UKismetMathLibrary::Quat_Inversed

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns the inverse (conjugate for unit quaternions) of the given quaternion. Multiplying a quaternion by its inverse yields the identity rotation.

Caveats & Gotchas

• For unit quaternions the inverse equals the conjugate (-X, -Y, -Z, W). If Q is not normalized, the result is the true mathematical inverse (conjugate / squared magnitude), which may not represent a pure rotation.
• A common use is computing the delta rotation between two orientations: DeltaQ = TargetQ * InverseQ. The multiplication order matters — quaternion multiplication is not commutative.

Signature

static UE_INL_API FQuat Quat_Inversed(const FQuat& Q);

Parameters

Name	Type	Description	Default
Q	const FQuat&	The quaternion to invert.	—

Return Type

FQuat

Example

Compute delta rotation between two actors C++

FQuat ActorA = GetActorQuat();
FQuat ActorB = OtherActor->GetActorQuat();

// DeltaQ rotates from ActorA's frame to ActorB's frame
FQuat InvA  = UKismetMathLibrary::Quat_Inversed(ActorA);
FQuat DeltaQ = ActorB * InvA;

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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