这个是在UG二次开发CAM模块中需要用到的功能，根据驱动曲面的uv参数，生成8个临时的箭头以表示加工方向，以圆标识选中的箭头。
//根据曲面的uv参数，设置8个方向
double[] point1 = new double[3];
double[] u11 = new double[3];
double[] v11 = new double[3];
double[] u21 = new double[3];
double[] v21 = new double[3];
double[] unitNorm = new double[3];
double[] radii = new double[2];
double[] paramters = new double[2] { 0.05, 0.05 };
uFModl.AskFaceProps(driverSurface.Tag, paramters, point1, u11, v11, u21, v21, unitNorm, radii);
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point1, u11, 0, "1");
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point1, v11, 0, "2");
double[] point2 = new double[3];
double[] u12 = new double[3];
double[] v12 = new double[3];
double[] u22 = new double[3];
double[] v22 = new double[3];
paramters = new double[2] { 0.05, 0.95 };
uFModl.AskFaceProps(driverSurface.Tag, paramters, point2, u12, v12, u22, v22, unitNorm, radii);
v12 = new double[3] { -1.0 * v12[0], -1.0 * v12[1], -1.0 * v12[2] };
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point2, v12, 0, "3");
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point2, u12, 0, "4");
double[] point3 = new double[3];
double[] u13 = new double[3];
double[] v13 = new double[3];
double[] u23 = new double[3];
double[] v23 = new double[3];
paramters = new double[2] { 0.95, 0.95 };
uFModl.AskFaceProps(driverSurface.Tag, paramters, point3, u13, v13, u23, v23, unitNorm, radii);
u13 = new double[3] { -1.0 * u13[0], -1.0 * u13[1], -1.0 * u13[2] };
v13 = new double[3] { -1.0 * v13[0], -1.0 * v13[1], -1.0 * v13[2] };
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point3, u13, 0, "5");
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point3, v13, 0, "6");
double[] point4 = new double[3];
double[] u14 = new double[3];
double[] v14 = new double[3];
double[] u24 = new double[3];
double[] v24 = new double[3];
paramters = new double[2] { 0.95, 0.05 };
uFModl.AskFaceProps(driverSurface.Tag, paramters, point4, u14, v14, u24, v24, unitNorm, radii);
u14 = new double[3] { -1.0 * u14[0], -1.0 * u14[1], -1.0 * u14[2] };
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point4, v14, 0, "7");
uFDisp.LabeledConehead(UFConstants.UF_DISP_ALL_ACTIVE_VIEWS, point4, u14, 0, "8");
//选择加工方向
string message = "选择加工方向";
int num = 8;
double[] origins = new double[24] { point1[0],point1[1],point1[2], point1[0], point1[1], point1[2] ,
point2[0],point2[1],point2[2], point2[0],point2[1],point2[2],
point3[0],point3[1],point3[2], point3[0],point3[1],point3[2],
point4[0],point4[1],point4[2], point4[0],point4[1],point4[2]};
double[] directions = new double[24] {u11[0],u11[1],u11[2], v11[0], v11[1], v11[2] ,
v12[0],v12[1],v12[2], u12[0], u12[1], u12[2],
u13[0],u13[1],u13[2], v13[0], v13[1], v13[2] ,
v14[0],v14[1],v14[2], u14[0], u14[1], u14[2]};
string[] labels = new string[8] { "1", "2", "3", "4", "5", "6", "7", "8" };
UFDisp.ConeheadAttrbSTag[] attributes = new UFDisp.ConeheadAttrbSTag[8];
for (int i = 0; i < 8; i++)
{
attributes[i].cone_radius = 0.075;
attributes[i].total_length = 1.0;
attributes[i].staff_length = 1.0;
attributes[i].color = 0;
attributes[i].font = 1;
attributes[i].density = 1;
}
double selection_point = 0.5;
int display_coneheads = UFConstants.UF_UI_DISP_SELECTED;
int response;
int cuttingDirectionNew = 0;
theUFUi.SelectConehead(message, num, origins, directions, labels, attributes, selection_point, display_coneheads, out cuttingDirectionNew, out response);
if(cuttingDirectionNew>=1&cuttingDirectionNew<=8)
{
cuttingDirection = cuttingDirectionNew;
}其主要的函数是UFUI.SelectConehead()。
double []origion = new double[24]，指的是8个方向的点数据，{x1,y1,z1,x2,y2,z2,x3,y3,z3...}；
double []direction = new double[24]，指的是8个方向的矢量数据.
