As an extension from project $3,$ for this project, you need to do the coloring on the object surface to make

a more realistic $3$D look. Recall what we have learned in the class, there are three types of illumination

models: diffuse, ambient, and phong terms. So you need to apply these three illumination principles to generate a

plausible RGB color for each $3$D unit. Since the bunny object consists of multiple triangles. For this assignment, you

need to use the flat shading mode to render the Bunny object. In other word, the shading unit is a triangle. All the

surface points from the same triangle have the same RGB color.