- Real delta_v = grow_dir_ * 0.1;
-
- Real start_v = dynamics_[0]->volume_;
- if (dynamics_.back ()->volume_ < 0)
- dynamics_.back ()->volume_ = max (min (start_v + grow_dir_ * 0.25, 1.0), 0.1);
-
- delta_v = dynamics_.back ()->volume_ - dynamics_[0]->volume_;
-
- Moment start = dynamics_[0]->get_column ()->when ();