public static double Angle(MVector3 from, MVector3 to)
{
// sqrt(a) * sqrt(b) = sqrt(a * b) -- valid for real numbers
double denominator = Math.Sqrt(from.SqrMagnitude() * to.SqrMagnitude());
if (denominator < kEpsilonNormalSqrt)
{
return(0F);
}
double dot = Clamp(Dot(from, to) / denominator, -1F, 1F);
return((Math.Acos(dot)) * Rad2Deg);
}