# USDPlayer.DeformationData.BlendShapeData.Update Delta update carrying only the blend shape fields that changed since the last frame. ``` struct Update ``` ## Topics ### Instance Properties [`let positionOffsets: [[SIMD3]]?`](/documentation/USDKit/USDPlayer/DeformationData/BlendShapeData/Update/positionOffsets) Changed position delta offsets. [`let weights: [Float]?`](/documentation/USDKit/USDPlayer/DeformationData/BlendShapeData/Update/weights) Changed blend shape weights. ## Relationships ### Conforms To [`Sendable`](/documentation/Swift/Sendable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- 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)