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函数说明：
如有查询邻接到指定面的指定边缘小面。 如果没有相邻然后指定的小面边缘面UF_FACET_NULL_FACET_ID在adjacent_facet_id返回，edge_id_in_adjacent_facet的内容是不确定的。

函数参数：
第1个参数为输入：
model代表参数变量，tag_t 为输入参数类型，该模型

第2个参数为输入：
输入int 整数型的参数，参数的变量格式为facet_id，小面的ID。

第3个参数为输入：
输入int 整数型的参数，参数的变量格式为edge_id，其中相邻的面被询问的边缘。

第4个参数为输出：
输出int * 整数型的参数，参数的变量格式为adjacent_facet_id，相邻面

第5个参数为输出：
输出int * 整数型的参数，参数的变量格式为edge_id_in_adjacent_facet，在相邻的小面是相邻于facet_id到edge_id边缘。

UF_FACET_ask_adjacent_facet函数实例代码演示：
这个示例程序创建一个四面体的面模型。 它然后检查模型中的边缘的邻接和凸。最后，它会从四面体一个方面，并增加了另一三个方面的顶点，其中在四面体的内部向上推使得有在所得模型三凹边。 它即可查询并打印所有模型边缘的凸度。
[quote]
#include <stdio.h>
#include <uf.h>
#include <uf_modl.h>
#include <uf_assem.h>
#include <uf_facet.h>
/*--------------------------------------------------------------*/
/*ARGSUSED*/
extern void ufusr( char *param, int *retcod, int param_len )
{
UF_initialize();
*retcod = example2();
UF_terminate();
}
/*--------------------------------------------------------------*/
static int example2( void )
{
int ifail;
tag_t part_tag;
int i;
tag_t new_model;
double facet_vertices[30][3];
double facet_normals[30][3];
int adjacencies[30];
int facets[7];
int edge;
int adjacent_facets[3];
int facet_id;
int edge_in_adjacent_facet;
int num_facets_in_model;
logical model_convexity;
/*
First create a part in which we will initially create a
block.
*/
ifail = UF_PART_new( "uf_facet_exp2_test_part",
1 /* MM */,
&part_tag ); /* 1 = mm */
if ( ifail != 0 )
{
printf( "**ERR: Failed to create new part ifail %d\n",
ifail );
return 1;
}
ifail = UF_ASSEM_set_work_part( part_tag );
UF_FACET_create_model( part_tag, &new_model );
facet_vertices[0][0] = 0.0;
facet_vertices[0][1] = 0.0;
facet_vertices[0][2] = 0.0;

facet_vertices[1][0] = 0.03;
facet_vertices[1][1] = 0.05;
facet_vertices[1][2] = 0.0;
facet_vertices[2][0] = 0.060;
facet_vertices[2][1] = 0.0;
facet_vertices[2][2] = 0.0;
adjacencies[0] = UF_FACET_NULL_FACET_ID;
adjacencies[1] = UF_FACET_NULL_FACET_ID;
adjacencies[2] = UF_FACET_NULL_FACET_ID;
UF_FACET_add_facet_to_model( new_model,
3,
facet_vertices,
NULL,
adjacencies,
facets+0 );
facet_vertices[0][0] = 0.0;
facet_vertices[0][1] = 0.0;
facet_vertices[0][2] = 0.0;

facet_vertices[1][0] = 0.060;
facet_vertices[1][1] = 0.0;
facet_vertices[1][2] = 0.0;
facet_vertices[2][0] = 0.03;
facet_vertices[2][1] = 0.03;
facet_vertices[2][2] = 0.05;
adjacencies[0] = facets[0];
UF_FACET_add_facet_to_model( new_model,
3,
facet_vertices,
NULL,
adjacencies,
facets+1 );
facet_vertices[0][0] = 0.060;
facet_vertices[0][1] = 0.0;
facet_vertices[0][2] = 0.0;
facet_vertices[1][0] = 0.03;
facet_vertices[1][1] = 0.05;
facet_vertices[1][2] = 0.0;
facet_vertices[2][0] = 0.03;
facet_vertices[2][1] = 0.03;
facet_vertices[2][2] = 0.05;
adjacencies[0] = facets[0];
adjacencies[1] = UF_FACET_NULL_FACET_ID;
adjacencies[2] = facets[1];
UF_FACET_add_facet_to_model( new_model,
3,
facet_vertices,
NULL,
adjacencies,
facets+2 );
facet_vertices[0][0] = 0.03;
facet_vertices[0][1] = 0.05;
facet_vertices[0][2] = 0.0;
facet_vertices[1][0] = 0.0;
facet_vertices[1][1] = 0.0;
facet_vertices[1][2] = 0.0;

facet_vertices[2][0] = 0.03;
facet_vertices[2][1] = 0.03;
facet_vertices[2][2] = 0.05;
adjacencies[0] = facets[0];
adjacencies[1] = facets[1];
adjacencies[2] = facets[2];
UF_FACET_add_facet_to_model( new_model,
3,
facet_vertices,
NULL,
adjacencies,
facets+3 );
facet_id = UF_FACET_NULL_FACET_ID;
UF_FACET_cycle_facets( new_model, &facet_id );
while ( facet_id != UF_FACET_NULL_FACET_ID )
{
for ( edge = 0; edge < 3; edge++ )
{
UF_FACET_ask_adjacent_facet( new_model,
facet_id,
edge,
&adjacent_facets[edge],
&edge_in_adjacent_facet );
}
printf( "facet index: %d\n", facet_id );

