UKismetMathLibrary::DistanceSquared2D

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns the squared Euclidean distance between two 2D points without computing a square root. Prefer this over Distance2D whenever you only need to compare distances.

Caveats & Gotchas

• The returned value is distance squared — comparing it against a threshold requires squaring the threshold too (use ThresholdSq = Threshold * Threshold). A common bug is comparing DistanceSquared2D output directly against an unsquared radius.
• Not to be confused with Vector_Distance2DSquared, which operates on FVector (3D) inputs and ignores Z.

Signature

static UE_INL_API double DistanceSquared2D(FVector2D V1, FVector2D V2);

Parameters

Name	Type	Description	Default
V1	FVector2D	The first 2D point.	—
V2	FVector2D	The second 2D point.	—

Return Type

double

Example

Efficient proximity check without sqrt C++

FVector2D A(0.f, 0.f);
FVector2D B(30.f, 40.f);
float Radius = 50.f;
if (UKismetMathLibrary::DistanceSquared2D(A, B) < Radius * Radius)
{
    // Within range — no sqrt needed
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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