godot, raycast

RayCastCamera.gd

extends Camera3D

@onready var ray_cast_3d: RayCast3D = $RayCast3D
@export var grid_map: GridMap

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	var mouse_position: Vector2 = get_viewport().get_mouse_position()
	ray_cast_3d.target_position = project_local_ray_normal(mouse_position) * 100.0
	ray_cast_3d.force_raycast_update()
	if ray_cast_3d.is_colliding():
		var collider = ray_cast_3d.get_collider()
		
		if collider is GridMap:
			var collision_point = ray_cast_3d.get_collision_point()
			var cell = grid_map.local_to_map(collision_point)
			Input.set_default_cursor_shape(Input.CURSOR_POINTING_HAND)
			#make sure gride cel isst to item 0
			if Input.is_action_just_pressed("click"):
				if grid_map.get_cell_item(cell) == 0:
					grid_map.set_cell_item(cell, 1)
		else:
			Input.set_default_cursor_shape(Input.CURSOR_ARROW)
		#printt(ray_cast_3d.get_collider(), ray_cast_3d.get_collision_point())