Vector Algebra Functions

This chapter documents all functions related to "vector" algebra.

vector : a 2D or 3D coordinate list, like a normal Lisp "point" in format (list x y) or (list x y z);
all functions support point or vector input arguments as 2D and 3D always.

plane : a geometric plane is specified as list of the plane's origin point (2D/3D) and the plane's normal vector (3D) :
(list (list originX originY [originZ]) (list normX normY normZ))

The normal vector of the plane can be a non-normalised vector, it is internally normalised if necessary

All returned vectors and points are always 3D : (list x y z)