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# ARPlaneAnchor.Alignment.horizontal

The plane is perpendicular to gravity.

```
case horizontal
```

## Discussion

The [`transform`](/documentation/ARKit/ARAnchor/transform) property for a horizontal plane anchor includes no rotation about the x- or z-axis. Thus, using this anchor’s transform to place a 3D model asset in your scene results in the model appearing “right side up”.

---

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