Game devs: in your game/experience what percentage of the enabled dynamic physics objects are moving per frame (with the rest sleeping)?

On the eve of Cyberpunk 2077 Phantom Liberty and DLSS 3.5 Ray Reconstruction's debut I sat down with Jakub Knapik from CDPR, Bryan Catanzaro and Jacob Freeman from Nvidia, and Pedro Valadas from to discuss the DLSS in the game now, its past and future. Enjoy! youtu.be/Qv9SLtojkTU?fe…

New Box2D v3 blog post: Simulation Islands box2d.org/posts/2023/10/… This reviews my journey in making island management scale better for multicore processing.

Been putting this off for a while but finally gonna do another tech stream. It's gonna be a shorter brain-dump about networking/replicating animation with some some prototypes in Esoterica. Sunday at 9am PST/6pm CET youtube.com/live/mKBDhC6-t…

Recently I started a side project called Solver2D github.com/erincatto/solv… to compare many different 2D rigid body solvers, including PGS, TGS, NGS, and XPBD. Read about it here box2d.org/posts/2024/02/… and see the solvers compared here youtube.com/watch?v=sKHf_o…

I made a small update to the Solver2D post with a basic performance analysis. box2d.org/posts/2024/02/…

New blog post on graph coloring and SIMD. box2d.org/posts/2024/08/…

Following up to my previous post. I added M2 scalar numbers to compare with hand-coded ARM Neon instructions. I double checked my results. Neon is a surprisingly large gain on M2. It seems like Apple designed this chip to run Box2D fast.

Windows: "You are streaming Netflix. Put the branch prediction to sleep." AMD: "Are you sure? This looks like Gears of War."

New blog post: Determinism box2d.org/posts/2024/08/…

I've been working on Box2D v3.1 and found this pleasant effect while testing. youtu.be/IjObMkufU9I

Here's a closer look at the new physics-based Player Controller in s&box, why we made it, and what it does 📄sbox.game/news/player-co…

New Unity 2D physics based on Box2D v3.1 coming along really well, demonstrated here in a new Sandbox app that can be built and run on any platform. youtu.be/ksKVvwvpXX4?si…

Conventional wisdom is that you need a complex and expensive direct solver to handle high mass ratios and long chains. Box2D has an iterative SoftStep solver that uses sub-stepping and soft constraints to handle high mass ratios and long chains. youtube.com/watch?v=aiFuTv…

Box2D version 3.1 is released! Blog post: box2d.org/posts/2025/04/… Release notes: github.com/erincatto/box2… Documentation: box2d.org/documentation/

I had a nice chat with Ryan and the crew at the UD Game Dev Club!

Unity 6.3a5 will be released this week and contains the new low-level 2D physics. youtu.be/hSImaYEr9Gs?si…