Hacker News: araniwa

New comment by araniwa in "Show HN: Bad Apple (Oscilloscope-Like) – one stroke per frame"

araniwa — Mon, 13 Apr 2026 05:02:25 +0000

I rendered the classic Bad Apple!! video as a single continuous line on a virtual oscilloscope — all 6500 frames, animated with audio sync.

Source Code: https://github.com/ad-sho-loko/bad-apple-on-oscilloscope

Each frame goes through Canny edge detection, then a nearest-neighbor algorithm connects all the edge pixels into one unbroken path — like drawing each frame without lifting the pen.

The viewer is built with React + Three.js with post-processing glow effects to mimic a real CRT oscilloscope.

Inspired by this tweet: https://x.com/AhmedShahnab/status/2035330016725336065

Tech stack: - Python (OpenCV) for frame processing - React + Three.js + R3F for rendering - Cloudflare Pages for hosting

Show HN: Bad Apple (Oscilloscope-Like) – one stroke per frame

araniwa — Mon, 13 Apr 2026 05:01:58 +0000

Article URL: https://bad-apple-on-oscilloscope.pages.dev/

Comments URL: https://news.ycombinator.com/item?id=47747795

Points: 2

# Comments: 1

New comment by araniwa in "I gave every train in New York an instrument"

araniwa — Mon, 13 Apr 2026 02:35:19 +0000

Hello from Japan! I discovered TrainJazz this morning and enjoyed it with my morning coffee — the idea of turning subway movements into music is quietly beautiful.

I would love to see a Japanese version someday. Tokyo’s train network is one of the most complex in the world, and I imagine the music it would make would be extraordinary. Thank you for creating something so thoughtful.