Unreal Engine Crash when stepping into Trigger Volume

[Luichy]

Unreal crashes when I step into the trigger volume to open the doors in this lecture.

I tested it and it only happens when the engine tries to run the code Play(); with sounds. So I guess it must be something with the audio engine.

This is the error that it gives when it crashes:

LoginId:9a81ca81844513ea857d1d9327e519fb

EpicAccountId:04bf92fa94fd44dcbe1fcdfa6e123ad6

Caught signal

UOpenDoor::TickComponent(float, ELevelTick, FActorComponentTickFunction*) Address = 0x183f1af74 [/Volumes/LG SSD 01/C++ Course/Building Escape/BuildingEscape/Source/BuildingEscape/OpenDoor.cpp, line 55] [in UE4Editor-BuildingEscape-5926.dylib]

FActorComponentTickFunction::ExecuteTick(float, ELevelTick, ENamedThreads::Type, TRefCountPtr const&) Address = 0x104bdc73c (filename not found) [in UE4Editor-Engine.dylib]

FTickFunctionTask::DoTask(ENamedThreads::Type, TRefCountPtr const&) Address = 0x105a2d820 (filename not found) [in UE4Editor-Engine.dylib]

TGraphTask::ExecuteTask(TArray<FBaseGraphTask*, FDefaultAllocator>&, ENamedThreads::Type) Address = 0x105a2d133 (filename not found) [in UE4Editor-Engine.dylib]

FNamedTaskThread::ProcessTasksNamedThread(int, bool) Address = 0x101a6ef7c (filename not found) [in UE4Editor-Core.dylib]

FNamedTaskThread::ProcessTasksUntilIdle(int) Address = 0x101a6e1a4 (filename not found) [in UE4Editor-Core.dylib]

FTickTaskSequencer::ReleaseTickGroup(ETickingGroup, bool) Address = 0x105a26cfa (filename not found) [in UE4Editor-Engine.dylib]

FTickTaskManager::RunTickGroup(ETickingGroup, bool) Address = 0x105a20918 (filename not found) [in UE4Editor-Engine.dylib]

UWorld::Tick(ELevelTick, float) Address = 0x105100f2b (filename not found) [in UE4Editor-Engine.dylib]

UEditorEngine::Tick(float, bool) Address = 0x10a8a86e7 (filename not found) [in UE4Editor-UnrealEd.dylib]

UUnrealEdEngine::Tick(float, bool) Address = 0x10b29f298 (filename not found) [in UE4Editor-UnrealEd.dylib]

FEngineLoop::Tick() Address = 0x101971d54 (filename not found) [in UE4Editor]

GuardedMain(wchar_t const*) Address = 0x10197bb48 (filename not found) [in UE4Editor]

-[UE4AppDelegate runGameThread:] Address = 0x101985c8e (filename not found) [in UE4Editor]

-[FCocoaGameThread main] Address = 0x101be7801 (filename not found) [in UE4Editor-Core.dylib]

Unknown() Address = 0x7fff31927882 (filename not found) [in Foundation]

_pthread_start Address = 0x7fff693e8109 (filename not found) [in libsystem_pthread.dylib]

thread_start Address = 0x7fff693e3b8b (filename not found) [in libsystem_pthread.dylib]

Need some help here.

Hardware:

Model Name:	MacBook Pro
Model Identifier:	MacBookPro11,2
Processor Name:	Quad-Core Intel Core i7
Processor Speed:	2.2 GHz
Number of Processors:	1
Total Number of Cores:	4
L2 Cache (per Core):	256 KB
L3 Cache:	6 MB
Hyper-Threading Technology:	Enabled
Memory:	16 GB
Boot ROM Version:	159.0.0.0.0
SMC Version (system):	2.18f15
Serial Number (system):	C02P866FG3QC
Hardware UUID:	36D9A928-709C-54BC-A7AD-2E5591F7BD8F

System Software:

System Version:	macOS 10.15.4 (19E287)
Kernel Version:	Darwin 19.4.0
Boot Volume:	Macintosh HD
Boot Mode:	Normal
Computer Name:	Luichy’s MacBook Pro
User Name:	Luis Guzman (LGuzman)
Secure Virtual Memory:	Enabled
System Integrity Protection:	Enabled
Time since boot:	4:30

UPDATE 1:

I went and applied all Lecture Project Changes and now it doesn’t crash but not playing sound.

