I've been playing around with Lua on PNaCl and some glue to make things happen in a browser.
So here is a jsfiddle of a bouncing 3d "Amiga Ball" with live editable lua source code.
Assuming it works (it needs a recent chrome and a machine that can handle webgl) you can fiddle around a bit with lua and gl live on the web. If you have some understanding of js,lua and gles2 it should be reasonably obvious whats going on there. Probably :)
Cheers,
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