UBTService_Timer

Overview

UBTService_Timer is a Behavior Tree service used to manage a countdown timer. It inherits from UBTService and provides functionality to initialize, tick, and handle the lifecycle of the timer. The timer can be set to loop or not, and it updates a blackboard key when the timer expires.

Properties

Type	Name	Access	Description
`FValueOrBBKey_Float`	Duration	EditAnywhere	The duration of the timer.
`bool`	bLoop	EditAnywhere	Whether the timer should loop after expiration.
`FBlackboardKeySelector`	DoneKey	EditAnywhere	The blackboard key to update when the timer expires.

Functions

Return Type	Signature	Description
`uint16`	GetInstanceMemorySize() const	Returns the size of the instance memory required for this service.
`void`	InitializeFromAsset(UBehaviorTree& Asset)	Initializes the service from a behavior tree asset.
`void`	OnBecomeRelevant(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)	Called when the service becomes relevant. Sets up the timer and clears the blackboard key.
`void`	TickNode(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, float DeltaSeconds)	Ticks the node, updating the timer and blackboard key as necessary.
`void`	OnCeaseRelevant(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)	Called when the service ceases to be relevant. Resets the timer and clears the blackboard key.

Usage & Implementation Notes

Threading Constraints: This service is designed to run on the game thread.
Replication Requirements: None.
Memory Lifetime Management: The memory for FTimerMem is managed by the Behavior Tree system.
Initialization Dependencies: Depends on a valid blackboard asset.

22 May 2026