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|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.