Task nodes are like function blocks. Each Task node you construct will allow you to bundle up some Blueprint code for execution when certain conditions in your Behavior Tree are met.
Tasks have three distinct events: Receive Tick (with AI version), Receive Execute (AI), and Receive Abort (AI). You can respond to any of these three events in the Task's Blueprint. Usually, you should respond to the Receive Execute (AI version) of the Task.
To create a Task node, you should already have a Behavior Tree ready and attached to an appropriate AI Controller and Blueprinted Character (see previous recipe).
- To construct a Task node with an executable Blueprint code inside it, you must select New Task from the menu bar from our Behavior Tree Blueprint editor. From the drop-down menu that appears, select to base your New Task on
BTTask_BlueprintBase.
- Double-click and open the Behavior Tree task that you've just created to edit it. Override any of the available events (listed in the Functions subheading under the My Blueprint tab):
- Receive Tick AI: The AI version of the
Tickevent for the Behavior Tree Task. You should override this function when you need your task toTickwith the actor that contains it. Do not override this function if you only want your task to execute when it is called by the Behavior Tree (not when the game engine ticks). - Receive Execute AI: The main function that you want to override. Receive Execute AI allows you to run some Blueprint code whenever the Task node is invoked from the Behavior Tree diagram.
- Receive Abort AI: An abortion on a Behavior Tree task is called when the task is being aborted (by a
FinishAbort()node call from the Blueprints diagram).
- Receive Tick AI: The AI version of the
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