As one of the most important classes, the [SceneTree] manages the hierarchy of nodes in a scene as well as scenes themselves. Nodes can be added, retrieved and removed. The whole scene tree (and thus the current scene) can be paused. Scenes can be loaded, switched and reloaded.
You can also use the [SceneTree] to organize your nodes into groups: every node can be assigned as many groups as you want to create, e.g. an "enemy" group. You can then iterate these groups or even call methods and set properties on all the group's members at once.
Calls [code]method[/code] on each member of the given group. You can pass arguments to [code]method[/code] by specifying them at the end of the method call. If a node doesn't have the given method or the argument list does not match (either in count or in types), it will be skipped.
[b]Note:[/b] [method call_group] will call methods immediately on all members at once, which can cause stuttering if an expensive method is called on lots of members. To wait for one frame after [method call_group] was called, use [method call_group_flags] with the [constant GROUP_CALL_DEFERRED] flag.
Calls [code]method[/code] on each member of the given group, respecting the given [enum GroupCallFlags]. You can pass arguments to [code]method[/code] by specifying them at the end of the method call. If a node doesn't have the given method or the argument list does not match (either in count or in types), it will be skipped.
[b]Note:[/b] Group call flags are used to control the method calling behavior. By default, methods will be called immediately in a way similar to [method call_group]. However, if the [constant GROUP_CALL_DEFERRED] flag is present in the [code]flags[/code] argument, methods will be called with a one-frame delay in a way similar to [method Object.set_deferred].
Returns [constant OK] on success, [constant ERR_CANT_OPEN] if the [code]path[/code] cannot be loaded into a [PackedScene], or [constant ERR_CANT_CREATE] if that scene cannot be instantiated.
[b]Note:[/b] The scene change is deferred, which means that the new scene node is added on the next idle frame. You won't be able to access it immediately after the [method change_scene] call.
[b]Note:[/b] The scene change is deferred, which means that the new scene node is added on the next idle frame. You won't be able to access it immediately after the [method change_scene_to] call.
Returns a [SceneTreeTimer] which will [signal SceneTreeTimer.timeout] after the given time in seconds elapsed in this [SceneTree]. If [code]process_always[/code] is set to [code]false[/code], pausing the [SceneTree] will also pause the timer.
[b]Note:[/b] [method notify_group] will immediately notify all members at once, which can cause stuttering if an expensive method is called as a result of sending the notification lots of members. To wait for one frame, use [method notify_group_flags] with the [constant GROUP_CALL_DEFERRED] flag.
[b]Note:[/b] Group call flags are used to control the notification sending behavior. By default, notifications will be sent immediately in a way similar to [method notify_group]. However, if the [constant GROUP_CALL_DEFERRED] flag is present in the [code]flags[/code] argument, notifications will be sent with a one-frame delay in a way similar to using [code]Object.call_deferred("notification", ...)[/code].
Quits the application at the end of the current iteration. Argument [code]exit_code[/code] can optionally be given (defaulting to 0) to customize the exit status code.
By convention, an exit code of [code]0[/code] indicates success whereas a non-zero exit code indicates an error.
For portability reasons, the exit code should be set between 0 and 125 (inclusive).
[b]Note:[/b] On iOS this method doesn't work. Instead, as recommended by the iOS Human Interface Guidelines, the user is expected to close apps via the Home button.
Returns [constant OK] on success, [constant ERR_UNCONFIGURED] if no [member current_scene] was defined yet, [constant ERR_CANT_OPEN] if [member current_scene] cannot be loaded into a [PackedScene], or [constant ERR_CANT_CREATE] if the scene cannot be instantiated.
[b]Note:[/b] [method set_group] will set the property immediately on all members at once, which can cause stuttering if a property with an expensive setter is set on lots of members. To wait for one frame, use [method set_group_flags] with the [constant GROUP_CALL_DEFERRED] flag.
[b]Note:[/b] Group call flags are used to control the property setting behavior. By default, properties will be set immediately in a way similar to [method set_group]. However, if the [constant GROUP_CALL_DEFERRED] flag is present in the [code]flags[/code] argument, properties will be set with a one-frame delay in a way similar to [method Object.call_deferred].
Sets a custom [MultiplayerAPI] with the given [code]root_path[/code] (controlling also the relative subpaths), or override the default one if [code]root_path[/code] is empty.
If [code]false[/code], you need to manually call [method MultiplayerAPI.poll] to process network packets and deliver RPCs. This allows running RPCs in a different loop (e.g. physics, thread, specific time step) and for manual [Mutex] protection when accessing the [MultiplayerAPI] from threads.
This signal is only emitted in the editor, it allows the editor to update the visibility of disabled nodes. Emitted whenever any node's [member Node.process_mode] is changed.
