# ClothBodyComponent.TargetShape.PositionConstraint A constraint that pulls a particle towards a certain position. ``` struct PositionConstraint ``` ## Topics ### Creating a constraint [`init(position: SIMD3, stiffness: Float)`](/documentation/RealityKit/ClothBodyComponent/TargetShape/PositionConstraint/init(position:stiffness:)) Creates a position constraint with the given target position and stiffness. ### Configuring the constraint [`var stiffness: Float`](/documentation/RealityKit/ClothBodyComponent/TargetShape/PositionConstraint/stiffness) The stiffness by which the particle is pulled towards the position. ### Instance Properties [`var position: SIMD3`](/documentation/RealityKit/ClothBodyComponent/TargetShape/PositionConstraint/position) The target position. ## 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)