UKismetMathLibrary::MakeRotFromXY

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Builds a rotator from two axes: X is treated as the primary (fixed) forward axis, and Y is adjusted to be orthogonal to X. Z is computed as the cross product. Inputs need not be normalized.

Caveats & Gotchas

• X is guaranteed to be preserved exactly (after normalization); Y may be rotated in the XY plane to enforce orthogonality, so the returned rotator's Y axis may not match the input Y axis exactly.
• If X and Y are parallel or anti-parallel the result is degenerate — the engine does not assert, so the output will be numerically unstable.

Signature

static UE_INL_API FRotator MakeRotFromXY(const FVector& X, const FVector& Y);

Parameters

Name	Type	Description	Default
X	const FVector&	Primary (fixed) forward axis. Will not be modified.	—
Y	const FVector&	Secondary right axis, adjusted minimally to enforce orthogonality.	—

Return Type

FRotator

Example

Orient a weapon to face forward with a known up hint C++

FVector Forward = (Target - Source).GetSafeNormal();
FVector Right = FVector::CrossProduct(FVector::UpVector, Forward).GetSafeNormal();
FRotator WeaponRot = UKismetMathLibrary::MakeRotFromXY(Forward, Right);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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