Building a World
The first step is to implement the world object. Think of how much work it was to render a single sphere, and then multiply that by dozens of objects. You begin to see what you gain by having something that will keep track of all of those things for you.
Initially, a world is empty, containing no objects and no light source. Write a test like the following, demonstrating a world function that returns just such a data structure.
| | Scenario: Creating a world |
| | Given w ← world() |
| | Then w contains no objects |
| | And w has no light source |
Some of the tests you’ll write in this chapter assume a default world exists with a light source at (-10, 10, -10). This world contains two concentric spheres, where the ...
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