etl::hermite<Vector> curve(segment.p1,segment.p2,segment.t1,segment.t2);
etl::derivative< etl::hermite<Vector> > deriv(curve);
-#ifdef ETL_FIXED_DERIVATIVE
- return deriv((*amount_)(t).get(Real()))*(0.5);
-#else
- return deriv((*amount_)(t).get(Real()))*(-0.5);
-#endif
-
+ return deriv((*amount_)(t).get(Real()));
}