# SceneUpdateContext An object that contains information about the scene to update. ``` struct SceneUpdateContext ``` ## Overview RealityKit uses a [`SceneUpdateContext`](/documentation/RealityKit/SceneUpdateContext) to pass information to a [`System`](/documentation/RealityKit/System) about the scene it’s currently updating. ## Topics ### Updating a scene [`var scene: Scene`](/documentation/RealityKit/SceneUpdateContext/scene) The updating scene. [`var deltaTime: TimeInterval`](/documentation/RealityKit/SceneUpdateContext/deltaTime) The number of seconds elapsed since the last update. ### Instance Methods [`func entities(matching: EntityQuery, updatingSystemWhen: SystemUpdateCondition) -> QueryResult`](/documentation/RealityKit/SceneUpdateContext/entities(matching:updatingSystemWhen:)) Returns all entities which pass the query predicate of the query. --- 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)