this post was submitted on 30 Jul 2024
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How to save "meta" information in a scene (gehirneimer.de)
submitted 3 months ago* (last edited 3 months ago) by BentiGorlich@gehirneimer.de to c/godot@programming.dev
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I am coming from a Unity background and there I just had a component of some custom class in the scene which I could then easily get by calling FindInScene<CustomComponent> or something like that. Not in Godot this doesn't work, because I didn't find a way to get the actual class of an attached script. I always just get GDScript as the class name even though I did specify a custom one.

The information I want to save are things like: where to spawn players, how many laps will this race have, maybe save references to the spawned players, etc.

So how would I save this "meta" information to get by another script in Godot?

EDIT: here is an example: I have a main scene which can load different levels. When loading a level I need to get some information about that level, like: the available spawn points. Inside each level I have a node with a script attached to it that defined class_name LevelMeta and holds the meta information that I need when loading the level. How do I detect this script and the associated meta information?

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[–] unexposedhazard@discuss.tchncs.de 3 points 3 months ago* (last edited 3 months ago) (1 children)

Im not really sure i understand. A scene is just a node with some children, if you want to store and read information from it then you just attach a script to the root node and declare some variables in it no?

If you add some custom node or instance to it, then you just get_node that by its path and access its variables.

[–] BentiGorlich@gehirneimer.de 1 points 3 months ago (1 children)

Yes exactly. but how do I detect a specific script in my scene view? Or in other words: how do I find the source of my meta information in a scene?

[–] unexposedhazard@discuss.tchncs.de 3 points 3 months ago* (last edited 3 months ago) (2 children)

Oh you want to know the name of the script that was previously attached to a node?

get_script().get_path() should return the filepath to the script that you used, not sure if thats what you want tho.

[–] BentiGorlich@gehirneimer.de 1 points 3 months ago (1 children)

I added an example in the thread

[–] unexposedhazard@discuss.tchncs.de 4 points 3 months ago* (last edited 3 months ago) (2 children)

I see, looks like that is actually an issue.

https://github.com/godotengine/godot/issues/21789

Seems like you have to overwrite the get_class function if you want to detect custom classes.

extends Node2D

class_name CustomClass

func get_class(): return "CustomClass"
func is_class(name): return name == "CustomClass" or .is_class(name) 


func _ready():
	print(get_class())
	print(is_class("CustomClass"))
	print(is_class("Node2D"))
[–] BentiGorlich@gehirneimer.de 1 points 3 months ago (1 children)

But is my solution actually a good one?

[–] unexposedhazard@discuss.tchncs.de 2 points 3 months ago* (last edited 3 months ago) (1 children)

Defining a unique class name gets you the same thing as giving each script a unique filename and then differentiating between the get_script().get_path() but i can see how its not as clean for comparison.

Another solution would be to just give all your custom classes a var called "class_id" or something and then you can read that out if you need it.

[–] BentiGorlich@gehirneimer.de 1 points 3 months ago (1 children)

Oh I meant the general solution for getting level / scene meta data 😅

[–] unexposedhazard@discuss.tchncs.de 4 points 3 months ago* (last edited 3 months ago) (1 children)

Im assuming you have a predefined level scene, which you instantiate and add as a child to your main scene. If i were to save a bunch of metadata about that level scene, i would add a dictionary named "level_data" to the script of the root node of that levels scene.

extends Node

var level_data = {
"spawn_point": Vector2(x,y),
...
}

After you instantiate that level from your main scene with:

var level1_tscn = load("res://path/to/tscn")
var level1 = level1_tscn.instantiate()

You can then get or modify the metadata from that instance reference.

print(level1.level_data["spawn_point"])

When you are done you can then add it as a child to the main scene with add_child(level1).

You can also do that right away and access the data later ofcourse, but if the values are needed in the _ready function of the level, then you need to modify them before adding it to the main scene.

[–] BentiGorlich@gehirneimer.de 2 points 3 months ago (2 children)

That seems very nice. Thanks for the input :) I am very much new to Godot and I gotta say most Unity systems in my head still work, but some just let me run against a wall, like the one I described here XD

[–] unexposedhazard@discuss.tchncs.de 2 points 3 months ago

Added something to the previous comment.

Im also not super experienced, i just make unsuccessfull attempts at making games from time to time :) But i do love godot a lot.

[–] unexposedhazard@discuss.tchncs.de 1 points 3 months ago

You generally use the same logic for literally everything in godot.

Spawning a bullet, enemy, item, ui component?

Instantiate, set values, add_child

[–] BentiGorlich@gehirneimer.de 1 points 3 months ago

Ah good find, I will read through that shortly, thanks :)

[–] BentiGorlich@gehirneimer.de 1 points 3 months ago

not the name, the class_name I set inside of the script