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.
Valve have released a beta update to the Source SDK, including:
- Half-Life 2: Episode Two game source code.
- Removal of the need to use command-line parameters to access the Episode One-era tools or the new studiomdl and vmex.
- Hammer 3D Lighting Preview (including 3D ray-traced).
- scenes.image compiler for choreography creators.
- Various bug fixes.