Source SDK Documentation
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General
Creating, organizing, and releasing your project
Step-by-step guides on a variety of topics
In-depth discussion on the engine's features
Explanations for terms you may encounter
Art
Maps are the 3D worlds where everything comes together
Models are the detailed 3D objects that appear in the game world
Quality audio adds a fourth dimension to your world
Effects like smoke, blood, and fire are created with particles
Direct digital actors with choreographed scenes
Code and Logic
A mod's C++ code defines map and game rules
Adds new functionality or logic to entities
I/O system adds logic to your map
Controls complex NPC behaviors and actions
Other
Official tools made by Valve for their games
Useful developer tools created by the community
