UsingPhysicsHandle.cpp

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

	// Get player view point this tick
    FVector PlayerViewPointLocation;
    FRotator PlayerViewPointRotation;
    GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(
        OUT PlayerViewPointLocation,
        OUT PlayerViewPointRotation
    );
    //UE_LOG(LogTemp, Warning, TEXT("Viewpoint location: %s, rotation: %s"), *PlayerViewPointLocation.ToString(), *PlayerViewPointRotation.ToString());
    
    const auto LineTraceStartVector = PlayerViewPointLocation;
    const auto LineTraceEndVector = LineTraceStartVector + Reach * PlayerViewPointRotation.Vector();
    
    DrawDebugLine(
                  GetWorld(),
                  LineTraceStartVector + 10 * FVector::UpVector,
                  LineTraceEndVector,
                  FColor(255, 0, 0),
                  false,
                  0.f,
                  0.f,
                  10.f
                  );
    
    // Ray-cast out to reach distance
    FHitResult HitResult;
    GetWorld()->LineTraceSingleByObjectType(HitResult, LineTraceStartVector, LineTraceEndVector, FCollisionObjectQueryParams(ECollisionChannel::ECC_PhysicsBody));
    
    // See what we hit
    AActor* ActorHit = HitResult.GetActor();
    auto* handle = (UPhysicsHandleComponent*)GetOwner()->GetComponentByClass(UPhysicsHandleComponent::StaticClass());
    if (ActorHit) {
        UE_LOG(LogTemp, Warning, TEXT("Hit something %s"), *ActorHit->GetName());
        if (!handle->GrabbedComponent) {
            handle->GrabComponent(HitResult.GetComponent(), NAME_None, LineTraceEndVector, true);
        }
    }
    
    handle->SetTargetLocation(LineTraceEndVector);
    UE_LOG(LogTemp, Warning, TEXT("Hit something %s"), *handle->GetClass()->GetName());

}