I have been trying to model a pen clip back and running into a strange effect with the subdivision surface that I do not understand. For some reason, the interpolated surface is dipping below the original geometry and then bending back up. I can not figure out why it is doing this. It is best shown with a picture.
You can see the dip down on the arc to the right side. I would have thought it would be a smooth transition from the arc to the first set of control points. I attempted to add some supporting geometry with the highlighted line. But that did not seem to help. Any thoughts? I am just not sure where to start.
I have attempted to add some additional geometry. This has fixed the original issue, but now I am getting some strange artifacts. I will keep futzing with it but if anybody has a suggestion as to the correct type of supporting geometry I would love the suggestion. Thanks again for everybody's help. I learn something new every day.