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private class TextureDownloader
    {
        public WWW www;
        public string url;
        public Texture2D tex;
        public string atlasName;
    }
   
    IEnumerator _UpdateAtlas(List<TextureDownloader> texIndex)
    {
        Debug.Log(Helpers.TimeStamp() + "Begin updating atlases");
        yield return 0; //why this?
 
        //get the unique atlas names
        TextureDownloader[] uniqueAtlasNames = texIndex.GroupBy(x => x.atlasName)
                                       .Select(g => g.First())
                                       .ToArray();
        Debug.Log(Helpers.TimeStamp() + "There are " + uniqueAtlasNames.Count() + " atlases in the queue");
        for (int i = 0; i < uniqueAtlasNames.Count(); i++)
        {
            string thisAtlasName = uniqueAtlasNames[i].atlasName;
            
            //all items that are associated with this atlas
            TextureDownloader[] thisAtlasurls = texIndex.Where(x => x.atlasName == thisAtlasName).ToArray();
 
            //and within that, get the unique url lists
            //http://stackoverflow.com/questions/2537823/distinct-by-property-of-class-by-linq
            TextureDownloader[] atlasDownloaders =
                thisAtlasurls.GroupBy(x => x.url)
                        .Select(g => g.First())
                        .ToArray();
 
            //and get just their textures for the packtextures
            Texture2D[] textures = atlasDownloaders.Select(x => x.tex).ToArray();
            
            //pack textures and set up the material
            var atlasTexture = new Texture2D(1, 1);
            var coordinates = atlasTexture.PackTextures(textures, 0, SystemInfo.maxTextureSize);
            var material = new Material(Shader.Find("Unlit/Transparent"));
            material.SetTexture("_MainTex", atlasTexture);
 
            //load a new atlas and set its material
            var go = (GameObject)Instantiate(AtlasPrefab);
            go.name = thisAtlasName;
            var atlas = go.GetComponent<UIAtlas>();
            atlas.spriteMaterial = material;
            
            //add a sprite to the atlas for each unique
            int j = 0;
            foreach (var tex in atlasDownloaders)
            {
                var coordinate = coordinates[j];
                var sprite = new UIAtlas.Sprite { name = tex.url, inner = coordinate, outer = coordinate };
                atlas.spriteList.Add(sprite);
                j++;
            }
            atlas.MarkAsDirty();
 
            if (SpamLogs)
            {
                Debug.Log("Atlas: " + thisAtlasName + " texture count: " + textures.Count() + "coords: " + coordinates.Count());
                Debug.Log(thisAtlasName + " atlas : size " + atlasTexture.width + " x " + atlasTexture.height);
            }
        }
        Debug.Log(Helpers.TimeStamp() + "End updating atlases");
    }