Another thing that makes what you're asking for about automatically doing the "maximum radius" fillet is that it's not unusual for the fillet to be kind of a bit mangled or poorly formed when you're trying to generate one with a radius that is right close around the neighborhood of where it starts to cross over itself. It's easy for the cross sections of the fillet surface to start to pinch together as they get close to crossing over each other and so shooting for that exact maximum spot is probably going to have bad side effects.
Something like ten percent less than the maximum or something similar to that would probably be a better target...
Anyway that's another complicating factor in what you are describing.
- Michael
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