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Glommerbrain

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

Overview​

The glommerbrain component implements the decision-making logic for the Glommer entity in Don't Starve Together. It defines a behavior tree (BT) that orchestrates core movement and reaction behaviors: following its leader, wandering when no leader is present or conditions permit, facing its leader, and responding to panic-inducing stimuli such as proximity to electric fences or other threats. The brain inherits from Brain and uses shared utilities (BrainCommon) and custom helper functions to determine targets and positions.

This component interacts directly with the follower component to resolve the current leader and relies on behavior classes (Follow, Wander, FaceEntity) to execute specific movement patterns.

Dependencies & Tags​

  • Components used:
    • follower (used via inst.components.follower:GetLeader())
  • Tags: None identified.

Properties​

No explicit public properties are defined in the constructor. The component stores its behavior tree in self.bt during initialization but does not declare additional state beyond inherited Brain fields.

Main Functions​

GlommerBrain:OnStart()​

  • Description: Initializes the behavior tree root node. This method is called automatically when the brain component starts and sets up a priority-based behavior tree (PriorityNode) with six decision branches evaluated in order. Execution falls through from high-priority behaviors (e.g., panic) to lower-priority ones (e.g., wandering) based on triggering conditions.
  • Parameters: None.
  • Returns: None.

Behavior Tree Structure (Internal)​

The root node is constructed as a PriorityNode with the following ordered sub-nodes:

  1. BrainCommon.PanicTrigger(self.inst)
    Triggers panic behavior (e.g., fleeing) under threat conditions.

  2. BrainCommon.ElectricFencePanicTrigger(self.inst)
    Triggers panic specifically when Glommer approaches an active electric fence.

  3. DoAction(self.inst, WanderOff)
    Executes the WanderOff action, which issues a GOHOME action if inst.ShouldLeaveWorld is true.

  4. Follow(...)
    Activates follow behavior: moves Glommer toward its leader, maintaining a target distance of 4 units, with minimum and maximum follow distances of 0 and 6 respectively.

  5. FaceEntity(...)
    Ensures Glommer always faces its leader. Uses GetFaceTargetFn to resolve the target and KeepFaceTargetFn to verify the target hasn't changed.

  6. Wander(...)
    If no higher-priority behavior executes, initiates wandering within a radius of 10 units around the leader’s position.

All behaviors are evaluated every tick, with the highest-priority enabled branch taking precedence.

Events & Listeners​

None identified. The brain does not register any event listeners or push custom events directly. Its logic is driven entirely by behavior tree evaluation and component interaction (follower component state changes implicitly affect behavior via helper functions).