UKismetMathLibrary::VSize2D

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Returns the Euclidean length (magnitude) of a 2D vector. Equivalent to calling A.Length() on the FVector2D member directly.

Caveats & Gotchas

• Computing a vector length requires a square root. For distance comparisons, use VSize2DSquared and compare against the squared threshold to avoid the sqrt cost.
• Returns a double; assigning to a float variable may introduce precision loss on very large coordinate values.

Signature

static UE_INL_API double VSize2D(FVector2D A);

Parameters

Name	Type	Description	Default
A	FVector2D	The 2D vector whose length to compute.	—

Return Type

double

Example

Check if the player is within a 2D trigger radius C++

FVector2D Delta = FVector2D(PlayerPos) - FVector2D(TriggerPos);
double Dist = UKismetMathLibrary::VSize2D(Delta);
if (Dist < TriggerRadius)
    ActivateTrigger();

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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