NX获取包围盒大小

1.情景：CAM环境下，需要得到当前零件在加工坐标系下的X、 Y、 Z方向上的极值。

2.百度上找到了三个函数：

AskBoundingBox、AskBoundingBoxAligned、AskBoundingBoxExact

后三个可以指定参照坐标系，我自己测试了一下，发现出来的结果总是在绝对坐标系下的结果，最后还是得自己处理下才得到，记录一下。

        Session theSession = Session.GetSession();
        NXOpen.Part workPart = theSession.Parts.Work;

        bool expand = true;
        double[] min_corner = new double[3]; //角落点
        double[,] directions = new double[3, 3];//方向
        double[] distances = new double[3];//xyz最大距离

        double[] outlinePoint = new double[6];

        TaggedObject obj = partSel.GetSelectedObjects()[0];//partSel是一个选择控件，得到的obj是需要计算包围盒的目标零件

        //方法一：
        NXOpen.UF.UFSession.GetUFSession().Modl.AskBoundingBox(tag.Tag, outlinePoint);

        // 获取的outlinePoint再使用向量的点乘即可转换成在目标坐标系下的坐标

 

 

        //下面的sys是参照的坐标系，如何获取？见后面的函数

        //方法二：

        //NXOpen.UF.UFSession.GetUFSession().Modl.AskBoundingBoxAligned(tag.Tag, sys.Tag, expand, min_corner, directions, distances);

        //方法三：
        //NXOpen.UF.UFSession.GetUFSession().Modl.AskBoundingBoxExact(tag.Tag, sys.Tag, min_corner, directions, distances);

 

 

    //获取当前的全部几何体（加工坐标系）

    void GetAllMcs(ref List<NXOpen.CAM.OrientGeometry> mcs)
    {
        Session theSession = Session.GetSession();
        NXOpen.Part workPart = theSession.Parts.Work;
        NXOpen.CAM.CAMSession camSession = theSession.CAMSession;
        NXOpen.CAM.CAMSetup camSetup = workPart.CAMSetup;
        NXOpen.CAM.NCGroup ncGroup = camSetup.GetRoot(NXOpen.CAM.CAMSetup.View.Geometry);
        List<NXOpen.CAM.OrientGeometry> mcs = new List<NXOpen.CAM.OrientGeometry> ();
        GetMcs(ncGroup, ref mcs);

    }

 

    void GetMcs(NXOpen.CAM.CAMObject camObj,ref List<NXOpen.CAM.OrientGeometry> mcs)
    {
        if (camObj is NXOpen.CAM.OrientGeometry)
        {
            NXOpen.CAM.OrientGeometry system = camObj as NXOpen.CAM.OrientGeometry;
            mcs.Add(system);
        }
        if (camObj is NXOpen.CAM.NCGroup)
        {
            NXOpen.CAM.NCGroup ncGroup = camObj as NXOpen.CAM.NCGroup;
            NXOpen.CAM.CAMObject[] camObjArr = ncGroup.GetMembers();
            foreach (NXOpen.CAM.CAMObject icamObj in camObjArr)
            {
                GetMcs(icamObj,ref mcs);
            }
        }
    }

 

        // 另外，从几何体中获取加工坐标系

        NXOpen.CAM.MillOrientGeomBuilder millOrientGeomBuilder1 = workPart.CAMSetup.CAMGroupCollection.CreateMillOrientGeomBuilder(mcs[0]);
        CoordinateSystem curSys = millOrientGeomBuilder1.Mcs;
        millOrientGeomBuilder1.Destroy();