I did not mean the unit (that should not matter even if you change it on the fly while modelling) but the scale. If you use the Tape Measure tool to measure a side of the building, what do you get? (I also model in centimetres)

@unknownuser said: how to do when my surface is allready in form? i can't bend a surface to match the curve perfectly arround my door! You could also use shape bender which is better to curve around already existing curves. @unknownuser said: finally i divided my line of rounded bricks and rotated each brick texture one by one Well, that's also a solution - and I have often done that myself so don't worry. They look nice now!

Solved!!!! Great thanks man I have 27" and 15" dual screen and sometimes i rotate the big one... When i put it vertical, m'y smooth window appeared in the middle of my 15" screen (where it was not before rotation!)