Yes Mark, i have understood, but if i enlarge the camera view, there are some details that aren't good (like the windows on the top side, that i've created only for the lighting) and maybe changing the geometry a bit it's necessary, but only on the top side. Regarding duplication with symmetry, i'm still in trouble because currently on mac os X the command don't work from keyboard shortcut... But i know that you mean other things, ehehe;-) -TTTTTTOXE (wow, it works fine with the T key!)