The raytracer up till now has only used flat colors for surfaces. The lighting has added a lot of detail and realism to the scene, but surfaces in real life are never so flatly colored.
One mechanism we can use is procedural texturing. In essence, we calculate the color of the surface based on a couple of available geometric parameters.
In the image above the floor color is calculated across the surface in a grid-based pattern. Adding these details to the materials of the objects adds a lot of interest to the scene.
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