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a. I'm new to Geometry Nodes and would like to ask how can one achieve the following using them:

  1. take an object (could be the monkey head) as reference
  2. place one more such object just above (on z-axis) the first one and rotate it 90 degrees
  3. add third one above the second and rotate 90 degrees more. And so on...

b. Does it create a real mesh, or only the first reference object is "real"? (i.e. can I, e.g., connect some vertices from the first bottom object with the vertices of the last into a single mesh?)

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  • $\begingroup$ For Blender 4.0 experimental build try Repeat Zone ... here is some explanation $\endgroup$
    – vklidu
    Commented Jul 27, 2023 at 19:34

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You can use simplified quellenform's answer ... this node tree is assigned to Monkey.
Mesh Line > Count use for number of instances. Empty object is used for Loc, Rot offset step ...

enter image description here enter image description here

Blender 4.+ ... you can test Repeat Zone for even more simpler way ...

enter image description here

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  • $\begingroup$ what about question (b)? $\endgroup$
    – user1876484
    Commented Jul 27, 2023 at 19:41
  • $\begingroup$ It depends :) You can add Realise Instances node, than you can access any vertex in generated mesh. The problematic part would be to create a selection of these specific vertices. It really depends what do you want to connect. Or if you don't mind you can Apply modifier and connect then manually in edit mode. $\endgroup$
    – vklidu
    Commented Jul 27, 2023 at 19:46

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