I am working on ray tracing.
cmake .. -G"Unix Makefiles"
make
./tinyraytracer
https://github.com/ssloy/tinyraytracer/wiki/Part-1:-understandable-raytracing
https://raytracing.github.io/books/RayTracingInOneWeekend.html
https://raytracing.github.io/books/RayTracingTheNextWeek.html
https://raytracing.github.io/books/RayTracingTheRestOfYourLife.html