What are Outlines in Navigation2D for?

:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By genete
:warning: Old Version Published before Godot 3 was released.

If we have defined the vertices and the polygons in the NavigationPolygonInstance, what is the mission of the Outlines?

I’ve manually removed the outlines from the resource and it just happens that they are not shown on the editor… And so you cannot edit the polygon in the editor…

So are the outlines only for editor use?