UKismetMathLibrary::VInterpTo_Constant

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Moves a vector toward a target at a constant rate (world units per second) rather than using exponential decay. Clamps to the target once it would overshoot.

Caveats & Gotchas

• Unlike VInterpTo, this function moves at a fixed speed regardless of distance. A far-away target takes longer to reach, and a nearby target snaps as soon as the remaining distance is less than InterpSpeed * DeltaTime — useful when predictable timing matters more than organic feel.
• InterpSpeed is in units per second, not a unitless rate like VInterpTo. Setting it too low relative to expected distances will make the object feel stuck; setting it too high produces an immediate snap.

Signature

static UE_INL_API FVector VInterpTo_Constant(FVector Current, FVector Target, float DeltaTime, float InterpSpeed);

Parameters

Name	Type	Description	Default
Current	FVector	The current value.	—
Target	FVector	The target value.	—
DeltaTime	float	Time elapsed since the last call, in seconds.	—
InterpSpeed	float	World units per second to move toward Target.	—

Return Type

FVector

Example

Move UI element at a fixed speed C++

// Moves widget position 300 units/s toward the anchor
CurrentWidgetPos = UKismetMathLibrary::VInterpTo_Constant(
    CurrentWidgetPos, AnchorPos, DeltaTime, 300.f);
WidgetTransform.Translation = FVector2D(CurrentWidgetPos.X, CurrentWidgetPos.Y);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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