UBTService_ReadAbilityState

Overview

UBTService_ReadAbilityState is a Behavior Tree service designed to read whether an ability instance is currently active and store this information in a specified blackboard key. It inherits from UBTService and overrides several lifecycle events to perform its primary function.

Properties

Type	Name	Access	Description
FBlackboardKeySelector	KeyToStoreValue	EditAnywhere	The blackboard key where the ability's active state will be stored.
FBlackboardKeySelector	AbilityInstanceKey	EditAnywhere	The blackboard key that contains the reference to the ability instance whose state is being checked.

Functions

Return Type	Signature	Description
void	InitializeFromAsset(UBehaviorTree& Asset)	Initializes the service with the behavior tree asset, resolving the selected keys for `AbilityInstanceKey` and `KeyToStoreValue`.
void	OnBecomeRelevant(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)	Called when the service becomes relevant. Currently empty but can be used to perform initialization tasks.
void	TickNode(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, float DeltaSeconds)	Ticks the node every frame. Reads the ability instance from the blackboard and updates the `KeyToStoreValue` with whether the ability is active or not.

Usage & Implementation Notes

Threading Constraints: This service should be used in a single-threaded context as it interacts with the Behavior Tree component.
Replication Requirements: Not applicable for this stateless utility.
Memory Lifetime Management: The service does not manage any dynamic memory and relies on the lifetime of the behavior tree and blackboard components.
Initialization Dependencies: Depends on AbilityInstanceKey being set in the blackboard to correctly read the ability instance.

22 May 2026