Trouble Moving Cube with Physics Handle

[gutterbeats]

Hello,

I’m having trouble getting the cube to move when using the PhysicsHandle. The object has a PhysicsActor Collision Preset selected. The default pawn has both the Grabber and the Physics Handle components. Here is my code…

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

	FindPhysicsHandle();
	SetupInputComponent();
}

void UGrabber::FindPhysicsHandle()
{
	// Checking for Physics Handle Component
	PhysicsHandle = GetOwner()->FindComponentByClass<UPhysicsHandleComponent>();

	if (!PhysicsHandle)
	{
		UE_LOG(LogTemp, Error, TEXT("Physics Handle Component is required for use by the Grabber Component. Missing on: %s"), *GetOwner()->GetName());
	}
}

void UGrabber::SetupInputComponent()
{
	InputComponent = GetOwner()->FindComponentByClass<UInputComponent>();
	if (!InputComponent)
	{
		return;
	}
	
	InputComponent->BindAction("Grab", IE_Pressed, this, &UGrabber::Grab);
	InputComponent->BindAction("Grab", IE_Released, this, &UGrabber::Release);
}

void UGrabber::Grab()
{
	FHitResult Hit;
	if (!GetFirstPhysicsBodyInReach(OUT Hit)) return;

	PhysicsHandle->GrabComponentAtLocation(Hit.GetComponent(), NAME_None, Hit.Location);
}

void UGrabber::Release()
{
	PhysicsHandle->ReleaseComponent();
}


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

	if (!PhysicsHandle->GrabbedComponent) return;
	
	// Get players viewpoint
	FVector PlayerLocation;
	FRotator PlayerRotator;
    	
	GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(OUT PlayerLocation, OUT PlayerRotator);
    
	// Ray-cast out to a certain distance (Reach)
	const FVector LineTraceEnd = PlayerLocation + PlayerRotator.Vector() * Reach;
    
	PhysicsHandle->SetTargetLocation(LineTraceEnd);
}

bool UGrabber::GetFirstPhysicsBodyInReach(FHitResult& HitResult) const
{
	// Get players viewpoint
	FVector PlayerLocation;
	FRotator PlayerRotator;
	
	GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(OUT PlayerLocation, OUT PlayerRotator);

	// Ray-cast out to a certain distance (Reach)
	const FVector LineTraceEnd = PlayerLocation + PlayerRotator.Vector() * Reach;
	const FCollisionQueryParams TraceParams(FName(TEXT("")), false, GetOwner());
	
	return GetWorld()->LineTraceSingleByObjectType(OUT HitResult, PlayerLocation, LineTraceEnd, FCollisionObjectQueryParams(ECollisionChannel::ECC_PhysicsBody), TraceParams);
}

Let me know if there is any more information that you need.

Thank you!

P.S. I’m using UE 4.26.2 on Windows 10.

[DanM]

How far is your Reach? Are you sure you’re not just too far away?

[gutterbeats]

The Grabber Reach is set to 100.0. I’ve set it to 300.0 and it still doesn’t do anything. I had logging set up in the code and I could see that the cube was being grabbed, but it wouldn’t actually move. I can put the logging back in and update the code snippet if you’d like. I’ll also include the output of the logs.

[gutterbeats]

I figured out what the issue was. It looks like I didn’t have the ‘Simulate Physics’ option enabled on the cube. Once I updated it, everything seems to be working now. Sorry about that, thanks for your help!