Here is a problem I encounter frequently but have not found a good answer to. I would like to fill this hole while maintaining tangency with the upper surface. The radius needs to drop to zero at the end. This a mathematical possibility but does not work well in my Rhino attempts.

Let’s say I do NetworkSrf with edge tangency, the right edge comes out tangent but the top edge does not.

If I do Matchsrf I can get the edge tangent but that create a bulb at the end.

I was wondering if anyone has come up with a good solution to this problem. It occurs at the end that has to match up to other surfaces so there is no flexibility in the final red and blue edges.

Problem Corner.3dm.zip (122.1 KB)