再问曲面面积：现在有了函数，可为什么得不到我要的结果呢？

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以前连求曲面面积的函数都不知道，现在知道了，是UF_MODL_ask_mass_props_3d，看了那个例子后可以求一个实体的面积了，但是我想求曲面得面积，可怎么也做不到，问题到底出在哪里呢？请求高手指教，下面是我在例子的基础上写的程序，只做了一点点改动，但是结果却出现巨大差异。
extern "C" DllExport void ufusr( char *parm, int *returnCode, int rlen )
{int irc = 0;
char *message = "Select Object";
UF_UI_selection_options_t opts;
UF_UI_mask_t mask;
int response;
  
tag_t *object;
  
int unhighlight=0;
char buffer[133];
char error[133];
    /* Initialize the API environment */
    int errorCode = UF_initialize();
  
    if ( 0 == errorCode )
    {
        /* TODO: Add your application code here */
opts.other_options = 0;
opts.reserved = NULL;
opts.num_mask_triples = 1;
opts.mask_triples = [$mask]
/* set up selectable type, subtype, solid type */
opts.mask_triples->object_type = UF_solid_type;
opts.mask_triples->object_subtype = UF_solid_face_subtype;
opts.mask_triples->solid_type = UF_UI_SEL_FEATURE_ANY_FACE;
/* set selection scope to be work part */
opts.scope = UF_UI_SEL_SCOPE_WORK_PART;
  
  int type = 2;
  int  unit = 3;
  int accuracy =  1;
  int  count = 0;
  
  int  i;
  double  acc_val[11] = {1,0,0,0,0,0,0,0,0,0,0};
  double  density = 1.0;
  double  massprop[47];
  double  massprop_stat[13];
  
irc = UF_UI_select_by_class(message,&opts,&response,
                                    [$count,&object)]
  
/* if no error, print information about selected object */
if (!irc)
{UF_UI_open_listing_window();
sprintf(buffer,"response= %d, object tag= %d", response, object);
  UF_UI_write_listing_window(buffer);
UF_MODL_ask_mass_props_3d(object,
                                       count,
                                       type,
                                       unit,
                                       density,
                                       accuracy,
                                       acc_val,
                                       massprop,
                                       massprop_stat);
  
for (i=0; i<47; i++)
     {
       sprintf(buffer,"[%d] = %f\n",i,massprop);
     UF_UI_write_listing_window(buffer);
}
    
for(i=0;i<count;i++)
  /* unhighlight selected object */
{UF_DISP_set_highlight(object,unhighlight);  
}
UF_free(object);
}
else  /* else get error message */
{
  UF_get_fail_message(irc,error);
  sprintf(buffer,"ERROR: %s\n",error);
UF_UI_write_listing_window(buffer);
}
  
        /* Terminate the API environment */
        errorCode = UF_terminate();
    }
但是如果把opts.mask_triples->object_type = UF_solid_type;
opts.mask_triples->object_subtype = UF_solid_face_subtype;
opts.mask_triples->solid_type = UF_UI_SEL_FEATURE_ANY_FACE;进行一下变动就可以求实体的面积了
opts.mask_triples->object_type = UF_solid_type;
opts.mask_triples->object_subtype = 0;
opts.mask_triples->solid_type = UF_UI_SEL_FEATURE_BODY;
比较罗索，但是还是邀请高手们帮忙看一下，自己实在不知道怎么去改才可以。我的目的只想求某一个曲面得面积，而非实体的。先谢谢了！

thriller

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深夜摔键盘

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jjf1120

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