Math-Get Angle between two vectors

From Vectorlab

Returns the angle between two vectors. By Orso B. Schmid

{ Orso ***************************** }
{ returns the angle between two vectors }
FUNCTION M_GetAngle2Vec(v1, v2: VECTOR): REAL;
    BEGIN
        M_GetAngle2Vec := Rad2Deg(ArcCos(DotProduct(
            UnitVec(v1), UnitVec(v2)
            )));
    END;