i know the most important feature of simplevector is that,every simplevector have a direction.
for example ,if i want cal the angle of a:(0,0,-1),b(0,0,1).
if use a.calcAngle(b),
the result is 0.
in fact the result is wrong,in the reality,the result is pi/2.
may be i can use other math method,but it is not convenient.
Any suggest?i just want cal the more correcter angle of simplevector,which has a direction.