# entities(matching:updatingSystemWhen:) Returns all entities which pass the query predicate of the query. ``` func entities(matching query: EntityQuery, updatingSystemWhen condition: SystemUpdateCondition) -> QueryResult ``` ## Parameters `query` The query identifying which entities you want to fetch. `condition` How often the [`System`](/documentation/RealityKit/System) is updated (if the query is not empty). ## Discussion Calling this function can increase the rate at which RealityKit calls the [`update(context:)`](/documentation/RealityKit/System/update(context:)) method. If `condition` is not met for the current update, this method returns an empty result. --- 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)