TriangleNet.Mesh.InsertSubseg C# (CSharp) Method

        internal void InsertSubseg(ref Otri tri, int subsegmark)
        {
            Otri oppotri = default(Otri);
            Osub newsubseg = default(Osub);
            Vertex triorg, tridest;

            triorg = tri.Org();
            tridest = tri.Dest();
            // Mark vertices if possible.
            if (triorg.mark == 0)
            {
                triorg.mark = subsegmark;
            }
            if (tridest.mark == 0)
            {
                tridest.mark = subsegmark;
            }
            // Check if there's already a subsegment here.
            tri.SegPivot(ref newsubseg);
            if (newsubseg.seg == dummysub)
            {
                // Make new subsegment and initialize its vertices.
                MakeSegment(ref newsubseg);
                newsubseg.SetOrg(tridest);
                newsubseg.SetDest(triorg);
                newsubseg.SetSegOrg(tridest);
                newsubseg.SetSegDest(triorg);
                // Bond new subsegment to the two triangles it is sandwiched between.
                // Note that the facing triangle 'oppotri' might be equal to 'dummytri'
                // (outer space), but the new subsegment is bonded to it all the same.
                tri.SegBond(ref newsubseg);
                tri.Sym(ref oppotri);
                newsubseg.SymSelf();
                oppotri.SegBond(ref newsubseg);
                newsubseg.seg.boundary = subsegmark;
            }
            else
            {
                if (newsubseg.seg.boundary == 0)
                {
                    newsubseg.seg.boundary = subsegmark;
                }
            }
        }