private void FindIslands(NavMeshCell cell)
    {
        Color[] colors = new Color[] { Color.red, Color.green, Color.blue, Color.yellow, Color.cyan, Color.magenta };
        int     index  = 0;

        Queue <NavQuad>   nodes        = new Queue <NavQuad>(quadsTolinks.Keys);
        HashSet <NavQuad> visitedNodes = new HashSet <NavQuad>();

        while (nodes.Count > 0)
        {
            var next = nodes.Dequeue();
            if (visitedNodes.Contains(next))
            {
                continue;
            }

            NavigationIsland island = new NavigationIsland(cell);
            islands.Add(island);

            foreach (var node in GraphSearch.BreathFirstSearch(next, GetAdjacentNodesForIslandSearch))
            {
                visitedNodes.Add(node);
                quadsToIslands.Add(node, island);
                int i = index;
            }
            index++;
            index %= colors.Length;
        }
    }