Portal 2 engine branch

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The Portal 2 engine branch Portal 2 engine branch was introduced with Portal 2 Portal 2 in 2011. It succeeded the Alien Swarm engine branch Alien Swarm engine branch and was superseded by the CS:GO engine branch CS:GO engine branch.


New since the Alien Swarm engine branch 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.
Video playback on materials
Added support to render Bink Video in-game on surfaces.
Blob particles
A particle renderer that renders blobs of liquid, used for paint gel in Portal 2.
World portals
World portals that can seamlessly link together seperate parts of the world. This feature is exclusive to this engine branch.
Sound operators
For defining complex audio behaviour.
Finished water debris flow
The base texture water flow feature from the Alien Swarm engine branch has been finished, with flowed normals now distorting color lookup and the flow map's alpha channel controlling color map opacity.
Better PlayStation 3 PS3 Support
Of little use to modders, needless to say! Properly optimized by Valve unlike the PS3 port of The Orange Box The Orange Box which was done by EA and suffered from occasional frame drops.


A third-party, heavily modified version of this engine used for Titanfall & other games by Respawn Entertainment, called the Tf-16px.png Titanfall engine branch, is also available, and it is used on the following games:

Source code for both branches is not available. However, authoring tools exist for custom content.