A trackable is feature in the physical environment that a device is able to track, such as a plane.
TrackableType may be used as a flag and passed to methods like XRRaycastSubsystem.Raycast to specify different
types of trackables to raycast against.
| None | No trackable. |
| PlaneWithinPolygon | The boundary of a BoundedPlane |
| PlaneWithinBounds | Within the BoundedPlane.Size of a BoundedPlane |
| PlaneWithinInfinity | The infinite plane of a BoundedPlane |
| PlaneEstimated | An estimated plane. |
| Planes | Any of the plane types. |
| FeaturePoint | A feature point. |
| All | All trackables (planes and point cloud) |