private void BuildBSpline()
{
BSpline spline = new BSpline();
for (int i = 0; i < Entity.sons_.Count; i++)
{
spline.AddControlPoint(Entity.sons_[i].transform_.WorldPosition());
}
spline.Degree = 2;
spline.Loop = false;
spline.Clamp = true;
spline.SetDiscretisation(100);
spline.ConstructSpline();
BuildCurve(spline.GetCurve());
}