# axis A 3D vector that points in the direction of the axis around which to rotate. ``` var axis: SIMD3 { get set } ``` ## Discussion You can rotate an object around any axis. For example, if you set a `1` in the vector’s x-coordinate, rotation occurs around the x-axis, as in the following code. ```swift orbitAnimation.axis = SIMD3(x: 1.0, y: 0.0, z: 0.0) ``` --- 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)