UKismetMathLibrary::Quat_GetAxisY

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns the right direction (local Y axis) of the coordinate frame represented by this quaternion. Equivalent to rotating FVector::RightVector (0,1,0) by Q.

Caveats & Gotchas

• In UE's coordinate system Y points right. If you need to strafe a character, this gives the correct strafing direction without converting through FRotator.
• The result is only a unit vector if Q is normalized. Non-unit quaternions (e.g. from accumulated floating-point drift) will produce scaled axis vectors.

Signature

static UE_INL_API FVector Quat_GetAxisY(const FQuat& Q);

Parameters

Name	Type	Description	Default
Q	const FQuat&	The quaternion representing the orientation.	—

Return Type

FVector

Example

Apply lateral force relative to orientation C++

FQuat ActorQuat = GetActorQuat();
FVector Right = UKismetMathLibrary::Quat_GetAxisY(ActorQuat);
GetMovementComponent()->AddForce(Right * LateralForce);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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