---
title: VNGenerateOpticalFlowRequestRevision1
framework: vision
role: symbol
role_heading: Global Variable
path: vision/vngenerateopticalflowrequestrevision1
---

# VNGenerateOpticalFlowRequestRevision1

A constant for specifying revision 1 of the optical flow generation request.

## Declaration

```swift
var VNGenerateOpticalFlowRequestRevision1: Int { get }
```

## See Also

### Identifying Request Revisions

- [VNGenerateOpticalFlowRequestRevision2](vision/vngenerateopticalflowrequestrevision2.md)