Observation Room

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The rooms are also used as a light source, not only for decoration.

Observation Rooms are rooms high on the walls in the test chambers of Aperture's testing tracks. They were orignally where Aperture Employees watched test sbjects during their Tesing sequences but have since been abandoned. They are characterized by bright white and concrete wall textures and frosted glass windows. They are also the main source of light in most test chambers and range in size from 128x64 to 128x256. There are several textures available in Hammer for Portal or Portal 2 to create your own and they can be made easily with a instance. In Portal 2, you can find the observation rooms in the instances/labs/ folder.

For more information on making instances, go to func_instance.