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enter image description here

How can I cut an arc into a square plane? The gif above shows what I want to do, but, in another software.

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4 Answers 4

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No need to subdivide the whole plane, no need to add vertex groups or modifiers!

All you need is Ctrl+Shift+B and middle mouse button scrolling on vertex or vertices:

enter image description here

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    $\begingroup$ much thanks its to shortcut i know to bevel but this bevel is awesome $\endgroup$
    – atek
    Commented Sep 27, 2016 at 16:05
  • $\begingroup$ Thats one very useful hidden feature, thanks! $\endgroup$ Commented Oct 1, 2017 at 18:22
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    $\begingroup$ Any way to do this with a trackpad? $\endgroup$
    – rraallvv
    Commented Dec 29, 2018 at 20:52
  • $\begingroup$ @rraallvv Not interactively. You have to confirm the operator then go into operator options (bottom of Tools panel) and set the parameters of that bevel. $\endgroup$ Commented Dec 29, 2018 at 20:56
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You can achieve this with the Bevel modifier.

Tab into edit mode and select the corners you want to curve. Press CtrlG followed by A or click Mesh -> Vertices -> Vertex Groups -> Assign to New Group to assign them to a new vertex group.

Tab back to object mode and add a Bevel modifier.
Enable Only Vertices set Limit Method to Vertex Group and select the vertex group you just created (by default it will be named Group). Adjust Segments and Width to meet your needs.

enter image description here

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You could subdivide a plane twice, then add a subsurf modifier at level 2. To sharpen the edge on one side and remove the rounded form, add an edge loop with Ctrl+R

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    $\begingroup$ Subsurf will not add circular arc. It adds a spline arc which is C2 smooth opposed to circular arc which is not. $\endgroup$ Commented Sep 27, 2016 at 13:38
  • $\begingroup$ This method is not very performance efficient. It adds way too many unnecessary polygons. Bevel is much better. $\endgroup$
    – Simon S.
    Commented Nov 10, 2016 at 16:04
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I had an issue with this also (a silly one) - if you have scaled your object unequally you will not get a circular bevel, but rather an elliptical one. This makes sense, and is how it should work. Just object menu --> apply --> scale before you bevel to fix it.

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  • $\begingroup$ You saved my day … +1 $\endgroup$
    – TheEagle
    Commented Dec 13, 2021 at 21:08

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