This is a horrible / lousy / extremely inefficient 3D engine written in javascript.
I use the Processing library to draw the triangles.
I project every triangle to the 3D space using maths and stuff. I don't even use any kind of matrices. Can you imagine a 3D engine without matrices? Now you can.
It's so inefficient the Mario model from SM64 already lags. Outrageous!
https://dcostap.github.io/3d-engine-javascript/
none lol