LODGroup lodGroup = obj.GetComponent<LODGroup>();
if (lodGroup != null)
{
Transform lodTransform = lodGroup.transform;
foreach (Transform child in lodTransform)
{
var renderer = child.GetComponent<Renderer> ();
if (renderer != null && renderer.isVisible)
{
Debug.Log("This LODlevel is used: " + child.name);
}
}
}