NavigationServer2D to generate path

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1

Godot Version

4.4

Question

I want to use the NavigationServer2D to generate a path between two points on a TileMap with a navigation layer. The TileMap and active navigation with an agent is working properly.

The idea is to generate a path for a npc on Map X while the player is on Map Y.
I tried to load the map and get the NavigationRegion2D to have this as PathQueryParameters.map
but it doesnt generate a path, its empty.

Then i tried to load the Map X in a Subviewport to get the navigation map via temp_viewport.get_world_2d().navigation_map.
Also here i had no luck.

Is there a way?

I tried with both functions, “get_navigation_path” and “generate_path”.

		var this_map
		this_map = Utility.load_from_file(map_key_from_order, ".tscn", Directories.maps_scenes_dir)
					
		var target_map_instance = this_map.instantiate()

		var temp_viewport = SubViewport.new()
		add_child(temp_viewport)
		temp_viewport.world_2d = World2D.new()
		temp_viewport.add_child(target_map_instance)

		var target_navigation_map = temp_viewport.get_world_2d().navigation_map
		print("TEMP VIEWPORT Navigationsmap: " + str(target_navigation_map))
		
		## generate the current path
		#npc.current_path = generate_path(target_navigation_map, start_location, end_location)
		npc.current_path = get_navigation_path(target_navigation_map, start_location[0], end_location[0])
		
		
		
func get_navigation_path(target_navigation_map, p_start_position: Vector2, p_target_position: Vector2) -> PackedVector2Array:
	if not is_inside_tree():
		return PackedVector2Array()

	var default_map_rid: RID = target_navigation_map
	var path: PackedVector2Array = NavigationServer2D.map_get_path(
		default_map_rid,
		p_start_position,
		p_target_position,
		true,
		31
	)
	print("this path: " + str(path))
	return path
	
	
func generate_path(navigation_region, start_point, end_point):
	
	if not navigation_region:
		push_error("NavigationRegion2D or Path2D not assigned in Inspector!")
		return

	if start_point.is_empty() or end_point.is_empty():
		push_error("No Start or Endpoint set")
		return

	# NavigationServer2D: Pfad berechnen
	
	var PathQueryParameters = NavigationPathQueryParameters2D.new()
	PathQueryParameters.start_position = start_point[0]
	PathQueryParameters.target_position = end_point[0]
	PathQueryParameters.map = navigation_region
	
	var query_result = NavigationPathQueryResult2D.new()
	NavigationServer2D.query_path(PathQueryParameters, query_result)
	
	if query_result.path.size() == 0:
		push_error("Path could not be generated")
		return
2

I could solve it.
Cause the NavigationServer needs some time to update and synchronize all the stuff we need
to force update and wait the next frame:

var target_navigation_map = subviewport.get_world_2d().get_navigation_map()

NavigationServer2D.map_force_update(target_navigation_map)	
await Engine.get_main_loop().process_frame