Source SDK Documentation Index
Maps are the cornerstone of Source, where it all comes together. Learn about all aspects of producing them here.
Make Source's characters come to life with its uniquely powerful choreography technologies.
AI stands for Artificial Intelligence (Wikipedia) and controls the behaviour of all but the simplest of NPC actions. Source's AI is not to be confused with Half-Life 2's restrained implementation of it: it is very powerful and very clever. This category will provide an overview of how to implement and manage AI in your Source game or map.
Source's material proxy exponentially increases flexibility and allows for multiple materials from just one texture.
Documentation on Source's software sound system.
Everything you need to know about modelling for Source.
The nuts and bolts of any MOD, programming is what makes things different.