I was working on a set of surfaces that was causing problems and posted in another topic.
One of the problems I have is getting the surfaces to have a smooth transition.
Here I have a set of surfaces. The gray surfaces are fixed and I am trying to fill in the oddly shaped red area. I need to be tangent to the gray at the right but just coincident to the one at the top.
The red surfaces are created with Networksrf with the edges tangent.
Here I have done fitsrf with degree 3. You can see a noticeable crease at where the top and right red surfaces meet.
Here, I have done fitsrf but with degree 7. Notice that the crease has gone away.
As you one would expect, it takes a lot longer to do fitsrf on a 7, 9, 11 degree surface than a 3rd degree surface—much larger matrices that have to be inverted.