[n.d.ageev@gmail.com]

I try to make the shape optimization of the half-model (with symmetry plane). I want to move the points in the symmetry plane. But I also want to have 1st derivative continuity of the ffd. How to make it? I tried to make the ffd box penegrating symmetry plane, but in this case grad=0. If I make no_derivative then I have continuity problems. I hope that ffd_fix_i can help but I don't clearly understand how it works.