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I dont understand why something that should be so simple in any 3d modeling software doesn't work in Blender

All I want to do is splice these faces to add a door to my floor plan

I tried using the knife tool, I selected on the first edge, then dragged to the opposing edge. Clicked Enter, nothing happened, no split, no new faces or new vertices

I tried selecting opposing edges, for some reason when I select the opposing edge with SHIFT, it just select the adjacent edge to the currently elected edge instead, and Subdivide operation creates a split between the wrong edges.

I used to be able to select opposing edge by holding ctrl and dragging, but now that I have 3 edges instead of 2, It doesn't work. As you can see, it worked on the first two edges, but now I am stuck because I cannot subdivide the face below, and I cannot Ctrl+Z out of it

All I want to do is split the face down the middle, how do I do this?

Why doesn't the knife tool do what it's supposed to?

enter image description here

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2 Answers 2

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Use CTRL+R. This will divide the planes along the circumference. enter image description here And also after pressing the left mouse button will allow you to choose where exactly you want to divide the faces. enter image description here

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That one lonely edge causes n-gons, making it all harder.
Keep your life simple and use loopcuts and quads ;)

  1. Use three loopcuts to define the doorframe
  2. Select the three faces and press Delete > Faces to remove
  3. Select bottom edge and press F F F to complete the doorframe

enter image description here

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