---
title: "init(effect:strengthScale:spatialFalloff:timedFalloff:position:orientation:mask:)"
framework: realitykit
role: symbol
role_heading: Initializer
path: "realitykit/forceeffect/init(effect:strengthscale:spatialfalloff:timedfalloff:position:orientation:mask:)"
---

# init(effect:strengthScale:spatialFalloff:timedFalloff:position:orientation:mask:)

Creates a ForceEffect struct.

## Declaration

```swift
init(effect: ForceEffectType, strengthScale: Double = 1.0, spatialFalloff: SpatialForceFalloff? = nil, timedFalloff: TimedForceFalloff? = nil, position: SIMD3<Float> = SIMD3<Float>(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.