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函数说明：
创建由指定的定义给定的脸部曲线，平衡线方向和角度。

函数参数：
第1个参数为输入：
face_id代表参数变量，tag_t 为输入参数类型，面部识别

第2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direction [ 3 ]，平衡线方向（标准化的矢量）

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angle，平衡线角以度（指定方向和曲线的法线之间）。角度范围是从-90到+90度。

第4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dist_tol，公差值。当输入面是外来的或是非解析面的偏移的公差只使用。

第5个参数为输出：
isocurve_id代表参数变量，tag_t * * 为输出参数类型，平衡线曲线对象标识符的数组。分配的数组必须与UF_free被释放（）。

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isocurve_cnt，创建曲线数量。

UF_MODL_create_isocline_curves函数实例代码演示：
执行此示例代码之前，必须打开一个空白部分。该代码创建在图中所示的表面和平衡线曲线。该角度在5度的增量递增，从30 90度。
[quote]
#include <stdio.h>
#include <uf_modl.h>
#include <uf.h>
#include <uf_ui.h>
#define TOL 0.001
#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)
{
/* B-surface parameters */
double pole1[272] = {-3.033042,-9.000000,0.641636,1.000000,
-2.819874,-9.000000,0.919637,1.000000,
-2.435243,-9.000000,1.275825,1.000000,
-1.807612,-9.000000,1.395713,1.000000,
-1.354613,-9.000000,0.937392,1.000000,
-1.044966,-9.000000,0.571565,1.000000,
-0.883241,-9.000000,0.452738,1.000000,
-0.651919,-9.000000,0.385723,1.000000,
-0.340421,-9.000000,0.596172,1.000000,
-0.036815,-9.000000,0.757535,1.000000,
0.182856,-9.000000,0.617462,1.000000,
0.334729,-9.000000,0.437994,1.000000,
0.629579,-9.000000,-0.040704,1.000000,
1.123166,-9.000000,-0.482252,1.000000,
1.950353,-9.000000,0.115269,1.000000,
2.504707,-9.000000,0.916548,1.000000,
2.824460,-9.000000,1.481816,1.000000,
-2.986289,-5.925315,-5.782342,1.000000,
-2.987650,-5.925315,-5.206033,1.000000,
-2.954141,-5.925315,-4.065211,1.000000,
-2.759453,-5.925315,-1.921877,1.000000,
-2.399153,-5.925315,-0.123032,1.000000,
-1.984206,-5.925315,0.911653,1.000000,
-1.725177,-5.925315,1.312445,1.000000,
-1.317304,-5.925315,1.720948,1.000000,
-0.635971,-5.925315,1.757500,1.000000,
0.132939,-5.925315,1.697968,1.000000,
0.672025,-5.925315,1.961864,1.000000,
1.038267,-5.925315,2.245758,1.000000,
1.686029,-5.925315,3.001513,1.000000,
2.372259,-5.925315,4.176731,1.000000,
2.867826,-5.925315,5.127934,1.000000,
3.029237,-5.925315,5.439132,1.000000,
3.082648,-5.925315,5.531233,1.000000,
-2.919238,-3.081835,7.699265,1.000000,
-2.711035,-3.081835,6.978883,1.000000,
-2.325208,-3.081835,5.657372,1.000000,
-1.661236,-3.081835,3.472273,1.000000,
-1.136837,-3.081835,1.945551,1.000000,
-0.761729,-3.081835,1.135099,1.000000,
-0.565783,-3.081835,0.815819,1.000000,
-0.287779,-3.081835,0.471250,1.000000,
0.076189,-3.081835,0.361157,1.000000,
0.399688,-3.081835,0.324798,1.000000,
0.617050,-3.081835,0.091020,1.000000,
0.763465,-3.081835,-0.138356,1.000000,
1.030631,-3.081835,-0.741188,1.000000,
1.400327,-3.081835,-1.862081,1.000000,
1.911997,-3.081835,-3.368024,1.000000,
2.228114,-3.081835,-4.241339,1.000000,
2.404480,-3.081835,-4.706095,1.000000,
-2.898459,0.000000,-0.016719,1.000000,
-2.820424,0.000000,-0.004876,1.000000,
-2.653031,0.000000,0.011669,1.000000,
-2.277420,0.000000,0.020703,1.000000,
-1.847267,0.000000,0.000414,1.000000,
-1.434876,0.000000,-0.031169,1.000000,
-1.190609,0.000000,-0.051477,1.000000,
-0.816433,0.000000,-0.083356,1.000000,
-0.229142,0.000000,-0.133318,1.000000,
0.379704,0.000000,-0.166430,1.000000,
0.786214,0.000000,-0.173034,1.000000,
1.056826,0.000000,-0.172748,1.000000,
1.527896,0.000000,-0.158462,1.000000,
2.053852,0.000000,-0.103863,1.000000,
2.554006,0.000000,0.002525,1.000000,
2.793251,0.000000,0.075236,1.000000,
2.909607,0.000000,0.117034,1.000000};
double u_knot[21] = {0.000000,0.000000,0.000000,
0.000000,0.062500,0.125000,
0.250000,0.312500,0.343750,
0.375000,0.500000,0.625000,
0.656250,0.687500,0.750000,
0.875000,0.937500,1.000000,
1.000000,1.000000,1.000000};
double v_knot[8] = {0.000000,0.000000,0.000000,0.000000,
1.000000,1.000000,1.000000,1.000000};
/* Isocline parameters */
double direction[3] = {0.0,0.0,1.0};
double angle = 30.0;
double dist_tol = TOL;
/* Text buffers for error messages */
char message[133], buffer[133];

/* B-surface parameters */
int num_pole_u = 17;
int num_pole_v = 4;
int u_ord = 4;
int v_ord = 4;
int knot1_fix;
int pole1_fix;
int total_iso_curves;
/* Error parameter */
int err;
/* Count of isocline curves created */
int isocurve_cnt;
tag_t bsurf;
tag_t *isocurve;
/* Open Motif Window for messages */
UF_UI_open_listing_window();
/* Create B-surface */
UF_CALL(UF_MODL_create_bsurf(num_pole_u,num_pole_v,u_ord,
v_ord,u_knot,v_knot,pole1,&bsurf,&knot1_fix,&pole1_fix));

/* Create isocline curves */
total_iso_curves = 0;
while(angle <= 90.0) {
err = UF_MODL_create_isocline_curves(bsurf,direction,angle,
dist_tol,&isocurve,&isocurve_cnt);
if(err){
UF_get_fail_message(err,message);
sprintf(buffer,
"\nError num %d in
UF_MODL_create_isocline_curves:\n",err);
UF_UI_write_listing_window(buffer);
UF_UI_write_listing_window(message);
}
else {
total_iso_curves += isocurve_cnt;
}
angle += 5.0;
}
/* Write the number of created curves to the window */
sprintf(buffer,"\nThe number of curves is: %d",total_iso_curves);
UF_UI_write_listing_window(buffer);
/* Deallocate memory */
UF_free(isocurve);
}
/*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);
}

[/quote]