获取选择的程序刀轨和当前加工坐标系，获取刀轨数据点转换到加工坐标系，然后创建样条，创建样条是用UG录制的代码，有更好的方法欢迎交流学习一下。 

 void CreateCurve()
 {
     tag_t setup_tag;
     UF_SETUP_ask_setup(&setup_tag);
     int count = 0;
     tag_t* objects;
     UF_UI_ONT_ask_selected_nodes(&count, &objects);
     if (count != 1)
     {
         uc1601("选择一个程序或程序组", 1);
         return;
     }
     tag_t initial_wcs;
     tag_t wcs_value;
     logical  is_group = TRUE;
     tag_p_t oprea_list = NULL_TAG;
     UF_CSYS_ask_wcs(&initial_wcs);
     UF_NCGROUP_is_group(objects[0], &is_group);
     if (is_group == TRUE)
     {
         if (count == 0)
         {
             uc1601("程序组为空", 1);
             return;
         }
         UF_NCGROUP_ask_member_list(objects[0], &count, &oprea_list);
         UF_PARAM_ask_tag_value(oprea_list[0], UF_PARAM_MCS, &wcs_value);
     }
     else
     {
         UF_PARAM_ask_tag_value(objects[0], UF_PARAM_MCS, &wcs_value);
     }
     tag_t matrix_tag;
     double origin[3];
     UF_CSYS_ask_csys_info(wcs_value, &matrix_tag, origin);
     UF_CSYS_ask_matrix_values(matrix_tag,Matrix);
     UF_CSYS_set_wcs(wcs_value);
     UF_CAM_preferences_t  number;
     UF_CAM_ask_cam_preferences(&number);
     number.clsf_decimal_place = 5;
     UF_CAM_set_cam_preferences(&number);
     char path_char[133] = "D:\\tmpcls.cls";
     UF_SETUP_generate_clsf(setup_tag, objects[0], "CLSF_STANDARD", path_char, UF_SETUP_OUTPUT_UNITS_OUTPUT_DEFINED);
     FILE* fp = fopen(path_char, "r");
     char fchar[256];
     if (fp == 0)
     {
         uc1601("转换失败", 1);
         return;
     }
     string fbuf;
     int k1 = -1, k2 = -1, k3 = -1, k4 = -1,k5=-1,k6=-1,k7=-1,k8=-1;
     bool isStart = false;
     char msg[256];
     UF_OBJ_ask_name(objects[0],msg);
     vector<Point3d>points;
     while (1)
     {
         
         if (fgets(fchar, 256, fp) == NULL)
         {
             break;
         }
         fbuf = fchar;
         if (strstr(fbuf.c_str(), msg))
         {
             isStart = true;
             points.clear();
             continue;
         } 
         if (!isStart)
         {
             continue;
         }
         
         if (fbuf.compare(0, 4, "GOTO") == 0)
         {
             k1 = k2 = k3 = k4 =k5=k6=k7=k8=-1;
             k1 = fbuf.find('/', 0);
             k2 = fbuf.find(',', k1 + 1);
             k3 = fbuf.find(',', k2 + 1);
             k4 = fbuf.find(',', k3 + 1);
             k5 = fbuf.find(',', k4 + 1);
             k6 = fbuf.find(',', k5 + 1);
             k7 = fbuf.find(',', k6 + 1);
             k8 = fbuf.find(',', k7 + 1);
             double point1[3] = { 0,0,0 };
             double point2[3] = { 0,0,0 };
             point1[0] = atof(fbuf.substr(k1 + 1, k2 - k1 - 1).c_str());
             point1[1] = atof(fbuf.substr(k2 + 1, k3 - k2 - 1).c_str());
             if (k4 == string::npos)
             {
                 point1[2] = atof(fbuf.substr(k3 + 1, fbuf.length()).c_str());
             }
             else
             {
                 point1[2] = atof(fbuf.substr(k3 + 1, k4 - k3 - 1).c_str());
             }
    
