I use: https://raytracing.github.io/books/RayTracingInOneWeekend.html https://raytracing.github.io/books/RayTracingInOneWeekend.ht... I second the advice of lo

I use: https://raytracing.github.io/books/RayTracingInOneWeekend.html https://raytracing.github.io/books/RayTracingInOneWeekend.ht... I second the advice of loading .obj, it's a good exercise. Implementing Octrees is another good one that will speed up your code while exploring tree structures in that language.