Godot3如何调用在另一个场景中创建的对象的方法

Question

我正在尝试创建一个 Space Blaster 游戏。我已经创建了主要场景，其中包括玩家精灵和附加的脚本。

我可以创建对象的实例（一颗子弹），当按下 space 栏时它会出现在主场景中。当我尝试调用 start_at() 方法时，它找不到 method/function。基本 Node2D

中不存在函数 'start_at()'

extends Sprite

# Declare member variables here.
export var rot_speed = 2.6
export var thrust = 500
export var max_vel = 400
export var friction = 0.65
var bullet = preload("res://Scenes/Firing.tscn")

# Called when the node enters the scene tree for the first time.
func _ready():
    position = Vector2(get_viewport().size.x/2, get_viewport().size.y/2)


func _process(delta):
    rotation = self.rotation + deg2rad(90 * delta)
    ...

func shoot():
    var b = bullet.instance()
    #bullet_container.add_child(b)
    add_child(b)
    #b.set_position(position)
    #b.set_rotation(rot - PI/2)
    b.start_at(rotation, position)

带有调用函数的项目符号代码：

extends Area2D

# Declare member variables here. Examples:
var vel = Vector2()
export var speed = 1000

# Called when the node enters the scene tree for the first time.
func _ready():
    set_physics_process(true)


func _physics_process(delta):
    vel = vel * delta
    position = position + vel  * delta
    #position = position + vel * delta

# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#   pass

func start_at(dir, pos):
    self.rotation = dir
    self.posiiton = pos
    vel = Vector2(speed, 0).rotated(dir)

请轻点，这是我第一次尝试使用 Godot。

Answer 1

错误消息告诉我们您调用 start_at() 的实例不是项目符号。该实例的类型也是 Node2D 而不是 Area2D。场景“res://Scenes/Firing.tscn”是正确的场景吗？也许子弹脚本不在那个场景的根上？

Godot3如何调用在另一个场景中创建的对象的方法

Godot3 How can I call a method of an object created in another scene

function

instance

scene

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