用opengl编程，每一个光源的diffuse, specular,ambient 成分和位置,可采用 RGBA 格式。观察茶壶的不同视角,从各个方位观察茶壶，(With opengl programming, the diffuse, specular,ambient and location of each light source can be used in RGBA format. Observe the teapot from different perspectives, and