UBlueprintSpringMathLibrary::DampFloat

function Engine Blueprint Since 5.7

#include "Kismet/BlueprintSpringMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Smooths Value towards Target using exponential damping, returning the new smoothed value each call. Unlike the spring functions, this is stateless and pure — there is no velocity to track.

Caveats & Gotchas

• Marked UE_EXPERIMENTAL(5.7, "SpringMath is experimental") — behaviour and defaults may change in later engine versions.
• Being BlueprintPure and stateless, the caller must feed the previous frame's return value back in as Value on the next call to get continuous smoothing — this function does not persist any state internally.
• Exponential damping has no overshoot but also no springiness; if you need the value to overshoot and settle (bounce), use CriticalSpringDampFloat instead.

Signature

static float DampFloat(float Value, float Target, float DeltaTime, float SmoothingTime = 0.2f);

Parameters

Name	Type	Description	Default
Value	float	The value to be smoothed.	—
Target	float	The target to smooth towards.	—
DeltaTime	float	Time interval in seconds.	—
SmoothingTime	float	Timescale over which to smooth. Larger values give more smoothed behaviour; can be zero.	0.2f

Return Type

float

Example

Smooth a value frame-to-frame C++

float SmoothedValue = 0.f;

void AMyActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);
    SmoothedValue = UBlueprintSpringMathLibrary::DampFloat(SmoothedValue, TargetValue, DeltaTime, 0.2f);
}

Version History

Introduced in: 5.7

Version	Status	Notes
5.7	experimental	SpringMath is experimental.

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