Void

The Void is the black place outside of maps. it is an infinitely large area of nothingness that surrounds every map.

The map can occasionally share it's inside space with the void. this is known as a leak. loading the map's compiled pointfile plots a course between this void and the closest entity in the map. When there is a leak, the Void acts strangely, turning all outside faces of the map black.

The Void is not physical. it isn't a brush, entity or hard-coded into source. it is the lack of code, entities and brushes.

When viewing the Void from inside the map, it picks colours from the screen pixels nearby. Much like in computers, clicking and dragging something makes it repeat several times without physically being there. With the Void, moving your view can make textures repeat several times on the Void. It also makes the view glow, to the point where a solid colour overwrites the whole page. Usually, it keeps on doing so, until the Void visible is completely white.

The Void is present in both the Goldsource and Source engines. It's appearence in other game engines is not entirely impossible though.