实现了Koch Snow雪花的分形，并且实现了拾取和拖拽等交互功能

NeHe教程，在win32下用OpenGL做的拾取游戏。适合OpenGL入门，涉及Alpha混合, Alpha测试, 排序，教的东西很多-The NeHe tutorial using OpenGL under win32 pickup game. Suitable for the OpenGL entry-involving Alpha Blending, Alpha testing, sorting, taught a lot of things

利用opengl画一个二维的猫脸，可以根据鼠标点击选中部分进行移动，是图形拾取的典型例子。-Opengl draw a two-dimensional cat face, can be moved according to the mouse click on the selected part, is a typical example of graphical picking.