LOL
Really sorry for having wrote that in French, and thanks a lot for you acid44

here is what i wanted to say:
the code gives me circles which are disposed in a specific way, when i select all of the them and apply LOFT, it gives me a spiral. until nnow everything is OK but the problem is that in this spiral, and exactly in 2 places of each turn, the spiral gets a null ray..
i didn't knew what was the problem so i tried to select some of the circles (which i thought to be causing the problem) and applied "reverse curve direction", but the problem is still there!

i don't really know how to do about
so if someone is able to help,i'll be very thankful
[excuse my english please] :blush: