I would argue that this is terrible code. It's not using the appropriate tools (webGL), it's badly structured, uncommented and unmaintainable (seriously, why on earth would anyone name their variables zd, _zd and __zd?). The Minecraft source code is also of notoriously poor quality. I honestly don't understand how you came to your conclusion.
It's an handful amount of lines of code doing a world generation, texture map generation, and ray casting rendering with a few tricks like a simple lightning model that still looks good.
All this using nothing more than a frame buffer, so you could port this easily from a C64 to any other computer. This code contains a lot of knowledge VS use of pre-build APIs.
If a programmer reads this code and understands how every part works, he or she ends knowing a lot more about computer graphics than before.
>This code contains a lot of knowledge VS use of pre-build APIs.
It contains a lot of general knowledge about 3D graphics, and absolutely 0 specific knowledge about the environment in which it's running. All he's accomplished by doing it this way is show off that he knows trig and prevent any of it from being hardware accelerated.
>If a programmer reads this code and understands how every part works
