[jcranmer]

> Now I have a question: is it possible that things published before the date of the patent (24 march 2020) are infringing on the patent? Or, on the contrary, things published before this date can actually be prior art?

You have to look at the date of filing, not date of publication. The date of filing is June 12, 2018 (patents take a few years to issue these days). So March 9, 2019 cannot be prior art.

[nextaccountic]

This is very very concerning. Not only Amethyst's legion is archetype based, but also Bevy's ECS. So the Rust gamedev ecosystem is somewhat tainted (depending on the specifics on the patent and the source code of those frameworks, but I think that even reading the patent is risky - or at least I was told that, because if you know about the contents of the patent, infringing it is worse)

[jcelerier]

Isn't that the same principle that e.g. https://www.boost.org/doc/libs/master/doc/html/poly_collecti... which has existed since 2016 and described since 2014 (at least: https://bannalia.blogspot.com/2014/05/fast-polymorphic-colle... ) ?

[lamontcg]

If someone online talked about archetypes earlier than June 12, 2018 that can be prior art.

You don't need to have working code to take on a patent. If someone posted a medium article, or even some kind of proof of concept or cobbled together POC that'd be enough.

(I think really any kind of proof that you had the idea before that date is good enough -- a personal diary would work in principle, but you'd need to somehow prove that you wrote your thoughts down on the date and didn't forge it after the fact)

[AlbertCory]

> "a personal diary would work in principle, but you'd need to somehow prove that you wrote your thoughts down on the date and didn't forge it after the fact"

Patent agent here, not patent lawyer. (that means I passed the patent bar exam and could write your patent, but could not sue anyone over it.)

Wrong, wrong, wrong. Prior art has to be "published" (and there is a whole body of case law about what that means). Maybe you are thinking of the old "first to invent" rule?

[ska]

This is correct, although published is pretty broad it doesn't include everything under the sun.

The real problem is that the patent examiners are not in general required to look at the whole breadth of what is published, just what is in the patent databases.

As a result there can be clear prior art, but unless it gets fed in during the review process, the practical way to resolve that is likely to end up in court, and likely to be expensive.

Of course often "clear prior art" isn't too. Hence the process to sort it out.

[AlbertCory]

Interesting side note about non-patent prior art (by the way, the examiners do, most of the time, look for it):

I was told that a proposal to require the examiners to use Google was rejected by the union: if you're going to require us to do more work, then you have to pay us more.

This was back in 2012 or so. I have no idea if now they have to use Google, but they only get about a day and a half on each patent (again, this is old data).

[ska]

> (by the way, the examiners do, most of the time, look for it)

Sure, but usually superficially (and not, I think, required); which is fair - you can't practically require the patent examiners to have the kind of breadth and depth necessary to have a good feel for this.

[AlbertCory]

One more point about this: the date on the publication isn't necessary the effective date. If it's a journal that says "May 1999" that doesn't mean the date is May 1. It would be the date that it became available to persons in the art.

Getting a librarian to say "yes, we cataloged it and made it available on May 5" would be pretty strong. Or a Wayback Machine archive from May 2.

[lamontcg]

Ah okay didn't know that.

Still I think I've been deposed (I got grilled by an actual hostile patent lawyer) before over an old Usenet post I made in the late-90s (that was really more of a "showerthought" in the middle of an flamewar) that was being used to attack a patent.

[nightpool]

Yes, the rules changed in 2011, as part of the America Invents Act. https://en.wikipedia.org/wiki/First_to_file_and_first_to_inv...

[k__]

Aren't ECS systems much older?

I remember reading about them in my CS studies, and that was pre 2011.

[tinco]

It's specifically archetype based ECS that's been patented. Like (seemingly) everyone else in gamedev, I've implemented ECS multiple times over the past 10 years. The last time I did it was in Rust, trying to be the first to use Rust's awesome parallel processing constructs to make an automatically parallel ECS, I got distracted halfway through and then specs beat me to it.

I'd never seen or heard of archetype based ECS before I first saw Legion and I was very impressed with it. I don't know where they got the idea but it's very worrying if Unity legit came up with this first. I'm not super up to date on what's happening inside AAA studios, but what I've seen in production is that game studios usually manually group components to optimise performance. The automatic grouping in archetypes is definitely not mentioned in any tutorial or game engine architecture I've ever seen before Legion.

Edit: creator of bevy has a great initial reaction to this on Reddit: https://www.reddit.com/r/rust/comments/pjtpkj/comment/hbzaz6...

