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I would take a look on how minecraft was made, using threads to deal with those objects.

Just adding something I notice when debuging, its not the change_scene_to_packed itself that deletes the variables, its something that its executed after it runs in background, I guess its schedulle some startup procedure in another thread.

I tried that... Afther the change_scene_to_packed, every var set or object in the scene is deleted...

This is the code I tried:

scene.add_player( isMe , playerName , nodeId )
var pack: PackedScene = PackedScene.new()
pack.pack(scene)
get_tree().change_scene_to_packed( pack )

in the new scene Node :
...
var playersToCreate: Array[String]
...
func add_player( activePlayer:bool , pName:String , pId:int
playersToCreate.append( str(int(activePlayer)) +","+ pName +","+ str(pId) )

After the change_scene_to_packed, it executes again the var playersToCreate: Array[String] and resets the values, it may be a bug, but it prevents anyone to send any data to a new scene...

I am not sure I was clear, so, this is my point :

scene.add_player( isMe , playerName , nodeId ) ->>> this do nothing ... I need this to do something.

@altria Thanks for replying, I am just trying to send some info to the new scene. Unfurtunally change_scene_to_packed also reset anything the scene have so it also dont work, I also cant see a diference of using pack or not... It may be a bug but I dont know.
Anyway, the only way I could find to send info to a new scene so far ( not using singletons ... ), was to completly change the way the engine works and use a top allways active root node ( same way other node engines works ... ).

I feel its an old problem of godot : https://github.com/godotengine/godot-proposals/issues/1513

I need to send information for a scene to indicate spawner locations , ammount , etc :

var p:PackedScene = load( "res://Scenes/scene.tscn" )
var scene = p.instantiate()
scene.add_player( isMe , playerName , nodeId ) 
get_tree().change_scene_to_packed(p)

The func add_player is called, but when the scene loads it overwide any data in the scene and delete the information.
I saw everywhere, I mean, everybody using singletons to make this works, sorry, singleton is not a solution for me, is there a way to send information to the scene or this is just one more problem godot have and if I want to use it I need to use singletons ???

I didnt switch from Unit from Godot, I started directly with Godot a few months a go, the reasons I despise Unit are 2 :

1. Dot.net dependence and not integrated code editor ( because of this dot.net ) : for me its a very very big limitation, and this is the one reason why I dont use c# in godot also.
2. UnitHub BS : I tried a few times to use Unit, but I was unable to make it works in linux with out unithub, and unithub is a big no for me.
   Adding to that, I tried Unreal as well, it works very very well, I had no problems setting it up, compiling etc, very good performance, but I guess I still prefere coding...

Unfurtunally godot dont have a good physic system for cars...
There is a guy that is building a new one using gdscript : https://www.youtube.com/watch?v=6hEL66P1WQw
In general, if you need very realistic physics, you will need to build something similar, and its quite complicated.

Thanks for the reply. But I am not looking for a external server solution...
Thats insane that godot has nothing to provide in the network area, that itself explains why its not growing...

Hi, I am looking for more complete examples for multiplayer integrations.

Before I ask, I tried the new godot4 ENetMultiplayerPeer solution, it really sucks, and dont work for me.
I found the solution of TCPServer + WebSocketPeer more relaible and interesting, but I could not find good examples, anyone have something to share about it ?