Using AStarGrid2D, when I call get_point_path between two tiles it returns an empty array

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1

Godot Version

Godot 4.6

Question

This is how I’m setting up the AStarGrid2D:

func _ready() -> void:
	astar = AStarGrid2D.new()
	astar.default_compute_heuristic = AStarGrid2D.HEURISTIC_MANHATTAN
	astar.default_estimate_heuristic = AStarGrid2D.HEURISTIC_MANHATTAN
	astar.cell_shape = AStarGrid2D.CELL_SHAPE_ISOMETRIC_DOWN
	astar.cell_size = tile_map.tile_set.tile_size
	astar.diagonal_mode = AStarGrid2D.DIAGONAL_MODE_NEVER
	astar.region = tile_map.get_used_rect()		#Rect2i -> (Vector2(posizione), Vector2(dimensione))
	
	for tile_coord in tile_map.get_used_cells():
		var t_data = tile_map.get_cell_tile_data(tile_coord)
		if t_data and t_data.get_custom_data("obstacle"):
			astar.set_point_solid(tile_coord)
	astar.update()

Inside a Player node I call the get_point_path function:

I already made sure that it enters the state MOVING

func _input(event: InputEvent) -> void:
	#print(event)
	#STATUS -> TURNO ATTIVO
	if _status:
		#MOVIMENTO
		if current_battle_state == battle_states.MOVING:
			#print("Cambiato stato da IDLE a MOVING, selezione percorso")
			#disegna la preview di movimento
			if event is InputEventMouseMotion and not moving:
				var tile_position: Vector2i = tilemap.local_to_map(get_global_mouse_position())							#Prende le coordinate del mouse
				if tilemap.get_cell_atlas_coords(tile_position) != Vector2i(-1, -1) and target_tile != tile_position:	#Controlla se la tile è non vuota ed evita di ricalcolare lo stesso percorso due volte
					target_tile = tile_position
					move_pts = grid.get_point_path(_current_tile, tile_position)
					print(grid.get_point_position(tile_position))
					if move_pts.size() > _movement:
						var too_far_pts: PackedVector2Array = move_pts.slice(_movement, move_pts.size())
						move_pts.resize(_movement+1)
						too_far_path.points = too_far_pts
					else:
						too_far_path.clear_points()
					path_preview.points = move_pts
					SignalBus.emit_signal("mesuring_distance", move_pts.size(), _movement)

Did I mess up the setup for the AStarGrid2D?

2

try allow partial path and check if changes the returned array outcome

grid.get_point_path(_current_tile, tile_position, true)

3

Still returning an empty array

4

I had the same issue after updating to 4.6. It appears there’s been a change to AStarGrid2D, specifically you have to start from a non-solid cell for pathfinding.

5

Yeah, I figured it out a while ago. This exactly was the issue :slight_smile: