---
title: isPatchData
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlvertexattribute/ispatchdata
---

# isPatchData

A Boolean value that indicates whether this vertex attribute represents patch data.

## Declaration

```swift
var isPatchData: Bool { get }
```

## Discussion

Discussion This value is always false if the vertex function is not a post-tessellation vertex function.

## See Also

### Describing the attribute

- [name](metal/mtlvertexattribute/name.md)
- [attributeIndex](metal/mtlvertexattribute/attributeindex.md)
- [attributeType](metal/mtlvertexattribute/attributetype.md)
- [isActive](metal/mtlvertexattribute/isactive.md)
- [isPatchControlPointData](metal/mtlvertexattribute/ispatchcontrolpointdata.md)