---
title: extent
framework: arkit
role: symbol
role_heading: Instance Property
path: arkit/arplaneanchor/extent
---

# extent

The estimated width and length of the detected plane.

## Declaration

```swift
var extent: simd_float3 { get }
```

## Discussion

Discussion warning: In iOS 16, use planeExtent instead. The framework sets the x and z components to the width and length of the plane, respectively. The y-component is unused, with a constant value of 0.

## See Also

### Dimensions

- [center](arkit/arplaneanchor/center.md)
- [planeExtent](arkit/arplaneanchor/planeextent.md)
- [ARPlaneExtent](arkit/arplaneextent.md)