三维图形的处理，包括简单的叉积，点积，以及向量的旋转，对称和反射，点到面距离，投影，等等。-Processing of three-dimensional graphics, including simple cross product, dot product, as well as vector rotation, symmetry and reflection, point to surface distance, projection, and so on.

实现图形学中向量计算的一个基础类，包括点乘、叉乘等运算-Implement a base class graphics vector calculation, including dot product, cross product and other computing