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I keep running into an issue where I try cutting on a face with a vertex and pressing the Z key or whatever corresponding key to cut with a straight line, but when I reach the bottom and click nothing happens... Sometimes it works fine but it depends on what face I am cutting... How can I fix this and make it where I can cut wherever?

Edit: I have added my .blend file and an image of where I want it cut:

enter image description here

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    $\begingroup$ Failures to K or Ctrl-R, cut, are often useful pointers to hidden errors in the mesh.. usually doubled faces or vertices. Try H hiding bits and pieces around the error.. jiggling vertices around in case they are hiding duplicates. (Also, assuming the target geometry exists, not generated by a modifier) Folks won't be able to help you specifically without a failing portion of the mesh in front of them.. if stuck, please share on blend-exchange.com .. until then, this post is likely to be voted 'unclear'. $\endgroup$
    – Robin Betts ♦
    Commented Apr 7, 2023 at 7:12
  • $\begingroup$ @RobinBetts I am doing this for a business... It is a 3D model of a building and it has certain names, addresses, and sensitive information on it so will people be able to see the image textures on blend-exchange.com? $\endgroup$
    – prestonferry
    Commented Apr 7, 2023 at 13:53
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    $\begingroup$ Hi, @prestonferry.. for sure, you would certainly want your sample to be anonymized .. if possible, make a copy of a minimal representative portion of the mesh, all materials removed, as a new object, and append that object to a brand new empty .blend file. $\endgroup$
    – Robin Betts ♦
    Commented Apr 7, 2023 at 16:16
  • $\begingroup$ @RobinBetts how can I remove all materials and just make it a wireframe, or whatever it needs to be? $\endgroup$
    – prestonferry
    Commented Apr 8, 2023 at 2:53
  • $\begingroup$ Just delete all the materials from the duplicate object's material slots, before appending to the new file. $\endgroup$
    – Robin Betts ♦
    Commented Apr 8, 2023 at 7:54

1 Answer 1

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You're in a situation like the first attempt illustrated below, trying to cut from a vertex on one face, across another which is not connected to it.

enter image description here

In your situation, If you H hide any foreground clutter, and switch on Automerge, with 'Split Edges and Faces' checked:

enter image description here

... with your Snap set to 'Vertex and 'Active' , you can kick Blender into joining the faces by snapping orthogonally to the separated edge, after which the cut will work, as shown in the second attempt, above.

Edit in response to comments

At the moment, you have a continuous edge along the bottom of your frontage:

enter image description here

With Automerge set as shown above, and Snapping set as described, you can GZ snap that edge to an existing vertex on that level, which will insert vertices at intersections along its length:

enter image description here

You can delete the face below the edge:

enter image description here

.. and, having Ctrl - selected all the components of the now divided bottom edge, EZ extrude them downward, snapping to a vertex at the bottom level. This will create all the cuts you wanted to make, in one go.

enter image description here

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  • $\begingroup$ What do I select when I press H? $\endgroup$
    – prestonferry
    Commented Apr 8, 2023 at 19:50
  • $\begingroup$ @prestonferry .. only a suggestion to make your job easier.. I hid all the faces of protruding buttresses to make the bits you wanted to cut more visible, that's all. $\endgroup$
    – Robin Betts ♦
    Commented Apr 8, 2023 at 20:32
  • $\begingroup$ Please don't hesitate to tell me if this is too much to ask, but could you edit the answer and show me with my own Blender file? Maybe that would help... If not we'll probably need to find another way to go about conversing because I think I'm having trouble understanding... $\endgroup$
    – prestonferry
    Commented Apr 9, 2023 at 1:15
  • $\begingroup$ @prestonferry see edit.. hope it helps.. quite difficult to illustrate on your model. You could have a shot at becoming more familiar with the behaviour of Automerge and snapping, on less fiddly geometry. $\endgroup$
    – Robin Betts ♦
    Commented Apr 9, 2023 at 11:14
  • $\begingroup$ Took some time to figure out but it worked... Do I do this for the rest of the faces I can't cut on? Thanks :) $\endgroup$
    – prestonferry
    Commented Apr 9, 2023 at 15:28

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