# PerClothVertexData A generic type that stores per-vertex data in a buffer. ``` struct PerClothVertexData ``` ## Topics ### Accessing vertex data [`var vertexCount: Int`](/documentation/RealityKit/PerClothVertexData/vertexCount) The number of vertices this structure holds data for. [`func withElements((Span) -> Result) -> Result`](/documentation/RealityKit/PerClothVertexData/withElements(_:)) Provides read-only access to the per-vertex data within a callback. [`func withMutableElements((inout MutableSpan) -> Result) -> Result`](/documentation/RealityKit/PerClothVertexData/withMutableElements(_:)) Provides mutable access to the per-vertex data within a callback. ### Setting vertex values [`func set(vertexIndices: [UInt32], value: ElementType)`](/documentation/RealityKit/PerClothVertexData/set(vertexIndices:value:)) Sets the data for the given vertex indices to a common value. [`func setAll(value: ElementType)`](/documentation/RealityKit/PerClothVertexData/setAll(value:)) Sets the data for all vertices to a common value. [`func reset()`](/documentation/RealityKit/PerClothVertexData/reset()-1nlsc) Resets the per-vertex data of each vertex to the default position constraint. [`func reset()`](/documentation/RealityKit/PerClothVertexData/reset()-403m8) Resets the per-vertex data of each vertex to a zero-force external force. [`func reset()`](/documentation/RealityKit/PerClothVertexData/reset()-4x5xi) Resets the per-vertex data of each vertex to the default motion type. ### Instance Methods [`func reset()`](/documentation/RealityKit/PerClothVertexData/reset()) Resets the per-vertex data of each vertex to the default position constraint. --- 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)