ABSTRACT
In this chapter, the authors explain describe some techniques to enhance realism without compromising performance. The authors suggest that the number of transparent objects in the scene is relatively small. They discuss the most commonly used Phong Illumination model named after Bui Tuong Phong. But more complicated models can also be employed for this purpose at the cost of performance. The authors consider a sampling of the light vectors, indicating the amount of light seen in that direction, in red and show diffused reflection where equal amount of light is reflected in all directions illustrated by the equal length of the red vectors. Computing illumination of a scene is an extremely complex problem. Henri Gouraud shading computes the illumination only at the vertices of the triangle then using then normal at the vertices, and interpolates the color in the interior of the triangle, without reconstructing the normal in the interior of the triangles.
