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Using geometry nodes - how to create doo sabin modifier:

enter image description here

1st image is original mesh 2nd image is desired result 3rd image is after 2nd iteration

"The Doo-Sabin process generates one new face at each original vertex, new faces along each original edge, and new faces at each original face."

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  • If you want to do it non-destructively, use a Bevel modifier for step 1. Set the Segments to 1 and the Limit Method to None. Step 2 is a bit problematic... the rounding of the shape could be accomplished with a Subdivision Surface modifier, but it wouldn't make the yellow and blue parts narrower. – Gordon Brinkmann Oct 16 '22 at 14:00
  • @GordonBrinkmann: Looks like Markus von Broady doesn't think it's problematic :D :D :D – Chris Oct 16 '22 at 15:07
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    @Chris coloring coming soon :) – Markus von Broady Oct 16 '22 at 15:14
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    @Chris Yeah, I didn't think about GN and actually never really thought about what Dual Mesh is doing. While everyone else in tutorials etc. nowadays doesn't seem to do anything else than GN, I only have rudimentary knowledge of it and almost never use it in my daily tasks. – Gordon Brinkmann Oct 18 '22 at 06:07
  • @GordonBrinkmann: Whaaaat?! I just made a tutorial about animation nodes!!! Which i think - is still much more powerful than geometry nodes (in a lot of areas) and you can make a lot more with it and its possibilities are far less restricted because - you can make your own nodes AND(!) you can use the whole Blender API via using python (python nodes!). And as I understood GN - python nodes will never come (although I don’t know why) – Chris Oct 18 '22 at 07:31
  • @GordonBrinkmann: I wouldn’t came up with such a solution as well even so I have a little GN experience…Marcus is - like just some others here - which aren’t many but some - from another „planet“ - he has an outstanding understanding of GN and other things - which I wish I had - but I am still learning… – Chris Oct 18 '22 at 07:36
  • @Chris I know Animation Nodes. But still very many new tutorials use Geometry Nodes. And for my daily work I need neither of them. Mostly just simple modelling and texturing. Oh, and I know answers from Markus. I've been on this site for a while now ;) – Gordon Brinkmann Oct 18 '22 at 07:40

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I don't know if you want to achieve the coloring, without it the setup is pretty simple:

Coloring

Markus von Broady
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