public void Apply(DMesh3 mesh)
        {
            int NV = AddedV.size;

            if (NV > 0)
            {
                NewVertexInfo vinfo = new NewVertexInfo(Positions[0]);
                mesh.BeginUnsafeVerticesInsert();
                for (int i = 0; i < NV; ++i)
                {
                    int vid = AddedV[i];
                    vinfo.v = Positions[i];
                    if (Normals != null)
                    {
                        vinfo.bHaveN = true; vinfo.n = Normals[i];
                    }
                    if (Colors != null)
                    {
                        vinfo.bHaveC = true; vinfo.c = Colors[i];
                    }
                    if (UVs != null)
                    {
                        vinfo.bHaveUV = true; vinfo.uv = UVs[i];
                    }
                    MeshResult result = mesh.InsertVertex(vid, ref vinfo, true);
                    if (result != MeshResult.Ok)
                    {
                        throw new Exception("AddTrianglesMeshChange.Revert: error in InsertVertex(" + vid.ToString() + "): " + result.ToString());
                    }
                }
                mesh.EndUnsafeVerticesInsert();
            }

            int NT = AddedT.size;

            if (NT > 0)
            {
                mesh.BeginUnsafeTrianglesInsert();
                for (int i = 0; i < NT; ++i)
                {
                    int        tid    = AddedT[i];
                    Index4i    tdata  = Triangles[i];
                    Index3i    tri    = new Index3i(tdata.a, tdata.b, tdata.c);
                    MeshResult result = mesh.InsertTriangle(tid, tri, tdata.d, true);
                    if (result != MeshResult.Ok)
                    {
                        throw new Exception("AddTrianglesMeshChange.Revert: error in InsertTriangle(" + tid.ToString() + "): " + result.ToString());
                    }
                }
                mesh.EndUnsafeTrianglesInsert();
            }

            if (OnApplyF != null)
            {
                OnApplyF(AddedV, AddedT);
            }
        }