7. Testing Multiplayer Using the Sentry Device

Testing multiplayer game modes can be difficult due to the number of players involved, and you might not always have other people to play with. For this game mode, you can test eliminations in a single-player environment by using sentry devices. Because sentries have an EliminatedEvent you can subscribe to, they can act as enemy players for the purposes of testing your elimination code.

Follow these steps to grant weapons to players when they score an elimination on a sentry.

1. Add a new method TestPlayerEliminated to the team_elimination_game class. This is called whenever a sentry is eliminated.

    TestPlayerEliminated(Agent : ?agent) : void =
            Print("Sentry Down!")
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   TestPlayerEliminated(Agent : ?agent) : void = Print("Sentry Down!")

2. In TestPlayerEliminated, check if the Sentry was eliminated by a player, and if it was, pass the eliminating player to GiveNextWeapon. Because TestPlayerEliminated already accepts an agent option as an argument, you know implicitly which player scored this elimination.

    TestPlayerEliminated(Agent: ?agent) : void =
        Print("Sentry Down!")
        if(TeamPlayer := Agent?):
            GiveNextWeapon(TeamPlayer)
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   TestPlayerEliminated(Agent: ?agent) : void = Print("Sentry Down!") if(TeamPlayer := Agent?): GiveNextWeapon(TeamPlayer)

3. In OnBegin, add a new for loop to subscribe to each sentry's EliminatedEvent using TestPlayerEliminated. Your OnBegin code should look like the code below.

    OnBegin<override>()<suspends> : void =
        set Teams = GetPlayspace().GetTeamCollection().GetTeams()
        set EliminationsToEndGame = WeaponGranters.Length
        Logger.Print("Number of eliminations to end game is {EliminationsToEndGame}")
        Logger.Print("Beginning to assign players")
        PopulateTeamsAndPlayers()    
        for (Spawner : PlayerSpawners):
            Spawner.SpawnedEvent.Subscribe(OnPlayerSpawn) # Subscribe to each player spawn pad
        for (Sentry : Sentries):
            Sentry.EliminatedEvent.Subscribe(TestPlayerEliminated) # Subscribe to each Sentry
        # Subscribe to new players joining the game
        GetPlayspace().PlayerAddedEvent().Subscribe(OnPlayerAdded)
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   OnBegin<override>()<suspends> : void = set Teams = GetPlayspace().GetTeamCollection().GetTeams() set EliminationsToEndGame = WeaponGranters.Length Logger.Print("Number of eliminations to end game is {EliminationsToEndGame}") Logger.Print("Beginning to assign players") PopulateTeamsAndPlayers() for (Spawner : PlayerSpawners): Spawner.SpawnedEvent.Subscribe(OnPlayerSpawn) # Subscribe to each player spawn pad for (Sentry : Sentries): Sentry.EliminatedEvent.Subscribe(TestPlayerEliminated) # Subscribe to each Sentry # Subscribe to new players joining the game GetPlayspace().PlayerAddedEvent().Subscribe(OnPlayerAdded)

Save the script in Visual Studio Code, compile it, and click Launch Session in the UEFN toolbar to playtest the level. Scoring an elimination on either an enemy player or a sentry should promote you to the next weapon. If you're testing in a multiplayer setting, promotions should follow the two rules outlined in 5. Granting Weapons on Eliminations. Promoting past the final weapon in the sequence should end the game with the eliminating player as the winner.

Final Result

In the final step of this tutorial, you'll see the complete script for this tutorial.