UKismetMathLibrary::Set2D

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintCallable

Description

Sets the X and Y components of an existing FVector2D variable in place. The primary purpose is Blueprint, where struct variables cannot be set component-by-component without this helper.

Caveats & Gotchas

• This function mutates A via a ref parameter — it does not return a new vector. In C++ you can set components directly (A.X = ...; A.Y = ...;) which is clearer and avoids a function call overhead.
• UPARAM(ref) in Blueprint means A must be a variable (not a literal or inline value). Wiring a non-variable pin to the A input will cause a Blueprint compile error.

Signature

static UE_INL_API void Set2D(UPARAM(ref) FVector2D& A, double X, double Y);

Parameters

Name	Type	Description	Default
A	FVector2D&	The vector to modify in place.	—
X	double	New X component value.	—
Y	double	New Y component value.	—

Return Type

void

Example

Reset a velocity vector in Blueprint-exposed code C++

FVector2D Velocity(100.f, 50.f);
UKismetMathLibrary::Set2D(Velocity, 0.0, 0.0);
// Velocity is now (0, 0)

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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