I was wondering where I did the mistake. Searching for the cause found the offset value of the SubD has some tolerance. Here an example. SubD was converted to nurbs for the thickness analysis. [Bildschirmfoto 2020-06-06 um 17.43.51] Version 7 WIP (7.0.20154.16016, 2020-06-02) on Mac

The current method that OffsetSubD uses is to offset the extracted control polygon and then make a new SubD from that. It’s a loose way to get a solid while still having SubD control. This isn’t as precise as OffsetSrf which has a tolerance option. You can however use OffsetSrf on a SubD directly an…

This was the same for TSplines, it never bothered me. Question though, would it be possible to have SubD default to file tolerance and stay SubD?

I think there’s some complex math there so I won’t make a guess. I did file https://mcneel.myjetbrains.com/youtrack/issue/RH-58984 though for the devs to look at it. I personally like the loose offset you get now so that I can easily edit and smooth the inner SubD wall.

Yes, I would prefer the loos offset over something that’s difficult or impossible to edit. We used the TSplines loose offset on molded parts. And while the wall thickness wasn’t 100% accurate, it never caused any problems

It was unexpected. When I enter a value, there is a reason for this value. There was no indication of any deviation. I like SubD. If SubD can be controlled more precisely in the future, I will love SubD. Now I know there is a deviation. If there was a hint like ≈ maybe I was not surprised. [Bildsc…

I may be wrong about this, but I believe this will be the expected behavior. As far as I understand it offsets the SubD control cage points 3mm in their normal direction, the offset SubD surface is recalculated in relation to the new control point locations. In most cases this was fine for the work…

Offset SubD - deviation

Rhino SubD

brian (Brian Gillespie) March 18, 2025, 9:49pm 8

RH-58984 is fixed in Rhino WIP

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Offset SubD - deviation

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