---
title: bounds
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/lowlevelmeshinstance/bounds
---

# bounds

The bounds of this mesh instance, in model space, or nil to derive bounds from the mesh part.

## Declaration

```swift
final var bounds: BoundingSphereBox? { get set }
```

## Discussion

Discussion Assign a value to override the mesh part’s bounds — for example, when using instancing to place instances across a wider area than the base mesh part covers, or when a geometry modifier displaces vertices beyond the mesh part’s recorded bounds.