private IEnumerator LoadTrackFrom(WWW www)
{
yield return(www);
Debug.Log("loading track from + " + www.url);
if (www.error == null)
{
var track = JsonConvert.DeserializeObject <Track>(www.text);
tilesManager.ResetTiles();
LoadTilesFrom(track);
}
else
{
Debug.LogError("network error: " + www.error);
}
}