Originally posted by Turbo Dan im having a problem with an air duct on the lip of the front bumper. i want it to be square, but as you can see in the render, when i covert to subd it goes round. how can i make this stay really square? You'll never get it perfectly square with subds but you can get pretty close by converting to subd, selecting the edges in the original mesh that you want squared off and using the crease tool. You can crease more than once to go sharper and sharper. I think three creases is as far as you can go. It does make your resulting geometry much denser however and this is part of the reason I've gone away from subds for tech modelling and just stick with polys and poly smooth (see my 66 vette posts - https://forum.simplymaya.com/showthre...threadid=22665). HTH MrR