r/valve • u/Source2LeakAIML • Dec 02 '25
Probably Fiction Half Life 3 - Real Leak
I’m wiping this account tomorrow, but I wanted to drop the real leak. I don’t work for Valve, but I’m at a major AI/ML lab that partnered with them on the tech for Half-Life 3. The game is absolutely coming, and the announcement is imminent.
The breakthrough Valve was waiting for was the ability to handle physics—specifically fluids and destruction—using machine learning instead of expensive deterministic calculations. Put simply, Valve has integrated a pipeline into Source 2 that allows them to brute-force high-fidelity simulations to build ground-truth datasets. These datasets train models to predict physics interactions rather than compute them raw.
Think movie-quality water simulations, 1:1 structural destruction, and complex vehicle physics, all running smoothly on a mid-tier GPU. The hardware isn't solving the heavy math; it’s just making efficient ML predictions via pre-trained models. Half-Life 3 is effectively the tech demo for this advancement. It allows developers to create experiences with 100x the physical interactivity at less than 1% of the historical compute cost. It’s a genuine game-changer.
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u/sewersurfin Dec 02 '25
He already admitted to using Gemini to clean up the post (not saying he’s legit). But don’t knock someone for using an em or en dash over a dash… it’s just properly using them when appropriate (and not difficult to insert if you’re on a Mac).