Spin Edge for Rhino SubD Tools

Rhino SubD
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According to the Pushing Points Topology Workbook, Spin Edge or Rotate Edge is an expected tool for polygon/subd modelling. So, I decided to roll my own.

spinedgeprototype

Current Limitations:

  • Nothing to support triangles or ngons yet
  • Some face cases that don’t appear to work. This is probably due to the simplistic nature of the script and logic I’ve employed, which is rather heavy handed This can be seen in the gif, might be something about topological vertices
  • Not supported for meshes, just subds so far
  • Any creasing information will be lost as I convert from subd > mesh > subd

Bugs

  • Where vertices in a mesh lie in a straightline, during the subd conversion these points are removed? See below. On the left, converted to subd after moving the inline vert out a little bit. Is this by design?
    image
    image1456×567 43.9 KB

! _-RunPythonScript "<full path to your script including extension>"
(Path example: "C:\Users\<username>\Documents\Myscripts\TestScript.py" )

Spin Edge.py (7.0 KB)

@theoutside is this a tool that has ever been in development, or suggested by devs/users?

3 Likes
2

we have a swap edge for mesh tools but they do not work on subd-

would be a good add to the toolset.

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https://mcneel.myjetbrains.com/youtrack/issue/RH-68924

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Thanks Kyle. Just for my own satisfaction, it would be interesting to hear if my logic worked out! Also regarding the bug of the mesh having edges that line up, when converted to subD these points evaporate.

Pretty much happy to just contribute the code I’ve made to the community to use. Not sure who deals with SubD though.

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I’d have to defer to the math and programming folks…I’m but a humble art school grad.

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Nice, I’ve just found this topic since I was confused by the naming of the command.

Looks like this is available as a native command now…

3 Likes
8

yep- SubDSpinEdge is the command

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Cool! It was a fun scripting exercise for me and nothing more :smiling_face: would be cool to see what the pro solution was! I think it was @pierrec

1 Like
10

Hi
I’m trying to understand a use case for this new command… are there any?
[Rhino Help only explains what it does, not where it can be of use]

thanks a lot

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helps to sort out topology issues, especially around star points-

useful to change the patch flow from one path to another.

1 Like
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Thanks,
A concise and clear explanation [will be good to have your words were add into the help entry for the tool]

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Have you seen the first post?

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Our docs tend to explain HOW to use a tool… sadly not WHY to use a tool…