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How to quickly create duplicate recessed portion? enter image description here

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I guess there are at least 2 ways of doing it: either you do it "for real" with topology, or you simulate it in the material with Bump or Normal maps

Topology:

  • Create a cylinder with as many vertices as you want
  • Select the face loop
  • Select > Checker Deselect so that only one of two faces is selected
  • Keep the faces selected and Alt+E > Extrude > Individual Faces
  • Scale down these extrusions except on the Z axis with S and Shift+Z

Material:

  • Create a surface with a series of crenels
  • Bake this surface so that you have a Normal image
  • Use this Normal for you whole ring (on my screenshot it's very quick made, sorry)

enter image description here

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