View source for Aura

{{stub}}
{{Aura|4.1}} is a codebase framework for Multiplayer games on the {{gldsrc|1}} engine, created by The Phoenix Project Software. It is the successor to [[Grey Source]] and debuted in 2021 with the release of {{Cross Product|1}} Multiplayer version 2.4.

It is a heavily modified fork of {{ag|1}} and uses [https://github.com/yalter/openag OpenAG] for the clientside library.

==Features & technologies==
Though it has a lot of inherited features from Adrenaline Gamer, Aura introduces many features of its own to make the games using it unique.

===Shield system===
For ''Cross Product Multiplayer,'' {{hl|1}}'s damage system was overhauled and replaced with regenerating HEV suit armor, known as shield regeneration.

===Expanded gametypes===
Expanding upon the features from AG, Aura adds a "HLDM" and "SWAT" gametype.

===Music Playback System===
Aura uses GoldSrc's built-in MP3 playback system and adapts it for multiplayer in certain gametypes.

===Expanded weapons===
With more to come, Aura backports the weapons from {{hlop4|1}}.

===Source SDK & Steamworks integration===
Aura's clientside binary leverages an adapted version of the {{src13|1}} libraries - [[VGUI2]], [[Tier1]], and [[Tier2]]. It also uses the [[Steamworks]] API. This allows for the following features:
* [[Steam Workshop]]
* New Server Browser
* Smooth viewbobbing
* [[Steam Input]] features (lightbar, vibration)
* Steam Achievements
* Steam Stats

==Aura SDK==
To benefit creators and authors, particularly for the Steam Workshop, The Phoenix Project Software released the '''Aura SDK''' on Steam in 2025. It is a comprehensive set of tools, source files, and resources, aimed to help enable the creation of custom content.

It also comes with a set of Tools to help authors get started quickly, some created by TPPS, and some which are forks of other community-made tools as per their license:
* [[Harbinger]] - Steam Workshop publishing tool for ''Cross Product Multiplayer''
* [[Helix]] - a fork of {{hlam|1}}
* [[Sapien]] - a fork of [[newbspguy]]
* [[Spectra]] - used for converting images to TGA for VGUI panels
* Tessera - a fork of {{hltex|1}}

The Phoenix Project Software has plans to expand the forks with features of their own to compliment ''Cross Product Multiplayer,'' but for now has distributed them per their licenses for convenience.

==External links==
[https://github.com/phoenixprojectsoftware/Aura Aura source code]