Crashes, No Sound, or Screen Glitches?
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallUse Godot 4’s threaded resource-loading API to keep a loading screen responsive: request the scene with ResourceLoader.load_threaded_request(), poll its status and progress over successive frames, then retrieve and switch to it only after it reports loaded.
Why use threaded loading for a scene transition?
A synchronous load or direct scene change can block the game while the destination scene loads, making the game appear unresponsive. Godot’s background-loading tutorial describes requesting resources for background loading, while its SceneTree documentation notes that a direct scene change can stall until the new scene has loaded and is running. A threaded request lets your current loading interface remain on screen while the resource loads.
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The pattern below assumes a ProgressBar at $ProgressBar whose range is 0 to 100. Attach the script to a loading-screen Control and call start_loading() with the destination scene path.
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extends Control
@onready var progress_bar: ProgressBar = $ProgressBar
var scene_path := "res://levels/level_2.tscn"
var load_started := false
func start_loading(path: String) -> void:
scene_path = path
var request_error := ResourceLoader.load_threaded_request(scene_path)
if request_error != OK:
_show_load_error("Could not start loading: %s" % request_error)
return
load_started = true
func _process(_delta: float) -> void:
if not load_started:
return
var progress: Array = []
var status := ResourceLoader.load_threaded_get_status(scene_path, progress)
match status:
ResourceLoader.THREAD_LOAD_IN_PROGRESS:
if not progress.is_empty():
# The ProgressBar range is 0 through 100.
progress_bar.value = progress[0] * 100.0
ResourceLoader.THREAD_LOAD_LOADED:
load_started = false
var packed_scene := ResourceLoader.load_threaded_get(scene_path) as PackedScene
if packed_scene == null:
_show_load_error("Loaded resource is not a PackedScene.")
return
get_tree().change_scene_to_packed(packed_scene)
ResourceLoader.THREAD_LOAD_FAILED:
load_started = false
_show_load_error("The scene failed to load.")
ResourceLoader.THREAD_LOAD_INVALID_RESOURCE:
load_started = false
_show_load_error("The resource path is invalid or no load was requested.")
func _show_load_error(message: String) -> void:
push_error(message)
# Replace this with a visible retry or error message in a shipped game.The ResourceLoader API reference describes the status values and progress output used here. The progress value is a ratio from 0.0 to 1.0; multiplying by 100 maps it to a bar with a maximum of 100. If your bar’s maximum is 1, assign progress[0] directly instead.
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Keep the loading interface alive
The loading screen must still exist while the request runs. If starting the transition removes the current scene, the progress UI disappears with it. For a transition that crosses scene boundaries, put the loading interface and transition logic in a persistent manager or autoload; Godot’s SceneTree documentation describes implementing a background-loading screen manually with autoloads and background loading.
Once the status is THREAD_LOAD_LOADED, load_threaded_get() retrieves the resource. This example checks that it is a PackedScene before passing it to change_scene_to_packed(). In a different scene architecture, you can instantiate the packed scene and attach it where appropriate; Godot’s background-loading tutorial demonstrates retrieving and instantiating a completed threaded resource.
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Handle progress and loading errors safely
- Check the request result. If
load_threaded_request()does not returnOK, show an error or offer a retry rather than beginning to poll. - Poll on successive frames. Call
load_threaded_get_status()from_process()or another frame-based update. Do not spin in a tight loop waiting for completion. - Do not use retrieval as a progress check. If loading is incomplete,
load_threaded_get()blocks until the resource finishes, which can stall the main thread. Retrieve it only after the status reports loaded. - Handle every terminal state. Stop polling and provide a visible recovery path for
THREAD_LOAD_FAILEDandTHREAD_LOAD_INVALID_RESOURCE, as well as checking that the loaded resource is actually aPackedScene. - Use subthreads deliberately. The ResourceLoader reference cautions that enabling
use_sub_threadscan cause main-thread slowdowns. Leave it at its default unless profiling indicates a reason to change it.
When is a threaded loading screen worthwhile?
A direct scene switch can be adequate for a small scene that loads instantly from cache, but the switch can still stall while loading. For transitions where responsiveness matters, the useful questions are whether the UI stays visible, whether the bar reflects actual threaded resource loading, whether the manager survives the transition, and whether a failure gives the player a way forward. Godot’s documentation does not specify a universal scene-size or loading-time threshold; the right choice depends on the project.
What this approach loads
ResourceLoader is for imported Godot resources such as scenes. It is not a general-purpose loader for arbitrary plain-text files: those use FileAccess, and the ResourceLoader documentation cautions that non-resource files are not exported by default. Check the method signatures and enum names against the Godot 4 minor version used by your project; the background-loading tutorial cited here is for Godot 4.4, while the reviewed SceneTree page is marked current for Godot 4.0.
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