Move it smoothly or how to use VInterpTo

Development Programming & Scripting C++
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1

Hi!

I’m developing a Tetris clone game with Unreal 5.3.2 and C++.

I use this code to move the block, making it fall:

void ATBlock::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	const FDateTime CurrentDateTime = FDateTime::Now();
	UE_LOG(LogTemp, Log, TEXT("TICK - %s"), *CurrentDateTime.ToString());

	FHitResult OutSweepHitResult;

	SetActorLocation(GetNewLocation(), true, &OutSweepHitResult);

	if (OutSweepHitResult.IsValidBlockingHit())
	{
		UE_LOG(LogTemp, Warning, TEXT("SWEEP Block HIT - %s"), *FDateTime::Now().ToString());
		SetActorTickEnabled(false);

		if (OnStop.ExecuteIfBound())
		{
			UE_LOG(LogTemp, Warning, TEXT("ExecuteIfBound - %s"), *FDateTime::Now().ToString());
		}
		else
		{
			UE_LOG(LogTemp, Warning, TEXT("NO ExecuteIfBound - %s"), *FDateTime::Now().ToString());
		}
	}
}

FVector ATBlock::GetNewLocation() const
{
	const FVector CurrentLocation = GetActorLocation();

	return FVector(CurrentLocation.X, CurrentLocation.Y, CurrentLocation.Z - SpaceToMove);
}

But I want to move the block smoothly.

I think I have to use VInterpTo inside the Tick event, but inside this event it’s where I move the block and I don’t know how to do it.

How can I do it?

Thanks!

2

You can use VInterpTo or VInterpConstantTo and control the speed with InterpSpeed

const float InterpSpeed = 5.f;
SetActorLocation(FMath::VInterpConstantTo(GetActorLocation(), GetNewLocation(), DeltaTime, InterpSpeed), true, &OutSweepHitResult);
1 Like
3

While debugging make the interp speed a property that can be edited inside unreal so you dont have to keep flickering back and forth the performance gained from making it a value in the code will be miniscule.

And make it a const in your header then you can perform logic on it down the track when you want to speed it up to make the game harder

4

Thanks, for your answer. But, if I use it, the block doesn’t move.

I have changed the line:

SetActorLocation(GetNewLocation(), true, &OutSweepHitResult);

With the line:

SetActorLocation(FMath::VInterpConstantTo(GetActorLocation(), GetNewLocation(), DeltaTime, 0.5f), true, &OutSweepHitResult);

And it doesn’t move.

I have also checked FMath::VInterpTo, and it moves, but slower than if I use SetActorLocation(GetNewLocation(), true, &OutSweepHitResult);.

Thanks.

5

If you use VInterpConstantTo set the interp speed to something higher like 200