# convert(direction:to:) Converts a direction vector from the local space of the entity on which you called this method to the local space of a reference entity. ``` @MainActor @preconcurrency func convert(direction: SIMD3, to referenceEntity: Entity?) -> SIMD3 ``` ## Parameters `direction` The direction vector given in the local space of the entity. `referenceEntity` The entity that defines a frame of reference. Set this to `nil` to indicate world space. ## Return Value The direction vector specified relative to `referenceEntity`. --- 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)