Third Party Camera issues with Mirror multiplayer

Hello,

I am using the Mirror extension and experimenting with a multiplayer FPS style game. The NetworkManager auto spawns a player prefab when someone joins the game. The player prefab his children transforms most notably a camera.

When client 1 starts a new server and spawns in using the player prefab everything works great. The first person camera works and the controls are great!

However, when client 2 joins the game client 1 is hosting, client 1's view becomes client 2's view. Client 1 is no longer viewing the camera attached to his player prefab. Instead he is viewing the camera attached to client 2's prefab. I am guessing this has to do with client authority and I've done many google searches but I cannot figure out where I have gone wrong! Help would be appreciated.

 

It means you aren't disabling the camera on the player 2 gameobject in player 1's client (and vice versa I assume).

I can't help with specific coding because I don't use Mirror, however, if you post some of the network code for your player objects someone should be able to help if you are still stuck.

 

Thanks for the reply! I came to a conclusion around there but then figured out that the cameras have the same name. So I don't know how to enable or disable if they have the same name... Is there any other object identifiers I could use?

 

There should be a way to determine if the script is running on the owning client or the remote client, in Photon PUN this is achieved by querying photonView.IsMine and disabling the relevant components when it has a value of false.

There is probably an equivalent property in Mirror, but I don't know what it is.

Hopefully, someone familiar with Mirror will chip in and help.

 

It is a bad idea to make your camera part of a networked object's prefab. Just attach your camera to the object which represents that client after it is spawned in, and use an empty GameObject on the prefab as a mount point for the camera. Check for "isLocalPlayer" to determine which one to attach to.

Something like this:

Code (csharp):

1. public GameObject CameraMountPoint;
2.  
3. void Start()
4. {
5.     if (isLocalPlayer)
6.     {
7.         Transform cameraTransform = Camera.main.gameObject.transform;  //Find main camera which is part of the scene instead of the prefab
8.         cameraTransform.parent = CameraMountPoint.transform;  //Make the camera a child of the mount point
9.         cameraTransform.position = CameraMountPoint.transform.position;  //Set position/rotation same as the mount point
10.         cameraTransform.rotation = CameraMountPoint.transform.rotation;
11.     }
12. }

 

Ahh GENIUS! Thanks a lot I'll give it a shot and im sure it will work!

 

Hmm your code seemed right and everything went through with no errors until I launched the game. I got an error talking about a Null Reference Exception and no game object being found. I am not sure whats causing this and I went back through code several times and could not sort it out. Any ideas? Probably being super stupid... I'm a Unity newbie so sorry for taking up your time

 

So there's only two references which can be null there. There is Camera.main, which will find the active camera in the scene with the tag "MainCamera". If there is no active Camera in the scene with that tag, it will return null.
https://docs.unity3d.com/ScriptReference/Camera-main.html

The second is CameraMountPoint. You fill in that field in the inspector on the prefab itself. I would just use your old Camera GameObject that is already a part of the prefab, remove its Camera component, and assign it to that field. If it is not filled in in the Inspector then when you go to use its transform it will generate a null reference exception.

 

Alright yep it was just me not tagging the camera. My bad. Thanks for your help really appreciate the Unity community

 

OMG I had this same issue and this solution worked. Thank you so much!!!

 

for me, for some reason setting parent only worked when i did

Code (CSharp):

1. cameraTransform.SetParent(cameraMountPoint.transform);

 

Hi, i'm sorry for the inconvenience but i'm facing the exact problem.
I've added the code about isLocalPlayer to the player prefab, but if a attach a prefab of an empty gameobject in cameramount i've got an error that says that i can't set the parent of a prefab.
As our player which represents the client is a prefab spawned buy the networkManager, I can't just set an empty gameObject to it.

 

If you're referring to my post from a year ago, I was referring to making the empty GameObject a part of the prefab itself. It also isn't the parent, but a child. Basically it is just used as a mount point for the camera, while not actually including the camera in the prefab.

 

Thanks dude, that worked just fine!

 

It works. It goddamn works. You are a life saver man

 

Hi, I follow your method but I have an issue, when a second player appear on the server, the camera is going in his mountpoint, did I miss a setup ?

 

Are you checking isLocalPlayer first?

 

I did everything u said but my camera won’t mount on the empty game object. Do you know what could’ve gone wrong?

 

You guys have the answer in the mirror examples

just add the script to the player prefab

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using Mirror;
5. using UnityEngine.SceneManagement;
6.  
7. // This sets up the scene camera for the local player
8.  
9. namespace Mirror.Examples.NetworkRoom
10. {
11.     public class PlayerCamera : NetworkBehaviour
12.     {
13.         Camera mainCam;
14.  
15.         void Awake()
16.         {
17.             mainCam = Camera.main;
18.         }
19.  
20.         public override void OnStartLocalPlayer()
21.         {
22.             if (mainCam != null)
23.             {
24.                 // configure and make camera a child of player with 3rd person offset
25.                 mainCam.orthographic = false;
26.                 mainCam.transform.SetParent(transform);
27.                 mainCam.transform.localPosition = new Vector3(0f, 8f, -15f);
28.                 mainCam.transform.localEulerAngles = new Vector3(15f, 0f, 0f);
29.             }
30.         }
31.  
32.         public override void OnStopClient()
33.         {
34.             if (isLocalPlayer && mainCam != null)
35.             {
36.                 mainCam.transform.SetParent(null);
37.                 SceneManager.MoveGameObjectToScene(mainCam.gameObject, SceneManager.GetActiveScene());
38.                 mainCam.orthographic = true;
39.                 mainCam.transform.localPosition = new Vector3(0f, 70f, 0f);
40.                 mainCam.transform.localEulerAngles = new Vector3(90f, 0f, 0f);
41.             }
42.         }
43.     }
44. }
45.  

 

Even easier -> Have the camera in the player prefab, and enable it with

onstartlocalplayer

.

Code (CSharp):

1. public GameObject cam;
2.  
3. public override void OnStartLocalPlayer(){
4.         cam.SetActive(true);
5.         Debug.Log("camera on");
6.     }

 

(Please forgive my poor English) Hello, I have encountered a scenario where I have to put a camera in the prefab: because I am making a vr game, I have to use the [CameraRig] prefab of SteamVR Plugin, which already has a camera in the prefab, and this camera is the screen displayed in the VR eye. What should I do in this situation?

 

xd its works, thx so much