三维曲面（球面、圆柱面或按正弦函数起伏的曲面），设置合适的光源及材质，应用环境光、漫反射及镜面反射，显示有光照效果的曲面图形，可以改变光源的位置及材质，观察光照效果的变化。(Three dimensional surface (spherical and cylindrical surface or by the ups and downs of the sine function), light and suitable materials, application of ambient light, diffuse and specular surfaces, graphic display light effect, can change the location and material source, observe the change of illumination effect.)