This is my .cpp code for audio triggering (I have all my includes):

1. void UOpenDoor::BeginPlay()

• void UOpenDoor::FindAudioComponent()

2. {
3. AudioComponent = GetOwner()->FindComponentByClass();

• if (!AudioComponent)

4. {
5. UE_LOG(LogTemp, Error, TEXT(“There is no audio component present on %s!”), *GetOwner()->GetName());
6. }
7. }

• void UOpenDoor::OpenDoor(float DeltaTime)

8. {
9. CloseDoorSound = false;
10. if (!AudioComponent) {return;}
11. if (!OpenDoorSound)
12. {
13. AudioComponent->Play();
14. OpenDoorSound = true;
15. }
16. }

• void UOpenDoor::CloseDoor(float DeltaTime)

17. {
18. OpenDoorSound = false;
19. if (!AudioComponent) {return;}
20. if (!CloseDoorSound)
21. {
22. AudioComponent->Play();
23. OpenDoorSound = true;
24. }
25. }

UPDATE 2:

Solved! Some lines of code were missing.

[Aryan_Kumar]

Can you please post your code?

[Luichy]

Sure! Here it is:

#include "OpenDoor.h"
#include "Components/AudioComponent.h"
#include "Components/PrimitiveComponent.h"
#include "Engine/World.h"
#include "GameFramework/PlayerController.h"
#include "GameFramework/Actor.h"

#define OUT

// Sets default values for this component's properties
UOpenDoor::UOpenDoor()
{
	// Set this component to be initialized when the game starts, and to be ticked every frame.  You can turn these features
	// off to improve performance if you don't need them.
	PrimaryComponentTick.bCanEverTick = true;

	// ...
}

// Called when the game starts
void UOpenDoor::BeginPlay()
{
	Super::BeginPlay();

	InitialYaw = GetOwner()->GetActorRotation().Yaw;
	CurrentYaw = InitialYaw;
	// OpenAngle = InitialYaw + OpenAngle;
	OpenAngle += InitialYaw;

	FindPressurePlate(); 
	FindAudioComponent();
	{
		UE_LOG(LogTemp, Error, TEXT("%s has the OpenDoor component on it, but no PressurePlate set!"), *GetOwner()->GetName());
	}
}

void UOpenDoor::FindAudioComponent()
{
	AudioComponent = GetOwner()->FindComponentByClass<UAudioComponent>();

	if (!AudioComponent)
	{
		UE_LOG(LogTemp, Error, TEXT("%s has the open door component on it, but no pressureplate set!"), *GetOwner()->GetName());	
		UE_LOG(LogTemp, Error, TEXT("%s Missing audio component!"), *GetOwner()->GetName());
	}
}

void UOpenDoor::FindPressurePlate()
{
	if(!PressurePlate)
		{
			UE_LOG(LogTemp, Error, TEXT("%s has the open door component on it, but no pressureplate set!"), *GetOwner()->GetName());	
		}
}

// Called every frame
void UOpenDoor::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	if (TotalMassOfActors() > MassToOpenDoors)
	{
		OpenDoor(DeltaTime);
		DoorLastOpened = GetWorld()->GetTimeSeconds();
	}
	else
	{
		if(GetWorld()->GetTimeSeconds() - DoorLastOpened > DoorCloseDelay)
		{
			CloseDoor(DeltaTime);
		}
	}
}

void UOpenDoor::OpenDoor(float DeltaTime)
{
	CurrentYaw = FMath::FInterpTo(CurrentYaw, OpenAngle, DeltaTime, DoorOpenSpeed);
	FRotator DoorRotation = GetOwner()->GetActorRotation();
	DoorRotation.Yaw = CurrentYaw;
	GetOwner()->SetActorRotation(DoorRotation);

	CloseDoorSound = false;
	if (!AudioComponent) {return;}
	if (!OpenDoorSound)
	{
		AudioComponent->Play();
		OpenDoorSound = true;
	}
}

void UOpenDoor::CloseDoor(float DeltaTime)
{
	CurrentYaw = FMath::FInterpConstantTo(CurrentYaw, InitialYaw, DeltaTime, DoorCloseSpeed);
	FRotator DoorRotation = GetOwner()->GetActorRotation();
	DoorRotation.Yaw = CurrentYaw;
	GetOwner()->SetActorRotation(DoorRotation);

	OpenDoorSound = false;
	if (!AudioComponent) {return;}
	if (!CloseDoorSound)
	{
		AudioComponent->Play();
		CloseDoorSound = true;
	}
}

float UOpenDoor::TotalMassOfActors() const
{
	float TotalMass = 0.f;

	// Find All Overlapping Actors.
	TArray<AActor*> OverlappingActors;
	if (!PressurePlate) {return TotalMass;}
	PressurePlate->GetOverlappingActors(OverlappingActors);
	
	// Add Up Their Masses.
	
	for(AActor* Actor : OverlappingActors)
	{
		TotalMass += Actor->FindComponentByClass<UPrimitiveComponent>()->GetMass();
	}
	return TotalMass;
}

[Aryan_Kumar]

In BeginPlay() you have the UE_LOG statement in braces. And in FindAudioComponent() you have the UE_LOG statement of “No PressurePlate Set.” Otherwise I find nothing wrong with your code.

@Luichy

Solved! Some lines of code were missing.

So I think that the problem has been resolved and the game is working as expected?

[Luichy]

Everything Ok.