public static bool operator !=(Vector3d lhs, Vector3d rhs)
 {
     return((double)Vector3d.SqrMagnitude(lhs - rhs) >= 0.0 / 1.0);
 }
 public static bool operator ==(Vector3d lhs, Vector3d rhs)
 {
     return(Vector3d.SqrMagnitude(lhs - rhs) < 0.0 / 1.0);
 }