Behavior Tree

The minion’s loop runs on a Behavior Tree. The plugin ships BT_Extract_Resource (with blackboard BB_Extract_Resource), wired to call the Gatherer Component functions in the right order. You assign the tree per order in the Assignment Definitions data asset, so different orders can run different trees.

The gather loop

BT_Extract_Resource walks the minion through one full trip:

1. Set the home location so the minion knows where to haul resources back to.
2. Find the nearest matching resource within the search radius that the minion can navigate to.
3. Move to that resource.
4. Try to extract it, then wait for the timed harvest to finish.
5. Spawn the carried resource and attach it to the minion’s hand socket.
6. Move home.
7. Drop the carried resource so it settles on the pile.

Then the tree loops and the minion goes back for the next one.

The tasks

Each step maps to an included task and a Gatherer Component function:

Task	Calls	Purpose
BTT_Set_Home_Location	sets the home	Records where harvested resources are hauled.
BTT_Find_Resource_Location	Try Find Closest Resource Actor	Picks the nearest reachable matching resource.
BTT_Try_Extract	Try Begin Extracting Overlapping Actor	Starts the timed harvest and waits for it to complete.
BTT_Try_Spawn_Extracted_Resource	Try Spawn Extracted Resource And Attach To Character	Puts the carried resource in the minion’s hand.
BTT_Drop_Extracted_Resource	Detach Extracted Resource From Character	Drops the resource onto the home pile.

Customizing it

You have two ways to change behavior:

• Edit the tree. BT_Extract_Resource is an ordinary Behavior Tree; add decorators, services, or extra branches (idle animations, patrols, reactions) around the existing tasks.
• Swap the tree per order. Because each assignment names its own Assignment Behavior Tree, you can write a completely different tree for a given order and point that entry at it.

Either way, the Gatherer Component exposes every step as a callable function, so your custom tasks can reuse the same building blocks the included tree does.

Note

The minion needs an AI Controller for any of this to run; the tree is started on the controller. Set the character’s AI Controller Class as shown in Getting Started.