Occlusion Portals

In order to create occlusion primitives which are openable and closable at runtime, Unity uses Occlusion Portals.

*Property:*	*Function:*
Open	Indicates if the portal is open (scriptable).
Center	Sets the center of the Occlusion AreaA component which defines a 3D space within which to apply Occlusion Culling to moving objects. More info See in Glossary. By default this is 0,0,0 and is located in the center of the box.
Size	Defines the size of the Occlusion Area.

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Unity Manual