<!--
{
  "availability" : [
    "iOS: 26.0.0 -",
    "iPadOS: 26.0.0 -",
    "macCatalyst: 26.0.0 -",
    "macOS: 26.0.0 -",
    "tvOS: 26.0.0 -",
    "visionOS: 26.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "RealityKit",
  "identifier" : "/documentation/RealityKit/MeshInstancesComponent/Part",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "RealityKit"
    ],
    "preciseIdentifier" : "s:17RealityFoundation22MeshInstancesComponentV4PartV"
  },
  "title" : "MeshInstancesComponent.Part"
}
-->

# MeshInstancesComponent.Part

A group of instances to render.

```
struct Part
```

## Topics

### Initializers

[`init(data: LowLevelInstanceData, bounds: BoundingBox?)`](/documentation/RealityKit/MeshInstancesComponent/Part/init(data:bounds:))

### Instance Properties

[`var bounds: BoundingBox?`](/documentation/RealityKit/MeshInstancesComponent/Part/bounds)

The bounding box to encompass all of the instances this group part draws.

[`var data: LowLevelInstanceData`](/documentation/RealityKit/MeshInstancesComponent/Part/data)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)