Returns the true angle in degrees from vector v1 to vector v2 in 3-space. A third "normal" vector v3 is used to determine the direction of measurement, using the right-hand rule. Negative angles are not returned.
angle2Vectors ( v1 As Vector, _
v2 As Vector, _
v3 As Vector ) As Number
A vector, not in the plane formed by v1 and v2, used to pick between the two choices for angle.