---
title: dataStart
framework: modelio
role: symbol
role_heading: Instance Property
path: modelio/mdlvertexattributedata/datastart
---

# dataStart

The offset, in bytes, from the start of the data to where vertex attribute information begins.

## Declaration

```swift
var dataStart: UnsafeMutableRawPointer { get set }
```

## See Also

### Accessing Data for a Vertex Attribute

- [stride](modelio/mdlvertexattributedata/stride.md)
- [format](modelio/mdlvertexattributedata/format.md)