--- name: AnimationNodeDefinition last_updated: 2026-10-19T18:06:24Z inherits: - Instance - Object type: class memory_category: Instances summary: "A single node within an animation graph, connected to other nodes through named input pins." --- # Class: AnimationNodeDefinition > A single node within an animation graph, connected to other nodes through > named input pins. ## Description Represents one node in an animation graph, the node-based system that combines animation clips and poses at runtime. Its [NodeType](/docs/reference/engine/classes/AnimationNodeDefinition.md) determines how the node processes animation, such as playing a clip, blending or overlaying two inputs, masking, or adjusting playback speed, while its [NodeId](/docs/reference/engine/classes/AnimationNodeDefinition.md) uniquely identifies it within the graph. Nodes connect to one another through named input pins; changing a node's type resets its input pins to the default set for that type. ## Properties ### Property: AnimationNodeDefinition.NodeId ```json { "type": "string", "access": "ReadOnly", "security": { "read": "RobloxScriptSecurity", "write": "RobloxScriptSecurity" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Data", "capabilities": [ "Animation" ] } ``` A unique identifier used to reference this node among the other nodes in its graph. Defaults to an empty string. ### Property: AnimationNodeDefinition.NodeType ```json { "type": "AnimationNodeType", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Animation", "capabilities": [ "Animation" ] } ``` Determines how the node processes animation within the graph, for example a clip source, an additive or overlay blend, a mask, or a speed adjustment (see [AnimationNodeType](/docs/reference/engine/enums/AnimationNodeType.md)). Defaults to [InvalidNode](/docs/reference/engine/enums/AnimationNodeType.md). Changing this value resets the node's input pins to the default set defined for the new type. ## Methods ### Method: AnimationNodeDefinition:AddInputPin **Signature:** `AnimationNodeDefinition:AddInputPin(pin: string): ()` Appends a named input pin to the end of the ordered input pin list. The order in which pins are added is significant for nodes such as [AnimationNodeType.SequenceNode](/docs/reference/engine/enums/AnimationNodeType.md), [AnimationNodeType.RandomSequenceNode](/docs/reference/engine/enums/AnimationNodeType.md), and [AnimationNodeType.PrioritySelectNode](/docs/reference/engine/enums/AnimationNodeType.md). *Security: None · Thread Safety: Unsafe · Capabilities: Animation* **Parameters:** | Name | Type | Default | Description | |------|------|---------|-------------| | `pin` | `string` | | Name of the input pin to append. Should match the [Name](/docs/reference/engine/classes/ObjectValue.md) of the corresponding [ObjectValue](/docs/reference/engine/classes/ObjectValue.md) wiring child. | **Returns:** `()` ### Method: AnimationNodeDefinition:GetOrderedInputPinNames **Signature:** `AnimationNodeDefinition:GetOrderedInputPinNames(): Array` Returns the current ordered list of input pin names. *Security: None · Thread Safety: Unsafe · Capabilities: Animation* **Returns:** `Array` — The ordered list of input pin names. ### Method: AnimationNodeDefinition:RemoveInputPin **Signature:** `AnimationNodeDefinition:RemoveInputPin(pin: string): ()` Removes the first input pin matching the given name from the ordered pin list. *Security: None · Thread Safety: Unsafe · Capabilities: Animation* **Parameters:** | Name | Type | Default | Description | |------|------|---------|-------------| | `pin` | `string` | | Name of the input pin to remove. Only the first pin matching this name is removed. | **Returns:** `()` ### Method: AnimationNodeDefinition:SetOrderedInputPinNames **Signature:** `AnimationNodeDefinition:SetOrderedInputPinNames(pins: Array): ()` Bulk-replaces the entire ordered input pin list. Use this to reorder pins or apply batch updates in a single call. *Security: None · Thread Safety: Unsafe · Capabilities: Animation* **Parameters:** | Name | Type | Default | Description | |------|------|---------|-------------| | `pins` | `Array` | | The new ordered list of input pin names, replacing the existing list. | **Returns:** `()` ## Events ### Event: AnimationNodeDefinition.InputPinsChanged **Signature:** `AnimationNodeDefinition.InputPinsChanged()` Fires whenever the ordered input pin list is modified. *Security: None · Capabilities: Animation* ## Inherited Members ### From [Instance](/docs/reference/engine/classes/Instance.md) - **Property `Archivable`** (`boolean`): Determines if an Instance and its descendants can be cloned using - **Property `archivable`** (`boolean`): *(deprecated, hidden)* - **Property `Capabilities`** (`SecurityCapabilities`): The set of capabilities allowed to be used for scripts inside this - **Property `IsInSandbox`** (`boolean`): Indicates whether the instance is inside a sandboxed container. - **Property `Name`** (`string`): A non-unique identifier of the Instance. - **Property `Parent`** (`Instance`): Determines the hierarchical parent of the Instance. - **Property `PredictionMode`** (`PredictionMode`): Reflects the client-side prediction mode applied to the instance under - **Property `RobloxLocked`** (`boolean`): A deprecated property that used to protect CoreGui objects. *(hidden)* - **Property `Sandboxed`** (`boolean`): When enabled, the instance can only access abilities in its `Capabilities` - **Property `UniqueId`** (`UniqueId`): A unique identifier for the instance. - **Method `AddTag(tag: string): ()`**: Applies a tag to the instance. - **Method `children(): Instances`**: Returns an array of the object's children. *(deprecated)* - **Method `ClearAllChildren(): ()`**: This method destroys all of an instance's children. - **Method `Clone(): Instance`**: Create a copy of an instance and all its descendants, ignoring instances - **Method `clone(): Instance`**: *(deprecated)* - **Method `Destroy(): ()`**: Sets the Instance.Parent property to `nil`, locks the - **Method `destroy(): ()`**: *(deprecated)* - **Method `FindFirstAncestor(name: string): Instance?