UKismetMathLibrary::LinePlaneIntersection
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticUFUNCTIONBlueprintPure
Description
Finds the point where a line segment crosses a plane, returning both the intersection point and the interpolation factor along the segment.
Caveats & Gotchas
- • T can fall outside the [0, 1] range when the plane intersects the infinite line but not the segment between LineStart and LineEnd — check T if you need to confirm the hit lies on the segment itself.
- • Returns false when the line is parallel to the plane (or nearly so), in which case T and Intersection are left unmodified and must not be read.
- • FPlane stores a normal and distance from origin, not two arbitrary points — construct it with FPlane(PlaneOrigin, PlaneNormal) if that's more convenient, or use LinePlaneIntersection_OriginNormal directly.
Signature
static bool LinePlaneIntersection(const FVector& LineStart, const FVector& LineEnd, const FPlane& APlane, float& T, FVector& Intersection)Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| LineStart | const FVector& | Start point of the line segment. | — |
| LineEnd | const FVector& | End point of the line segment. | — |
| APlane | const FPlane& | The plane to intersect against. | — |
| T | float& | Receives the interpolation factor along the line where the intersection occurs (0 = LineStart, 1 = LineEnd). | — |
| Intersection | FVector& | Receives the world-space point of intersection. | — |
Return Type
bool Example
Find where a trace line crosses a water plane C++
FPlane WaterPlane(FVector(0,0,WaterHeight), FVector::UpVector);
float T;
FVector HitPoint;
bool bHit = UKismetMathLibrary::LinePlaneIntersection(TraceStart, TraceEnd, WaterPlane, T, HitPoint);
if (bHit && T >= 0.f && T <= 1.f)
{
SpawnSplashEffect(HitPoint);
}Tags
Version History
Introduced in: unknown
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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