UKismetMathLibrary::Vector4_SizeSquared3

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Returns X*X + Y*Y + Z*Z for the vector, ignoring W. Prefer this over Vector4_Size3 whenever you are comparing lengths or checking thresholds, as it avoids a square root.

Caveats & Gotchas

• W is ignored — a W value of 0 or 1 has no effect on the result.
• The return type is double; comparing against a float threshold requires care to avoid implicit precision differences.

Signature

static UE_INL_API double Vector4_SizeSquared3(const FVector4& A);

Parameters

Name	Type	Description	Default
A	const FVector4&	The vector whose XYZ squared length is computed.	—

Return Type

double

Example

Distance threshold check without sqrt C++

FVector4 Vec(1.0, 2.0, 2.0, 0.0);
if (UKismetMathLibrary::Vector4_SizeSquared3(Vec) < 9.0)
{
    // XYZ length < 3
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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