---
title: positions
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/forceeffectparameters/positions
---

# positions

The positions of all rigid bodies under the influence of the effect, or nil if positional information was not requested.

## Declaration

```swift
let positions: UnsafeForceEffectBuffer<SIMD3<Float>>?
```

## Discussion

Discussion The position is located at each body’s center of mass, relative to the origin of the effect.