# position(at:) Returns the position of the vertex at the given index. ``` final func position(at vertexIndex: UInt32) -> SIMD3 ``` ## Parameters `vertexIndex` Index of the vertex to get the position for. ## Return Value The position of the specified vertex. ## Discussion If you want to obtain the position for a specific vertex within a specific primitive (for example the third vertex of the 20th triangle in a triangle mesh), you can use [`vertexIndex(at:)`](/documentation/RealityKit/ClothMeshResource/vertexIndex(at:)) to obtain the right vertex index: ```swift let vertexIndex = myMesh.vertexIndex(at: 3 * 19 + 2) let vertexPosition = myMesh.position(at: vertexIndex) print("The third vertex of the 20th triangle is at X=\(vertexPosition.x)") ``` > Warning: This returned position corresponds to the mesh used to generate the bodies, > rather than the bodies themselves. Therefore, this position does not change as the body deforms > when this resource is used in ``doc://com.apple.RealityKit/documentation/RealityKit/ClothBodyComponent/mesh``. --- 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)