Yep, right, a whole raytracer written in JavaScript. The UI is ok: you can add objects, light sources, and so on, to your scene and render it on the page. There is no server interaction as far as I've seen. Neat. Rendering a 40x30(!) pixel image is fast - I also tried 400x300 with a simple sphere and it finished after 247 seconds ;-).

[tags]javascript, raytracer[/tags]