printf( "\tadjacent_facets: [%d,%d,%d]\n",
adjacent_facets[0],
adjacent_facets[1],
adjacent_facets[2] );
UF_FACET_cycle_facets( new_model, &facet_id );
}
UF_FACET_is_model_convex( new_model, &model_convexity );
printf( "Model %s convex\n",
(model_convexity) ? "IS" : "IS NOT" );
/*
Now create a facet topology containing some concave
edges, to get this delete the first facet in the tetrahedron
and replace it with three facets the shared vertex of which
is towards the top vertex of the tetrahedron.
*/
UF_FACET_del_facet_from_model( new_model, facets[0] );
facet_vertices[0][0] = 0.060;
facet_vertices[0][1] = 0.0;
facet_vertices[0][2] = 0.0;
facet_vertices[1][0] = 0.0;
facet_vertices[1][1] = 0.0;
facet_vertices[1][2] = 0.0;
facet_vertices[2][0] = 0.02;
facet_vertices[2][1] = 0.02;
facet_vertices[2][2] = 0.01;
adjacencies[0] = facets[1];
adjacencies[1] = UF_FACET_NULL_FACET_ID;
adjacencies[2] = UF_FACET_NULL_FACET_ID;
UF_FACET_add_facet_to_model( new_model,
3,
facet_vertices,
NULL,
adjacencies,
facets+5 );
facet_vertices[0][0] = 0.03;
facet_vertices[0][1] = 0.05;
facet_vertices[0][2] = 0.0;
facet_vertices[1][0] = 0.060;
facet_vertices[1][1] = 0.0;
facet_vertices[1][2] = 0.0;
facet_vertices[2][0] = 0.02;
facet_vertices[2][1] = 0.02;
facet_vertices[2][2] = 0.01;
adjacencies[0] = facets[2];
adjacencies[1] = facets[5];
adjacencies[2] = UF_FACET_NULL_FACET_ID;
UF_FACET_add_facet_to_model( new_model,
3,
facet_vertices,
NULL,
adjacencies,
facets+6 );
facet_vertices[0][0] = 0.0;
facet_vertices[0][1] = 0.0;
facet_vertices[0][2] = 0.0;

facet_vertices[1][0] = 0.03;
facet_vertices[1][1] = 0.05;
facet_vertices[1][2] = 0.0;
facet_vertices[2][0] = 0.02;
facet_vertices[2][1] = 0.02;
facet_vertices[2][2] = 0.01;
adjacencies[0] = facets[3];
adjacencies[1] = facets[6];
adjacencies[2] = facets[5];
UF_FACET_add_facet_to_model( new_model,
3,
facet_vertices,
NULL,
adjacencies,
facets+7 );
UF_FACET_model_edits_done( new_model );
/*
Now look at the edge convexity again.
*/
printf( "Edge convexity for %u\n", new_model );
facet_id = UF_FACET_NULL_FACET_ID;
UF_FACET_cycle_facets( new_model, &facet_id );
while ( facet_id != UF_FACET_NULL_FACET_ID )
{
int verts_in_facet;
UF_FACET_ask_num_verts_in_facet( new_model,
facet_id,
&verts_in_facet );
/*
For each vertex print the vertex coordinates and the
vertex normal.
*/
UF_FACET_ask_vertices_of_facet( new_model,
facet_id,
&verts_in_facet,
facet_vertices );
UF_FACET_ask_normals_of_facet( new_model,
facet_id,
&verts_in_facet,
facet_normals );
for ( i=0 ; i < verts_in_facet ; i++ )
{
printf( " Vertex %d: (%g, %g, %g)\n",
i, facet_vertices[i][0],
facet_vertices[i][1],
facet_vertices[i][2] );
printf( " Normal %d (%g, %g, %g)\n",
i, facet_normals[i][0],
facet_normals[i][1],
facet_normals[i][2] );
}
for ( i=0 ; i < verts_in_facet ; i++ )
{
int convexity;
UF_FACET_ask_edge_convexity( new_model,
facet_id,
i,
&convexity );
printf( " Facet %d: Edge %d: %s\n", facet_id, i,
(convexity == UF_FACET_IS_CONVEX) ?
"IS CONVEX" :
(convexity == UF_FACET_IS_CONCAVE) ?
"IS CONCAVE" :
"CONVEXITY IS NOT DETERMINED"
);
/*
Now check that the convexity of the corresponding
edge in the adjacent facet is consistent.
*/
{
int adjacent_facet_id;
int adj_convexity;
UF_FACET_ask_adjacent_facet( new_model,
facet_id,
i,
&adjacent_facet_id,
&edge_in_adjacent_facet
);

UF_FACET_ask_edge_convexity( new_model,
adjacent_facet_id,
edge_in_adjacent_facet,
&adj_convexity );
if ( convexity != adj_convexity )
{
printf( " **ERR: Edge convexity wrong\n" );
}
}
}
UF_FACET_cycle_facets( new_model, &facet_id );
}
UF_FACET_ask_n_facets_in_model(new_model, &num_facets_in_model);
printf( "There are %d facets in the final model\n",
num_facets_in_model );
UF_FACET_is_model_convex( new_model, &model_convexity );
printf( "Model %s convex\n",
(model_convexity) ? "IS" : "IS NOT" );
return 0;
}

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