Camera reference from player scene to main scene | Godot Engine | Page 1

noble drum Sep 2, 2024, 12:14 AM

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Hi all, working on trying to get a camera reference working from. my player scene

I have ths in my player script:

@export_node_path("Camera2D") var camera: NodePath

var remote_camera: RemoteTransform2D
# Called when the node enters the scene tree for the first time.
func _ready() -> void:
    assert(camera != null, "No Camera Assigned.")
    print(camera)
    remote_camera.remote_path = camera

i keep getting an error on the last line,

Invalid assignment of property or key 'remote_path' with value of type 'NodePath' on base object of type 'Nil'

I want to have the player in the main scene be able to reference the Game Camera to allow for camera movement to follow the player. I had a RemoteTransform2D when the player was just set as a node in the main scene but since separating it into its own scene, i cant figure out how to do this reference.

I tried doing a web search but I can't get it specific enough for my use case.

Anyy and all help is much appreciated!

untold gust Sep 2, 2024, 7:07 AM

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Maybe this can help
https://kidscancode.org/godot_recipes/4.x/basics/getting_nodes/

Understanding node paths :: Godot 4 Recipes

noble drum Sep 2, 2024, 7:22 AM

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Thanks for the reply, but that’s not quite my issue I think. 🤔 it’s late and the I’m not at my computer right now, I’ll try and sleep on it and provide more info tomorrow (read later today as it’s just after midnight for me) 🙂 Thanks again.

noble drum Sep 3, 2024, 6:31 AM

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So what im trying to do is make it so that in the editor i can assign any Camera2D to the Players' Camera property which in the player script assigns it to the players' internal remote_camera var (it may not be private but isn't directly exposed to the properties in the node inspector).

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In my Game scene, the player has the GameCamera assigned via the editor like so:

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Perhaps it's a timing issue when the node is instantiated?

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vs when the GameCamera is available in the scene tree?

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This is my node hierarchy currently:

vapid fiber Sep 3, 2024, 7:01 AM

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noble drum So what im trying to do is make it so that in the editor i can assign any `Camer...

Can you show a screenshot of your player scene tree?

noble drum Sep 3, 2024, 7:02 AM

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vapid fiber Sep 3, 2024, 7:03 AM

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noble drum Hi all, working on trying to get a camera reference working from. my player scen...

If the script has not changed since then...

@export_node_path("Camera2D") var camera: NodePath

# vvvvv This doesn't appear to be set anywhere
var remote_camera: RemoteTransform2D

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
    assert(camera != null, "No Camera Assigned.")
    print(camera)
    remote_camera.remote_path = camera

noble drum Sep 3, 2024, 7:03 AM

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remote transform 2d is via the code.

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oh

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-_-

vapid fiber Sep 3, 2024, 7:03 AM

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RemoteTransform2D is a Node2D https://docs.godotengine.org/en/stable/classes/class_remotetransform2d.html

noble drum Sep 3, 2024, 7:03 AM

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im stupid lol

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i need to actually just put a RemoteTransferm2D in the player scene

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then i can reference/use that

vapid fiber Sep 3, 2024, 7:04 AM

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Correct

noble drum Sep 3, 2024, 7:04 AM

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wow, haha

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i did have one at ome point

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im so sorry! such a noob issue!

vapid fiber Sep 3, 2024, 7:05 AM

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I've not actually used these remote nodes before, seem like they would be useful

vapid fiber Sep 3, 2024, 7:06 AM

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noble drum im so sorry! such a noob issue!

lol no dramas xD

noble drum Sep 3, 2024, 7:06 AM

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yeah they let you assign a camera to a scene

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and when the scene that references said camera gets freed it doesn't jump the scene back to the origin

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so say the player dies at x 1000 and y 1000

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since the remote transform has modified the "location" of the parent scene

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it stays in place

vapid fiber Sep 3, 2024, 7:07 AM

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gotcha!

noble drum Sep 3, 2024, 7:08 AM

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at least in theory

vapid fiber Sep 3, 2024, 7:08 AM

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I'll assume so! I just saw the error and quickly checked out what a RemoteTransform2D was 😂

noble drum Sep 3, 2024, 7:15 AM

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hmmm the camera isnt' moving the scene around though

vapid fiber Sep 3, 2024, 7:16 AM

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So according to the docs, the remote node with push its own transform to the other

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So you are pushing the transform to the camera

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which means your player is moving the camera around

noble drum Sep 3, 2024, 7:21 AM

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yes, which is the expected behavior but i'ts not actually working currently

vapid fiber Sep 3, 2024, 7:23 AM

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Hmmm the property remote_path expects a NodePath rather than a Node, could that be the issue?

noble drum Sep 3, 2024, 7:23 AM

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ok i think i got what's wrong

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im assigning the node path of the camera to the remote camera node

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but that's not what is needed

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i neeed to assign the camera 2d directly?

vapid fiber Sep 3, 2024, 7:24 AM

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no hang on, your code is using a node path ...

noble drum Sep 3, 2024, 7:25 AM

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right. but if i set editable childeren in the instantiated scene (player within Game) i can assign the GameCamera directly

