Thanks man!! It was a lot of help. ^.>

I really have learned alot now that you mention the Min Edge Angle and now since I've been tweaking the Min Edge Angle for some time under the vector render. This was the effect that I wanted to know a long time ago too, but couldn't figure it out so I just forgot about it. But now that you mentioned it ^^ I can understand the vector render a little more now.

^.^
I've never really paid attention to that edge number attribute, but I see now, the number between 1 and 90 determines the detail of edges shown in the outcome render view. But yeah, when you deform the object too much, the diagonals starts showing up again.

Probbaly the best way to get rid of the diagonals is to maybe turn my NURBs into poly and harden the edges or something.