UKismetMathLibrary::Multiply_QuatQuat

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Multiplies two quaternions, composing their rotations. The result represents first applying B, then A.

Caveats & Gotchas

• Quaternion multiplication is not commutative — A * B ≠ B * A in general. The header comment explicitly states B is applied first, then A; reversing arguments produces a different rotation.
• Repeated multiplication without re-normalisation accumulates floating-point drift; call Normalize() periodically when chaining many rotations together.

Signature

static UE_INL_API FQuat Multiply_QuatQuat(const FQuat& A, const FQuat& B)

Parameters

Name	Type	Description	Default
A	const FQuat&	The left-hand quaternion (applied second in the composed rotation).	—
B	const FQuat&	The right-hand quaternion (applied first in the composed rotation).	—

Return Type

FQuat

Example

Compose a local rotation with a world rotation C++

FQuat WorldRot = GetActorQuat();
FQuat LocalSpin = FQuat(FVector::UpVector, FMath::DegreesToRadians(45.0f));
// Apply local spin first, then world rotation
FQuat Combined = UKismetMathLibrary::Multiply_QuatQuat(WorldRot, LocalSpin);
SetActorRotation(Combined.Rotator());

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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