{"id":50426,"date":"2025-07-25T22:00:00","date_gmt":"2025-07-25T13:00:00","guid":{"rendered":"https:\/\/automaton-media.com\/en\/?p=50426"},"modified":"2025-07-25T17:50:52","modified_gmt":"2025-07-25T08:50:52","slug":"clair-obscur-expedition-33-uses-kawaii-physics-which-comes-as-a-pleasant-surprise-to-the-plugins-creator","status":"publish","type":"post","link":"https:\/\/automaton-media.com\/en\/news\/clair-obscur-expedition-33-uses-kawaii-physics-which-comes-as-a-pleasant-surprise-to-the-plugins-creator\/","title":{"rendered":"Clair Obscur: Expedition 33 uses Kawaii Physics, which comes as a pleasant surprise to the plugin\u2019s creator\u00a0"},"content":{"rendered":"\n<p>Japanese independent game developer Kazuya Okada (who goes by Okazu online) was recently surprised to find out that Clair Obscur: Expedition 33, one of the biggest hits of 2025, uses his open-source <strong>KawaiiPhysics <\/strong>plugin.&nbsp;<\/p>\n\n\n\n<p>KawaiiPhysics is a pseudo-physics plugin for Unreal Engine that simulates stylized (as opposed to realistic) physics. It applies to various movements, ranging from the bounce of a character\u2019s hair, to the sway of skirts and other flowy materials. With a lightweight and simple algorithm, the plugin helps developers achieve appealing, anime-inspired physics while bypassing much of the hassle involved in manually fine-tuning secondary physics animations. As you can see in the 2024 demo video below, the KawaiiPhysics engine lives up to its name.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"\u3010UE5\u3011Kawaii Physics Demo 20240723\" width=\"1160\" height=\"653\" src=\"https:\/\/www.youtube.com\/embed\/0f-l-SP07Mo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Okazu&#8217;s creation has long been the secret sauce of various games developed in Unreal Engine, including major titles like Persona 3 Reload, Stellar Blade and Tekken 8. On the other hand, there haven\u2019t been many prominent instances of commercial projects in the West using KawaiiPhysics. Until Sandfall Interactive\u2019s Clair Obscur: Expedition 33, that is.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Funnily enough, Okazu seems to have only found out recently that the hit RPG uses his creation. In an <a href=\"https:\/\/x.com\/pafuhana1213\/status\/1947618435695054945\" target=\"_blank\" rel=\"noreferrer noopener\">X post from July 22<\/a>, he shared a presentation slide from a lecture held by Sandfall Interactive on which his plugin is credited among other third-party software used in Expedition 33. \u201cIt looks like Clair Obscur Expedition 33 uses KawaiiPhysics! Thank you so much!!!\u201d Okazu commented. The source of the presentation slide is a <a href=\"https:\/\/cedec.cesa.or.jp\/2025\/timetable\/detail\/s681af54d73329\/\" target=\"_blank\" rel=\"noreferrer noopener\">CEDEC 2025 lecture<\/a> titled \u201c<em>Clair Obscur: Expedition 33 &#8211; Technical choices and challenges to support a wide scope with a programming team of 4 and Unreal Engine.<\/em>\u201d\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\"><p lang=\"ja\" dir=\"ltr\">CEDEC2025\u3067\u8b1b\u6f14\u304c\u3042\u3063\u305f\u300cClair Obscur: Expedition 33\u300d\u306b\u3066\u3001Kawaii Physics\u304c\u4f7f\u308f\u308c\u3066\u305f\u307f\u305f\u3044\u3067\u3059\uff01\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\uff01\uff01\uff01\uff08\u753b\u50cf\u4f7f\u7528\u8a31\u53ef\u3092\u8cb0\u3044\u6e08\uff09<a href=\"https:\/\/t.co\/zgQxW3JCv5\">https:\/\/t.co\/zgQxW3JCv5<\/a><a href=\"https:\/\/twitter.com\/hashtag\/KawaiiPhysics?src=hash&amp;ref_src=twsrc%5Etfw\">#KawaiiPhysics<\/a> <a href=\"https:\/\/twitter.com\/hashtag\/UE5?src=hash&amp;ref_src=twsrc%5Etfw\">#UE5<\/a> <a href=\"https:\/\/t.co\/sysf9XHd6N\">pic.twitter.com\/sysf9XHd6N<\/a><\/p>&mdash; \u304a\u304b\u305a (@pafuhana1213) <a href=\"https:\/\/twitter.com\/pafuhana1213\/status\/1947618435695054945?ref_src=twsrc%5Etfw\">July 22, 2025<\/a><\/blockquote><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\n<\/div><\/figure>\n\n\n\n<p>Okazu has a <a href=\"https:\/\/github.com\/pafuhana1213\/KawaiiPhysics\/wiki\/%E6%8E%A1%E7%94%A8%E5%AE%9F%E7%B8%BE-Adoption\" target=\"_blank\" rel=\"noreferrer noopener\">live list of games<\/a> that have used KawaiiPhysics, but as the plugin is issued under a liberal MIT License (to use the plugin, all you need to do is include its <a href=\"https:\/\/github.com\/pafuhana1213\/KawaiiPhysics\/blob\/master\/LICENSE\" target=\"_blank\" rel=\"noreferrer noopener\">copyright notice<\/a> somewhere in your game), it is likely impossible for him to keep track of every instance. On the flip side, this seems to lead to very pleasant surprises for the dev.&nbsp;<\/p>\n\n\n\n<p>KawaiiPhysics is Okazu\u2019s personal project, developed during his free time. While the plugin is available completely free of charge on <a href=\"https:\/\/github.com\/pafuhana1213\/KawaiiPhysics\/blob\/master\/README_en.md\" target=\"_blank\" rel=\"noreferrer noopener\">GitHub<\/a>, Okazu recently launched a paid version on <a href=\"https:\/\/www.fab.com\/listings\/f870c07e-0a02-4a78-a888-e52a22794572\" target=\"_blank\" rel=\"noreferrer noopener\">Fab<\/a> for users who\u2019d like to support him financially. There are no differences between the two versions, and Okazu has no plans to make KawaiiPhysics a paid-only plugin in the future. The developer is also accepting support for his work on the plugin via <a href=\"https:\/\/github.com\/sponsors\/pafuhana1213\" target=\"_blank\" rel=\"noreferrer noopener\">Github Sponsors.<\/a>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Former Capcom and Epic Games engineer Kazuya Okada was surprised to see Clair Obscur: Expedition 33 credit his passion project.<\/p>\n","protected":false},"author":55,"featured_media":50429,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[64,3],"tags":[17],"class_list":["post-50426","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-game-development","category-news","tag-japan-related-news"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Clair Obscur: Expedition 33 uses Kawaii Physics, which comes as a pleasant surprise to the plugin\u2019s creator\u00a0 - 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