Experimenting raytracing with shadertoy
https://raytracing.github.io/books/RayTracingInOneWeekend.html
https://www.shadertoy.com/view/WdGBzV
https://www.shadertoy.com/view/3sGBzV
https://www.shadertoy.com/view/wdKfWV
https://www.shadertoy.com/view/3sKBWd
https://www.shadertoy.com/view/wt3yR7
https://www.shadertoy.com/view/3l3yD4
https://raytracing.github.io/books/RayTracingTheNextWeek.html
https://www.shadertoy.com/view/wlccW4
https://www.shadertoy.com/view/wl3cRs
https://www.shadertoy.com/view/3lKcDh