Dota 2 engine branch (Source)
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The 
Dota 2 engine branch (Pre-Reborn) was introduced in 2013 with the release of Dota 2. It used to be the latest 
Source branch available, succeeding the 
Counter-Strike: Global Offensive engine branch, but in the 2015 Reborn update, the game was upgraded to the then-new 
Source 2 engine, which makes CS:GO the latest Source 1 branch available. Additionally, this is the only Source 1 engine branch that was never licensed to third-party developers.
Features [confirm]
New since the CS:GO engine branch is:
- Cloth simulation
- Real-time cloth simulation (i.e. soft-body physics).
- Global lighting
- The world is lit and shadowed dynamically with
env_global_light(in addition to pre-compiled light). - Steamworks integration
- Building upon community-driven features from Team Fortress 2 players will be able to share strategy guides and coach newer players through Steamworks.
- MultiBlend Textures
- 4-way texture blending, upgrading/replacing WorldVertexTransition
- Screen-space Anti-aliasing
- Anti-aliasing for use with deferred shading
- Screen Space Ambient Occlusion
- Ssao post-process shader
- Published demo file format
- Dota 2 Demo Format contains a link and instructions for parsing the Dota 2 demo files
- Custom Addon Support
- See the Dota 2 Workshop Tools for more details.
