So many people just refuse to stop ragging on nurbs.
What you want to do is simple.
I am going to describe how to do it with degree 3 curves in u and you will end up with degree 1 curves in v. Getting degree 3 in both u and v is easy but trying to describe in with text is more trouble then I feel like going into. 3x1 will look fine.
1. create a nurbs circle and in the channel box set the number of spans to 18
2. duplicate this curve and pull it the distance to the top of the pen
3. take the first circle and grab cv's in groups of three and scale them uniformly together to form the hex shape
4. now duplicate this curve and pull it to the top of the hex shaped part of the pen
5. go back to the circle shaped curve and scale is just smaller then the hex shaped curve
6. now duplicate the curve from step five and move it just above the hex shaped curve at the top of the pen.
7. now you have 4 curves you could select them all in order from the bottom to the top and select surface>loft (you will get something that looks really scary, but do not worry changing from cubic to linear will fix it) and then in the channel box change from cubic to linear
If you want all cubic surfaces in both u and v. Create three separate lofts. Then you can attach the three surfaces and you will have to add additional isoparms to keep the transitions tight. But for the most part I am sure the result you get following steps 1 to 7 will be fine.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram : 08-04-2010 at 08:28 AM.