# init(effect:strengthScale:spatialFalloff:timedFalloff:position:orientation:mask:) Creates a ForceEffect struct. ``` init(effect: ForceEffectType, strengthScale: Double = 1.0, spatialFalloff: SpatialForceFalloff? = nil, timedFalloff: TimedForceFalloff? = nil, position: SIMD3 = SIMD3(0, 0, 0), orientation: simd_quatf = simd_quaternion(0, 0, 0, 1), mask: CollisionGroup = .all) ``` ## Parameters `effect` Effect specific parameters. `strengthScale` Scales the overall strength of the effect. `spatialFalloff` The falloff function parameters used to attenuate the force based on distance from the effect origin. `timedFalloff` The falloff function parameters used to attenuate the force based on time. `position` The position of the effect relative to the effect entity’s transform. `orientation` The orientation of the effect relative to the effect entity’s transform. `mask` The mask used to select which groups of rigid bodies the effect should be applied to. --- 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)