Spheres are nice and all, but we need more shapes to make the world go around. So, a little bit of refactoring to get most the juicy bits from spheres apply to every kind of shape, such as planes. So flat, and infinite.

After todays work we can render the shadows cast by objects in our scenes!

With the development environment fixed, using the previous progress to render a world with multiple is as simple as creating the camera:

No progress because it turned out that the Ruby / bundler environment on my laptop was not functional anymore, so the little time I had while away over the weekend got wasted on debugging why nothing worked instead of doing something productive.