# init(_:) Creates an external force with the given force vector. ``` init(_ vector: SIMD3) ``` ## Parameters `vector` The force vector, in Newtons. --- 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)