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[[File:Strata_Logo.png|thumb|right|The official logo for Strata Source.]]

{{strata|4}} (formerly known as Chaos Source) is a third-party {{Src|3.1}} engine modification that utilizes both proprietary and open-source licensed code. It is a modified version of the {{csgobranch|3.1}} that combines many of the features present in both {{csgo|3.1}} and {{p2|3.1}}, along with making various improvements to the engine that bring Source close to modern standards.

As of late, the engine is still undergoing active, closed-source development and is yet to have been released to the public.

== History ==
Development on Strata Source commenced in Late 2020 as a community made fork of the {{csgobranch|4}} with features from {{p2|4}} backported. Initially known as 'Chaos Source', the project was the result of a joint collaboration between the mod teams responsible for the {{Momentum|4}} and {{P2ce|4}} modifications respectively. The team, known at the time as 'Chaos Studios', envisioned a version of the Source Engine that fostered an 'open and sharing community' with respect to all Source Engine licensees.

As of 2023, in an effort to improve the branding of the engine branch, the team behind Chaos Source renamed the engine to what is now known as 'Strata Source', per the input and feedback of the project's members.

== Features ==
[[File:Portal_Revolution_-_Screenshot_4.jpg|thumb|right|A screenshot of {{portalrev|3.1}} showcasing Strata Source's improved shading.]]
{{For|more information|the [https://wiki.stratasource.org Strata Source Wiki]}}
Since the inception of the Strata Source project, many features and fixes (among other improvements) have been implemented into the Strata Source engine. Some of the additions include:
; A native {{wiki|DirectX 11}} renderer
; DXVK support on Linux for DirectX 11
; 64-bit support
: 32-bit support has been completely dropped.
; [[Physically Based Rendering|PBR]] shading
: Uses shaders to attempt to more accurately simulate real-world light.
; Backported {{p2branch|4}} features
: Including, but not limited to: [[linked_portal_door|world portals]], [[Gel (Portal 2)|gels]] and the [[weapon_portalgun|portal gun]].
; Backwards compatibility with BSP v19-21
; Backwards compatibility with TF2/HL2 branch models
; [[WEBM]] video support, replacing older [[Bik|bink videos]]
: Increased framerate, lower file sizes, and easier to author
; Steam audio support
; Many improvements to {{wiki|Linux}} support
; Many improvements to the {{hammer|4|nt=0}}
; Many code quality improvements (Refactors, cleanup and C++20)
; Cross-platform engine utilities and tools
; [https://sentry.io/welcome/ Sentry] crash report integration

== Availability ==
Strata Source has yet to be wholly released to the general public. Some of it's [https://github.com/StrataSource constituent project's] source code are available for access on GitHub however.

In addition, the following projects will use the Strata Source engine branch:
* {{P2ce|4}}
* {{Momentum|4}}
* {{portalrev|4}}

== See Also ==
* [https://stratasource.org Strata Source's Official Website]
* [https://stratasource.github.io/Wiki/ Strata Source's Wiki]
* {{Mapbase|4}}

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{{branch-navbox}} [[Category:Third-Party Engine Branches]] [[Category:Strata Source]]
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