Writing ESSL programs
Let's now take a step back and take a look at the big picture. ESSL allows us to implement a lighting strategy provided that we define a shading method and a light reflection model. In this section, we will take a sphere as the object that we want to illuminate and we will see how the selection of a lighting strategy changes the scene.
We will see two scenarios for Goraud interpolation: with Lambertian and with Phong reflections; and only one case for Phong interpolation: under Phong shading the Lambertian reflection model is no different from a Phong reflection model where the ambient and specular components are set to zero. ...
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