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# extent

The estimated width and length of the detected plane.

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

## Discussion

> Warning:
> In iOS 16, use ``doc://com.apple.arkit/documentation/ARKit/ARPlaneAnchor/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`.

---

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