Magnetic Field — Live Magnetic Field Lines
Live magnetic field lines, in one HTML file. Drag magnet, click flip.
Live magnetic field lines, built entirely in code: one self-contained HTML file with no images, no 3D models and no build step. Under the hood: Three.js, live field-line tracing from monopole pairs, flowing dash shader, 4,000 instanced iron filings. What a visitor can do: drag the right magnet, click to flip its polarity, 4 presets (Lab, Neon, Aurora, Copper). Best for: Science, EV, energy, engineering, education. Three.js loads from a CDN through an import map, so there is still nothing to install. Every colour, count and speed sits in one CONFIG block, presets switch live from a glass dock, and ?embed strips the interface for a clean iframe or hero background.
How to run this
Nothing to install and nothing to configure. Works in any modern browser on Windows, macOS and Linux.
- Built with
- Single HTML file
- Requires
- A modern browser
- 1. Unzip the download.
- 2. Double-click index.html. It opens in your browser and runs. To serve it instead (the microphone and some browsers want a server), run
npx serve .in the folder and openhttp://localhost:3000.
Note — Three.js loads from the jsDelivr CDN through an import map, so the first load needs an internet connection. Add ?embed to hide the interface for an iframe or hero background, and ?preset=N to start on a colour preset.
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