Notching

Hi all today Iris, Sargam, Kyung, and myself worked on the notches.  I tried to up load the file but was unable to.  We used the screen that Ben had made so its something we could all follow.  Attached are images of the definition and what it produces in rhino.  If you would like a copy of he file let us know and we can e-mail it.  The only thing we couldn’t exactly figure out was triming.  If anyone has any thoughts let us know.

Question

Can anyone tell me why when I draw a curve or any line it is not visible in the viewport? I am drawing it correctly so that is not the case. I have tried drawing it in different layers  and changed the background color but that doesn’t solve the problem. It might be a setting that I accidently activated. It’s probably a quick fix. Please help