OpenGL入门,以太阳、地球作为例子，把太阳作为光源，模拟地球围绕太阳转动时光照的变化。于是，需要设置一个光源——太阳，设置两种材质——太阳的材质和地球的材质。-OpenGL entry to the sun, the earth as an example, the sun as the light source to simulate the Earth' s rotation around the sun light changes. Thus, the need to set