# ForceEffectBase The base protocol for the wrapping force effect structure containing common parameters for all force-effects. ``` protocol ForceEffectBase ``` ## Overview Don’t implement this protocol yourself. Create force effects by calling methods on [`ForceEffect`](/documentation/RealityKit/ForceEffect). ## Topics ### Associated Types [`associatedtype ForceEffectType : ForceEffectProtocol`](/documentation/RealityKit/ForceEffectBase/ForceEffectType) A type that represents the kind of force effect. ### Instance Properties [`var effect: Self.ForceEffectType`](/documentation/RealityKit/ForceEffectBase/effect) Custom force effect parameters. [`var mask: CollisionGroup`](/documentation/RealityKit/ForceEffectBase/mask) Controls which collision groups will be affected by this force effect. [`var orientation: simd_quatf`](/documentation/RealityKit/ForceEffectBase/orientation) Rotation of the force effect relative to the effect’s transform component. [`var position: SIMD3`](/documentation/RealityKit/ForceEffectBase/position) Position of the force effect relative to the effect’s transform component. [`var spatialFalloff: SpatialForceFalloff?`](/documentation/RealityKit/ForceEffectBase/spatialFalloff) Optional strength falloff based on the spatial bounds of the effect. [`var strengthScale: Float`](/documentation/RealityKit/ForceEffectBase/strengthScale) A multiplier that scales the strength of the effect. [`var timedFalloff: TimedForceFalloff?`](/documentation/RealityKit/ForceEffectBase/timedFalloff) Optional strength falloff based on the duration of the effect. ## Relationships ### Conforming Types [`ForceEffect`](/documentation/RealityKit/ForceEffect) --- 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)