Developer commentary
Added full developer commentary from most members of the team, featuring over 200 nodes.

Engine
Volumetric lighting
Updated volumetric lighting effects to require less samples, which improves performance while also looking better. We could measure speedup of up to ~46%. The new implementation also allows you to select different quality options and their look has been improved to work from more view angles
Other
- sv_max_allowed_developer is now set to 2 by default so developer cvar can now be changed during gameplay
- Fixed mat_fullbright now properly working with static props and overlays
- Various crash fixes (Thanks Strata!)
Map changes
We updated a lot of maps. Besides the usual bug fixes detailed below, here are some of the highlights This corner of sp_a3_vactube_flings has been opened up. Players would often not find the cube dropper since it was hidden away, so we hope this change fixes that.





Low quality graphics settings
We improved support for low graphics settings. Some materials, like water, appeared broken which are now fixed. Some materials would also fail to respect lower graphics settings and render at full quality. Some commonly used models will now render at lower fidelity when low graphics settings are enabled.Model fixes
- Fixed visual artifacts on reflector cube
- Fixed desk lamp body glowing in the dark
UI
- Added quality options for volumetric lighting
- Added test chamber number to map selection dropdown
- Added option to set the main-menu background map to any chapter
- Audio device list can now show more than 8 devices
- Changed “Mute Audio When Minimized” to be a slider “Reduce Volume When Minimized”
- Fixed odd-even row coloring in video tab
- Fixed plush DLC button taking focus when you already have the DLC installed
- Removed option to disable HDR Tonemapping
All map changes
sp_a1_begin- Updated lighting
- Fixed some visible nodraw
- Updated lighting
- Fixed misaligned textures
- Fixed softlocks
- Moved the copy machine towards the desk
- End transition now starts after hitting the floor to make it seem less like you died
- Updated cubemaps
- Fixed breakable cubes transforming into plush cubes when putting them into the laser
- Added cable to connect disk reader with the door
- Updated lighting in test chamber
- Added new overlay to the wall at the beginning
- Updated aperture overlay in elevator room to higher resolution version
- Fixed some z-fighting in the beginning
- Fixed the water on low settings
- Updated water material in the bottom of the cavern to be less expensive
- Fix water on low graphics settings
- Made pit deeper
- Added collision to pressure spheres
- Updated lighting
- Fixed softlocks and bugs
- Fixed several self-trapping spots
- Grates now make grate footstep sounds more consistently
- Updated slope angle on shore
- Extended the puzzle
- Player now spawns facing towards the vactube ride
- Fixed vactube not casting shadows
- Updated geometry up above
- Updated geometry around cube dropper in an attempt that players will no longer miss it
- Updated cubemaps
- Fixed chairs falling over on spawn
- Updated gameplay in control room 3