Planes

This page is a supplement to the AR Foundation Plane detection manual. The following sections only contain information about APIs where Meta Quest exhibits unique platform-specific behavior.

Tip

When developing an AR app, refer to both the AR Foundation documentation as well as the required packages for each platform you support.

Space setup

To use planes on Meta Quest devices, the user must first complete Space Setup.

Unlike other AR platforms, Meta OpenXR does not dynamically discover planes at runtime. Instead, the Unity OpenXR: Meta queries the device's Space Setup data and returns all plane components that are stored in its Scene Model. Some entities in the Scene Model, such as Tables or Couches, include planes, while others do not.

Important

If Space Setup is not complete, AR Foundation cannot use plane data. If your app requires planes, you can use scene capture to prompt the user to complete Space Setup.

Trackable ID

Unlike other AR platforms, the trackableId property of any ARPlane from the Meta OpenXR platform persists across multiple sessions in the same space setup. This allows you to, for instance, save the trackableId of a user's table to persist a virtual centerpiece on the table each time the user runs your app.

Plane alignment

Also unique to the Meta OpenXR platform is the planeAlignmentThreshold property, which determines the threshold for PlaneAlignment categorization. Plane alignment is calculated by taking each component of the plane's normal vector and finding their difference from 0. If the difference is less than the planeAlignmentThreshold, then the MetaOpenXRPlaneSubsystem will categorize the plane depending on which of the normal vector's components are within the threshold. The x and z components are both checked for horizontal planes while the y component is checked for vertical planes.

Plane classifications

This package maps Meta's native semantic label component to AR Foundation's PlaneClassifications. Meta supports multiple classifications per plane.

Refer to the table below to understand the mapping between AR Foundation's classifications and Meta's semantic labels:

AR Foundation Label	Meta Label
Table	TABLE
Couch	COUCH
Floor	FLOOR
Ceiling	CEILING
WallFace	WALL_FACE
WallArt	WALL_ART
DoorFrame	DOOR_FRAME
WindowFrame	WINDOW_FRAME
InvisibleWallFace	INVISIBLE_WALL_FACE
Other	OTHER