[letsInvalid]

Ok, 2019 is out

How about 2013:

https://www.gamedev.net/tutorials/programming/general-and-ga...

I use a heavily updated version of this for my own projects

[dkersten]

Ignoring the specific claims in the patent (automatic memory optimization or whatever), if we're just going by entity component system articles, we can do a lot better. Here's one from 2007:

http://t-machine.org/index.php/2007/09/03/entity-systems-are...

IIRC this one was the one to really popularise the idea of not storing any component data in the entities. If you loosen that requirement, there were earlier ones still (eg the one from the Dungeon Siege team).

But as others have mentioned, ECS is really a special case of a relational model, so its entirely possible that Unitity's techniques have been done there already.

Also, I found it pretty difficult to understand the claims, they didn't exactly make it easy to read, so I can't quite figure out exactly what is patented. It also doesn't help that they don't clearly define their terms, eg what exactly do they mean by archetype? Maybe they describe it in the description before the claims, but I didn't find it at a cursory glance and it was too painful to try read it all. I wonder what their definition exactly entails, versus what I imagine they mean from what I know of archetype-based ECS's. For example, if they mean "a conceptual grouping of entities that have the same components" then non-archetype ECS could fit that, but if they mean their specific implementation then I don't know. EnTT, a popular non-archetype-based ECS, has had "views", which are ways to efficiently access components, since its first public commit in 2017: https://github.com/skypjack/entt/commit/b0b8ee7aea3d9f5cfe6f...).

Whether any of that is relevant to the patents validity, I have no idea. Probably not.

[shock-value]

It's not relevant. Unity is claiming an automated system for determining an optimal memory layout as entities with new combinations of components are generated (at runtime). Such a layout defined in advance would not infringe.

[jhgb]

> Unity is claiming an automated system for determining an optimal memory layout as entities with new combinations of components are generated

So they've patented a database server, basically.

[jeffparsons]

I was wondering when this would come up. Everything people are inventing in the "ECS" space, including the very concept of "ECS" itself is just concepts from databases being adapted to storing small amounts of ephemeral data that needs to be manipulated very quickly in-memory rather than large amounts of data that need to be persisted reliably on disk.

The idea that there's anything patent-worthy in automatically storing like combinations of data with like combinations of data for efficiency is... patently absurd.

But that's where the patent system is, now, I suppose. It's now mostly just a tool to help incumbents raise the barrier to entry so they can fend new entrants off with lawyers rather than merit.

[BirdPlusPlus]

Well said. Incumbents "Industrial Incumbents"

You didn't patent that did you?

[shock-value]

Can you name a database that performs such a function? There might very well be one, but I'm not aware.

I'm most familiar with relational databases and the way in which their data is stored is generally dictated by the schema.

At a minimum, to be consistent with this patent we'd be talking about a database that accepts arbitrary groupings of predefined sets of fields, which then on-the-fly determines how best to pack these individual sets together with other sets belonging to other groupings. The fact that we are talking about two types of collections (one nested in the other) is key -- that is, the nesting of fields within the sets ("components" in ECS terminology), and the nesting of these sets within the groupings ("entities" in ECS terminology).

[jhgb]

> I'm most familiar with relational databases and the way in which their data is stored is generally dictated by the schema.

One of the major features of relational databases (and the improvement over their predecessors) was precisely the disconnect between logical and physical model. If the logical schema dictates how something is stored physically, then it's not a terribly good system. At the very least the intention with relational databases was to provide for this extra flexibility that previous models didn't have. Sure you don't have to exercise that flexibility but it's always been there.

> we'd be talking about a database that accepts arbitrary groupings of predefined sets of fields, which then on-the-fly determines how best to pack these individual sets together with other sets belonging to other groupings

So basically columnar storage with table inheritance would be enough to do the trick. I know there's databases for either of those features, and it's absolutely not a huge leap to put the two together. Fact is I wanted to implement something like this for CLOS but didn't have the time yet, sadly.

[letsInvalid]

That’s not exactly novel either.

I’ve seen engines that do that and updated my own code to do so. Unfortunately git says that was added after they filed.

Their employees could have easily pulled this from community discourse.

What’s probably needed is community backlash; no more unity games. It worked with Apple.

[adampk]

https://www.youtube.com/watch?v=W3aieHjyNvw&t=1455s

"In this 2017 GDC session, Blizzard's Timothy Ford explains how Overwatch uses the Entity Component System (ECS) architecture to create a rich variety of layered gameplay."

(My favorite resource to explain ECS + NetCode)