To bad for me. I know I don't use sketchup in a totally "normal" way.. I's very important for my project to go from a very large country view to very detail view... I wonder if there is another 3D soft as easy as Skecthup able to do that kind of things and better in animations... At least with your answer I can stop dreaming and crying and jump to the two files solution I was pushing away... Thank you (so) very much. ++