How do I create an UCurveFloat?

Development Programming & Scripting C++
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1

Hi
I have very simple question: how I can create UCurveFloat ? My question derives from setting up my own FVehicleEngineData and the last part I am missing is TorqueCurve. Thanks in advance for any clue.

2

This goes in a few steps, likely.

  1. Create data points:

    auto richCurve = new FRichCurve();  
auto key = richCurve->AddKey(0.f, 0.f);  
richCurve->AddKey(0.5f, 1.f);  
richCurve->AddKey(1.5f, 0.f);  
richCurve->SetKeyTime(key, 10.0f);  
richCurve->SetKeyInterpMode(key, RCIM_Linear);

  2. Create curve object itself

    auto curve = NewObject<UCurveFloat>();

  3. Add data to curve

    auto list= curve->GetCurves();  
list.Add(FRichCurveEditInfo(richCurve, FName{ TEXT("SomeCurveName") } ));

  4. Add to Timeline (assuming you have progressFunction initialized)

    timeline.AddInterpFloat(curve, progressFunction, FName{ TEXT("EFFECT_TIMED") });
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3

Hi,
Will these code create memory leak?

auto richCurve = new FRichCurve();

And never delete

4

Lifecycle management was not a part of this question, sorry. :slight_smile:

As FRichCurve is not handled by GC (not a part of UObjectBase etc) it has to be going through new/delete.
Actually, if you take a look into Engine Source Code you may find a lot of similar new-based allocations.
Like in CurveTable.cpp (Runtime/Engine/Private/) etc

So there are two ways - release it somewhere manually or have it added to a container that would manage lifecycle.

5

@robodrunk’s answer works, but instead of

auto list= curve->GetCurves();  
     list.Add(FRichCurveEditInfo(richCurve, FName{ TEXT("SomeCurveName") } ));

just:

curve->FloatCurve = *richCurve;
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