# init(strength:axis:) Creates a vortex force effect. ``` init(strength: Double, axis: SIMD3) ``` ## Parameters `strength` The magnitude of the force. `axis` The vortex’s rotational axis centered at the effect origin. --- 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)