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Unity owned ECS patent uses techniques described in 2013 Stack Exchange post
github.comThe 2013 StackExchange post [^1] describes what is now commonly called an "archetype" based ECS architecture that was implemented as compile time archetypes in the author's open source project in Feb 2018 ^3. A similar ECS model was described later in the June 2018 patent filed by Unity ^2 and active since 2020.
It's useful to bring visibility to the issue for the inevitable patent trolling that will occur in the future.
References: [^1]: https://gamedev.stackexchange.com/questions/58693/grouping-entities-of-the-same-component-set-into-linear-memory/
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