Opengl普现的小茶壶，功能包括了红宝书的大部分章节，最重要的是采用了拖动时能保鼠标和茶壶相对不变的算法-Opengl general are small teapot features include the Little Red Book of most of the chapters, the most important thing is security when using the mouse and drag the relatively constant algorithm t

通过鼠标输入点，鼠标每次按下左键，就会显示红点，可以有n个点-Mouse input, the mouse each time you press the left button, it will show a red dot, you can have n points