Implementation of the tutorial "Building a Ray Tracer in Python" from Arun Ravindran. https://www.youtube.com/playlist?list=PL8ENypDVcs3H-TxOXOzwDyCm5f2fGXlIS
- Create a 3D vector class.
- Create a PPM image.
- Create an image of 3D spheres.
- Create simple lights.
- Run the renderer on multiple processes.
No shadow.
