Isosurface.AdaptiveDualContouring.OctreeNode.ProcessEdge C# (CSharp) Method

        public static void ProcessEdge(OctreeNode[] nodes, int direction, List<int> indexes)
        {
            if (nodes[0] == null || nodes[1] == null || nodes[2] == null || nodes[3] == null)
                return;

            if (nodes[0].type != OctreeNodeType.Internal && nodes[1].type != OctreeNodeType.Internal && nodes[2].type != OctreeNodeType.Internal && nodes[3].type != OctreeNodeType.Internal)
            {
                ProcessIndexes(nodes, direction, indexes);
            }
            else
            {
                for (int i = 0; i < 2; i++)
                {
                    OctreeNode[] edge_nodes = new OctreeNode[4];

                    for (int j = 0; j < 4; j++)
                    {
                        if (nodes[j].type == OctreeNodeType.Leaf || nodes[j].type == OctreeNodeType.Pseudo)
                            edge_nodes[j] = nodes[j];
                        else
                            edge_nodes[j] = nodes[j].children[edgeProcEdgeMask[direction, i, j]];
                    }

                    ProcessEdge(edge_nodes, edgeProcEdgeMask[direction, i, 4], indexes);
                }
            }
        }