So, I'm making a building and I'd like to make a molding around it on the top, so I press Ctrl-R to slice it and this is what appears. enter code here`

But instead what I want the slice to look like is like this (the slice is in purple): enter image description here

  • $\begingroup$ CTRL + R is a Loop Cut. It's not literally a "cut" but a seam (of sorts). You may need the Knife Tool but i am not well versed with it. Im sure someone will help you. $\endgroup$
    – Dontwalk
    May 16 '18 at 19:30
  • $\begingroup$ Thanks! Yeah, the knife tool worked perfectly! I just got into an isometric view in one side, turned on the cut through with Z anc used C to fix to an angle, it cut like a charm :D $\endgroup$
    – sergih123
    May 16 '18 at 19:46
  • $\begingroup$ One of you please make an answer. It seems that you have found a solution for something others might also appreciate. And it would get this out of the list of unanswered questions. @Dontwalk $\endgroup$
    – Yunnosch
    May 16 '18 at 20:00

[Answer added for completeness.]

⎈ CtrlR initiates a loop cut and a new edge loop intersecting the chosen edge.

To cut through a number of edges, which are not connected by edge loops, use the Knife Tool.

  1. Go to an orthographic view (front view).
  2. Press K to enter the knife tool, press Z (to enter cut through mode) and C (to constrain the angle). Then draw a poly line with two LMB LMB clicks. Press ⏎ Enter to confirm.

enter image description here

The options you activate while the tool is selected.

Cut through Z
Allow the Cut tool to cut through to obscured faces, instead of only the visible ones.

Angle constrain C
Constrains the cut to 45 degree increments.


It's impossible because the loop cut tool is based on your topology, it basically creates one or more loops inside a loop.

However, what you can do is to use the Knife tool with K, if you watch the 3D viewport's header you will see the Knife tool's options. including the "cut through" Z which, once enabled via its shortkey Z, will allow you to cut a straight line through the mesh. Just set a side/front view and that will do the job.

enter image description here


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