Implement and interpretation based on "Ray Tracing in One Weekend"

Usage

Following in your terminal:

git clone https://github.com/bobouc/RAYTRACING_IN_ONE_WEEKEND_interpretation.git
cd RAYTRACING_IN_ONE_WEEKEND_interpretation
mkdir build && cd build
cmake .. && make
./RayTracing  > a.ppm

Then open a.ppm format image with ppm image viewer.