一棵三维L系统分型树，树枝末端是圆孔形叶子，通过拖拽或者键盘可实现树的上下左右旋转，放大缩小等功能。(A three dimensional L system parting tree, the end of the tree is a round hole leaf. Through drag and drop or keyboard, the tree can be rotated, enlarged and reduced.)

Opengl光照鼠标键盘控制位移贴图等等，附带视频展示说明等等大量信息(Opengl illumination, mouse keyboard control, displacement mapping, etc., with video presentation instructions)

绘制的雪人是动态旋转效果，可以依据键盘响应事件，将动画效果做出改变，该实验内容中，按‘ａ’键可以绕ｙ轴旋转，按‘ｄ’键可以绕ｚ轴旋转，按‘ｓ’轴可以绕ｘ轴旋转，按‘ｗ’键可以进行光照渲染，按‘ｑ’键或者‘Esc’键起着退出程序的作用。(The painted snowman is a dynamic rotation effect, can be based on the keyboard response events, the animation effect changes, in thi