<!--
{
  "availability" : [
    "iOS: 27.0.0 -",
    "iPadOS: 27.0.0 -",
    "tvOS: 27.0.0 -",
    "visionOS: 27.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "RealityKit",
  "identifier" : "/documentation/RealityKit/LowLevelMeshResource/Attribute/format",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "RealityKit"
    ],
    "preciseIdentifier" : "s:19RealityCoreRenderer20LowLevelMeshResourceC9AttributeV6formatSo15MTLVertexFormatVvp"
  },
  "title" : "format"
}
-->

# format

The format of the vertex attribute.

```
var format: MTLVertexFormat { get set }
```

## Discussion

When reading from a geometry modifier or surface shader, the value converts to its
runtime representation using Metal’s standard rules. See
`MTLVertexAttributeDescriptor.format` for details.

---

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)