Problem with AStarGrid2D, get_id_path returning empty array

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1

Godot Version

4

Question

Hello, I’ve been following a tutorial to make an enemy to chase the player with a grid based movement. The tutorial is this one 2D Enemy movement in Godot 4 using TileMap & AStarGrid2D (youtube.com), but when I test it for the first time, I noticed that the function get_id_path is returning an empty array so the enemy never moves from the spot, and I’ve been trying to figure out why it does not work but I havent been lucky so far.
Here is the code of the enemy movement:

extends Node2D

@onready var player: Area2D = $"../Player"
@onready var tile_map: TileMap = $"../TileMap32"
@onready var sprite: Sprite2D = $Sprite2D
var astar_grid: AStarGrid2D
var used_cells
var is_moving: bool

func _ready():
	position = position.snapped(Vector2.ONE * Global.TILE_SIZE)
	position -= Vector2.ONE * (Global.TILE_SIZE / 2)
	astar_grid = AStarGrid2D.new()
	astar_grid.region = tile_map.get_used_rect()
	astar_grid.cell_size = Vector2(32, 32)
	astar_grid.diagonal_mode = AStarGrid2D.DIAGONAL_MODE_NEVER
	astar_grid.update()
	
	var region_size = astar_grid.region.size
	var region_position = astar_grid.region.position
	
	for x in region_size.x:
		for y in region_size.y:
			var tile_position = Vector2i(
				x + region_position.x,
				y + region_position.y
			)
			var tile_data = tile_map.get_cell_tile_data(0, tile_position)
			if tile_data.get_custom_data("walkable") == true:
				astar_grid.set_point_solid(tile_position)

func _process(delta):
	if is_moving:
		return
	move()

func move():
	var path = astar_grid.get_id_path(
		tile_map.local_to_map(global_position),
		tile_map.local_to_map(player.global_position)
	) 
       # After this function the path array is empty. I checked if the positions were not empty or giving any errors and I think they're fine
	
	if path.size() == 1:
		return
	
	if path.is_empty():
		return
	
	var original_pos = Vector2(global_position)
	global_position = tile_map.map_to_local(path[0])
	sprite.global_position = original_pos
	
	is_moving = true

func _physics_process(delta):
	if is_moving:
		sprite.global_position = sprite.global_position.move_toward(global_position, 1)
		if sprite.global_position != global_position:
			return
		
		is_moving = false
2 
if tile_data.get_custom_data("walkable") == true:
  astar_grid.set_point_solid(tile_position)

Setting a point solid means that it is disabled for pathfinding (like an obstacle). So maybe you should set point solid if walkable is false?

3

Yes haha it was that, I was setting it incorrectly :rofl:
thank you for the pointer

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