Introduction - If you have any usage issues, please Google them yourself
Three-dimensional drawing program. This is a project to use to the " three-dimensional space vector/point" category and related functions, use them to define a space vector/point to achieve the translation vector, scaling and rotation, etc. can also be achieved using the correlation function 2 vector cross multiplication, to get a vector of the absolute length of a vector unit received a three-point decision to the vertical plane of the vector (after unit-based), get the distance between two points in space, to be two vector dot product, to be the angle between two vectors such operations, the use of user-friendly, each function has a detailed comment, hope you all have a use.