@PimDeWitte I think that's right. The combination of graphics and physics engines with a World Model's learned behavioral dynamics is where true, complex, and unpredictable simulation can be unlocked.
English
Matthew Bromberg
447 posts
Adding a few things that didn't make the final cut as well: Game and physics engines remain hugely important - they offer determinism, are designed for entertainment, and are optimized for delivering on mass consumer hardware. World Models are probabilistic and currently designed for generating unique training environments. They serve different use cases and customers. Determinism is especially important in competitive games where you must guarantee the rules and operations for all players are equal and repeatable, or when training models, and you want to check for exact values, such as distances for driving safety, or whether a protein structure satisfies geometric and physical constraints under differentiable metrics. It's a much better question to ask "What new entertainment might be downstream from World Models?", instead of assuming they will replace engines. I think it's unlikely, especially with the advances on coding and general agents benefiting engines directly. The sweet spot is the combination of a traditional, deterministic physics engine (like a game engine) with an agent, to unlock the full stochastic state space that are possible within the defined physics space. Intelligence is unlocked on the exchange of information between the action and the environment. When you can't guarantee environment consistency, like today in World Models, you need derterminism at scale, at the lowest possible compute cost - i.e. optimized game or physics engines.
English
Packy and I spent the past month unpacking world models from first principles. This piece is the result of that exploration. We go into why, what, how, and look out into the future on the implications of our work.
Packy McCormick@packyM
There is a tremendous amount of progress happening in World Models. Multiple labs have raised more than $1B. WMs were the star of GTC. They are a real path to embodied AI. So @PimDeWitte & I wrote a comprehensive 19k word overview of World Models. notboring.co/p/world-models
English
Looking forward to seeing everyone next week. Our team has delivered real value for the Unity community.
Unity for Games@unitygames
Get a sneak peek at the upcoming Unity Engine and tech updates designed to help you build and scale your games 🛠️
English
I am so thrilled to announce that @gamerbk is joining our Board!
Bernard brings more than 20 years of leadership experience across public companies and global consumer platforms. He has served as CEO and a member of the board of directors of Match Group and President of Publishing at leading mobile game publisher Zynga. Earlier in his career, he spent nearly a decade at Electronic Arts, including as Senior Vice President of Mobile Publishing. His experience in gaming and technology and a deep knowledge of our customers will bring tremendous value. At the same time, I want to thank David Helgason and Tomer Bar-Zeev, who have stepped down from the Board. David and Tomer have been vital partners as we’ve grown and transformed Unity. They welcomed me into the Company, shared their unique vision as founders, and have provided unfailing support. I’m looking forward to many more years of conversation with both of them.
Full release here: investors.unity.com/news/news-deta…
English
This is very thoughtful and well informed.
Jacob Navok@JNavok
Thread on Genie 3 and mistaken investor expectations among game publishers and tool makers. I'm a big believer in AI and its ability to change the game industry. I'm also a big believer in prompt base games. You can see my predictions on this from several months ago: x.com/JNavok/status/…
English
@_k_sridhar Very much agree on central role engines can play in training.
English
@maxbatt @ManuVision I would think about it like a prototyping - get a vibe for the world and the kind of interactivity and see how it feels.
English
@MBromberg @ManuVision I think you misunderstood me. I’m not asking if it’s possible. I’m asking why a user would want that. IMO It really falls apart when you start to think about the integration details.
English
Folks. Can I explain something about world models? Seems like today might be a good day for that.
Advances in large-scale “world models” — whether developed by partners like Google or others — materially expand the frontier of interactive content creation. These models can generate high-quality, interactive, video-like experiences from natural language or minimal input.
Today, they are primarily editable through prompting, which limits the level of determinism and precision required for production-grade game mechanics. As a result, their outputs remain probabilistic and non-deterministic, making them unsuitable on their own for games that require consistent, repeatable player experiences.
