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Hi @TimF Thank you! In this example, I did make the poles contrained to be coincident to the line ends. But there seems to be no way to SEE those constraints except by observing the real model update.
Hi @TimF Thank you for your detailed comments!
I don't know what you mean by "there are no constraints". The surface did change when the lengh of the lines changed. This makes me able to control a B-surface just as controlling a B-spline pole by pole.
As to the inconsistency of X-Form, I think that's very fundamental way of how X-Form works, but not an issue that can be fixed easily. Therefore let me forget it.
I'm simply pointing out that when you stated "I did make the poles contrained to be coincident to the line ends" that you were not technically constraining anything because constraints do not exist in the X-Form command. If they don't exist, why would you use those words? That's what I mean. In the end, you're simply editing a surface or spline with that command and the ONLY parent will be the source spline or surface - no lines used as reference. While it might be ASSOCIATIVELY updating, there certainly aren't specific constraints (think Sketch and Assemblies).
You seem hung up on the lack of children - I'm simply also explaining WHY there aren't any children - X-Form is an edit, not a feature.
I cannot explain why it's not behaving as you expect - you will have to contact GTAC with similar examples to point out what you feel is inconsistent behavior.