UKismetMathLibrary::NotEqual_QuatQuat

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Returns true if two quaternions differ by more than the given per-component tolerance. Maps to the != operator in Blueprints.

Caveats & Gotchas

• Like EqualEqual_QuatQuat, this performs component-wise comparison — Q and -Q (same rotation, opposite sign) will return true (not equal) even though they represent identical rotations.
• The parameter is named ErrorTolerance here but Tolerance in EqualEqual_QuatQuat; both default to 1e-4f and behave identically.

Signature

static UE_INL_API bool NotEqual_QuatQuat(const FQuat& A, const FQuat& B, float ErrorTolerance = 1.e-4f)

Parameters

Name	Type	Description	Default
A	const FQuat&	First quaternion to compare.	—
B	const FQuat&	Second quaternion to compare.	—
ErrorTolerance	float	Maximum per-component absolute difference still considered equal.	1.e-4f

Return Type

bool

Example

Detect a rotation change before updating C++

if (UKismetMathLibrary::NotEqual_QuatQuat(NewRotation, LastRotation))
{
    SetActorRotation(NewRotation.Rotator());
    LastRotation = NewRotation;
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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