Curves, Create Custom Cubic Curves In Editor For Use In Code

Overview

Author: Rama

This wiki tutorial shows you how to get custom hand crafted curves into C++ !

This uses a combination of UE4 blueprints and UE4 c++ to enable you to create custom effects and physics movement curves in pure C++ with the ease of UE4's visual curve editor!

Below is a picture of the final result!

I draw this curve in the editor and and can now use it in C++ !

UE4 Curve Asset

UE4 Curve Editor

.h

UCLASS()
class AYourCharacter : public ACharacter
{
    GENERATED_UCLASS_BODY()

    /** Joy Curve */
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="JoyCurve")
    UCurveFloat* JoyCurve;    
    
    
    //Rama's Draw Point wrapper
    FORCEINLINE void DrawPoint 
    (
        const FVector& Loc,
        const float Size = 7,
        const FColor& Color = FColor::Red,
        const float Duration=-1.f
    ) const {
        DrawDebugPoint(
            GetWorld(), 
            Loc,  
            Size, //thickness
            Color, 
            false,
            Duration
        );
    } 

.cpp

//Tick
void AYourCharacter::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);
    //~~~~~~~~~~~~
    
    
    //~~~ Draw the Curve! ~~~

    if(JoyCurve)
    {
        for(float v = 0; v < 1; v+=0.01)
        {
            DrawPoint(GetActorLocation() + FVector(v * 128,0,128 * JoyCurve->GetFloatValue(v)) );
        }
    }
    else
    {
        //UE_LOG "Joy CURVE IS INVALID!!!!";
    }
}

Character BP

Compile the above addition to your Character class!

Now set the asset reference that you made in the code, in the editor in your character BP!

Conclusion

Enjoy!