Add component to actor in C++ (the final word!)

[Yabab]

Using 5.3.2, trying to add components in the editor, not at runtime. Ended up going with this:

Actor->Modify();

UFoliageInstancedStaticMeshComponent* NewFoliageComponent = NewObject<UFoliageInstancedStaticMeshComponent>(Actor, UFoliageInstancedStaticMeshComponent::StaticClass());

NewFoliageComponent->OnComponentCreated();

NewFoliageComponent->AttachToComponent(Actor->GetRootComponent(), FAttachmentTransformRules::KeepRelativeTransform);

NewFoliageComponent->RegisterComponent();

Actor->AddInstanceComponent(NewFoliageComponent);

Using AddComponentByClass was working, and didn’t require the manual definition of the RootComponent, but made my engine crash when I left the level without saving the assets I inserted the components in. Sure, it’s an edge case, but still… This method doesn’t crash my engine when I wanna undo stuff without having to save and then revert.

I reckon only thing you might need to adapt for runtime use is the removal of Modify. Maybe not even that…

[STRiFE.x (STRiFE)]

@Yabab Actor-Modify() should be called before modifying the actor. You should also call NewComponent->OnComponentCreated();.

[Yabab]

Thanks, @STRiFE.x. Gave it a shot and it worked, so keeping it. I’ll update my previous post.