UKismetMathLibrary::LinearColorLerp

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Linearly interpolates between two linear colors channel-by-channel. Alpha=0 returns A, Alpha=1 returns B.

Caveats & Gotchas

• Alpha is not clamped — values outside [0,1] will extrapolate beyond A or B, potentially producing negative channel values or values above 1.
• Blending in linear RGB can produce a desaturated midpoint for complementary colors (e.g. red↔cyan passes through grey). Use LinearColorLerpUsingHSV to preserve saturation during large hue transitions.

Signature

static UE_INL_API FLinearColor LinearColorLerp(FLinearColor A, FLinearColor B, float Alpha);

Parameters

Name	Type	Description	Default
A	FLinearColor	Start color (returned when Alpha=0).	—
B	FLinearColor	End color (returned when Alpha=1).	—
Alpha	float	Blend factor in [0,1].	—

Return Type

FLinearColor

Example

Blend two colors by a gameplay variable C++

float HealthPercent = CurrentHealth / MaxHealth;
FLinearColor DisplayColor = UKismetMathLibrary::LinearColorLerp(
    FLinearColor::Red,
    FLinearColor::Green,
    HealthPercent
);
HealthBarMaterial->SetVectorParameterValue(TEXT("Color"), DisplayColor);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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