用opengl画的球，按abcd可出现4个不同的图案，网状球体，不透明球体，等等。是本人计算机图形学第一个course work-opengl painting with the ball by abcd, there will be four different designs mesh spherical, opaque sphere, and so on. I was a computer graphics course work

误差区域阴影化，以绘制方差曲线为例，可将方差结果阴影化，且可有透明与不透明两种选择(Makes a 2-d line plot with a pretty shaded error bar made using patch. Error bar color is chosen automatically.)