Creating a Doom-style 3D engine in C

In this tool-assisted education video I walk through the creation of a Duke Nukem 3D style software-rendering pseudo-3D engine from scratch. Topics such as vector rotation and portal rendering are at the core. SUBTITLES ARE AVAILABLE. This homebrew software-rendering 3D engine supports multistair architecture and non-Euclidean geometry, much like Duke Nukem 3D. The geometry can be tweaked at run time without performance penalties, to create things like ceiling crushers or rotating doors. For rendering, it