# smoothstep(_:edge0:edge1:) Returns an element-wise smoothly interpolated value between two vectors. ``` func smoothstep(_ x: SIMD4, edge0: SIMD4, edge1: SIMD4) -> SIMD4 ``` --- 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)