# VortexForceEffect A force effect whose forces circulate around an axis centered at the origin of the effect. ``` struct VortexForceEffect ``` ## Topics ### Initializers [`init(strength: Double, axis: SIMD3)`](/documentation/RealityKit/VortexForceEffect/init(strength:axis:)) Creates a vortex force effect. ### Instance Properties [`let axis: SIMD3`](/documentation/RealityKit/VortexForceEffect/axis) The vortex’s rotational axis centered at the origin of the effect. [`var forceMode: ForceMode`](/documentation/RealityKit/VortexForceEffect/forceMode) The type of force this effect applies. [`var parameterTypes: PhysicsBodyParameterTypes`](/documentation/RealityKit/VortexForceEffect/parameterTypes) The input rigid body parameters. [`let strength: Float`](/documentation/RealityKit/VortexForceEffect/strength) The magnitude of the force. ### Instance Methods [`func update(parameters: inout ForceEffectParameters)`](/documentation/RealityKit/VortexForceEffect/update(parameters:)) Calculates the vortex forces for rigid bodies from the force effect. ## Relationships ### Conforms To [`Encodable`](/documentation/Swift/Encodable) [`ForceEffectProtocol`](/documentation/RealityKit/ForceEffectProtocol) [`Decodable`](/documentation/Swift/Decodable) --- 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)