UKismetSystemLibrary::DrawDebugArrow

function Engine Blueprint Since 4.0

#include "Kismet/KismetSystemLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintCallable

Description

Draws a directional arrow from LineStart to LineEnd, useful for visualizing forward vectors, velocities, or traces.

Caveats & Gotchas

• Compiled out entirely in Shipping and Test builds since the UFUNCTION is DevelopmentOnly.
• ArrowSize scales the arrowhead only; a very short LineStart-to-LineEnd distance with a large ArrowSize produces a malformed head.

Signature

static void DrawDebugArrow(const UObject* WorldContextObject, const FVector LineStart, const FVector LineEnd, float ArrowSize, FLinearColor LineColor, float Duration=0.f, float Thickness = 0.f, EDrawDebugSceneDepthPriorityGroup DepthPriority = EDrawDebugSceneDepthPriorityGroup::World)

Parameters

Name	Type	Description	Default
WorldContextObject	const UObject*	World context used to resolve which world to draw in.	—
LineStart	const FVector	World-space tail of the arrow.	—
LineEnd	const FVector	World-space tip of the arrow.	—
ArrowSize	float	Size of the arrowhead.	—
LineColor	FLinearColor	Color of the drawn arrow.	—
Duration	float	How long the arrow persists, in seconds. 0 draws for a single frame.	0.f
Thickness	float	Line thickness in screen pixels.	0.f
DepthPriority	EDrawDebugSceneDepthPriorityGroup	Whether the arrow is depth-tested against the scene or always drawn in the foreground.	EDrawDebugSceneDepthPriorityGroup::World

Return Type

void

Example

Visualize velocity direction C++

const FVector Velocity = GetVelocity();
UKismetSystemLibrary::DrawDebugArrow(
    this,
    GetActorLocation(),
    GetActorLocation() + Velocity,
    20.f,
    FLinearColor::Blue,
    0.f,
    2.0f);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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