             UF_CSYS_map_point(UF_CSYS_ROOT_WCS_COORDS, point1, UF_CSYS_ROOT_COORDS, point1);
             UF_CSYS_map_point(UF_CSYS_ROOT_COORDS, point1, UF_CSYS_WORK_COORDS, point1);
             Point3d point_3d1(point1[0],point1[1],point1[2]);
             points.push_back(point_3d1);
         }
     }
     UF_CSYS_set_wcs(initial_wcs);
     CreateSpline(points);
 }
 
 tag_t  CreateSpline(vector<Point3d>points)
 {
     
     if (Spline_tag!=NULL)
     {
         UF_OBJ_delete_object(Spline_tag);
         Spline_tag = NULL;
     }
     if (points.size() == 0)
     {
         return Spline_tag;
     }
     if (points.size() ==1)
     {
         double point[3] = { points[0].X,points[0].Y,points[1].Z };
         UF_CURVE_create_point(point, &Spline_tag);
         return Spline_tag;
     }
     try
     {
         Session* theSession = Session::GetSession();
         Part* workPart(theSession->Parts()->Work());
         Part* displayPart(theSession->Parts()->Display());

         NXObject* nullNXObject(NULL);


         Features::StudioSplineBuilderEx* studioSplineBuilderEx1;
         studioSplineBuilderEx1 = workPart->Features()->CreateStudioSplineBuilderEx(nullNXObject);

         Point3d origin1(0.0, 0.0, 0.0);
         Vector3d normal1(0.0, 0.0, 1.0);
         Plane* plane1;
         plane1 = workPart->Planes()->CreatePlane(origin1, normal1, SmartObject::UpdateOptionWithinModeling);

         studioSplineBuilderEx1->SetDrawingPlane(plane1);

         Point3d origin2(0.0, 0.0, 0.0);
         Vector3d normal2(0.0, 0.0, 1.0);
         Plane* plane2;
         plane2 = workPart->Planes()->CreatePlane(origin2, normal2, SmartObject::UpdateOptionWithinModeling);

         studioSplineBuilderEx1->SetMovementPlane(plane2);

         studioSplineBuilderEx1->OrientExpress()->SetReferenceOption(GeometricUtilities::OrientXpressBuilder::ReferenceWcsDisplayPart);


         studioSplineBuilderEx1->SetMatchKnotsType(Features::StudioSplineBuilderEx::MatchKnotsTypesNone);

         studioSplineBuilderEx1->OrientExpress()->SetAxisOption(GeometricUtilities::OrientXpressBuilder::AxisPassive);

         studioSplineBuilderEx1->OrientExpress()->SetPlaneOption(GeometricUtilities::OrientXpressBuilder::PlanePassive);
         studioSplineBuilderEx1->SetDegree(1);
         for (int i = 0; i < points.size(); i++)
         {
             Point* point1;
             point1 = workPart->Points()->CreatePoint(points[i]);
             Features::GeometricConstraintData* geometricConstraintData1;
             geometricConstraintData1 = studioSplineBuilderEx1->ConstraintManager()->CreateGeometricConstraintData();
             geometricConstraintData1->SetPoint(point1);
             studioSplineBuilderEx1->ConstraintManager()->Append(geometricConstraintData1);
         }
         NXObject* nXObject1;
         nXObject1 = studioSplineBuilderEx1->Commit();
         studioSplineBuilderEx1->Destroy();
         if (nXObject1)
         {
             Features::Feature* feature1 = dynamic_cast<Features::Feature*>(nXObject1);
             vector<NXObject*>vec = feature1->GetEntities();
             if (!vec.empty())
             {
                 Spline_tag = vec[0]->Tag();
               
             }
         }

         return Spline_tag;
     }
     catch (const std::exception&)
     {
         return Spline_tag;
     }
 }