# init(position0:position1:position2:) Creates a plane from three positions. ``` init(position0 p0: SIMD3, position1 p1: SIMD3, position2 p2: SIMD3) ``` ## Parameters `p0` The first position on the plane. `p1` The second position on the plane. `p2` The third position on the plane. ## Discussion The plane’s outward normal is computed as `cross(p1 − p0, p2 − p1)`, so the three positions wind counterclockwise when viewed from the outward (culled) side of the plane. --- 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)