[HN Gopher] Show HN: TromPhone, a Trombone for Your Phone
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       Show HN: TromPhone, a Trombone for Your Phone
        
       A few months ago I had a silly idea of making a mobile app that
       used the accelerometer to track the slide motion for playing a
       virtual trombone. Just wanted to share the story of bringing it to
       fruition here on hn.  I started out spending a couple days trying
       to get something cross-platform going in Flutter, but it soon
       became clear that wasn't the best fit, seeing as I'd need native
       hooks for most of what the app needed to do, and it wasn't yet
       clear it'd be possible at all. So I switched to making it an iOS
       app in Swift. The accelerometer data turned out to be not nearly
       accurate enough to do the job, so I switched to using the camera/AR
       using ARKit... and it worked instantly. Like the very first time I
       hooked up a slider UI element to the distance function. It felt a
       bit like magic. And also just ridiculous.  Here's a video I
       recorded to send to some friends at the time:
       https://youtu.be/6BIogfGH3IQ  Here's a video of it in action in
       it's current state:
       https://youtube.com/shorts/8kS2TRzV4I4?feature=share  Apologies for
       the non-responsive website (using nextjs on cloudflare). It doesn't
       look great on mobile, which is kind of inexcusable, I'm working on
       it: https://www.tromphoneapp.com  Anyway, I'm not sure where I'll
       take it from here. I have some ideas for more AR content like hats,
       heart eyes, etc. Possibly a song editor so users can add songs that
       might have issues with copyright if I included them in the app? Any
       ideas you guys have would be fun to hear.
        
       Author : depsypher
       Score  : 13 points
       Date   : 2022-12-07 18:48 UTC (4 hours ago)
        
       | rjewell wrote:
       | I held it up in front of my daughter without telling her what it
       | was, and when i tapped the screen she fell over backwards in
       | shock. Perfectly executed.
        
       | latchkey wrote:
       | That's a really silly great idea. Nice work!
        
       | ralphw wrote:
       | Cool!
       | 
       | Some kind of "arm exercise for musicians" fitness app might be
       | interesting, kind of a Guitar Hero meets Dance Dance Revolution
       | mashup.
       | 
       | People might need to be cautioned to use arm weights AND hold
       | their iPhone at the same time.
        
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       (page generated 2022-12-07 23:02 UTC)