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What can you do to get clean rectangular shapes in a cylinder while using the subdivision surface modifier?

For the time being I've been trying to extrude them in the model and adding creases or support edge loops, but the end result looks weird even with an edge split modifier. The problem with support edge loops is that they affect other parts of the model that don't really need them and if I add some triangles to stop the flow things start to look bad.

After those problems, I added the rectangles separately by duplicating parts of the edge loop and adjusting them to the smooth form of the cylinder, but I was wondering how someone with more experience would tackle this.

enter image description here

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Adding the rectangles separately is probably easiest. If you are stuck on adding it into the topology, here is what I got by using mark sharp, edge creases, and the cast modifier with a vertex group. (the base topology is simple enough to be self-explanatory)

enter image description here

If you want to remove all n-gons, you can add two loops and line them up with the top and bottom of the box. Then knife cut between them to get this:

enter image description here

One more trick...use the data transfer modifier to fix normals:

enter image description here

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  • $\begingroup$ Very interesting method with cast modifier but I can't reproduce it with full loop cuts (to not to have ngons). Could you elaborate more about it? You could check out my older question about it: blender.stackexchange.com/questions/60710/… in this case working Cast modifier could be a savior. $\endgroup$
    – cgslav
    Commented Aug 29, 2016 at 20:00
  • $\begingroup$ Ok, so it will not work with making loop cuts and then extrude shape? $\endgroup$
    – cgslav
    Commented Aug 29, 2016 at 20:11
  • $\begingroup$ Check this blend: blend-exchange.giantcowfilms.com/b/1859 I'm also using AutoSmooth. $\endgroup$
    – cgslav
    Commented Aug 29, 2016 at 20:40
  • $\begingroup$ What's wrong with the blend you posted? $\endgroup$
    – Jake Duth
    Commented Aug 29, 2016 at 20:44
  • $\begingroup$ Under and over the extruded shape there are some 'glitches'. $\endgroup$
    – cgslav
    Commented Aug 29, 2016 at 20:45

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