The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven, shader-based renderer, accurate lip sync and facial expression technology, and a powerful, efficient and completely network-enabled physics system.

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A video tutorial explaining the application and method of creating a 3D skybox for your Source map.

Posted by hiyougami on May 10th, 2012
Intermediate Mapping/Technical.

Mappers, visit these links please!
3D Skybox on the Valve Developer Community
3kliksphilip's Fog tutorial

The 3D Skybox is used to give the illusion of a map being larger than it is. They take a tiny area outside the map full of scenery and scale it up sixteen times, then project it around the map - but to know where to put this scaled-up scenery, they need to know where the origin point (0,0,0) of the map is, so we add a sky_camera as a reference point for the origin.
TIP: You can find brilliant one-sixteenth-scale scenery models by creating a prop_static, opening the model browser from the World Model parameter and searching for "skybox".

(Source Sky Texture List)

Like the map in my desktop wallpaper? You can download it here.

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Released Oct 2004
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