UG问题：使用UG Open的拉伸函数无法拉伸一个实体

使用UF_MODL_create_extruded 拉伸实体，得不到预想结果，拉伸不出实体
程序如下：

static void do_ugopen_apiNX(void)
{
        double diameter = 50.000000000000;
        double height = 50.000000000000;
        double length = 20.000000000000;
       
        double direction[3] = {0.0,0.0,1.0};//defaut extrude direction--Z axis
        double ref_pt[3] ;
        double arc1_range[2] = {270, 450}, arc_rad = diameter/2;
        double arc2_range[2] = {90, 270 }; //两段圆弧的半径相等
        char *taper_angle = "0.0";         //没有拔模斜度
       
        char *limits[2] = {"0.0", "10.0"} ;   //height > width/2;
        char extrude_length[20] = "";
        _gcvt(height-diameter/2.0, 20, extrude_length);
        //limits[1] = extrude_length;
        uc1601(extrude_length, 1);
       
        int i, count=4;
        tag_t obj_array[5], wcs_tag, matrix_tag;
        uf_list_p_t loop_list, features;
        UF_FEATURE_SIGN create = UF_NULLSIGN ;
       
        UF_CURVE_line_t line1, line2, line3, line4;
        UF_CURVE_arc_t  arc1, arc2;
        //默认在x ， y平面上生成所需要的封闭线，以便拉伸, 即z向为0, 逆时针方向
        //length = 20, diameter = 50.0;
        line1.start_point[0] = length*0.5;   
        line1.start_point[1] = arc_rad;
        line1.start_point[2] =  0.0;
        line1.end_point[0] = -length*0.5;
        line1.end_point[1] = arc_rad;
        line1.end_point[2] = 0.0;

        line2.start_point[0] = line1.end_point[0];
        line2.start_point[1] = line1.end_point[1];
        line2.start_point[2] = line1.end_point[2];
        line2.end_point[0] = line1.end_point[0];
        line2.end_point[1] = -line1.end_point[1];
        line2.end_point[2] = line1.end_point[2];

        line3.start_point[0] = line2.end_point[0];
        line3.start_point[1] = line2.end_point[1];
        line3.start_point[2] = line2.end_point[2];
        line3.end_point[0] = -line2.end_point[0];
        line3.end_point[1] = line2.end_point[1];
        line3.end_point[2] = line2.end_point[2];

        line4.start_point[0] = line3.end_point[0];
        line4.start_point[1] = line3.end_point[1];
        line4.start_point[2] = line3.end_point[2];
        line4.end_point[0] = line1.start_point[0];
        line4.end_point[1] = line1.start_point[1];
        line4.end_point[2] = line1.start_point[2];
       
       
        arc1.start_angle = (PI/180) * arc1_range[0]; arc1.end_angle = (PI/180) * arc1_range[1];
        arc1.arc_center[0] = length/2; arc1.arc_center[1] = arc1.arc_center[2] = 0.0;
        arc1.radius = arc_rad;
       
        arc2.start_angle = (PI/180) * arc2_range[0]; arc2.end_angle = (PI/180) * arc2_range[1];
        arc2.arc_center[0] = -length/2; arc2.arc_center[1] = arc2.arc_center[2] = 0.0;
        arc2.radius = arc_rad;

       
        UF_CALL(UF_CURVE_create_line(&line1, &obj_array[0]));
        UF_CALL(UF_CURVE_create_line(&line2, &obj_array[1]));
        UF_CALL(UF_CURVE_create_line(&line3, &obj_array[2]));
        UF_CALL(UF_CURVE_create_line(&line4, &obj_array[3]));
        /*UF_CALL(UF_CSYS_ask_wcs(&wcs_tag));
        UF_CALL(UF_CSYS_ask_matrix_of_object(wcs_tag, &matrix_tag));
        arc1.matrix_tag = matrix_tag;
        arc2.matrix_tag = matrix_tag;
        UF_CALL(UF_CURVE_create_arc(&arc2, &obj_array[1]));
        UF_CALL(UF_CURVE_create_arc(&arc1, &obj_array[3]));*/
       
        UF_CALL(UF_MODL_create_list(&loop_list));
       
        for(i = 0; i < count; i++) {
                UF_CALL(UF_MODL_put_list_item(loop_list, obj_array[i]));
        }
        UF_CALL(UF_MODL_create_extruded(loop_list, taper_angle, limits, ref_pt, direction, create, &features));
}

你如果真想解决，请将整个工程文件发给我，我帮你处理一下。
glgao@tkmold.com