Get a reference of a BehaviorTree created inside the Editor

Development Programming & Scripting C++
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1

Hi Guys,

I need to get the instance of a BehaviorTree created in the Editor (using Content Browser/Misscellaneous/BehaviorTree) in my AIController class.

I created the Behavior Tree inside the editor to see the Workflow and setup graphically but i like to get a instance of this behavior tree inside my AIController extended c++ class. To do a RunBehaviorTree with this reference. How i can do this, how i can get a reference of a BehaviorTree created inside the Editor ??

I know, i can do this in AIController blueprint connecting the Begin Play node to Run behavior Tree node and select the corresponding Asset, but i like to do this in Cpp. My problem is getting the BehaviorTree instance.

I trying using

static ConstructorHelpers::FObjectFinder BehaviorTreeBPClass(TEXT(“BehaviorTree’/Game/MyBehaviorTree.MyBehaviorTree’”));

inside AIController constructor but when i run this the editor show me this Message in the log tab.

Error /Game/MyBehaviorTree: Can’t find file for asset. /Script/BehaviorTreeEditor

Info Failed to load /Script/BehaviorTreeEditor.BehaviorTreeGraph Referenced by MyBehaviorTree Property /Script/AIModule.BehaviorTree:BTGraph

Info Failed to load /Script/BehaviorTreeEditor.BehaviorTreeGraph Referenced by MyBehaviorTree Property /Script/Engine.Blueprint:EditedDocumentInfo.EditedObject

The BehaviorTree for this test only have the Root node.

Thanks and sorry for my bad english

2

What UE4 version are you using? In general something like this should work:

static ConstructorHelpers::FObjectFinder<UBehaviorTree> BasicTree(TEXT("/Game/AI/BehaviorTrees/DefaultBT"));
BehaviorTree = BasicTree.Object;

Cheers,

–mieszko

3

The solution suggested by MieszkoZ works only inside a constructor, if you are outside a constructor you should use something like:

UClass* myAIController = StaticLoadClass(UObject::StaticClass(), NULL, TEXT("/Game/Characters/AI/Follower_AI_Controller.Follower_AI_Controller_C"), NULL, LOAD_None, NULL);

Please note there is no “Blueprint’” at the start and there is an additional “_C” at the end.