Portal 2 engine branch
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The 
Portal 2 engine branch was introduced with Portal 2 in 2011. It succeeded the 
Alien Swarm engine branch and was superseded by the 
CS:GO engine branch.
Features
New since the Alien Swarm engine branch is:
- Improved shadow mapping
- The entity env_projectedtexture is significantly improved. Compared to previous implementations, it has higher default resolution, better edge filtering and support for the caching of shadows from static objects.
- Sound operators
- For defining complex audio behaviour.
- Blob particles
- Used to render paint.
- Video playback on materials
- Added support to render Bink Video in-game on surfaces.
Availability
Source code for this branch is not available. However, authoring tools exist for custom content.
