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I am modelling an airplane, and I want to cut windows into both it's front doors. Every door is a separate object.

What I tried:

  1. I selected both doors in Object mode
  2. I went into Edit mode
  3. I pressed k to activate the Knife tool, then z to enable cut-through.
  4. I cut the window into the left door.

The result was that I had the window only in one of the doors, but I wanted it to be in both doors. The doors are exactly mirrored along the X axis.

How can I make the Knife cut two meshes ?

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2 Answers 2

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To cut through with the knife, press Z after you've pressed K. It won't work if you've selected 2 objects though. You could also use the Knife Project tool for the same kind of purpose, it would allow you to cut with a circle or with the shape you want. You could also link-duplicate your object and mirror it, so that every change you'll make on an instance will also happen on another one.

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  • $\begingroup$ As I said in my question, pressing z did not help. I ended up deleting one of the doors, cutting the window into the left one, then Duplicate linkeding and mirroring the duplicate. $\endgroup$
    – TheEagle
    Sep 15, 2021 at 13:42
  • $\begingroup$ oh ok you say "every door is a separate object", it explains why "cut through" doesn't work, you can't cut through if the other mesh is another object. $\endgroup$
    – moonboots
    Sep 15, 2021 at 15:10
  • $\begingroup$ Also not if I selected both in Object mode, then went into Edit mode ? I can do everything else on both meshes, so why not Knife cut through ? $\endgroup$
    – TheEagle
    Sep 16, 2021 at 16:19
  • $\begingroup$ yes I guess knife doesn't work this way yet, it may comes later $\endgroup$
    – moonboots
    Sep 16, 2021 at 16:33
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I would only cut one door and then use symmetries to create the other door or use a mirror modifier.

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