paper physics
A free computer vision demo — play it in your browser, no install. Draw a physics scene on paper, take a photo, and watch it move. Sketch recognition with OpenCV.js + rigid-body physics with Matter.js, all in the browser.
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Open the live demo Source on GitHubFrom the README
Draw a physics scene on paper, take a photo, and watch it move.
Circles become balls, boxes and triangles become solid blocks, lines and curves become fixed ground, and an arrow touching a shape gives it a push. Everything runs in the browser. There is no server, and the photo never leaves your device.
js/detect.js is a pure function of an image, so the same code runs in the browser and in the Node tests. In the browser it runs in a Web Worker (js/vision-worker.js), so neither compiling the 10 MB OpenCV build nor reading a photo freezes the page.
The pen width isn't hard-coded.
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