通过点数据创建样条曲线（UGNX二次开发）

        ///         /// 通过点数据创建样条曲线        ///         /// x,y,z的顺序依次排        /// 0=non-periodic, 1=periodic        ///         public void CreateSplineByPointsCoordinates(double[] points, int periodicity, out Tag spline_tag)        {             int points_num = points.Length / 3;            int degree = 3;            UFCurve.PtSlopeCrvatr[] point_data = new UFCurve.PtSlopeCrvatr[points_num];            int save_def_data = 1;            int i = 0;            for (i = 0; i < points_num; i++)            {                 point_data[i].point = new double[3];                point_data[i].point[0] = points[