# ClothMeshResource A mesh resource that defines the topology and shape of a cloth body or a mesh-shaped cloth collider. ``` final class ClothMeshResource ``` ## Overview Use this resource as the mesh for a [`mesh`](/documentation/RealityKit/ClothBodyComponent/mesh) or a [`mesh`](/documentation/RealityKit/ClothMeshShape/mesh). ## Topics ### Creating a cloth mesh [`convenience init(positions: [SIMD3], triangleIndices: [UInt32]) throws`](/documentation/RealityKit/ClothMeshResource/init(positions:triangleIndices:)) Creates a cloth mesh resource from the given vertex positions and triangle indices. [`static func patch(size: SIMD2, targetEdgeLength: Float) throws -> Self`](/documentation/RealityKit/ClothMeshResource/patch(size:targetEdgeLength:)) Creates a rectangular patch mesh with a topology suitable for cloth simulation. [`static func box(size: SIMD3, targetEdgeLength: Float) throws -> Self`](/documentation/RealityKit/ClothMeshResource/box(size:targetEdgeLength:)) Creates a box mesh with a topology suitable for cloth simulation. [`static func sphere(radius: Float, targetEdgeLength: Float) throws -> Self`](/documentation/RealityKit/ClothMeshResource/sphere(radius:targetEdgeLength:)) Creates a sphere mesh with a topology suitable for cloth simulation. [`static func capsule(height: Float, radius: Float, targetEdgeLength: Float) throws -> Self`](/documentation/RealityKit/ClothMeshResource/capsule(height:radius:targetEdgeLength:)) Creates a capsule mesh with a topology suitable for cloth simulation. [`static func cylinder(height: Float, radius: Float, withCaps: Bool, targetEdgeLength: Float) throws -> Self`](/documentation/RealityKit/ClothMeshResource/cylinder(height:radius:withCaps:targetEdgeLength:)) Creates a cylinder mesh with a topology suitable for cloth simulation. [`static let defaultTargetEdgeLength: Float`](/documentation/RealityKit/ClothMeshResource/defaultTargetEdgeLength) Default target edge length for mesh generation. ### Accessing vertex data [`var vertexCount: Int`](/documentation/RealityKit/ClothMeshResource/vertexCount) The number of vertices in the mesh. [`func position(at: UInt32) -> SIMD3`](/documentation/RealityKit/ClothMeshResource/position(at:)) Returns the position of the vertex at the given index. [`func withPositions((Span>) -> Result) -> Result`](/documentation/RealityKit/ClothMeshResource/withPositions(_:)) Provides access to the positions of all the vertices within a callback. [`func vertexIndex(at: UInt32) -> UInt32`](/documentation/RealityKit/ClothMeshResource/vertexIndex(at:)) Returns the vertex index at the given position in the mesh’s flattened primitive index array. [`func vertexIndex(primitive: UInt32, vertex: UInt32) -> UInt32`](/documentation/RealityKit/ClothMeshResource/vertexIndex(primitive:vertex:)) Returns the vertex index of the specified vertex within the specified primitive. [`func vertices(in: ClothVolumeShape, center: SIMD3, orientation: simd_quatf) -> [UInt32]`](/documentation/RealityKit/ClothMeshResource/vertices(in:center:orientation:)) Returns the indices of the vertices that lie inside the given volume shape. ### Inspecting mesh geometry [`var isWatertight: Bool`](/documentation/RealityKit/ClothMeshResource/isWatertight) Indicates whether the mesh is “watertight”. [`var volume: Float?`](/documentation/RealityKit/ClothMeshResource/volume) The volume of the mesh, or `nil` if the mesh is not watertight. ### Initializers [`convenience init(from: MeshResource) throws`](/documentation/RealityKit/ClothMeshResource/init(from:)) Creates a cloth mesh resource from a rendering mesh resource. ### Instance Properties [`var indexCount: Int`](/documentation/RealityKit/ClothMeshResource/indexCount) The number of indices in the mesh. ## Relationships ### Conforms To [`Sendable`](/documentation/Swift/Sendable) [`Equatable`](/documentation/Swift/Equatable) [`Resource`](/documentation/RealityKit/Resource) [`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)