说明：  在vc环境下运用opengl绘制的颜色立方体。这是一个采用光滑着色的立方体， 立方体的表面从一角的一种颜色渐变到正对角落的另一种颜色，还可以用键 盘上的箭头键来旋转该色彩立方体，观察它的各边各
(Vc environment in the use of the color cube opengl rendering. This is a cube using smooth shading, the surface of the cube a different color from the corner is on the corner of gradual change to another color, also can use the arrow keys on your keyboard to rotate the color cube to observe it on all sides of the)