UKismetMathLibrary::Vector4_IsZero

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns true only if all four components of A are exactly 0.0. No tolerance is applied.

Caveats & Gotchas

• Checks all four components including W. A direction vector that was constructed as (0, 0, 0, 0) will return true, but a point at the origin (0, 0, 0, 1) with W=1 will return false — which may be surprising if you are only checking spatial position.
• For practical zero-checks on computed vectors, prefer Vector4_IsNearlyZero3 with a tolerance. Exact zero almost never occurs after arithmetic due to floating-point rounding.

Signature

static UE_INL_API bool Vector4_IsZero(const FVector4& A)

Parameters

Name	Type	Description	Default
A	const FVector4&	The vector to test.	—

Return Type

bool

Example

Check whether a vector was left at its default zero state C++

FVector4 Dir; // default-initialized to (0,0,0,0)
if (UKismetMathLibrary::Vector4_IsZero(Dir))
{
    Dir = FVector4(0.0, 0.0, 1.0, 0.0); // set a default forward direction
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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