CODEWITHSUNDEEP
c++unreal-engine4
Mhh
Mhh

Reputation: 75

Unreal Engine 4: Super::Tick ( DeltaTime )

So I'm new to Unreal Engine 4 and thought the docs posted on their website would be a good place to start. However, I'm struggling with some things concerning the coding part (I have a pretty decent C++ knowledge). Here is the code extract I'm having some trouble with:

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

    FVector NewLocation = GetActorLocation();
    float DeltaHeight = (FMath::Sin(RunningTime + DeltaTime) - FMath::Sin(RunningTime));
    NewLocation.Z += DeltaHeight * 20.0f;       //Scale our height by a factor of 20
    RunningTime += DeltaTime;
    SetActorLocation(NewLocation);
}

I do not get how this works. I pretty much get the statements and all but I don't get how it works. So tick basically is a function called each tick (frame) and any other statements added are to edit the logic of the actor each frame. How does this work? Shouldn't the first statement "Super::Tick ( DeltaTime );" cause an endless recursion as there is no base (stopping) case? Any help would be appreciated. Thank you so much

Upvotes: 3

Views: 7662

Answers (1)

Stack Exchange Broke The Law
Stack Exchange Broke The Law

Reputation: 58929

There's no recursion here - it's calling Super::Tick, not itself.

Super is most likely a typedef of the base class, intended so that you can call its functions without having to remember its actual name in all situations.

So Super::Tick(DeltaTime); calls the Tick function in the base class (and passes it DeltaTime as an argument). This is useful if you override a function, but still want the "normal" stuff to happen as well as the stuff you wrote in your override.

Upvotes: 3

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