Referencing a Behavior Tree in C++

Development Programming & Scripting C++
1

I’m trying to set my behavior tree in my AI Controller using C++ with the following code:

ShooterController.h



UPROPERTY( )
class UBehaviorTree* BehaviorTree;

ShooterController.cpp



static ConstructorHelpers::FClassFinder< UBehaviorTree > ShooterBehaviorTreeReference(
	TEXT( "BehaviorTree'/Game/AI/ShooterBehaviorTree.ShooterBehaviorTree_C'" ) );

BehaviorTree = ShooterBehaviorTreeReference.Class.GetDefaultObject( );

The problem is that the Constructor Helper is failing to find the Behavior Tree Blueprint. I get the following error pop-up when I start the editor.



Default Property warnings and errors:
Error: CDO Constructor (VShooterController): Failed to find /Game/AI/ShooterBehaviorTree.ShooterBehaviorTree_C

Am I using the FClassFinder incorrectly?

2

OK, I got the error to stop appearing by switching the FClassFinder to a FObjectFinder.

I’m assuming you need to choose which one to use based on the base class of the thing you are trying to reference?

I also had to remove the ‘_C’ from the name of the resource, why do you use it for some but not others? It is only ‘classes’ and not ‘objects’?

3

Yep. You are looking for an instance of an object spawned in level, not a base class…