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Show HN: Turning Hand Movement into Music

3 getToTheChopin 2 8/15/2025, 2:43:27 PM twitter.com ↗

I'm experimenting with a musical instrument design, using hand rotation to change tempo and note cycles.

Created with javascript, mediapipe computer vision, tonejs, threejs.

This runs in real-time in the browser.

Live demo here (requires webcam access): https://www.funwithcomputervision.com/radial/

Comments (2)

nimzoLarsen · 3h ago

this is really cool, I like the UI and it sounds a lot better than I was expecting it to

getToTheChopin · 3h ago

Thank you! I spent a lot of time tuning the synth parameters in tonejs to try to get something I was happy with.

The scales are based on the Japanese "in" pentatonic scale (sometimes called the Sakura scale), which I find really pretty.