I would like to use circles as shape curves in SubDLoft and SubDSweep1 commands to make SubD surfaces. How do I draw SubDFriendly circles?

My understanding is that it’s mathematically impossible to draw a SubD friendly circle. It will always be an approximation. _MakeSubDFriendly will generate this approximation. circle on the left – _MakeSubDFriendly on the right [image]

Really simple, rebuild the curve to degree 3 with a larger number of control points. More control points equal more segments and closer to true round. A degree3 with 8 control points has 0.04mm deviation from true round. Degree3 with 12 control points has 0.008mm deviation from true round.

This is probably a good time to review this: [image] SubD Friendly Curve SubD There are a lot of technical details and assumptions wrapped up in this topic. I’ll start from the beginning in case somebody unfamiliar with the setting reads this thread. Why do we care if a …

[image] inju: MakeSubDFriendly I forgot this command and I could not find it in the Rhino documentation. (It is not mentioned in Rhino 7 documentation.) By the way, Rebuild command has Make SubD friendly option.

Hi Andrew - [image] andrew.nowicki: (It is not mentioned in Rhino 7 documentation.) The YT item for this command has not yet been completed - I’ve given it a nudge… RH-59043 -wim

[image] MakeSubDFriendly Added, sorry for the delay.

A SubD face or cylinder that is a perfect octagon in box mode will yield a curve that has a diameter that varies from perfectly circular by about 0.125%. Below 8 sides, I can start to see the divergence from round if I look closely, and I bet a lot of other designers can too. At 6 sides, the diverg…

I agree with you that in terms of accuracy 8 faces is enough for most uses. However it may not be enough to capture the features or details you need. I have been playing with even multiples to capture design intent and symmetry and end up somewhere between 8 and 12 faces around. I try to keep round …

I could not find the MakeSubDFriendly command in the list of new commands: https://docs.mcneel.com/rhino/7/help/en-us/commandlist/newinrhino7.htm …and I could not find it in the list of all commands: https://docs.mcneel.com/rhino/7/help/en-us/commandlist/command_list.htm

I have an SOP list to follow when adding new commands to Help, I won’t miss adding them to these two pages. You didn’t see them because Amazon CloudFront caches web pages on a webserver near your location. I can force CloudFront to update the cache, but I don’t usually do that. [image] Your web b…

SubDFriendly circles

Serengeti (Rhino BETA)

dale (Dale Fugier) December 2, 2020, 9:32pm 5

This is probably a good time to review this:

– Dale

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SubDFriendly circles

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