UKismetMathLibrary::Vector_SlerpNormals
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticBlueprintPure
Description
Performs a spherical linear interpolation (slerp) between two normalized direction vectors, tracing the shortest arc on the unit sphere from NormalA to NormalB.
Caveats & Gotchas
- • Both inputs must be normalized (unit length). Passing non-unit vectors produces incorrect results — the function does not normalize internally. Call GetSafeNormal() on inputs before passing.
- • When NormalA and NormalB are antiparallel (dot product ≈ -1), the shortest arc is undefined; the function may return an arbitrary perpendicular vector. Add a dot-product guard if this edge case is possible.
- • Alpha is not clamped. Values outside [0, 1] extrapolate past the arc endpoints.
Signature
static UE_INL_API FVector Vector_SlerpNormals(FVector NormalA, FVector NormalB, double Alpha);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| NormalA | FVector | Starting normalized direction vector. | — |
| NormalB | FVector | Ending normalized direction vector. | — |
| Alpha | double | Interpolation factor in [0, 1]. 0 returns NormalA; 1 returns NormalB. | — |
Return Type
FVector Example
Blend two surface normals for a procedural deformation effect C++
FVector SurfaceNormal = HitResult.ImpactNormal;
FVector UpNormal = FVector::UpVector;
float BlendAlpha = 0.6f;
FVector BlendedNormal = UKismetMathLibrary::Vector_SlerpNormals(SurfaceNormal, UpNormal, BlendAlpha);
// Use BlendedNormal to orient a decal or particle emission directionTags
Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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