# uv3s The uv3s buffer, if the custom deformer author specified it ``` let uv3s: MeshDeformParameter.VertexBuffers.Data? ``` --- 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)