Time for Action: Coloring the Cube

Let's cover a simple example of coloring a geometry:

1. Open the ch06_01_cube.html file using your browser. You will see a page similar to the following:

2. In this exercise, we’re going to compare constant versus per-vertex coloring. Let's talk about the page's widgets:
   • Lambert: When selected, it will include the Lambert coefficient in the calculation of the final color.
   • Per Vertex: The two different coloring methods explained before: per-vertex or constant.
   • Complex Cube: Loads a JSON object where the vertices are repeated with the goal of obtaining multiple normals and multiple colors per vertex. We will explain how this works later on.
   • Alpha Value: This slider is mapped to the uAlpha float uniform in the vertex shader. uAlpha sets the alpha value for the vertex color.

3. Disable the use of the Lambert coefficient by clicking...