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I am trying to test Geometry Nodes in Blender 3.5.

I have two different cylinders and apply union operation with Mesh Boolean node as follows:

enter image description here

The geometry nodes for this operation are as follows:

enter image description here

What I want to do is to select faces around sharp edges including the juncture of the two cylinders and apply subdivision to get more faces around sharp edges.

I tried to figure out what kind of node do the work but in vain. Is it not possible yet in Blender 3.5 to do what I am trying to do?

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    $\begingroup$ if you provide blend file you would attract more lazy people (like me) to help you because we don't have to recreate everything on our own $\endgroup$
    – Chris
    Apr 6, 2023 at 13:19
  • $\begingroup$ You should look into the "Intersecting Edges" output of the Mesh Boolean node $\endgroup$
    – Gorgious
    Apr 6, 2023 at 14:44
  • $\begingroup$ @Chris How can I upload blend file. I could not see upload button for blend file. $\endgroup$
    – Seong
    Apr 7, 2023 at 1:29
  • $\begingroup$ @Chris I uploaded a blend file. $\endgroup$
    – Seong
    Apr 7, 2023 at 9:06

1 Answer 1

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you can do it like this...but (!) it doesn't make a nice topology which i think you wanna have...

enter image description here

enter image description here

Hint:

this works only, if you change the settings of one cylinder like this:

enter image description here

the separated geometry (from intersecting) looks like this:

enter image description here

or like this if you increase the threshold:

enter image description here

I have no clue whether it is a bug, if the vertices and edges overlap exactly in mesh boolean...because the result of the intersecting edges is just nothing.

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    $\begingroup$ Thank you so much. As you said, it would be better if the refined topology develops in a concentric way, though. Anyway I can now figure out a little how Geometry Nodes work. It's somewhat odd it works only when cylinder segment size is something other than 32 and 12. Is it kind of bug? $\endgroup$
    – Seong
    Apr 7, 2023 at 13:26
  • $\begingroup$ i assume, but i am not sure. $\endgroup$
    – Chris
    Apr 7, 2023 at 15:02

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