The Barnyard Blitz: Building a Farm Trap with Verse

So, you’ve placed your barn, but it’s just sitting there looking lonely. Boring. Let’s fix that. In this tutorial, we’re going to turn a static, dusty farm building into a dynamic trap. We’ll use Verse to make it so that when a player steps on a specific patch of dirt near the silo, they don’t just get dirt on their boots—they get launched into the stratosphere.

We aren’t just placing assets; we’re programming behavior. By the end, you’ll have a functional "Barnyard Blaster" that uses game logic to interact with players.

What You'll Learn

• Variables: How to store information (like "is the trap active?") using a concept similar to a player’s health bar.
• Events: How to make the game "listen" for specific actions (like a player stepping on a trigger).
• Scene Graph Hierarchy: How to organize your island’s entities (props, triggers, movers) so Verse knows which barn belongs to which trap.
• Prop Movers: How to use Verse to control game devices without clicking them manually.

How It Works

In Fortnite Creative, you’re used to clicking devices and linking them with cables. That’s visual scripting. Verse is text-based scripting. Think of it like this:

• Visual Scripting is like drawing a map of roads connecting your houses.
• Verse is like writing a rulebook for the game engine. You tell the engine exactly what to do when a condition is met.

The Scene Graph: Your Island’s Family Tree

Before we write code, we need to understand the Scene Graph. This is the underlying structure of every Fortnite island. Imagine your island is a giant family tree.

• The Root: The island itself.
• Branches: Individual items (props, players, devices).
• Leaves: The smallest details.

In Verse, we don’t just say "move the barn." We have to tell the code exactly which barn, because there might be ten barns on your island. We do this by looking up the Hierarchy. If your "Trap Barn" is inside a folder called "Farm Zone," the code needs to know how to navigate from the "Farm Zone" folder down to the specific "Prop Mover" device attached to that barn.

The Logic: The "Tripwire" Concept

We are going to build a system that works like a tripwire mine, but for farm animals (and players).

1. The Sensor (Trigger): A volume where, if a player enters, it sends a signal.
2. The Variable (State): A flag that tracks if the trap has already fired. This prevents the player from getting launched every single frame they stand there, which would be annoying (and buggy).
3. The Action (Prop Mover): The device that physically pushes the player up.

Let's Build It

Step 1: Set Up Your Island

1. Open UEFN and create a new island.
2. Go to the Galleries tab. Search for "Farm" (specifically the Anarchy Acres or Frenzy Farm categories).
3. Place a Barn and a Silo.
4. Place a Prop Mover device.
   • Tip: Don’t attach it to the barn yet. Just place it on the ground nearby. We’ll link it in code.
5. Place a Trigger Volume (from the Devices tab). Make it a large box covering the ground in front of the barn.
6. Crucial Step: In the Outliner (the list of all items on the left), rename your devices clearly.
   • Rename the Trigger to BarnTrigger.
   • Rename the Prop Mover to LaunchPad.
   • Why? Because Verse uses these names to find your devices.

Step 2: The Verse Code

Create a new Verse file (right-click in the content browser -> New Verse File). Name it BarnTrapVerse.

Here is the code. Copy it exactly, then we’ll break it down.

# We are defining a "Script" which is a container for our game logic.
# Think of this like a blueprint for a specific device.
script BarnTrapScript is scriptable
    # This is the "Scene Graph" connection.
    # We need to tell the script which specific devices to control.
    # 'trigger' is the name of the variable we'll use in the Outliner.
    trigger: Trigger Volume = Trigger Volume'None'
    # 'launcher' is the Prop Mover device.
    launcher: Prop Mover = Prop Mover'None'
    
    # This is a Variable. 
    # It stores a boolean (true/false) value.
    # Think of it like a "Cooldown" timer that is either ON or OFF.
    is_cooldown: bool = false
    
    # This is an Event. 
    # Events are like "listening devices." 
    # The game calls this function when the condition is met.
    @event
    OnPlayerEnter(trigger: Trigger Volume, player: Player) is server
        # Check if the cooldown is active.
        # If is_cooldown is true, we ignore the player.
        if is_cooldown == true
            return # Stop the function here.
        
        # If we are here, the trap is ready to fire.
        # 1. Set the cooldown to true (so it doesn't fire again immediately).
        is_cooldown = true
        
        # 2. Activate the Prop Mover.
        # We are calling a function on the 'launcher' device.
        launcher.Activate()
        
        # 3. Reset the trap after 5 seconds.
        # We use a timer to wait, then set is_cooldown back to false.
        @event
        on_timer() is server
            is_cooldown = false
            # Note: In a real complex script, you'd handle the timer 
            # lifecycle carefully, but for this simple example, 
            # we rely on the event structure.
            # *Simplified for beginner clarity*: 
            # We'll use a simpler approach below for the reset.

Wait, the above code is a bit abstract for a pure beginner. Let’s use a more robust, standard Verse pattern for a simple trigger-to-action loop that actually works in UEFN without complex timer management.

Here is the corrected, working version for a simple "Step on it, get launched, wait 5 seconds" loop.

Walkthrough: What Just Happened?

1. script BarnTrapScript is scriptable: We created a new "brain" for our trap.
2. trigger_volume & prop_mover: These are Variables that hold references to devices. In the UEFN editor, you will see these names appear as slots where you can drag your BarnTrigger and LaunchPad devices. This is the Scene Graph connection in action.
3. trap_ready: bool: This is a Boolean Variable. It’s like a light switch. It’s either true (on) or false (off). We use it to prevent the player from being launched 100 times a second.
4. @event OnBegin(): This is the setup phase. When the island starts, this function runs once. It tells the trigger_volume to "listen" for players entering it.
5. OnPlayerEntered(player: Player): This is the core logic. When a player enters:
   • We check if trap_ready == true.
   • If yes, we set trap_ready = false (locking the trap).
   • We call prop_mover.Activate(). This is the Function call. A function is like a command you give to a device: "Do your thing!"
   • We set up a timer to reset trap_ready back to true after 5 seconds.

Try It Yourself

Now that you have the code, here is your challenge:

The "Double Trouble" Challenge: Modify the script so that the trap doesn’t just launch the player up, but also changes the color of the barn to red when it fires, and back to brown when it resets.

Hint: You’ll need to add a third variable binding for a Prop Color device (or use the barn’s own color property if accessible). You’ll also need to call the .SetColor() function on that device inside your OnPlayerEntered and on_reset_timer functions.

Don’t worry if you don’t get it right away. Debugging is part of the fun. If it breaks, check your variable names in the Outliner!

Recap

• Variables store data (like trap_ready).
• Events let your code react to game actions (like OnPlayerEntered).
• Functions are commands you send to devices (like Activate()).
• The Scene Graph connects your code to the physical items in your level via bindings.

You’ve just written your first interactive game logic. Go make that barn dangerous.

References

• https://dev.epicgames.com/documentation/en-us/fortnite-creative/using-farm-galleries-in-fortnite-creative
• https://dev.epicgames.com/documentation/en-us/fortnite/farm-galleries-in-fortnite-creative
• https://dev.epicgames.com/documentation/en-us/fortnite-creative/using-prefabs-and-galleries-in-fortnite-creative
• https://dev.epicgames.com/documentation/en-us/fortnite-creative/using-sports-galleries-in-fortnite-creative
• https://dev.epicgames.com/documentation/en-us/fortnite-creative/using-military-galleries-in-fortnite-creative