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Which is the best way to model this circle? How to cut out a rectangle out of a cylinder? I have issues with the subdivision modif. Maybe boolean?

enter image description here

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  • $\begingroup$ No need for all caps. $\endgroup$ – user1853 Jun 18 '19 at 13:24
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Your shape is a little bit more complicate than just rectangles on cylinder, but if I had to do the basic shape of rectangles on cylinder, as it is a pattern repeated around a circle, I would do it with a Simple Deform modifier / Bend mode:

  • First create your pattern with a plane that you rotate, subdivide, extrude, as it is symmetrical on the X, Y and Z axis you can use a Mirror modifier with the Clipping option activated.

enter image description here

  • Repeat the pattern with an Array modifier. Enable the Merge and First Last options.

enter image description here

  • Apply the rotation of your object (ctrlA) to make sure it is. Give your object a Simple Deform modifier, choose the Bend mode and a Deform Angle of 360°.

enter image description here

  • Now as you are going to add a Subdivision Surface it's hard to keep a rectangle without completely messing the mesh. Here is the topology I would personally use: Create a bevel on the 90° rectangle angle, join some vertices, dissolve some edges, add some edge loops to sharp the angles, as below.

enter image description here

You can continue to work on your basic shape so that it looks more like the real one.

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  • $\begingroup$ I've tried it the first time and it works, Thank you.. BUT, i've tried it again and than i got an ugly oval circle... What can be the problem? During "apply roation" or extruding? Pls can you help me again? $\endgroup$ – KOsmani Jul 1 '19 at 10:09
  • $\begingroup$ could you please share your file? $\endgroup$ – moonboots Jul 1 '19 at 10:36
  • $\begingroup$ I got it :). I've apply not only the Rotation but also Scale. Thank you very much! $\endgroup$ – KOsmani Jul 1 '19 at 11:43

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