string []lables = new string[8]，指的是8个方向箭头上的标识
UFDisp.ConeheadAttrbSTag[] attributes = new UFDisp.ConeheadAttrbSTag[8]; 是8个箭头的属性，可以设置相同的，也可以设置成不一样的。
最终的输出是选中的方向索引值
如果用C++，即UG OPEN，其代码如下：
tMachArea = tag_MachObject;
double point1[3];
double u11[3];
double v11[3];
double u21[3];
double v21[3];
param[1]=param[0]=0.05;
UF_MODL_ask_face_props(tMachArea, param, point1, u11, v11, u21, v21, unit_norm, radii);
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point1, u11, 0, "1");
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point1, v11, 0, "2");
double point2[3];
double u12[3];
double v12[3];
double u22[3];
double v22[3];
param[0]=0.05; param[1]=0.95;
UF_MODL_ask_face_props(tMachArea, param, point2, u12, v12, u22, v22, unit_norm, radii);
v12[0]=-v12[0]; v12[1]=-v12[1]; v12[2]=-v12[2];
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point2, v12, 0, "3");
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point2, u12, 0, "4");
double point3[3];
double u13[3];
double v13[3];
double u23[3];
double v23[3];
param[0]=0.95; param[1]=0.95;
UF_MODL_ask_face_props(tMachArea, param, point3, u13, v13, u23, v23, unit_norm, radii);
u13[0]=-u13[0]; u13[1]=-u13[1]; u13[2]=-u13[2];
v13[0]=-v13[0]; v13[1]=-v13[1]; v13[2]=-v13[2];
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point3, u13, 0, "5");
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point3, v13, 0, "6");
double point4[3];
double u14[3];
double v14[3];
double u24[3];
double v24[3];
param[0]=0.95; param[1]=0.05;
UF_MODL_ask_face_props(tMachArea, param, point4, u14, v14, u24, v24, unit_norm, radii);
u14[0]=-u14[0]; u14[1]=-u14[1]; u14[2]=-u14[2];
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point4, v14, 0, "7");
UF_DISP_labeled_conehead(UF_DISP_ALL_ACTIVE_VIEWS, point4, u14, 0, "8");
char message[] = "选择加工方向";
int num = 8;
double origins[24] = {point1[0],point1[1],point1[2],point1[0],point1[1],point1[2],
point2[0],point2[1],point2[2],point2[0],point2[1],point2[2],
point3[0],point3[1],point3[2],point3[0],point3[1],point3[2],
point4[0],point4[1],point4[2],point4[0],point4[1],point4[2]};
double directions[24] = {u11[0],u11[1],u11[2],v11[0],v11[1],v11[2],
v12[0],v12[1],v12[2],u12[0],u12[1],u12[2],
u13[0],u13[1],u13[2],v13[0],v13[1],v13[2],
v14[0],v14[1],v14[2],u14[0],u14[1],u14[2]};
char *st[8] = {"1","2","3","4","5","6","7","8"};
char **labels = st;
UF_DISP_conehead_attrb_s_tag attributes[8] ;
for (int i=0;i<8;i++)
{
attributes[i].density = 1;
attributes[i].color = 0;
attributes[i].cone_radius = 0.075;
attributes[i].total_length = 1.0;
attributes[i].font = 1;
attributes[i].staff_length = 0.6;
}
double selectPoint = 0.5;
int display_coneheads = UF_UI_DISP_SELECTED;
int response;
int cuttingDirectionNew = 0;
UF_UI_select_conehead(message,num,origins,directions,labels,attributes,selectPoint,display_coneheads,&cuttingDirectionNew,&response);
if (cuttingDirectionNew>0&&cuttingDirectionNew<9)
{
in_MachDirection = cuttingDirectionNew;
}