UKismetMathLibrary::Sqrt
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticUFUNCTIONBlueprintPure
Description
Returns the square root of A. For performance-sensitive inner loops prefer FMath::InvSqrt or FVector::Size which can use hardware fast-paths.
Caveats & Gotchas
- • Passing a negative value returns NaN; in gameplay code distances and squared lengths can sometimes be negative due to floating-point cancellation, so guard with FMath::Max(0.0, A) before calling.
- • In tight loops that only need a comparison (e.g. is distance < threshold), compare squared values instead of calling Sqrt — FVector::SizeSquared avoids the sqrt entirely.
Signature
static UE_INL_API double Sqrt(double A);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| A | double | The value to compute the square root of. Should be >= 0. | — |
Return Type
double Example
Compute distance between two points C++
FVector A = GetActorLocation();
FVector B = OtherActor->GetActorLocation();
double DistSq = FVector::DistSquared(A, B);
double Dist = UKismetMathLibrary::Sqrt(DistSq);Tags
Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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