Thanx for the recipe! But - how should that work behind the clouds? I'd like to have clouds from the built-in skies in front of the moon, and as long as something is in any finite distance, no matter how far away, the clouds are behind. So are other atmospheric effects! And mist vanishing behind the moon wipes away all illusions... Of course one could make cloud objects which in turn are placed in front of your moon object, and one could ... Anyway, all the hackers and data fiddlers could do something useful, I believe, in getting this to work.