Hi, i just learned and would like to share with you another way to create an offsetable surface from 3 boundary curves. I welcome your comments, or better still, other better workarounds you might have. I attached here the creo 2 file for yr reference.
I certainly like the final quilt to be a smooth, single surface. The over-built surface technique will allow me to achieve that. However, there are some issues I face in this approach:
1. The additional curves(curve A and B in the pic below) to build the over sized surface are pretty arbitrary. I need to spend quite a bit of time, rather by trial-and-error to fine tune the curves to match the final curve(from ID). Any technique to build these curves?
2. Not robust. Each time if there is a change in the ID curve, I need to repeat (1) above. They are not associated to the ID curve.
Any recommendations to overcome the issues above or... i may be missing something here. Thanks in advance for your input.
Hi,
In this case you might want to try the 'influencing curve' under 'Options' in the boundary blend.
It 'magnets' the surface to the selected curve with the ability to control the influence.
The influencing curve can run in direction one or two or connect one and two!
And don't overlook the lowly boundary blend. With careful reference management, it can close ends nicely.
Sweep 2 is the control surface for the C2 orientation. It makes sure the tip doesn't bunch up also by making sure the angle matches the "keel's" ending angle.
The bottom only has a Normal constraint to the vertical plane. This makes sure there is no "seam" when you mirror it. There is actually quite a bit of control over the Boundary Blend if you want to dig into it.
Again, Sweep 2 is very important to manage the "tangency" angle. Using the VSS in Sweep 2 assures smooth transitions.
What this really comes down to is recreating more than just the hole in the surface. Why not just replace the "bad" surface. There is a "replace surface" feature somewhere.
Awesome! Never thought of solving that bad corner though this way. It's a robust approach. Thanks. 
Thanks again. I repeat yr steps with some simplifications and the method works ! 
Also, this led me to think about the location of the degenerate corner. May be we have gone a bit too far 
. Like Jose_costa pointed out in his reply, just change the selection sequence of boundary curves the problem will be gone. Or... this only works for this particular example?
Nevertheless, i have now learned several different ways to deal with 3 sided surfaces. I can then have more options each time i face with the same situation. Cheers !
if you`re lucky to have ISDX, Style feature in Creo2 will solve this for you.
Even 5 sided boundaries are handled surprisingly well. I checked, result are very welcome.
Question: Is it possible to use style option "trimmed rectangle" to create all the triangle surfaces in yr tutorials ? In that case, we don't even have to worry about other methods.
