api如何求对象最大外形尺寸------我这代码 怎么测的很不准啊

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api如何求对象最大外形尺寸------我这代码 怎么测的很不准啊
char *message="请选择对象:";
  char *title="请选择对象:";
  int  scope=UF_UI_SEL_SCOPE_NO_CHANGE;
  int  response;
  tag_t object_tag;
  double  cursor[3];
  tag_t view;
  UF_UI_select_with_single_dialog(message,title,scope,NULL,NULL,&response,&object_tag,cursor,&view);  //选择框】
  UF_DISP_set_highlight(object_tag,0); //1高亮显示 0不高亮显示
  //UF_OBJ_set_color(object_tag,20);     //改颜色

double  bounding_box[ 6 ];
    UF_MODL_ask_bounding_box (object_tag, bounding_box ); //查询极点坐标 目前测试很不准 问题不断？


  double point_coords_a1[3]={bounding_box[ 1 ],bounding_box[ 2 ],bounding_box[ 3 ]};//点坐标xyz
  double point_coords_a2[3]={bounding_box[ 4 ],bounding_box[ 5 ],bounding_box[ 6 ]};
  tag_t point_tag_a1,point_tag_a2;                     
  UF_CURVE_create_point(point_coords_a1,&point_tag_a1); //调用API创建点
  UF_CURVE_create_point(point_coords_a2,&point_tag_a2);
   
   char box_x_x[22],box_x_y[22],box_x_z[22];
   char box_d_x[22],box_d_y[22],box_d_z[22];
   sprintf(box_x_x, "%d",bounding_box[ 1 ]);      //数字转字符串
   sprintf(box_x_y, "%d",bounding_box[ 2 ]);     
   sprintf(box_x_z, "%d",bounding_box[ 3 ]);     
   sprintf(box_d_x, "%d",bounding_box[ 4 ]);      
   sprintf(box_d_y, "%d",bounding_box[ 5 ]);     
   sprintf(box_d_z, "%d",bounding_box[ 6 ]);   
   UF_UI_open_listing_window(); //打开窗口
   UF_UI_write_listing_window("最小坐标 "); //输入信息
   UF_UI_write_listing_window(box_x_x);
   UF_UI_write_listing_window(",");
   UF_UI_write_listing_window(box_x_y);
   UF_UI_write_listing_window(",");
   UF_UI_write_listing_window(box_x_z);
   UF_UI_write_listing_window("\n");
   UF_UI_write_listing_window("最大坐标 ");
   UF_UI_write_listing_window(box_d_x);
   UF_UI_write_listing_window(",");
   UF_UI_write_listing_window(box_d_y);
   UF_UI_write_listing_window(",");
   UF_UI_write_listing_window(box_d_z);

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