PlaySoundAtLocation plays sound after some delay

Development Programming & Scripting C++
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1

I’m developing the Pong game to learn Unreal Engine using C++.

I use this code in the class’ constructor to load the sound:

static ConstructorHelpers::FObjectFinder<USoundWave> HitSoundAsset(TEXT("/Game/Effects/pong-paddle.pong-paddle"));
	if (HitSoundAsset.Succeeded())
		HitSound = HitSoundAsset.Object;

And in OnHit event this code:

void APaddle::OnHit(UPrimitiveComponent* HitComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit)
{
	if ((OtherActor != nullptr) && (OtherActor != this) && (OtherComp != nullptr))
	{
		if (GEngine) GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, FString::Printf(TEXT("Paddle has been hit by: %s"), *OtherActor->GetName()));

		if (ABall* Ball = Cast<ABall>(OtherActor))
		{
			PlayHitSound();
		}
	}
}

And finally:

void APaddle::PlayHitSound()
{
	if (HitSound != nullptr)
	{
		UGameplayStatics::PlaySoundAtLocation(this, HitSound, GetActorLocation());
	}
}

But it sounds after the ball has bounced.

Is there any way to make it sounds immediately?

2

Is the sound file right? I mean, the sound starts at 0 and hasn’t any silent.

1 Like
3

Good question. The sound starts at 0 and it hasn’t any silent.

pong-paddle-wave

4

I have tried the same code in another game (developed using only C++, like this one) and the same thing happens. But here, I play the same sound more than once, and the second, third times play without any delay.

Do I need to preload (or anything similar) the sound before play it?

5

Yes, you need to either mark the cue’s wave files as preloaded, or preload the cue explicitly from code.

6

Thanks. And, how can I do that?

7

I’m not at the editor right now, so I can’t take a screen shot, but I seem to recall seeing a “preload” checkbox somewhere in the wave properties in the cue interface when I last looked at this.

And I looked in the docs, which SURELY would mention this, and … nothing? That’s pretty crazy!

I think the word to search for is “prime” perhaps?
[bPrimeOnLoad] USoundCue | Unreal Engine Documentation