这是理解隐函数 如f(x,y,z)=0，作图的算法的一个最基本的程序，



key:



1. q or w 绕x轴旋转



2. a or s 绕y轴旋转



3. z or x 绕z轴旋转-This the understanding implicit function f (x, y, z) = 0, the mapping algorithm of a basic procedure key : 1. w q or x-axis rotation around two. 's or a y-axis rotation around three. z or x rotation around the z axis