二维可交互的卡通人脸，按↑可旋转，可以用鼠标拖动其在窗口中的位置，可以右键菜单更改颜色，适合opengl初学者-。--Dimensional interactive cartoon faces, press ↑ to rotate, you can drag its location in the window with the mouse, you can right-click menu to change the color, suitable for beginners opengl-.-