raycasting + floorcasting

raycasting was a very used 3D rendering technique in the 90s when computers had not enough power to display real time polygonal 3D as todays, it is also called 2.5D or pseudo 3D. one of the most popular games that used this technique was Wolfenstein 3D and Doom (id software), back then games were mostly all written in C programming language and assembly (machine language) for speed and optimization purpose, one famous programmer who optimized this technique was John Carmack (Doom, Wolfenstein 3D...