add_child: I can't add "cube2" gold to "world", I already get a parent "world" error

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1
:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By SDGN16

I added code to the home screen that adds an object every 3 seconds, but I’m getting errors.

add_child: Can’t add child ‘cube1’ to ‘world’, already has a parent ‘world’.
add_child: Can’t add child ‘cube2’ to ‘world’, already has a parent ‘world’.
add_child: Can’t add child ‘cube3’ to ‘world’, already has a parent ‘world’.

world.gd

extends Spatial
var obj1 = load("res://cube1.tscn")
var obj2 = load("res://cube2.tscn")
var obj3 = load("res://cube3.tscn")
var ins1 = obj1.instance()
var ins2 = obj2.instance()
var ins3 = obj3.instance()
var rng = RandomNumberGenerator.new()
func f():
	rng.randomize()
	var ran = rng.randi_range(1,3)
	if ran == 1:
		self.add_child(ins1)
	if ran == 2:
		self.add_child(ins2)
	if ran == 3:
		self.add_child(ins3)
	else:
		pass
func _on_tm_timeout():
	f()

the code inside the scenes added to the screen (cube1.gd,cube2.gd,cube3.gd)

extends StaticBody
var v = Vector3(0,1,-50)

func _process(_delta):
	if v.z > 0:
		self.queue_free()
	else:
		v.z += 0.1
		self.set_translation(v)

I’m trying to make an endless simple running game.

2
:bust_in_silhouette: Reply From: Lopy

You are adding the exact same object repeatedly, what you want to do is add clones of it. That gives you add_child(obj1.instance()).

I didn’t know you could use this like that, thanks. :slight_smile:

SDGN16 | 2021-01-30 22:26

3

I get the same error but Im using the add_child(instance())

func _ready():

var room = load("res://Assets/corridor_6.tscn")
var roomAmount = 0  
var instance = room.instantiate()
var marker = get_node("Marker3D")

add_child(instance)
instance.translate(Vector3(0, 0, 0,))
roomAmount += 1
print("add")

while roomAmount < 6:
	
	add_child(instance)
	instance.translate(Vector3(6, 1, 0,))
	roomAmount +=1
	print("add")
	print(roomAmount)
5

Thank you for the answer.

So it’s because the load scene variable isn’t inside of the while loop?
I thought it could just grab it from the top.

So it doesn’t read anything from outside the loop?

7

In this example you name all the var instances differently. 1,2,3,4 etc.
But in the while loop you can just name it once and it works.Why is this?