Rather than viewing this as a risk, we see it as a powerful accelerator. Video-based generation is exactly the type of input our Agentic AI workflows are designed to leverage—translating rich visual output into initial game scenes that can then be refined with the deterministic systems Unity developers use today. Our agents already generate high-quality scenes from static video. Interactive, camera-controllable video from world models would further enhance this pipeline and materially improve the fidelity and speed of early-stage content creation. We believe this represents a meaningful step forward for AI-driven development across the industry.
Unity’s role is to operationalize these advances. Outputs from world models are ingested into Unity’s real-time engine, where they are converted into structured, deterministic, and fully controllable simulations. Within Unity, creators define physics, gameplay logic, networking, monetization, and live-operations systems to ensure consistent behavior across devices and sessions.
This combination enables developers to move faster from concept to scalable product: AI accelerates environment and asset generation, while Unity provides the execution layer that transforms generated content into reliable, monetizable experiences.
As a result, world models expand content supply and reduce development friction, while Unity remains the system of record for runtime, distribution, and long-term operations. This dynamic broadens Unity’s addressable market and reinforces its central role in the interactive ecosystem.
English
@maxbatt @ManuVision Max, we are building agentic AI as the compiler layer that would then allow game makers to convert the "simulation" generated by Genie into the real game world which you could then build on.
English
@MBromberg @ManuVision What? This sounds so confusing. I’m saying this both as a gamer and game developer ….
English
@maxbatt @ManuVision Think about a 5 minute interactive video generated in a world model and then imported into Unity.
English
@MBromberg @ManuVision How do World Models create “assets” for Unity? World Models don’t create assets ….
English
Look at the stunning output of Unity creators! Congratulations.
Unity for Games@unitygames
Congratulations again to all the teams who were nominated and won at @TheGameAwards yesterday. We are so proud of this community and honored to see so many incredible creations powered by Unity! 🏆 Best Mobile Game - Umamusume: Pretty Derby (@umamusume_eng) 🏆 Best Action/Adventure Game - Hollow Knight: Silksong (@TeamCherryGames)
English
Unity 6.3 LTS is out! Long-term stability, smoother upgrades, production-tested performance optimizations, two years of support, and a verified ecosystem that just works. Full details in our blog: on.unity.com/Unity-6-3-LTS
English
Love seeing #MadeWithUnity games shine at the @GoldenJoysticks last week. Congrats to @AggroCrabGames, @LandfallGames, @TeamCherryGames, @RawFury, @semiworkstudios, @scopely, and @ScheduleOneGame — amazing work from incredible teams!
thegamer.com/golden-joystic…
English
@gamefromscratch I wouldn’t say you started it, but you definitely helped it along!
Game From Scratch@gamefromscratch
In perhaps the single biggest #gamedev news story of 2025... At #Unite 2025 - Unity(@unity) and Epic Games(@UnrealEngine) have announced a partnership... ...and GameFromScratch may have actually started it! CRAZY! gamefromscratch.com/unity-and-epic… #unrealEngine #unity3d
English
The fact that it makes @davidhelgason smile makes US smile. #Unity2025
David Helgason@davidhelgason
I don’t talk a lot about Unity here, but I remain on the board and as a major shareholder in my old baby, now turned a young adult. It puts a big smile on my face to be able to announce a partnership with my old frenemies up in Raleigh 🥰 CC @TimSweeneyEpic
English
Matthew Bromberg retweetledi
FORTNITE + UNITY ANNOUNCED 😱😭
You will be able to publish UNITY games inside Fortnite next year!
UNFN anybody? 🤯
youtube.com/live/CF1PwcIdL…
YouTube
English
Dilmer 👓@Dilmerv
Unity and Unreal CEO’s in the same stage, pretty amazing to see a collaboration between the biggest game engines in the world. This is incredible! 🔥Unity developers will be able to publish games directly into Fornite starting next year! Well done @TimSweeneyEpic & @MBromberg 👏
English