# Events Respond to things happening in your RealityKit scene by subscribing to specific event types. ## Overview You can receive notifications to specific RealityKit events — all of which conform to the Event protocol — by subscribing to specific events. The kinds of events you can subscribe to include the following: - Two entities colliding - An entity receiving a new component - Audio playback reaching the end of its content For example, you can receive a notification: - When two objects begin colliding by subscribing to [`CollisionEvents.Began`](/documentation/RealityKit/CollisionEvents/Began) event - When the scene redraws by subscribing to the [`SceneEvents.Update`](/documentation/RealityKit/SceneEvents/Update) event ## Topics ### Core event types [`protocol Event`](/documentation/RealityKit/Event) A type that can be sent as an event. [`protocol EventSource`](/documentation/RealityKit/EventSource) A type on which events can be published and subscribed. [`struct EventSubscription`](/documentation/RealityKit/EventSubscription) A subscription to an event. ### Scene and entity lifecycle events [`enum SceneEvents`](/documentation/RealityKit/SceneEvents) Events the scene invokes. [`enum AnchorStateEvents`](/documentation/RealityKit/AnchorStateEvents) Events that trigger on an entity to indicate a change in anchor state. [`enum ComponentEvents`](/documentation/RealityKit/ComponentEvents) Provides the events related to components. ### Input and interaction events [`enum AccessibilityEvents`](/documentation/RealityKit/AccessibilityEvents) [`enum ManipulationEvents`](/documentation/RealityKit/ManipulationEvents) Events that occur while a person manipulates an entity. ### Physics and motion events [`enum AnimationEvents`](/documentation/RealityKit/AnimationEvents) Notable milestones that the framework signals during animation playback. [`enum CollisionEvents`](/documentation/RealityKit/CollisionEvents) [`enum PhysicsSimulationEvents`](/documentation/RealityKit/PhysicsSimulationEvents) Types of events that fire during physics simulations ### Media events [`enum AudioEvents`](/documentation/RealityKit/AudioEvents) Events associated with audio playback. [`enum VideoPlayerEvents`](/documentation/RealityKit/VideoPlayerEvents) Events associated with video playback for VideoPlayerComponent. [`enum ImagePresentationEvents`](/documentation/RealityKit/ImagePresentationEvents) Events associated with viewing mode transitions for image presentation components. ### Network synchronization events [`enum SynchronizationEvents`](/documentation/RealityKit/SynchronizationEvents) Events associated with network synchronization of scene information. --- 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)