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Birchnutdrakebrain

Based on game build 714014 | Last updated: 2026-02-27

Overview​

This component implements the behavior tree for the Birchnutdrake entity, an AI-controlled character in Don't Starve Together. It defines how the entity responds to threats (panic), navigates within a leashed range from its spawn point, pursues and attacks targets, and manages idle states. The component relies on common behavior utilities and integrates with the knownlocations component to track the entity's home position.

Dependencies & Tags​

  • Components used: knownlocations (used via inst.components.knownlocations for GetLocation and RememberLocation)
  • Tags: None identified

Properties​

No public properties are initialized in the constructor. All state is encapsulated within the class methods.

Main Functions​

BirchNutDrakeBrain:OnStart()​

  • Description: Initializes and assigns the entity's behavior tree. The behavior tree root is built using a priority sequence of behaviors: panic triggers (electric fence, general panic), leash logic, chase and attack, and a final fallback action to exit combat/idle.
  • Parameters: None
  • Returns: None

BirchNutDrakeBrain:OnInitializationComplete()​

  • Description: Records the entity's current position as the "spawnpoint" home location using the knownlocations component. This position is used later by the leashed behavior to determine how far the entity may wander.
  • Parameters: None
  • Returns: None

GetHomePos(inst)​

  • Description: Helper function used by the leashed behavior to retrieve the stored spawn point location. Used to compute distance for leash enforcement.
  • Parameters:
    • inst — The entity instance. Expected to have a knownlocations component.
  • Returns: Vector3 — The position stored under the key "spawnpoint".

Events & Listeners​

  • Listens to: None
  • Pushes:
    • "exit" — Fired in the fallback action node of the behavior tree (used to signal the entity should stop active behaviors and enter an idle state). Payload includes { force = true, idleanim = true }.

Notes​

  • Uses PriorityNode with timeout 0.25 for behavior evaluation.
  • The ChaseAndAttack behavior is configured with attack ranges 12 and 21.
  • The Leash behavior allows wandering up to 20 units from home before pulling the entity back within 5 units.