UKismetMathLibrary::Vector_SlerpVectorToDirection
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticBlueprintPure
Description
Spherically interpolates the orientation of a vector toward a target direction, preserving the original vector's magnitude. Traces an arc on the unit sphere rather than a straight line.
Caveats & Gotchas
- • The output magnitude matches the input Vector's magnitude, not Direction's. Rescale after the call if you need a specific length.
- • When Vector and Direction are nearly antiparallel, slerp is numerically unstable and can produce an arbitrary perpendicular result. Add a dot-product guard if antiparallel inputs are possible.
- • Alpha is not clamped — values outside [0, 1] extrapolate beyond the arc endpoints. Clamp manually if your source can exceed this range.
Signature
static UE_INL_API FVector Vector_SlerpVectorToDirection(FVector Vector, FVector Direction, double Alpha);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| Vector | FVector | The starting vector. Its magnitude is preserved in the output. | — |
| Direction | FVector | The target direction to slerp toward. Its magnitude is ignored. | — |
| Alpha | double | Interpolation factor in [0, 1]. 0 returns Vector unchanged; 1 returns Vector's magnitude along Direction. | — |
Return Type
FVector Example
Smoothly steer a homing projectile toward a target C++
FVector CurrentVelocity = Projectile->GetVelocity();
FVector TargetDir = (Target->GetActorLocation() - Projectile->GetActorLocation()).GetSafeNormal();
double SteerStrength = 0.1; // 10% per frame
FVector NewVelocity = UKismetMathLibrary::Vector_SlerpVectorToDirection(CurrentVelocity, TargetDir, SteerStrength);
ProjectileMovement->Velocity = NewVelocity;Tags
Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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