I'm trying to make these loop edges straight around this rounded cube so I can easily place a shrinkwrap-like packaging and make it look good.

I tried changing the size using different methods or sliding them but I can't get them to keep the curvature of the object.

In yellow, the edge loops I have now: In yellow, the edge loops I have now In pink, how I'd like the edge loops to look, but keeping the main object curvature: enter image description here

  • $\begingroup$ Did you try to select one loop and hit s, z, 0? Assuming your image is in front view. $\endgroup$
    – LeoNas
    Feb 20, 2020 at 11:18
  • $\begingroup$ Yes, that's the first thing I tried but the vertices move off the main object curve, what I would like is to slide the edge but it doesn't look good either. I haven't found a solution yet but I should probably find a different approach when modelling. $\endgroup$ Feb 20, 2020 at 13:56

1 Answer 1


You can use the Knife Project tool, to cut a new edge loop.
It will perfectly follow the object's curvature.

  1. Add a plane and position it where you want the cut
  2. Select the plane first and then your object
  3. Go to edit mode and use Knife Project with Cut Through checked.

Note: The cut depends on your current view - front/side orthographic works best.

enter image description here

As Robin Betts kindly pointed out, it's better to put the cutting geometry outside of the object, which allows to cut multiple edges at once.

Projector parallel to viewing plane...
enter image description here

Here, a grid with its faces (only) deleted
enter image description here

.. so multiple edges cut simultaneously.
enter image description here

  • 1
    $\begingroup$ Thank you! I tried the first option on my own first but even though it looks like it keeps the curvature, it does not when you turn the object around. I will try the second one but it seems I should probably model the object again thinking how the UV will wrap first though. $\endgroup$ Feb 20, 2020 at 11:06
  • $\begingroup$ Happy to help. If you get stuck anywhere, feel free to ask :). $\endgroup$ Feb 20, 2020 at 11:07
  • 1
    $\begingroup$ Thanks again, that's exactly what I needed, the knife project tool worked wonders :) $\endgroup$ Feb 20, 2020 at 15:13
  • 2
    $\begingroup$ @JachymMichal Absolutely nothing wrong with your answer, (UV'd) but it's unusual to have the projector in that orientation: see suggestion $\endgroup$
    – Robin Betts
    Feb 20, 2020 at 16:00
  • 1
    $\begingroup$ @RobinBetts Thanks for pointing that out, you're right :). No idea why I used it that way. Let me borrow your images to improve the answer... $\endgroup$ Feb 20, 2020 at 19:27

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