C++ constructor created collision boxes don't work

Development World Creation
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1

Hello, I’d love some input on this issue I’ve been dealing with for days now. I have found several questions referencing a similar problem, but based on the responses to those (link to one of the posts I viewed), everything should be working fine.

The problem: UBoxComponents added to my actor with CreateDefaultSubobject do not trigger overlap events. (in general, their collision settings - whatever they are - don’t seem to work

Example the works: Creating a BP from my C++ actor and adding a box component, copying the properties from the C+±created component, and binding an event in task graph to OnComponentBeginOverlap, works normally.

What I’m doing: I’m trying to add trigger volumes to a static interact-able actor in the level.

More context: I tried binding the OnComponentBeginOverlap of the C+±created box component in the BP task graph, but that also doesn’t work. Even calling GetOverlappingActors on the C+±created box in the actor tick function returns en empty set every time. As mentioned, the properties of both the C+±created box and the BP-created box are the same. This is the code I wrote to create the component in c++:

Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
SetRootComponent(Mesh);

Box = CreateDefaultSubobject<UBoxComponent>(TEXT("TriggerArea"));
Box->SetSimulatePhysics(false);
Box->InitBoxExtent(FVector(100, 100, 100));
Box->SetupAttachment(Mesh);
Box->SetCollisionProfileName(UCollisionProfile::Pawn_ProfileName);
Box->SetCollisionEnabled(ECollisionEnabled::QueryOnly);
Box->SetCollisionObjectType(ECC_WorldDynamic);
Box->SetGenerateOverlapEvents(true);

Is this a bug? Am I missing something obvious?

EDIT: I have tried to SetCollisionResponseToAllChannels(Overlap), and pretty much did exactly what this says.

Thanks for your time,
Dan

2

Are you triggering an overlap event in BP or in C++? Because if it’s in BP, then everything’s working fine (except for line 8), it triggers when a pawn enters the box.

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With what should this actor interact? A pawn, a linetrace, a projectile, …?

3

I am trying to catch the overlap both in BP and in C++ via On component overlap.AddDynamic(…)
None of those work.
The trigger box should interact with the player capsule, but I’ve also tried OverlapAllDynamic as the chosen collision profile.

4

Creating an actor with only what you showed, works fine to me. You must be doing something extra.

5

I tried creating a new actor, copying the code over, and now it works. No idea what this was, and I don’t even want to know. If anyone experiences similar black magic, I guess do what I did. :confused: