UKismetSystemLibrary::CapsuleTraceSingle

function Engine Blueprint Since 4.0

#include "Kismet/KismetSystemLibrary.h"

Access: public Specifiers: staticBlueprintCallable

Description

Sweeps a capsule from Start to End against the given Trace Channel and returns the first blocking hit encountered. Exposed to Blueprint as 'Capsule Trace By Channel'.

Caveats & Gotchas

• HalfHeight is measured from the capsule's center to the tip of a hemisphere endcap (matching UCapsuleComponent's convention), not the height of the cylindrical section alone — using a character capsule's raw CapsuleHalfHeight value here matches its actual collision shape.
• The capsule sweeps upright along its own local Z axis only — there's no orientation parameter, so you can't sweep a capsule lying on its side with this function.
• TraceChannel is a Trace Channel, not an Object Type — use CapsuleTraceSingleForObjects to filter by object classification instead.

Signature

static ENGINE_API bool CapsuleTraceSingle(const UObject* WorldContextObject, const FVector Start, const FVector End, float Radius, float HalfHeight, ETraceTypeQuery TraceChannel, bool bTraceComplex, const TArray<AActor*>& ActorsToIgnore, EDrawDebugTrace::Type DrawDebugType, FHitResult& OutHit, bool bIgnoreSelf, FLinearColor TraceColor = FLinearColor::Red, FLinearColor TraceHitColor = FLinearColor::Green, float DrawTime = 5.0f)

Parameters

Name	Type	Description	Default
WorldContextObject	const UObject*	World context.	—
Start	const FVector	Start of the sweep.	—
End	const FVector	End of the sweep.	—
Radius	float	Radius of the capsule to sweep.	—
HalfHeight	float	Distance from the center of the capsule to the tip of a hemisphere endcap.	—
TraceChannel	ETraceTypeQuery	The trace channel to test against.	—
bTraceComplex	bool	True to test against complex collision, false to test against simplified collision.	—
ActorsToIgnore	const TArray<AActor*>&	Actors to exclude from the trace.	—
DrawDebugType	EDrawDebugTrace::Type	Debug draw mode.	—
OutHit	FHitResult&	Properties of the trace hit.	—
bIgnoreSelf	bool	Whether to ignore the world context actor itself.	—
TraceColor	FLinearColor	Debug draw color for the trace.	FLinearColor::Red
TraceHitColor	FLinearColor	Debug draw color for hits.	FLinearColor::Green
DrawTime	float	How long the debug draw persists, in seconds.	5.0f

Return Type

bool

Example

Sweep a capsule matching a character's collision shape C++

FHitResult Hit;
TArray<AActor*> ActorsToIgnore;
ActorsToIgnore.Add(this);

const FVector Start = GetActorLocation();
const FVector End = Start + GetActorForwardVector() * 200.f;

bool bHit = UKismetSystemLibrary::CapsuleTraceSingle(this, Start, End, 34.f, 88.f, UEngineTypes::ConvertToTraceType(ECC_Pawn), false, ActorsToIgnore, EDrawDebugTrace::ForDuration, Hit, true);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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