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函数结构：
UF_MODL_ask_2dtrim_bsurf
(
tag_t face,
int opts [ 4 ],
double tolerance,
UF_MODL_bsurface_p_t bsurf,
int * loop_count,
int * * edge_count,
int * * edge_sense,
tag_t * * edge_bcurves
)

函数说明：
返回与输入脸或身体相关联的B面的数据（具有单个面）标记。在这种结构的基础数据应该是通过调用UF_MODL_free_bsurf_data释放。注：此功能支持所有类型的脸

函数参数：
第1个参数为输入：
face代表参数变量，tag_t 为输入参数类型，面部或身体（有单面）标签被询问道。对于所有类型的脸

第2个参数为输入：
输入int 整数型的参数，参数的变量格式为opts [ 4 ]，转换选项[0] - 立方度（N/ A）[1] - 非理性的（N/ A）[2] - 非周期（1 - 是，0否）[3] - 标准化参数（1 - 是的，0-没有）

第3个参数为输入：
输入double 双精度类型的参数，参数的变量格式为tolerance，转换和SP-曲线公差

第4个参数为输出：
bsurf代表参数变量，UF_MODL_bsurface_p_t 为输出参数类型，返回B-表面信息。用户应分配一个UF_MODL_bsurface_t结构，并通过在一个指针于这种结构。这个程序将填补这一结构与动态分配的数据。这必须通过调用UF_MODL_free_bsurf_data释放。

第5个参数为输出：
输出int * 整数型的参数，参数的变量格式为loop_count，微调循环数

第6个参数为输出：
输出int * * 整数型的参数，参数的变量格式为edge_count，阵列中的每个环边缘CNT

第7个参数为输出：
输出int * * 整数型的参数，参数的变量格式为edge_sense，阵列的每个品种的边缘感

第8个参数为输出：
edge_bcurves代表参数变量，tag_t * * 为输出参数类型，阵列二维修剪曲线ID

UF_MODL_ask_2dtrim_bsurf函数实例代码演示：

说明：此文件包含以下外部函数支持bsurface功能：

UF_MODL_ask_bsurfUF_MODL_create_bsurfUF_MODL_edit_bsurf

#include <stdio.h>
#include <stdlib.h>
#include <uf.h>
#include <uf_part.h>
#include <uf_defs.h>
#include <uf_modl.h>
#define UF_CALL(X) (report( __FILE__, __LINE__, #X, (X)))
static int report( char *file, int line, char *call, int irc)
{
  if (irc)
  {
     char    messg[133];
     printf("%s, line %d:  %s\n", file, line, call);
     (UF_get_fail_message(irc, messg)) ?
       printf("    returned a %d\n", irc) :
       printf("    returned error %d:  %s\n", irc, messg);
  }
  return(irc);
}
static void do_ugopen_api(void)
{
  char    *prtnam = "create_bsurf";
  /* Points for B-surface  */
  double points[16][3] = { 3.5, 2.5, 0.0,
			   4.0, 2.6, 0.2,
			   4.5, 2.6, 0.2,
			   5.0, 2.5, 0.0,
			   3.3, 3.0, 0.2,
			   4.1, 3.2, 0.3, 
			   4.5, 3.2, 0.3,
			   5.0, 3.0, 0.2,
			   3.0, 3.5, 0.2,
			   3.8, 3.6, 0.3,
			   4.5, 3.6, 0.3,
			   5.0, 3.5, 0.2,
			   2.6, 4.0, 0.0,
			   3.3, 4.0, 0.2,
			   4.5, 4.0, 0.2,
			   5.0, 4.0, 0.0 };	
  int create_mode = 1;
  int u_closed_status = 0;
  int v_closed_status = 0;
  int u_degree = 3;
  int v_degree = 3;
  int num_rows = 4;
  int pts_per_row[4] = {4, 4, 4, 4};
    
  int ii, jj, kk, indx;
        
  tag_t   part_tag;
  tag_t   bsurf_obj_id = NULL_TAG;
  UF_MODL_bsurf_row_info_t *pts_info_per_row; /* pts info for each row */
  UF_MODL_bsurface_t   bsurf;

  /* Open a new part */
  UF_CALL( UF_PART_new(prtnam, METRIC, &part_tag) );
  pts_info_per_row = ( UF_MODL_bsurf_row_info_t *)malloc( num_rows *
                       sizeof(UF_MODL_bsurf_row_info_t) );
   
  /* allocate and load point and other information for each row of points */
  indx = 0;
  for (ii=0; ii<num_rows; ii++)
  {
    pts_info_per_row[ii].num_points = pts_per_row[ii];  /* can vary */
    pts_info_per_row[ii].points = (double *)malloc( pts_per_row[ii] * 3 *
                                   sizeof(double) );
      
    pts_info_per_row[ii].weight = (double *)malloc( pts_per_row[ii] * 
                                   sizeof(double) );
               
    /* load up point and weight info */
    for (jj=0, kk = 0; kk<pts_per_row[ii]; kk++, jj+=3, indx++)
    {
      pts_info_per_row[ii].points[jj] = points[indx][0];
      pts_info_per_row[ii].points[jj+1] = points[indx][1];
      pts_info_per_row[ii].points[jj+2] = points[indx][2];
      pts_info_per_row[ii].weight[kk] = 1.0;
    
    }
  }
  
  /* create B-surface */
  UF_CALL(UF_MODL_create_bsurf_thru_pts( create_mode, u_closed_status, 
                                         v_closed_status, u_degree, 
                                         v_degree, num_rows, pts_info_per_row,
	                                 &bsurf_obj_id));
	           
  if ( bsurf_obj_id == NULL_TAG )
    printf("*** ERROR CREATING B-SURFACE ***\n");
  /* free allocated memory */
  for (ii=0; ii<num_rows; ii++)
  {
    free(pts_info_per_row[ii].points);
    free(pts_info_per_row[ii].weight);
  }
  
  free(pts_info_per_row);
    
    
  /* ask the B-surface information */
  UF_CALL(UF_MODL_ask_bsurf( bsurf_obj_id, &bsurf ));
  
  /* validate the surface */
  if ( (bsurf.order_u != u_degree+1) || (bsurf.order_v != v_degree+1) )
    printf("*** ERROR ASKING B-SURFACE ***\n");
  
  UF_CALL(UF_MODL_free_bsurf_data(&bsurf));

}
/*ARGSUSED*/
void ufusr(char *param, int *retcode, int param_len)
{
  if (!UF_CALL(UF_initialize()))
  {
    do_ugopen_api();
    UF_CALL(UF_terminate());
  }
}
int ufusr_ask_unload(void)
{
  return (UF_UNLOAD_IMMEDIATELY);
}