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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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  • $\begingroup$ 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. $\endgroup$
    – Gordon Brinkmann
    Oct 16, 2022 at 14:00
  • $\begingroup$ @GordonBrinkmann: Looks like Markus von Broady doesn't think it's problematic :D :D :D $\endgroup$
    – Chris
    Oct 16, 2022 at 15:07
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    $\begingroup$ @Chris coloring coming soon :) $\endgroup$
    – Markus von Broady
    Oct 16, 2022 at 15:14
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    $\begingroup$ @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. $\endgroup$
    – Gordon Brinkmann
    Oct 18, 2022 at 6:07
  • $\begingroup$ @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)😢 $\endgroup$
    – Chris
    Oct 18, 2022 at 7:31

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

Coloring

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    $\begingroup$ niiiiiiiiiiiice! +1 $\endgroup$
    – Chris
    Oct 16, 2022 at 15:07
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    $\begingroup$ @Chris I lost over 2 hours because the statistics part of the node tree was failing, and I thought it's the logic in the "next iterations" and redone it like 5 times always with same results ARRRRGH $\endgroup$
    – Markus von Broady
    Oct 16, 2022 at 18:27
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    $\begingroup$ Great stuff.. I bet the OP colouring was only to illustrate.... XD $\endgroup$
    – Robin Betts ♦
    Oct 16, 2022 at 19:47
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    $\begingroup$ @MarkusvonBroady : don’t worry - i waste my time with much simpler stuff! 🙈💁🏻‍♂️ $\endgroup$
    – Chris
    Oct 16, 2022 at 20:05
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    $\begingroup$ Wow! When I posted this I thought "This is a hard question"... this answer exceeded my expectations!! $\endgroup$
    – stackzz
    Oct 17, 2022 at 13:21

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