In this tool-assisted education video I create a raytracer from scratch.
The raytracer renders in 16-color VGA palette at 640x480 resolution.

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Source code:
‣ https://bisqwit.iki.fi/jkp/raytrace.cpp  (only compiles in Borland C++ 3.1 and runs in DOS; this is verbatim the program that I wrote in this video)
‣ https://bisqwit.iki.fi/jkp/raytrace2.cpp  (runs on most OSes, uses OpenMP thread-parallelism)
‣ https://bisqwit.iki.fi/jkp/raytrace3.cpp  (runs on most OSes, uses CUDA for GPU parallelism, depends on this header file: https://bisqwit.iki.fi/jkp/helper_cuda.h)

List of programs written by me that made this video possible:
- ADLMIDI (This plays MIDI files through OPL3 emulation)
- JAINPUT (Japanese input editor)
- E.EXE (Full-screen DOS editor)
- SPCPLAY (This plays SPC files, which are SNES music), however…