# init(startPoint:endPoint:radius:isBidirectional:label:) ``` init(startPoint: SIMD3, endPoint: SIMD3, radius: Float, isBidirectional: Bool = true, label: String = "") ``` --- 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)