UKismetMathLibrary::IsZero2D
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticBlueprintPure
Description
Returns true only if both X and Y are exactly 0.0. This is an exact bitwise check — use IsNearlyZero2D for floating-point safety.
Caveats & Gotchas
- • Floating-point arithmetic almost never produces a perfectly exact zero. A vector set by arithmetic operations (e.g., subtraction or interpolation) will rarely pass this check. Use IsNearlyZero2D in nearly all runtime contexts.
- • Valid use cases for IsZero2D are when you explicitly set a vector to FVector2D::ZeroVector or FVector2D(0, 0) and need to confirm it hasn't been modified.
Signature
static UE_INL_API bool IsZero2D(const FVector2D& A);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| A | const FVector2D& | The 2D vector to check. | — |
Return Type
bool Example
Detect an uninitialised direction vector C++
FVector2D InputDir = GetRawInputDirection();
if (UKismetMathLibrary::IsZero2D(InputDir))
{
// No input this frame
return;
}See Also
Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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