---
title: "init(partIndex:treePartOffset:treeAxisOffset:)"
framework: hvf
role: symbol
role_heading: Initializer
platforms: [iOS 18.4+, iPadOS 18.4+, Mac Catalyst 18.4+, macOS 15.4+, tvOS 18.4+, visionOS 2.4+, watchOS 11.4+]
path: "hvf/compositesubpart/init(partindex:treepartoffset:treeaxisoffset:)"
---

# init(partIndex:treePartOffset:treeAxisOffset:)

## Declaration

```swift
init(partIndex: UInt32, treePartOffset: UInt16, treeAxisOffset: UInt16)
```