UKismetMathLibrary::Add_QuatQuat

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Adds two quaternions component-wise (A + B). The result is generally not a unit quaternion and has no direct geometric interpretation as a rotation.

Caveats & Gotchas

• Component-wise addition does not produce a valid rotation quaternion — the result must be normalized before it can be used as a rotation. This operation is mainly useful for quaternion blending (LERP numerator) rather than rotation composition.
• Do not confuse with Multiply_QuatQuat, which composes rotations. Add_QuatQuat is a linear algebra operation, not a rotation concatenation.

Signature

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

Parameters

Name	Type	Description	Default
A	const FQuat&	First quaternion operand.	—
B	const FQuat&	Second quaternion operand.	—

Return Type

FQuat

Example

Manual nlerp between two quaternions C++

// Simple normalized linear interpolation (nlerp) — cheaper than Slerp
float Alpha = 0.5f;
FQuat Blended = UKismetMathLibrary::Add_QuatQuat(
    A * (1.0f - Alpha),
    B * Alpha
);
Blended.Normalize();

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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