制作一个曲面光照效果的演示界面，如图所示，三个弹出式菜单分别用于选择曲面形式、色彩图、光照模式和反射模式，三个滚动条用于确定光源的位置，一个按钮用于退出演示。-To make a demo interface surface lighting effects, as shown, three pop-up menu used to select the surface in the form, color map, the light mode and reflection mode, three scroll bars used to determine the location of the light source, a button is used to Exit the demo.