Object with a creased surface. Use DivideAlongCreases

I was working filleting an object. At some point with FilletEdge I got this error:
“Ignored 1 edge in object with a creased surface. Use DivideAlongCreases to fix the object.”
What is this and what causes it?

This thread describes it:

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I started that thread. Two responses suggested “Use DivideAlongCreases” to break apart a surface. I don’t understand how my current problem object that started out as as simple cube with other shapes Boolean Unioned to it, would need that command to make filleting possible. Though the command fixed the problem, I don’t know what it actually does, or what in my modeling process mad the object need it.

Hello - it is possible to have single surfaces that have hard corners, or creases - FilletEdge does not like these, so the command mentioned splits up an object into a polysurface with faces joined where the input had creases.



Terribly late here but I ran into a similar problem today. Maybe it helps.

FilletEdge started giving me this error on each edge I wanted to fillet after I had made a couple of fillets in other sections of this polysurface. What worked for me was to explode it and join everything again, and then FilletEdge started working normally again for some reason. Not sure it was the best solution but at least it worked and let me continue working on that shape.