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I want to make these 2 inner faces with rounded edges like the left image

At the right image I used Ctrl+B to make the outer edges of this board rounded but I can't apply this to inner face as the board itself is a cube with some modificationenter image description here

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  • $\begingroup$ If you want to smoothen geometry corners you need more geometry. In this case it would be beveling corner vertices of that inner red rectangle. After that one will have to get rid of Ngons. $\endgroup$
    – Mr Zak
    Oct 1, 2017 at 11:24
  • $\begingroup$ can u attach the file $\endgroup$
    – atek
    Oct 1, 2017 at 12:12
  • $\begingroup$ Check this topology. It's mostly manual work. imgur.com/0I8gMfF $\endgroup$
    – cgslav
    Oct 1, 2017 at 23:42

2 Answers 2

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For your example this could do the job:

  1. Enable LoopTools addon in the User Preferences (CtrlAltU > Addons)
  2. Select the outer vertices
  3. Apply Relax function with Linear Interpolation

enter image description here

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  • $\begingroup$ It will distort whole rectangular shape. OP asked about rounded corners. $\endgroup$
    – cgslav
    Oct 1, 2017 at 18:53
  • $\begingroup$ Still, I think it should work for the case illustrated in the second image. $\endgroup$ Oct 1, 2017 at 19:08
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(tested with blender 2.9)

goto edit-mode

select only the 4 corner-vertices of the inner rectangle.

press CTRL + B

then, immediately press V (for vertex mode)

use mouse and scroll wheel to round the vertex

blender3d - rounding corners of an inner rectangle

video (external link):

https://i.stack.imgur.com/oT3GN.jpg

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