One thing that I wish the section dug into was event driven door opening and closing. I really wanted to get the code executed every tick down as much as possible, and having one of the blueprint events broadcasted constantly seemed like a red flag. This was a little more confusing to get going than I would of hoped, but I’m happy with the result.
The first thing I needed to do was add some methods to handle an overlap begin and end event in my OpenDoor.h file:
UFUNCTION() void PressurePlateOverlapBegan(AActor* OverlappedActor, AActor* OtherActor); UFUNCTION() void PressurePlateOverlapEnded(AActor* OverlappedActor, AActor* OtherActor);
Some interesting bits on this. I needed to add UFUNCTION() for the multi-cast delegates to work. On initially running this code I got a complaint about argument names. I thought it meant something with UFUNCTION(), but it actually needed the argument names (OverlappedActor and OtherActor); I originally had those omitted.
The implementation for these two methods was quite simple:
void UOpenDoor::PressurePlateOverlapBegan(AActor* OverlappedActor, AActor* OtherActor) { if (GetTotalMassOfActorsOnPlate() >= TriggerMass) { OnOpen.Broadcast(); } } void UOpenDoor::PressurePlateOverlapEnded(AActor* OverlappedActor, AActor* OtherActor) { if (GetTotalMassOfActorsOnPlate() < TriggerMass) { OnClose.Broadcast(); } }
To wire these up, In BeginPlay after checking that PressurePlate existed, I did this:
PressurePlate->OnActorBeginOverlap.AddDynamic(this, &UOpenDoor::PressurePlateOverlapBegan); PressurePlate->OnActorEndOverlap.AddDynamic(this, &UOpenDoor::PressurePlateOverlapEnded);
That code felt a little odd. OnActorBeginOverlap seemed like a single method signature in C++, but that interesting macro I found from googling (AddDynamic) somehow knew what to do with it.
Lastly, I removed all the code from the TickComponent method except the Super call. It was all handled via events now.
Did anyone else give this a shot? Is this the best way to do it?
Thanks 