static void do_ugopen_api(void)
{//例2：创建7条直线形成封闭区域做拉伸操作生成实体
    uf_list_p_t objects,features; char * taper_angle="0.0";char * limit[2]={"10.0","20.0"};double point[3]={0.0,0.0,0.0};              //无效可以不写double direction[ 3 ]={0.0,0.0,1.0};        //拉伸方向UF_FEATURE_SIGN   sign=UF_NULLSIGN;         //布尔运算tag_t object_tag[7];UF_CURVE_line_t line_coords;   line_coords.start_point[0]=0;line_coords.start_point[1]=0;line_coords.start_point[2]=0;line_coords.end_point[0]=10;line_coords.end_point[1]=0;line_coords.end_point[2]=0;UF_CURVE_create_line(&line_coords,&object_tag[0]);line_coords.start_point[0]=0;line_coords.start_point[1]=0;line_coords.start_point[2]=0;line_coords.end_point[0]=0;line_coords.end_point[1]=10;line_coords.end_point[2]=0;UF_CURVE_create_line(&line_coords,&object_tag[1]);line_coords.start_point[0]=0;line_coords.start_point[1]=10;line_coords.start_point[2]=0;line_coords.end_point[0]=10;line_coords.end_point[1]=10;line_coords.end_point[2]=0;UF_CURVE_create_line(&line_coords,&object_tag[2]);line_coords.start_point[0]=10;line_coords.start_point[1]=10;line_coords.start_point[2]=0;line_coords.end_point[0]=10;line_coords.end_point[1]=0;line_coords.end_point[2]=0;UF_CURVE_create_line(&line_coords,&object_tag[3]);line_coords.start_point[0]=2;line_coords.start_point[1]=2;line_coords.start_point[2]=0;line_coords.end_point[0]=5;line_coords.end_point[1]=2;line_coords.end_point[2]=0;UF_CURVE_create_line(&line_coords,&object_tag[4]);line_coords.start_point[0]=5;line_coords.start_point[1]=2;line_coords.start_point[2]=0;line_coords.end_point[0]=2;line_coords.end_point[1]=5;line_coords.end_point[2]=0;UF_CURVE_create_line(&line_coords,&object_tag[5]);line_coords.start_point[0]=2;line_coords.start_point[1]=5;line_coords.start_point[2]=0;line_coords.end_point[0]=2;line_coords.end_point[1]=2;line_coords.end_point[2]=0;UF_CURVE_create_line(&line_coords,&object_tag[6]);// 对象加入到对象列表尾部UF_MODL_create_list(&objects);for (int i=0;i<=6;i++){UF_MODL_put_list_item(objects,object_tag[i]);}UF_MODL_create_extruded (objects, taper_angle,limit, point,direction,sign,&features);//拉伸

}