UKismetMathLibrary::Vector4_SizeSquared
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticUFUNCTIONBlueprintPure
Description
Returns the squared Euclidean length of a FVector4 including all four components: X²+Y²+Z²+W². Avoids the square root cost of Vector4_Size.
Caveats & Gotchas
- • Like Vector4_Size, W contributes to the result. When comparing two 3D vectors stored in Vector4 with W=0, this is equivalent to squaring the 3D length — but non-zero W values will inflate the result unexpectedly.
- • When comparing distances, always compare squared values against each other rather than taking the square root first. This halves the computational cost at the expense of readability.
Signature
static UE_INL_API double Vector4_SizeSquared(const FVector4& A)Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| A | const FVector4& | The vector whose squared magnitude is calculated. | — |
Return Type
double Example
Compare two Vector4 lengths without sqrt C++
FVector4 A(3.0, 4.0, 0.0, 0.0);
FVector4 B(1.0, 1.0, 1.0, 0.0);
// Avoid sqrt — compare squared sizes directly
bool bAIsLonger = UKismetMathLibrary::Vector4_SizeSquared(A) > UKismetMathLibrary::Vector4_SizeSquared(B);
// A squared == 25, B squared == 3 — A is longerVersion History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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