Create a navigation region for a NavigationRegion2D from a NavigationRegion2D

godot navigation region from collision shape.gd

extends Node2D
@onready var collision_shape_2d: CollisionShape2D = $Area2D/CollisionShape2D
@onready var navigation_region_2d: NavigationRegion2D = $NavigationRegion2D


func _ready() -> void:
	"""
	When object is ready, bake a navigation mesh from its collision shape.
	"""
	var rect: Rect2 = collision_shape_2d.shape.get_rect()
	var a = rect.position + collision_shape_2d.position
	var b = Vector2(rect.position.x + rect.size.x, rect.position.y) + collision_shape_2d.position
	var c = Vector2(rect.position.x, rect.position.y + rect.size.y) + collision_shape_2d.position
	var d = rect.end + collision_shape_2d.position
	

	var new_navigation_mesh = NavigationPolygon.new()
	new_navigation_mesh.agent_radius = 0
	var bounding_outline = PackedVector2Array([a, b, d, c])

	#var bounding_outline = PackedVector2Array([Vector2(0, 0), Vector2(0, 50), Vector2(50, 50), Vector2(50, 0)])
	new_navigation_mesh.add_outline(bounding_outline)
	NavigationServer2D.bake_from_source_geometry_data(new_navigation_mesh, NavigationMeshSourceGeometryData2D.new());
	navigation_region_2d.navigation_polygon = new_navigation_mesh