I built an interactive cloth solver for Apple Vision Pro
A bit more context - the cloth sim is part of my app, Lungy (https://www.lungy.app). It's designed to be an active meditation / relaxation app, so you can play relaxing instruments in space and immersive breathing exercises. The original Lungy is a breathing app available for iOS, that uses real-time breathing with interactive visuals. The cloth sim is a Verlet integration, running on a regular grid. For now, I have tried a couple of different cloth scenes - a sort of touch reactive 'pad', where different parts of the cloth are mapped to different sounds and a cloth that blows…
I built an interactive cloth solver for Apple Vision Pro launched on May 31, 2024 with 99 votes, #502 of 4,539 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Lungy is a meditation and relaxation app for Apple Vision Pro that combines interactive cloth simulation with immersive breathing exercises and spatial instrument play. The cloth responds to touch and breathing, with different areas mapped to relaxing sounds. Built on Verlet integration physics, it extends the original iOS breathing app's real-time visual feedback into an immersive spatial experience. The app is available free on the App Store.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
A bit more context - the cloth sim is part of my app, Lungy (https://www.lungy.app). It's designed to be an active meditation / relaxation app, so you can play relaxing instruments in space and immersive breathing exercises. The original Lungy is a breathing app available for iOS, that uses real-time…
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I'm a doctor and made a responsive breathing app for stress and anxiety2023 · lungy.app · ▲666Hey HN! Some more info: I’m an NHS doctor and the founder of Pi-A (https://www.pi-a.io) which developed Lungy (https://www.lungy.app). Lungy is an app (iOS only for now) that responds to breathing in real-time and was designed to make breathing exercises more engaging and beneficial to do. It hopefully has many aspects of interest to the HN community – real-time fluid, cloth and soft body sims running on the phone’s GPU. My background is as a junior surgical trainee and I started building Lungy in 2020 during the first COVID lockdown in London. During COVID, there were…
I'm a doctor and built a responsive breathing app for anxiety and sleep2025 · apps.apple.com · ▲103Hey HN! I’m an NHS doctor and the founder of Pia (https://www.piahealth.co) which developed Lungy (https://www.lungy.app). Lungy is an iOS app that responds to breathing in real-time and was designed to make breathing exercises more engaging and beneficial to do. It’s been two years since Lungy launched (here’s the original ShowHN: https://news.ycombinator.com/item?id=34534615) and it's had a huge update and complete redesign. We rebuilt the whole app, and added a real-time 3D soft body solver which gives some really cool interactions like blobs /…
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Source: Show HN post ↗ · launch text quoted in part
