OnComponentBeginOverlap works but not OnComponentEndOverlap

Development World Creation
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1

Aside from the code, here’s a list of things I’ve tried out that still don’t work:

  • Changing from AddUniqueDynamic to AddDynamic
  • Changing from OnComponentEndOverlap to OnActorEndOverlap
  • Changing both OnComponentBeginOverlap and OnComponentEndOverlap from protected to private

Below is my code. Any help is appreciated.

LevelStreamingTrigger.cpp:

ALevelStreamingTrigger::ALevelStreamingTrigger()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	OverlapVolume = CreateDefaultSubobject<UBoxComponent>(TEXT("OverlapVolume"));
	OverlapVolume->bGenerateOverlapEvents = true;
	RootComponent = OverlapVolume;

	OverlapVolume->OnComponentBeginOverlap.AddUniqueDynamic(this, &ALevelStreamingTrigger::OverlapBegins);
	OverlapVolume->OnComponentEndOverlap.AddUniqueDynamic(this, &ALevelStreamingTrigger::OverlapEnds);
}


void ALevelStreamingTrigger::OverlapBegins(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult)
{
	if (OtherActor->IsA(ACharacter::StaticClass()))
	{
		ACharacter* MyCharacter = UGameplayStatics::GetPlayerCharacter(this, 0);
		if (OtherActor == MyCharacter && LevelToLoad != "")
		{
			FLatentActionInfo LatentInfo;
			UGameplayStatics::LoadStreamLevel(this, LevelToLoad, true, true, LatentInfo);
		}
	}
	
}

void ALevelStreamingTrigger::OverlapEnds(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex)
{
	if (OtherActor->IsA(ACharacter::StaticClass()))
	{
		ACharacter* MyCharacter = UGameplayStatics::GetPlayerCharacter(this, 0);
		if (OtherActor == MyCharacter && LevelToLoad != "")
		{
			FLatentActionInfo LatentInfo;
			UGameplayStatics::UnloadStreamLevel(this, LevelToLoad, LatentInfo);
		}
	}
}

LevelStreamingTrigger.h:

UCLASS()
class PROCEDURALGENERATOR_API ALevelStreamingTrigger : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	ALevelStreamingTrigger();

protected:
	UPROPERTY(EditAnywhere)
		FName LevelToLoad;

private:
	// Overlap volume to trigger level streaming
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, meta = (AllowPrivateAccess = "true"))
		UBoxComponent* OverlapVolume;

	UFUNCTION()
		void OverlapBegins(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult);

	UFUNCTION()
		void OverlapEnds(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);
};
1 Like
2

Are you using a blueprint that inherits from ALevelStreamingTrigger? If so, did you create these event handlers before or after creating the blueprint? Does your OverlapVolume have a collision profile that supports overlapping? Are you using hot reload?

On a side note, please bump your own threads instead of bumping a thread that is almost nine months old.

3

Fixed it! For some reason, the LevelStreamingTrigger instance doesn’t update accordingly to the code. Therefore, I put the AddDynamic from the constructor to BeginPlay. For anyone of you who’s stuck with this problem, you may also follow this guide right here:

1 Like
4

Yes to all the questions you’ve asked. Thanks for contributing to help!

5

This is because you added the listeners after creating the blueprint of the type and are using hot reload. A practice I’ve come to use is to always close the editor whenever I’m going to make a change to code, make the change, then relaunch the editor from Visual Studio (Debug → Start without debugging). It’s annoying at first, but I’ve never run into this kind of problem since.