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I am trying to create a primitive pipe and I need to add a small cylinder on each selected polygon (see screenshot) to make rivets. How do I do this ? enter image description here

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Good reason to use Instancing (DupliFaces in old terms)

  1. Duplicate selected faces and separate it from base object;

  2. Create Cylinder, make it parent of separated faces object and copy location - origins must match each other;

Updated:

cylinder to object as instance

  1. In Object properties, on Instancing tab select Faces.

DupliFaces

As instance for DupiFace Cylinder will not be rendered!

After that you can Make Duplicates Real for next processing.

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  • $\begingroup$ Could you please describe step 2 in more detail ? $\endgroup$
    – NewBee
    May 27 '19 at 15:16
  • $\begingroup$ It doesn't work for some reason. I select cylinder then selected separated faces of the pipe and do CTRL + P --> Object (Keep transform). But it doesn't create other cylinders like it is shown on your upd screenshot 2. It just connects these objects so now if I move cylinder, faces also move. $\endgroup$
    – NewBee
    May 28 '19 at 11:18
  • $\begingroup$ 3. In Object properties, on Instancing tab select Faces. have you done this? $\endgroup$
    – RUben
    May 28 '19 at 12:14
  • $\begingroup$ Yes, but this still works wrong. Now it looks like that imgur.com/a/S11fyua $\endgroup$
    – NewBee
    May 28 '19 at 15:20
  • $\begingroup$ To position duplicates in the right places according step 2 you should copy location (maybe with rotation and scale) from base object to instance. Blender very sensitive about scale - clean or apply it to base object! $\endgroup$
    – RUben
    May 28 '19 at 16:04

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