The lastest documentation for Plane Detection can be found in the documentation
- Unity: Plane Detection Sample | Snapdragon Spaces (qualcomm.com)
- Unreal: Plane Detection Sample | Snapdragon Spaces (qualcomm.com)
When using plane detection there are two modes available default and Scene Understanding (spatial meshing-based plane detection).
| Default | Scene Understanding | |
| Detection speed and first detection | Normal | Fast |
| False Positives | Few false positives | Prone to false positives |
| Plane accuracy | High | High |
| Number of planes | Few | Many |
| Plane updates and movement | Stable with unlikely updates | Dynamic with more plane updates |
| Plane orientation filter | Filter options for horizontal and vertical | No filter options |
| Hit Testing | As expected against plane | Hit test against mesh |
Unity
- The option is available under Project Settings > XR Plug-in Management > OpenXR > Plane Detection.
Known issues with Scene Understanding
- When using ARRaycast to test for a hit against an ARPlane generated by Scene Understanding the ray will be cast against the spatial mesh instead. The id of the ARRaycastHit result is the id of the mesh, not of the ARTrackable plane.
- Setting the detection mode in the AR Plane Manager is not possible at this moment. Every plane orientation will be tracked regardless of the chosen option.
Unreal
- Disabling Plane Detection in Unreal while Spatial Meshing is enabled will enable Scene Understanding in your map.
- The option is available at Project Settings > Plugins > Snapdragon Spaces > Extensions
| Scene Understanding active | Default Plane Detection active |
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Known issues with Scene Understanding
- Filtering for horizontal or vertical planes only is not possible when using Scene Understanding.
