<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "macCatalyst: 18.0.0 -",
    "macOS: 15.0.0 -",
    "tvOS: 26.0.0 -",
    "visionOS: 2.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "RealityKit",
  "identifier" : "/documentation/RealityKit/RadialForceEffect",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "RealityKit"
    ],
    "preciseIdentifier" : "s:17RealityFoundation17RadialForceEffectV"
  },
  "title" : "RadialForceEffect"
}
-->

# RadialForceEffect

A force effect that pulls objects toward its center with a spring-like (distance dependent) force.

```
struct RadialForceEffect
```

## Topics

### Initializers

[`init(strength: Double, restDistance: Double)`](/documentation/RealityKit/RadialForceEffect/init(strength:restDistance:))

Creates a radial force effect.

### Instance Properties

[`var forceMode: ForceMode`](/documentation/RealityKit/RadialForceEffect/forceMode)

The type of force this effect applies.

[`var parameterTypes: PhysicsBodyParameterTypes`](/documentation/RealityKit/RadialForceEffect/parameterTypes)

The input rigid body parameters.

[`let restDistance: Float`](/documentation/RealityKit/RadialForceEffect/restDistance)

A distance at which the rigid bodies receive zero radial force.

[`let strength: Float`](/documentation/RealityKit/RadialForceEffect/strength)

The magnitude of the force.

### Instance Methods

[`func update(parameters: inout ForceEffectParameters)`](/documentation/RealityKit/RadialForceEffect/update(parameters:))

Calculates the radial forces for rigid bodies from the force effect.

## Relationships

### Conforms To

[`Encodable`](/documentation/Swift/Encodable)

[`Decodable`](/documentation/Swift/Decodable)

[`ForceEffectProtocol`](/documentation/RealityKit/ForceEffectProtocol)

---

Copyright &copy; 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)