UKismetMathLibrary::Sin

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns the sine of angle A in radians. Result is always in the range [-1, 1].

Caveats & Gotchas

• Input must be in radians, not degrees — passing a degree value (e.g., 90) will return sin(90 rad) ≈ 0.894, not 1.0. Use DegSin if your angles are in degrees.
• For game-logic wave effects that run every tick, consider precomputing with a lookup table or using FMath::Sin directly to avoid Blueprint overhead if called thousands of times per frame.

Signature

static UE_INL_API double Sin(double A);

Parameters

Name	Type	Description	Default
A	double	The angle in radians.	—

Return Type

double

Example

Drive a floating bobbing effect C++

void AFloatingActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);
    double Time = GetWorld()->GetTimeSeconds();
    double BobOffset = UKismetMathLibrary::Sin(Time * BobFrequency) * BobAmplitude;
    SetActorLocation(BaseLocation + FVector(0, 0, BobOffset));
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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