But you quoted what I meant with the purpose of contradicting the statement, right?

I didn't say the prop was OK in Catmull-Clark. I said, and you quoted, "so long as the partially welded objects are coplaner". Clearly the partially welded objects in the test prop are not coplaner, so my qualification doesn't apply.

Leaving that aside, it is OK if the partially welded objects are coplaner - yes or no?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)