixedString32Bytes> PlayerName = new NetworkVariable<FixedString32Bytes>();

    public static event Action<TankPlayer> OnPlayerSpawned;
    public static event Action<TankPlayer> OnPlayerDespawned;

    public override void OnNetworkSpawn()
    {
        if (IsServer)
        {
            UserData userData =
                HostSingleton.Instance.GameManager.NetworkServer.GetUserDataByClientId(OwnerClientId);

            PlayerName.Value = userData.userName;

            OnPlayerSpawned?.Invoke(this);
        }

        if (IsOwner)
        {
            virtualCamera.Priority = ownerPriority;
        }
    }

    public override void OnNetworkDespawn()
    {
        if (IsServer)
        {
            OnPlayerDespawned?.Invoke(this);
        }
    }
}

If you need any other script tell me, please help.

#2

Hi there,
Sorry, I am not totally clear on the issue you are having. In what context are you trying to get the name of the player that killed you? I don’t think that was a feature in the course. Is this an addition you made where you are trying to display the name of he player who killed you?

Can you also explain the error further? What do you me by “build2 will become build1”? Are you overwriting the player name.

#3

What the OP is saying is that when a player dies and respawns, that player now has the same name as the player that killed them. This suggests this line in TankPlayer is getting the wrong data

UserData userData = HostSingleton.Instance.GameManager.NetworkServer.GetUserDataByClientId(OwnerClientId);
#4

Ah, thanks I am following now.
My guess would be that the RespawnPlayer method in the RespawnHandler, is assigning the wrong ownerClientId to the TankPlayer during respawning.
Tracing that backwards we are getting the ownerClientId in the following manner:
In ModifyHealth we call the OnDie event and pass the Health object into the event. In the respawnHandler, we listen to that event and pass the player associated with that health into the HandlePlayerDie method. From there we are passing the player.OwnerClientId into the Respawn coroutine, where it is used to spawn the new player object.

Where your code differs from the course code is in the RespawnHandler and the RespawnPlayer routine. You are storing the player prefab as a NetworkObject directly as opposed to the TankPlayer class. I’m not sure if that would effect anything, but you can try updating it to see if it makes a difference. It should be referencing the same NetworkObject.

#5

This was later changed in the course, i changed it from NetworkObject to TankPlayer, but nothing changed. but i think this is not a code problem. this bug is not happening between the editor and the build, its happening only between two builds, sometimes i connect the first build as build1 and connect the other build as build2, but in the game there both have the name “build2” i think thats because they share the same playerprefs or something like that.

#6

That would make sense actually (that they are sharing the same player prefs). If you test it on two separate computers or one in the Editor one in the build does the bug still happen?

#7

Recently tested it with my friend and it worked just fine! Thank you :+1:

1 Like
#8
#9
#10

Privacy & Terms