Originally posted by fishca I did the what you say...but it come out a curve look like ribbon. however the thing i want is a solid body. becuase right now i can see through it.....but i don't want that.... what can i do...let it have front and back surface~~ thank you Can you show a screenshot of this particular result? You could achiever a pretty good result converting this NURBS pipe, into a polygonal one. And then it would be just a matter of closing the ends.