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

Overview

Author: ( )

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!

( )