`**: Returns the first ancestor of the Instance whose - **Method `FindFirstAncestorOfClass(className: string): Instance?`**: Returns the first ancestor of the Instance whose - **Method `FindFirstAncestorWhichIsA(className: string): Instance?`**: Returns the first ancestor of the Instance for whom - **Method `FindFirstChild(name: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance found with the given name. - **Method `findFirstChild(name: string, recursive?: boolean): Instance`**: *(deprecated)* - **Method `FindFirstChildOfClass(className: string): Instance?`**: Returns the first child of the Instance whose - **Method `FindFirstChildWhichIsA(className: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance for whom - **Method `FindFirstDescendant(name: string): Instance?`**: Returns the first descendant found with the given Instance.Name. - **Method `GetActor(): Actor?`**: Returns the Actor associated with the Instance, if any. - **Method `GetAttribute(attribute: string): Variant`**: Returns the value which has been assigned to the given attribute name. - **Method `GetAttributeChangedSignal(attribute: string): RBXScriptSignal`**: Returns an event that fires when the given attribute changes. - **Method `GetAttributes(): Dictionary`**: Returns a dictionary of the instance's attributes. - **Method `GetChildren(): Instances`**: Returns an array containing all of the instance's children. - **Method `getChildren(): Instances`**: *(deprecated)* - **Method `GetDebugId(scopeLength?: int): string`**: Returns a coded string of the debug ID used internally by Roblox. - **Method `GetDescendants(): Instances`**: Returns an array containing all of the descendants of the instance. - **Method `GetFullName(): string`**: Returns a string describing the instance's ancestry. - **Method `GetStyled(name: string, selector: string?): Variant`**: Returns the styled or explicitly modified value of the specified property, - **Method `GetStyledPropertyChangedSignal(property: string): RBXScriptSignal`**: Returns an event that fires when the given style property changes on the - **Method `GetTags(): Array`**: Gets an array of all tags applied to the instance. - **Method `HasTag(tag: string): boolean`**: Check whether the instance has a given tag. - **Method `IsAncestorOf(descendant: Instance): boolean`**: Returns true if an Instance is an ancestor of the given - **Method `IsDescendantOf(ancestor: Instance): boolean`**: Returns `true` if an Instance is a descendant of the given - **Method `isDescendantOf(ancestor: Instance): boolean`**: *(deprecated)* - **Method `IsPropertyModified(property: string): boolean`**: Returns `true` if the value stored in the specified property is not equal - **Method `QueryDescendants(selector: string): Instances`**: Returns an array containing all descendants of the instance that match the - **Method `Remove(): ()`**: Sets the object's `Parent` to `nil`, and does the same for all its *(deprecated)* - **Method `remove(): ()`**: *(deprecated)* - **Method `RemoveTag(tag: string): ()`**: Removes a tag from the instance. - **Method `ResetPropertyToDefault(property: string): ()`**: Resets a property to its default value. - **Method `SetAttribute(attribute: string, value: Variant): ()`**: Sets the attribute with the given name to the given value. - **Method `WaitForChild(childName: string, timeOut: double): Instance`**: Returns the child of the Instance with the given name. If the - **Event `AncestryChanged`**: Fires when the Instance.Parent property of this object or one of - **Event `AttributeChanged`**: Fires whenever an attribute is changed on the Instance. - **Event `ChildAdded`**: Fires after an object is parented to this Instance. - **Event `childAdded`**: *(deprecated)* - **Event `ChildRemoved`**: Fires after a child is removed from this Instance. - **Event `DescendantAdded`**: Fires after a descendant is added to the Instance. - **Event `DescendantRemoving`**: Fires immediately before a descendant of the Instance is removed. - **Event `Destroying`**: Fires immediately before (or is deferred until after) the instance is - **Event `StyledPropertiesChanged`**: Fires whenever any style property is changed on the instance, including ### From [Object](/docs/reference/engine/classes/Object.md) - **Property `ClassName`** (`string`): A read-only string representing the class this Object belongs to. - **Property `className`** (`string`): *(deprecated)* - **Method `GetPropertyChangedSignal(property: string): RBXScriptSignal`**: Get an event that fires when a given property of the object changes. - **Method `IsA(className: string): boolean`**: Returns true if an object's class matches or inherits from a given class. - **Method `isA(className: string): boolean`**: *(deprecated)* - **Event `Changed`**: Fires immediately after a property of the object changes, with some