Introduction - If you have any usage issues, please Google them yourself
This a" three dimensional space vector/point" and related functions, they are used to define a space vector/point, realization of vector translation, scaling and rotation, the use of correlation function can also realize the two vector product, to get a vector of absolute length, a vector unit, get a three decision points on the plane perpendicular to the vector (the unit ), to get the distance between two points in space, two dot product of vectors, obtains two vector included angle and other operations, for the convenience of users, each function has detailed notes.