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How can I cut a semi-circle out of a curved surface, such as this:

this object on a rifle

As you can see from the picture, the circled area is one I'm having trouble with. I can't seem to find a way to cut a hole into a curved surface without messing up the topology. Could someone help me with this?

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  • $\begingroup$ possible duplicate of Cutting a circular hole in a hollow cylinder without distorting the cylinder $\endgroup$
    – Ray Mairlot
    Commented May 31, 2014 at 14:27
  • $\begingroup$ @Ray Mairlot, don't think its a duplicate, see the answers are quite different. $\endgroup$
    – ideasman42
    Commented Jun 1, 2014 at 2:25
  • $\begingroup$ The problem with this question is its not matching the photo (which shows gaps in a cylinder). $\endgroup$
    – ideasman42
    Commented Jun 1, 2014 at 2:27
  • $\begingroup$ @24Duckies - Can you edit your question so its not a duplicate of blender.stackexchange.com/questions/5856/… ? $\endgroup$
    – ideasman42
    Commented Jun 1, 2014 at 3:59
  • $\begingroup$ @ideasman42 yes, upon closer inspection of the picture I see the difference, was going by the title too much. $\endgroup$
    – Ray Mairlot
    Commented Jun 1, 2014 at 12:44

1 Answer 1

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Cutting it without messing up the topology (ngons, tris, unwanted distortions, etc.) will be hard.

However, for your specific case I think you might have better luck building the shape by extruding/filling.

For example:

  1. Duplicate a cylinder:

    enter image description here

  2. Select some of the edges along the top/bottom of the cylinder and press W>Bridge edge loops:

    enter image description here

  3. Repeat for the other side(s), then add a solidify and a subserf modifier:

    enter image description here

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