| origin | The origin of the requested observation volume. |
| extents | The extents in meters of the requested observation volume. |
This method sets the observation volume as an axis aligned box at the requested location. Successive calls can be used to reshape the observation volume and/or to move it in the scene as needed. Extents are the distance from the center of the box to its edges along each axis.
Very large observation volumes will increase overhead of calling SurfaceObserver.Update as the number of observable Surfaces grows.