【NX二次开发】获取曲线上某个位置的点坐标、切线矢量、主法线矢量、副法线矢量。UF_MODL_ask_curve_props

效果：

 

 源码：

    tag_t tagCurve = vecObj[0]->Tag();

    double ctol(0.0);
    double atol(0.0);
    double stol(1.0);//步进公差
    int numpts(0);
    tag_t pt_tag(NULL_TAG);

    double *ufPts = NULL;
    UF_MODL_ask_curve_points(tagCurve, ctol, atol, stol, &numpts, &ufPts);
    double adTempPoint[3] = { 0.0,0.0,0.0 };

    for (int i = 0; i < (numpts - 1); i++)
    {
        adTempPoint[0] = ufPts[0 + i * 3];
        adTempPoint[1] = ufPts[1 + i * 3];
        adTempPoint[2] = ufPts[2 + i * 3];

        double curve_point[3] = { 0,0,0 };
        double parm1 = 0;
        UF_MODL_ask_curve_parm(tagCurve, adTempPoint, &parm1, curve_point);

        double face_pnt[3] = { 0,0,0 };
        double tangent[3] = { 0,0,0 }; //切线矢量
        double p_norm[3] = { 0,0,0 }; //主法线
        double b_norm[3] = { 0,0,0 }; //副法线
        double torsion;
        double rad_of_cur;
        UF_MODL_ask_curve_props(tagCurve, parm1, adTempPoint, tangent,
　　　　 p_norm, b_norm, &torsion, &rad_of_cur);

        UF_CURVE_line_t lineP;
        UF_VEC3_copy(adTempPoint, lineP.start_point);
        tag_t tagLine = NULL_TAG;
        double douLenth = 0.0;

        UF_VEC3_unitize(tangent, 1E-6, &douLenth, tangent);
        UF_VEC3_add(lineP.start_point, tangent, lineP.end_point);
        UF_CURVE_create_line(&lineP, &tagLine);
        UF_OBJ_set_color(tagLine, 186);
        
        UF_VEC3_unitize(p_norm, 1E-6, &douLenth, p_norm);
        UF_VEC3_add(lineP.start_point, p_norm, lineP.end_point);
        UF_CURVE_create_line(&lineP, &tagLine);
        UF_OBJ_set_color(tagLine, 108);

        UF_VEC3_unitize(b_norm, 1E-6, &douLenth, b_norm);
        UF_VEC3_add(lineP.start_point, b_norm, lineP.end_point);
        UF_CURVE_create_line(&lineP, &tagLine);
        UF_OBJ_set_color(tagLine, 6);
    }
    UF_free(ufPts);
    UF_terminate();