Daily Unreal Column #48 - Debug Drawing

Visualizing your data is sometimes the easiest way to understand what is going on inside your system. Here is a set of helper functions that make adding debug drawing trivial.

Unreal Engine has a lot of helper debug drawing functions inside DrawDebugHelpers.h file. Some of the most common ones are:

• DrawDebugLine

• DrawDebugPoint

• DrawDebugBox

• DrawDebugSphere

• many, many more

Here is an example usage:

DrawDebugLine(
	GetWorld(), 
	GetActorLocation(), 
	GetActorLocation() + GetActorForwardVector() * 100.0, 
	FColor::Green);

This will result in a green line drawn from the center of the actor showing its forward vector.

Here is an example how DrawDebugLine and DrawDebugCircleArc look like in game view: