BrainComponent NULL

Development Programming & Scripting
1

What determines whether or not an AIController will have access to a valid UBrainComponent?

AAIController* AIController = Cast<AAIController>(TestPawn->Controller);

		if (AIController)
		{
			UBrainComponent* Brain = AIController->GetBrainComponent();

			if (!Brain)
			{
				UE_LOG(LogTemp, Warning, TEXT("No Brain: %s"), *TestPawn->GetName());
				return;
			}
		}

I’m finding that GetBrainComponent() returns NULL but I don’t know much about this component or why it would be NULL. What determines where it gets set and how is this component used in the big picture?

2

Your best bet is to go dig that yourself in the source code; it’s a great exercise and you will always find that you need to deal with similar problems in most C++ projects. We could go dig the source code for you, but you’re going to miss a lot of information and might not get the idea right.

3

Did you find the issue?
I’m experiencing a similar situation. I’ve just asked a similar question, referring to a possible cause for the BrainComponent null state. BrainComponent is not initialized if RunBehaviorTree is not called - AI - Unreal Engine Forums

4

According to the AIController’s source code, it only set BrainComponent when using a Behavior Tree via the RunBehaviorTree method. In that case, the BrainComponent will be an instance of UBehaviourTreeComponent.

5

hey please check my answer, just added it after looking the sources

6

You are just reporting what I’ve written in my answer. Anyway, I think we should wait for an official answer from someone at epic, in my opinion it sounds very strange that this component is initialized only via Blueprint.