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but assining it via code doesn't seem to the same as what the GUI does

vapid fiber Sep 3, 2024, 7:26 AM

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I don't see why that would matter

noble drum Sep 3, 2024, 7:26 AM

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me neither 🤔

vapid fiber Sep 3, 2024, 7:26 AM

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The player is just getting a node path of the external camera

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What value does that resolve to?

noble drum Sep 3, 2024, 7:27 AM

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right then the ready function assigns that to the RmeoteCamera2D node

vapid fiber Sep 3, 2024, 7:27 AM

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(I don't use NodePaths personally)

noble drum Sep 3, 2024, 7:28 AM

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in the raw scene file (looking it as text) it just directly assigns

vapid fiber Sep 3, 2024, 7:28 AM

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Suppose that value your player has stored is a local node path, then it wouldn't work

noble drum Sep 3, 2024, 7:28 AM

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camera = NodePath("../GameCamera")

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but that's with editable children

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let me undo those changes then look at the raw file

vapid fiber Sep 3, 2024, 7:30 AM

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Yeah so if your player script has "GameCamera", it will fail

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I think it needs to be "../../GameCamera" for it to work

noble drum Sep 3, 2024, 7:30 AM

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odd it does the same thing

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as with editable children

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so here's the current code

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@export_node_path("Camera2D") var camera: NodePath
@onready var remote_camera = $RemoteCamera

func _ready() -> void:
    assert(!camera.is_empty(), "No Camera Assigned.")
    remote_camera.remote_path = camera
    print(remote_camera)
    var cam = get_node(remote_camera.remote_path)
    print(cam)

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the 2 print messages: ```
RemoteCamera:<RemoteTransform2D#37262198629>
GameCamera:<Camera2D#37278975846>

vapid fiber Sep 3, 2024, 7:34 AM

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This is what the tree looks like

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It needs to go up two levels

noble drum Sep 3, 2024, 7:35 AM

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vapid fiber Sep 3, 2024, 7:35 AM

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So the path should be "../../GameCamera"

noble drum Sep 3, 2024, 7:35 AM

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the player is its own scene

vapid fiber Sep 3, 2024, 7:35 AM

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that's right

noble drum Sep 3, 2024, 7:35 AM

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game scene

vapid fiber Sep 3, 2024, 7:35 AM

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The remote transform is a child of that player node

noble drum Sep 3, 2024, 7:35 AM

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the player has an export

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so the GameCamera can be assigned

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you know, maybe im making this too complicated?

vapid fiber Sep 3, 2024, 7:36 AM

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Not at all

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It is quite straight forward

noble drum Sep 3, 2024, 7:36 AM

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maybe just have it reference a Camera2D directly

vapid fiber Sep 3, 2024, 7:36 AM

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You could, sure

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But either way the node path you give it needs to still work

noble drum Sep 3, 2024, 7:37 AM

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then assign the remote path that way?

vapid fiber Sep 3, 2024, 7:37 AM

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At the very least passing the full path would work too

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Which would resolve to "/root/Game/GameCamera"

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remote_transform.remote_path = camera.get_path()

noble drum Sep 3, 2024, 7:38 AM

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yeah i think that was it

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yeah that's wha ti was doing in the code right?

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camera export was originally a NodePath

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wait you may be right... let me check

vapid fiber Sep 3, 2024, 7:39 AM

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I am not sure how you were setting the NodePath, just saying what it would need to be

noble drum Sep 3, 2024, 7:39 AM

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i think i missed somethign essential, that maybe you even pointed out originally?

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it was being set via the GUI in the export

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drag and drop

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Camera is the NodePath export

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cam is the Camera2D export

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cam works

vapid fiber Sep 3, 2024, 7:40 AM

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noble drum

What value does it give when you hover over it?

noble drum Sep 3, 2024, 7:40 AM

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../GameCamera for "Camera"

vapid fiber Sep 3, 2024, 7:41 AM

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Yep so that is relative to the player node

noble drum Sep 3, 2024, 7:41 AM

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same for "Cam"

vapid fiber Sep 3, 2024, 7:41 AM

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Which won't work, since you are passing that path to a child node

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It seems that node path exports are not very useful for anything outside of their own scene

noble drum Sep 3, 2024, 7:43 AM

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ah, that's probably it

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yeah i think the solution is to just have the GUI assign a reference to a Camera2D directly

vapid fiber Sep 3, 2024, 7:44 AM

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I would concur

noble drum Sep 3, 2024, 7:45 AM

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then in code assign that node path to the RemoteTransform2D.remote_path

vapid fiber Sep 3, 2024, 7:45 AM

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Yep. That would work and cross your fingers that particular node doesn't change heirarchy

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Otherwise, you'd need to set it again I'd imagine

noble drum Sep 3, 2024, 7:46 AM

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so the solution is:

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@export var camera: Camera2D
@onready var remote_camera = $RemoteCamera

func _ready() -> void:
    assert(camera != null, "No Camera Assigned.")
    remote_camera.remote_path = camera.get_path()

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thanks for helping out @vapid fiber 🙂

vapid fiber Sep 3, 2024, 7:48 AM

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idk honestly, if you find out could you le me know?

#Camera reference from player scene to main scene