# init(size:) Creates a box shape with the given size. ``` init(size: SIMD3) ``` ## Parameters `size` The size of the box along each axis. --- 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)