Help needed transitioning enemy scene into object,and back into enemy scene

Help Programming
, , ,
1

Godot Version

4.5

Question

I need help changing an enemy scene into an object scene and back into the original scene

I,ve been working on puting together a prototype where the player hits enemies to change them into objects, and is able to hit them back into enemies if needed.I’ve been able to put together a hitbox and hurtbox system that works by working off some tutorials on youtube, however, it seems as though the hitbox hits it infinitly leading to a “Cannot call method ‘instantiate’ on a null value.” error.

class_name Hurtbox
extends Area2D

@export_subgroup(“Transformation”)
@export var target:Node2D
@export var transformation : PackedScene
@export var hurtbox_lifetime : float =0.05

func _process(delta: float) → void:
if hurtbox_lifetime > 0.0:
var new_timer = Timer.new()
add_child(new_timer)
new_timer.timeout.connect(add_child)
new_timer.call_deferred(“start” , hurtbox_lifetime)

func _ready() → void:
monitoring = false

set_collision_layer_value(1,false)
set_collision_layer_value(2,true)

func receive_hit(_target) ->void:
print(“I’m Hit!!”)
var instance = transformation.instantiate()
target.add_sibling(instance)
target.remove_child(target)

class_name Hitbox
extends Area2D
@export_subgroup(“Properties”)
@export var hitbox_lifetime:float
@export var shape: Shape2D

func _init(_hitbox_lifetime:float, _shape:Shape2D ):
hitbox_lifetime=_hitbox_lifetime
shape=_shape

func _ready() → void:
monitorable = false
area_entered.connect(_on_area_entered)

if hitbox_lifetime > 0.0:
	var new_timer = Timer.new()
	add_child(new_timer)
	new_timer.timeout.connect(queue_free)
	new_timer.call_deferred("start" , hitbox_lifetime)

if shape:
	var collision_shape = CollisionShape2D.new()
	collision_shape.shape = shape
	add_child(collision_shape)

set_collision_layer_value(1,false)
set_collision_mask_value(1,false)
set_collision_mask_value(2,true)

func _on_area_entered(area: Area2D) → void:
if not area.has_method(“receive_hit”):
return

area.receive_hit(null)

Any help is greatly appreciated.

2

Did you assign a packed scene resource to transformation property in the inspector?

3

yes,I did from both enemy to object and object back to enemy

4

Which line causes the error?

5

On the object hurtbox.

6

Sadly @exported packed scenes can cause a cyclical reference error, this silently fails after loading the first time. Try exporting the filepath instead with @export_file("*.tscn") var instance_path: String, then loading it before instantiating.

7

I tried but it gave me an error “Cannot find member “instantiate” in base “String”.”

8

You must load it first

var transformation = load(instance_path)
var instance = transformation.instantiate()
9

That has worked, though now the object spawns and despawns within a frame, though thanks a bunch that was a huge help!