UKismetSystemLibrary::DrawDebugLine

function Engine Blueprint Since 4.0

#include "Kismet/KismetSystemLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintCallable

Description

Draws a straight debug line between two world-space points for a set duration.

Caveats & Gotchas

• Compiled out entirely in Shipping and Test builds — the UFUNCTION is DevelopmentOnly, so calls in those configurations silently do nothing.
• A Duration of 0 draws the line for one frame only; call it every Tick if you need a persistent-looking line without using FlushPersistentDebugLines cleanup.
• Negative Duration values make the line persistent until FlushPersistentDebugLines is called.

Signature

static void DrawDebugLine(const UObject* WorldContextObject, const FVector LineStart, const FVector LineEnd, 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 start point.	—
LineEnd	const FVector	World-space end point.	—
LineColor	FLinearColor	Color of the drawn line.	—
Duration	float	How long the line persists, in seconds. 0 draws for a single frame.	0.f
Thickness	float	Line thickness in screen pixels.	0.f
DepthPriority	EDrawDebugSceneDepthPriorityGroup	Whether the line is depth-tested against the scene or always drawn in the foreground.	EDrawDebugSceneDepthPriorityGroup::World

Return Type

void

Example

Draw a line for one second C++

UKismetSystemLibrary::DrawDebugLine(
    this,
    GetActorLocation(),
    GetActorLocation() + GetActorForwardVector() * 200.f,
    FLinearColor::Green,
    1.0f,
    2.0f);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

Feedback

Was this helpful?