UKismetMathLibrary::EqualEqual_Vector4Vector4

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Returns true if all four components of A and B differ by no more than ErrorTolerance. The default tolerance of 1e-4 is suitable for most world-space comparisons.

Caveats & Gotchas

• ErrorTolerance is applied per-component, not to the Euclidean distance between the vectors. Two vectors that are within tolerance on each axis individually may still represent visually different directions.
• The default tolerance of 1e-4 was designed for centimetre-scale world coordinates. For normalised vectors (components in [-1, 1]) this tolerance may be too loose; consider using a smaller value like 1e-6.

Signature

static UE_INL_API bool EqualEqual_Vector4Vector4(const FVector4& A, const FVector4& B, float ErrorTolerance = 1.e-4f)

Parameters

Name	Type	Description	Default
A	const FVector4&	First vector.	—
B	const FVector4&	Second vector to compare.	—
ErrorTolerance	float	Maximum per-component absolute difference allowed before vectors are considered unequal.	1.e-4f

Return Type

bool

Example

Fuzzy equality check on computed vectors C++

FVector4 Expected(0.0, 0.0, 1.0, 0.0);
FVector4 Computed = SomeFunction();
if (UKismetMathLibrary::EqualEqual_Vector4Vector4(Computed, Expected, 1e-5f))
{
    // close enough
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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