---
title: trajectoryLength
framework: vision
role: symbol
role_heading: Instance Property
path: vision/detecttrajectoriesrequest/trajectorylength
---

# trajectoryLength

The number of points to detect before calculating a trajectory.

## Declaration

```swift
final let trajectoryLength: Int
```

## See Also

### Configuring a request

- [objectMaximumNormalizedRadius](vision/detecttrajectoriesrequest/objectmaximumnormalizedradius.md)
- [objectMinimumNormalizedRadius](vision/detecttrajectoriesrequest/objectminimumnormalizedradius.md)
- [targetFrameTime](vision/detecttrajectoriesrequest/targetframetime.md)