If you are ever building a multiplayer first-person shooter in Unity using the Photon plugin you might run into this problem. The problem we discuss is when you have more than one camera in your scene because there is a camera attached to each player object. This will cause the cameras to stack up on top of each other and the top or primary camera might not be your first-person camera which means while you are controlling your local player object you might not be viewing your player through their camera.
To fix this problem you need to disable the camera of each player object that is not your local player object. You will need to use the photon view component to check to see if the is mine variable is false. If it is then you will need to use a camera variable and set the enable variable to false. This will make it so you will only have one camera active in your multiplayer scene and that will be your local first-person camera.
This is a Debugging video for how to fix an Unassigned Reference Exception error when using an Observed Component in Unity with Photon. This is a very easy error to fix as It only takes switching one variable in the inspector. If you are receiving this error it is probably because you accidentally made one little mistake without realizing it.
To fix this error all you must do is look at all you Photon Prefabs and make sure that the Observe Option of the Photon View component is set to off or you have at least on observed component set. If the Observe option is turned on and you don’t have a component being observed then you will be receiving this error.
Learn to make a Custom Matchmaking system using the Photon Plugin
For this tutorial on how to use the Photon 2 plugin in Unity, I will be teaching you how to make a custom matchmaking system. This will allow you to connect to lobbies, create rooms, search rooms, and join rooms. This type of matchmaking system can be found in popular games such and Battlefield, PUBG, and Insurgency.
For this lesson, we will begin by showing you how to set up your UI system for your main menu scene. You will have the main menu panel which will have one button for connecting to the Photon lobby. We will then need a Lobby panel which will have two input fields for creating new rooms. We will then need two buttons, one for creating a room and one for returning to the main menu panel. This panel will also need a container to hold all the room listing objects. The last panel we will need for this scene is the room panel. This panel will need two, once for starting the game and loading the multiplayer scene and one for leaving the currently connected room. This panel will also need another container for holding all the player listing objects.
Scripting the Lobby Controller
Next up we will open our scripts need for this custom matchmaking system. For the lobby controller script, we need to enable the lobby connect button once we have connected to the master photon servers. We then need to make a public function for this lobby connect button. in this function, we will connect the player to a photon lobby using PhotonNetwork.JoinLobby(); Once our player has connected to a photon lobby the OnRoomListUpdate callback function will begin sending updates for what rooms are in the lobby. We will use this callback function to instantiate room listing object into our container object. Next, we will create public functions to pair to the different UI object we have for creating new rooms.
Scripting the Room Controller
Next, we will switch over to the room controller script. In this script, we will first use the OnJoinedRoom callback function for updating all the player listings in the container of our room panel. We will also do the same for when other players join and leave the current room. To do this we will use the OnPlayerEnteredRoom and OnPlayerLeftRoom callback functions. The last thing we need to do for this script is creating public functions, one for the start game but and the second for the leave room button. The start game function should load all the players into the multiplayer scene using PhotonNetwork.LoadLevel(); via the master client.
Scripting the Room Button
The last script that we need for this tutorial is the script attached to the room listing prefab. This room button script needs to have a public function for updating the room name and room size. This function is called in the lobby controller when the room listing is instantiated on the room container object. This script also needs to have a public function for the on click on this button object. This function should have the players then join the room of this room listing object via the room name. This is done by using PhotonNetwork.JoinRoom( roomName );
Applying Code to Unity Scene
Back in Unity, we need to attach these script to their respective objects and then initialize all the need variables in the inspector. We will then need to set the OnClick and OnValueChanged functions for any necessary UI objects. This will require you to create the room listing prefab and player listing prefab objects. Once you have done all this you should then have a working custom matchmaking system for your next multiplayer game.
