Does anyone know what happened? When I use FlowAlongCrv, the SubD points appear as follows… And if I edit in box mode, the model becomes even weirder…pls help
Could please you share this 3dm file? Thank you.
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share.3dm (204.8 KB) thank you so much
Thank you for your feedback. It looks this is a bug in Flow, and I will log it with our development engineers later. I have logged it with our development engineers.
RH-91258 Flow: Question on Sub d with flowalongcrv
Here is a temporary solution for you: you can use ExtarctControlPolygon + ToSubD to achieve your requirement, and for your reference.
Will this way lose the history?
Yes, it will lose the history.
looks like it makes a difference, wether flow is applied while box-mode or smooth mode is active
this also influences how history is updated !!
(history update in box mode is nice, while in smooth mode the nose-like shape appears)
my guess is also that the combination of crease and n-gon might be the source of some issues: (colored n-gon)
@kiga_ng did you check if flowAlongSrf has the same issue ?
extrude both the base and target Curve and
mac intel, Version 8 (8.26.25349.19002, 2025-12-15)
cheers - tom
This is flow along srf in smooth mode, you can see the distorted edge
then i edit the master in box mode , the edge becomes better from top view, but it’s going weird to the front view .
sub-d-surface.3dm (244.3 KB)hope anyone knows how to solve this problem 
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