---
title: "formUnion(_:)"
framework: realitykit
role: symbol
role_heading: Instance Method
path: "realitykit/boundingbox/formunion(_:)"
---

# formUnion(_:)

Expands the bounding box to contain the specified bounds.

## Declaration

```swift
mutating func formUnion(_ other: BoundingBox)
```

## Parameters

- `other`: Another bounding box.