Resource

Inherits: Reference < Object

Inherited By: Animation, AnimationNode, AnimationNodeStateMachinePlayback, AnimationNodeStateMachineTransition, AudioBusLayout, AudioEffect, AudioStream, BakedLightmapData, BitMap, ButtonGroup, CryptoKey, CubeMap, Curve, Curve2D, Curve3D, DynamicFontData, EditorSettings, EditorSpatialGizmoPlugin, Environment, Font, GDNativeLibrary, GIProbeData, GLTFAccessor, GLTFAnimation, GLTFBufferView, GLTFCamera, GLTFCollider, GLTFDocument, GLTFDocumentExtension, GLTFLight, GLTFMesh, GLTFNode, GLTFPhysicsBody, GLTFSkeleton, GLTFSkin, GLTFSpecGloss, GLTFState, GLTFTexture, GLTFTextureSampler, Gradient, Image, InputEvent, Material, Mesh, MeshLibrary, MultiMesh, NavigationMesh, NavigationPolygon, OccluderPolygon2D, OccluderShape, OpenSimplexNoise, PackedDataContainer, PackedScene, PhysicsMaterial, PolygonPathFinder, RichTextEffect, Script, Shader, Shape, Shape2D, ShortCut, Skin, Sky, SpriteFrames, StyleBox, TextFile, Texture, TextureLayered, Theme, TileSet, Translation, VideoStream, VisualScriptNode, VisualShaderNode, World, World2D, X509Certificate

Base class for serializable objects.

Description

Resource is the base class for all Redot-specific resource types, serving primarily as data containers. Since they inherit from Reference, resources are reference-counted and freed when no longer in use. They can also be nested within other resources, and saved on disk. PackedScene, one of the most common Objects in a Redot project, is also a resource, uniquely capable of storing and instantiating the Nodes it contains as many times as desired.

In GDScript, resources can loaded from disk by their resource_path using @GDScript.load or @GDScript.preload.

The engine keeps a global cache of all loaded resources, referenced by paths (see ResourceLoader.has_cached). A resource will be cached when loaded for the first time and removed from cache once all references are released. When a resource is cached, subsequent loads using its path will return the cached reference.

Note: In C#, resources will not be freed instantly after they are no longer in use. Instead, garbage collection will run periodically and will free resources that are no longer in use. This means that unused resources will linger on for a while before being removed.

Tutorials

Properties

bool

resource_local_to_scene

false

String

resource_name

""

String

resource_path

""

Methods

void

_setup_local_to_scene ( ) virtual

Resource

duplicate ( bool subresources=false ) const

void

emit_changed ( )

Node

get_local_scene ( ) const

RID

get_rid ( ) const

void

setup_local_to_scene ( )

void

take_over_path ( String path )

Signals

changed ( )

Emitted when the resource changes, usually when one of its properties is modified. See also emit_changed.

Note: This signal is not emitted automatically for custom resources, which means that you need to create a setter and emit the signal yourself.

Property Descriptions

bool resource_local_to_scene = false

  • void set_local_to_scene ( bool value )

  • bool is_local_to_scene ( )

If true, the resource is duplicated for each instance of all scenes using it. At run-time, the resource can be modified in one scene without affecting other instances (see PackedScene.instance).

Note: Changing this property at run-time has no effect on already created duplicate resources.

String resource_name = ""

An optional name for this resource. When defined, its value is displayed to represent the resource in the Inspector dock. For built-in scripts, the name is displayed as part of the tab name in the script editor.

Note: Some resource formats do not support resource names. You can still set the name in the editor or via code, but it will be lost when the resource is reloaded. For example, only built-in scripts can have a resource name, while scripts stored in separate files cannot.

String resource_path = ""

The unique path to this resource. If it has been saved to disk, the value will be its filepath. If the resource is exclusively contained within a scene, the value will be the PackedScene's filepath, followed by a unique identifier.

Note: Setting this property manually may fail if a resource with the same path has already been previously loaded. If necessary, use take_over_path.

Method Descriptions

void _setup_local_to_scene ( ) virtual

Override this method to customize the newly duplicated resource created from PackedScene.instance, if the original's resource_local_to_scene is set to true.

Example: Set a random damage value to every local resource from an instantiated scene.

extends Resource

var damage = 0

func _setup_local_to_scene():
    damage = rand_range(10, 40)

Resource duplicate ( bool subresources=false ) const

Duplicates this resource, returning a new resource with its exported or @GlobalScope.PROPERTY_USAGE_STORAGE properties copied from the original.

If subresources is false, a shallow copy is returned; nested resources within subresources are not duplicated and are shared from the original resource. If subresources is true, a deep copy is returned; nested subresources will be duplicated and are not shared.

Note: For custom resources, this method will fail if Object._init has been defined with required parameters.

void emit_changed ( )

Emits the changed signal. This method is called automatically for some built-in resources.

Note: For custom resources, it's recommended to call this method whenever a meaningful change occurs, such as a modified property. This ensures that custom Objects depending on the resource are properly updated.

var damage setget set_damage

func set_damage(new_value):
    if damage != new_value:
        damage = new_value
        emit_changed()

Node get_local_scene ( ) const

If resource_local_to_scene is set to true and the resource has been loaded from a PackedScene instantiation, returns the root Node of the scene where this resource is used. Otherwise, returns null.

RID get_rid ( ) const

Returns the RID of this resource (or an empty RID). Many resources (such as Texture, Shape, and so on) are high-level abstractions of resources stored in a specialized server (VisualServer, PhysicsServer, etc.), so this function will return the original RID.

void setup_local_to_scene ( )

Calls _setup_local_to_scene. If resource_local_to_scene is set to true, this method is automatically called from PackedScene.instance by the newly duplicated resource within the scene instance.

void take_over_path ( String path )

Sets the resource_path to path, potentially overriding an existing cache entry for this path. Further attempts to load an overridden resource by path will instead return this resource.