How do u make it appear like this?

hey im not totally new to swift but how did the person in this turtorial make the shape look how it does.

the turtorial which is held on this website http://www.kirupa.com/developer/swift/lathe.htm

has a pic on the very bottom that looks amazing and the guy said he made it on the lathe editor…
can someone please inform me how that person made tat look like tat