UKismetMathLibrary::VSizeSquared
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticUFUNCTIONBlueprintPure
Description
Returns the squared length of a 3D vector without a square root. Use this instead of VSize when you only need to compare magnitudes.
Caveats & Gotchas
- • The result is length-squared — compare against a squared threshold (Threshold * Threshold), not the raw threshold value.
- • Because there is no sqrt, the value grows quadratically. It cannot be used as a linear measure; e.g., doubling the vector quadruples the result.
Signature
static UE_INL_API double VSizeSquared(FVector A);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| A | FVector | The vector whose squared length to compute. | — |
Return Type
double Example
Skip normalization when vector is already unit length C++
double LenSq = UKismetMathLibrary::VSizeSquared(Dir);
FVector SafeDir = (LenSq > SMALL_NUMBER) ? Dir / FMath::Sqrt(LenSq) : FVector::ZeroVector;Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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