Function: ANGLE-BETWEEN-VECTORS

Function: Angle-Between-Vectors

ANGLE-BETWEEN-VECTORS number
Returns the angle in radians between vector-1 and vector-2. If no reference-vector given, the smallest possible angle is returned. If a reference-vector is given, computes according to the right-hand rule. If -ve is given, returns a negative number for angle if it really is negative according to the right-hand rule.
arguments:
vector-1 3D Vector
vector-2 3D Vector
optional arguments:
reference-vector 3D Vector, Default Value: NIL
keyword arguments:
epsilon Number, Default Value: *ZERO-EPSILON*
Determines how small of an angle is considered to be zero
-ve Boolean, Default Value: NIL

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