{"ok":true,"trend":{"id":608661,"platform":"hn","region":"global","key":"speeding up the separating axis test using inscribed spheres","title":"Speeding up the separating axis test using inscribed spheres","url":"https://box2d.org/posts/2026/09/inscribed-spheres/","first_seen":"2026-10-01T12:35:39.657772Z","last_seen":"2026-10-01T13:05:39.751664Z","last_rank":28,"peak_rank":28,"last_volume":4,"peak_volume":4,"seen_count":3,"score":0.52578125,"category_hint":null,"section":null,"category":null,"summary":"Box2D author Erin Catto has published a technical write-up on accelerating the separating axis test, a core algorithm in physics engines, by using inscribed spheres. The post walks through how the geometric optimization reduces the work needed to detect overlaps between shapes, an operation run millions of times per frame in games and simulations.","why":"Game and physics engine developers find low-level collision detection optimizations directly useful for real-time simulation performance","tone":"neutral","entities":["Box2D","Erin Catto","separating axis test"],"summarized_at":"2026-10-01T12:37:45.181004Z","meta":{"lang":"en","link":"https://box2d.org/posts/2026/09/inscribed-spheres/","hn_id":"49902290","comments":0},"nw":null,"promo":null,"kind":null,"importance":null,"hidden":false,"hide_reason":null,"judged_at":null,"title_en":"Speeding up collision detection with inscribed spheres","timeline":[{"captured_at":"2026-10-01T12:35:39.657772Z","rank":29,"volume":3},{"captured_at":"2026-10-01T12:50:39.649105Z","rank":29,"volume":4},{"captured_at":"2026-10-01T13:05:39.751664Z","rank":28,"volume":4}],"posts":[{"platform":"hn","url":"https://news.ycombinator.com/item?id=49902290","author":"panic","title":"Speeding up the separating axis test using inscribed spheres","snippet":null,"posted_at":"2026-09-29T23:30:32Z","likes":4}],"elsewhere":[],"window":"7d"}}