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

# extent

The area around the anchor’s position that contains the texture.

## Declaration

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

## Discussion

Discussion Rendering reflective objects may involve projecting the environmentTexture onto a proxy geometry centered on the anchor’s position, then sampling from the projected texture. An environment probe anchor may have an infinite extent, which indicates that its texture is a global lighting environment, or a finite extent, which indicates that its texture represents the local lighting conditions in a specific area of the scene.