# init(position:extents:) Creates a volume with the given center position and extents. ``` init(position: SIMD3 = .zero, extents: SIMD3) ``` ## Parameters `position` The center of the volume in portal-local space, in meters. Defaults to `.zero`. `extents` The full lengths (width, height, depth) of the volume in portal-local space, in meters. --- 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)