Back in ~2015 Philip Buuck did a video series called Handmade Quake where he analyzed every file while trying to rewrite Quake 1 from scratch. This of course generated buzz and soon enough he got hired by Epic, as a result everything got scrubbed and deleted, his videos, his blog, all of it gone.
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[ 80.9 ms ] story [ 580 ms ] threadhttps://www.dropbox.com/sh/ys78z42mor5pn8o/AACrYiVVOUdnxzFH3...
Code is here:
https://github.com/philipbuuck/HandmadeQuake