# AnimationState The concretely typed animation state structure. ``` struct AnimationState where Value : AnimatableData ``` ## Overview Access the animation state structure from the event structure returned to the action’s `.updated` event handler. Define a valid bind target and matching animation type for the action animation to make the state structure available and non-nil. (See: [`AnimationStateProtocol`](/documentation/RealityKit/AnimationStateProtocol)) ## Topics ### Instance Properties [`var defaultSource: Value?`](/documentation/RealityKit/AnimationState/defaultSource-3pn6r) See: [`defaultSource`](/documentation/RealityKit/AnimationStateProtocol/defaultSource) [`var defaultSource: JointTransforms?`](/documentation/RealityKit/AnimationState/defaultSource-5ddek) Returns the joint transforms representing the default source value. [`var defaultTarget: JointTransforms?`](/documentation/RealityKit/AnimationState/defaultTarget-9kxlt) Returns the joint transforms representing the default target value. [`var defaultTarget: Value?`](/documentation/RealityKit/AnimationState/defaultTarget-gdi6) See: [`defaultTarget`](/documentation/RealityKit/AnimationStateProtocol/defaultTarget) [`let deltaTime: TimeInterval`](/documentation/RealityKit/AnimationState/deltaTime) See: [`deltaTime`](/documentation/RealityKit/AnimationStateProtocol/deltaTime) [`let evaluationTime: TimeInterval`](/documentation/RealityKit/AnimationState/evaluationTime) See [`evaluationTime`](/documentation/RealityKit/AnimationStateProtocol/evaluationTime) [`let normalizedTime: TimeInterval`](/documentation/RealityKit/AnimationState/normalizedTime) See [`normalizedTime`](/documentation/RealityKit/AnimationStateProtocol/normalizedTime) ### Instance Methods [`func defaultSourceJoints(index: Int, count: Int, transforms: inout [Transform]) -> Bool`](/documentation/RealityKit/AnimationState/defaultSourceJoints(index:count:transforms:)) Retrieves a subset of default source joints, and stores them in the output transform array. [`func defaultTargetJoints(index: Int, count: Int, transforms: inout [Transform]) -> Bool`](/documentation/RealityKit/AnimationState/defaultTargetJoints(index:count:transforms:)) Retrieves a subset of default target joints, and stores them in the output transform array. [`func storeAnimatedJoints(transforms: [Transform], jointIndex: Int) -> Bool`](/documentation/RealityKit/AnimationState/storeAnimatedJoints(transforms:jointIndex:)) Stores a subset of animated joints. [`func storeAnimatedValue(ValueType) -> Bool`](/documentation/RealityKit/AnimationState/storeAnimatedValue(_:)) See: [`storeAnimatedValue(_:)`](/documentation/RealityKit/AnimationStateProtocol/storeAnimatedValue(_:)) ## Relationships ### Conforms To [`AnimationStateProtocol`](/documentation/RealityKit/AnimationStateProtocol) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)