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Portal 2: CE
The best way to Play and Create Portal community content.
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Momentum Mod
Source movement speedrunning at its finest.
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Portal: Revolution
All-encompassing story campaign mod for Portal 2.
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WHAT IS STRATA SOURCE?

Strata Source began as the Source Engine branch behind Portal 2: Community
Edition (P2:CE) in 2020. In late 2020, Momentum Mod joined forces with the P2:CE
team with the goal of collaborating on this new branch. The aim of Strata is to
foster collaboration between licensed projects. Today, a team of almost two
dozen developers contribute to Strata Source, with three licensed projects using
the engine.


HOW CAN I USE STRATA?

Strata is only accessible as part of the licensed games built using it; we do
not provide any publicly available SDK. Any licensed Source engine project is
welcome to contact us regarding collaboration.

If you’re interested in making a Portal 2 mod on Strata, check out P2:CE or
Portal: Revolution.


CAN STRATA HELP MY PROJECT GET LICENSED?

No. Licensing is done entirely by Valve. We cannot license projects and don’t
provide any source code to unlicensed projects. We cannot influence Valve’s
licensing decisions and don’t offer legal advice. See Valve’s documentation on
Source engine licensing: Distributing Source Engine Games / Mods.


CAN I USE STRATA’S LOGO OR BRANDING?

Please don’t use our logo or branding to represent your project.

You are welcome to use our logo and branding in material about Strata itself,
such as videos or articles. See our branding page: Strata Branding.


WHY NOT SOURCE 2?

We do not have access to Source 2 and are not licensed to use Source 2. All of
the games currently using Strata are closely tied to existing Source 1 content,
so Source 2 would be a poor choice for us.

We do have some Source 2 features, such as the Panorama UI system, that were
backported by Valve to CS:GO. However, Strata is still almost entirely Source 1.
Whilst Source 1 does contain considerable tech-debt, we’ve been able to improve
and modernize it considerably, and we think its long-term maintenance is a
worthwhile endeavor.


WHERE DOES YOUR NAME COME FROM?

The name Strata comes from geology, referring to the rocky layers of a planet's
crust. The Source Engine is a huge codebase containing decades worth of code,
from contemporary titles such as CS:GO and Portal 2, going all the way back to
the days of Quake.

Our work is frequently a process of delving deep into the many layers of the
engine and modernizing, refactoring, refining and demolishing various sections.
So, we felt the analogy to geology and mining was apt!


WASN'T YOUR PREVIOUS NAME “CHAOS”?

Yep! When the project started in 2020 it was under the name “Chaos Source” with
contributors organized under the umbrella of “Chaos Initiative” and the P2:CE
team known as “Chaos Studios”. This naming was chosen in very early days of the
project, and while it was okay for a time, in 2023 we decided to optimize our
branding with input from a wider range of project members and decided on Strata
Source.

©2024 Strata Source
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