---
title: removeExistingAnchors
framework: arkit
role: symbol
role_heading: Type Property
path: arkit/arsession/runoptions/removeexistinganchors
---

# removeExistingAnchors

An option to remove any anchor objects associated with the session’s previous run.

## Declaration

```swift
static var removeExistingAnchors: ARSession.RunOptions { get }
```

## Discussion

Discussion By default, when you call the run(_:options:) method on a session that has run before or is already running, the session keeps any ARAnchor objects that you previously added. That is, objects in the AR scene keep their apparent real-world positions relative to the device (unless you enable the resetTracking option). Enable the removeExistingAnchors option if changing session configurations should invalidate the apparent real-world positions of objects in the AR scene. For example, if you’ve added virtual content to the AR scene whose positions are correlated to real-world objects, remove those anchors so you can reevaluate appropriate real-world positions. On the other hand, if the virtual content in your scene needs to track real-world positions only when that content first appears and can move freely thereafter, you can disable this option to keep the anchors.

## See Also

### Run Options

- [resetTracking](arkit/arsession/runoptions/resettracking.md)
- [stopTrackedRaycasts](arkit/arsession/runoptions/stoptrackedraycasts.md)
- [resetSceneReconstruction](arkit/arsession/runoptions/resetscenereconstruction.md)