---
title: VNGenerateOpticalFlowRequestRevision2
framework: vision
role: symbol
role_heading: Global Variable
path: vision/vngenerateopticalflowrequestrevision2
---

# VNGenerateOpticalFlowRequestRevision2

A constant for specifying revision 2 of the optical flow generation request.

## Declaration

```swift
var VNGenerateOpticalFlowRequestRevision2: Int { get }
```

## See Also

### Identifying Request Revisions

- [VNGenerateOpticalFlowRequestRevision1](vision/vngenerateopticalflowrequestrevision1.md)