ug中关于UF_CURVE_create_spline_thru_pts

在UF_CURVE_create_spline_thre_pts中有一项double  parameters[ ] 说明中这样解释parameters of input points. This is a user specified
parameterization for the input points, which needs to be
monotonic increasing (i.e. parameters(i) < parameters(i+1)
for all i), but does not need to be normalized, if NULL
then the default parameterization will be used.其中这句if NULL then the default parameterization will be used我想应用这个NULL但又不知道怎么把它赋给parameters[]，请求高手帮助.

UF_CURVE_create_spline_thre_pts(...NULL...)

谢谢，好用了

UF_CALL( UF_CURVE_create_spline_thru_pts(degree,
      periodicity,  //是否封闭，0不封闭。
      point_number,
      point_data,
      NULL,
      save_def_data,  //If save_def_data = 1, save input defining
      //data with the created spline. Otherwise, no.
      [$spline_tag))]