| surfaceId | The ID of the surface that has changed. |
| changeType | The type of change this event represents (Added, Updated, Removed). |
| bounds | The bounds of the surface as reported by the device. |
| updateTime | The update time of the surface as reported by the device. |
The SurfaceChanged delegate handles SurfaceChanged events as generated by calling Update on a SurfaceObserver. Applications can use the bounds, changeType, and updateTime to selectively generate mesh data for the set of known surfaces.