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I would like to create a standard square groove in the plane, just like this.enter image description here

But when i switch to object mode, it just almost disappear because I used subdivision. enter image description here

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    $\begingroup$ @Tak You haven't even given him 1 minute to accept your answer before you ask for it? Give him a chance to learn how to use the site on his own and don't explicitly ask for acceptance until he says it solved his problem. $\endgroup$ – JakeD Feb 1 '17 at 13:19
  • $\begingroup$ @pycoder the reason I do this is that I can see on the newsfeed of the questions, some new users never mark the question they asked as solved and never come back to the site, which sometimes makes it harder for people facing the same problem. I asked him to accept only if it solved his problem to encourage/remind him do this incase it was helpful for him. $\endgroup$ – Tak Feb 1 '17 at 13:25
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    $\begingroup$ @Tak I understand your motivation for doing this, but it comes across as begging for reputation. Users should be advised to wait until accepting in case other users can provide better answers. Asking people to accept (when they have not indicated that the answer has helped them) encourages people to accept the first answer, not the best one. If they comment or indicate the answer has helped, then teach them about how accepting works. $\endgroup$ – Ray Mairlot Feb 1 '17 at 14:03
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Same example: Edit Mode

Becomes: Object Mode

The solution is: 1. Select the edges you don't want to be subdivided Select edges

  1. In the right bar (Press N to show it) set the "Mean Crease" value to 1 (it sets how much the selected edges don't react to subdivision smoothness Edit: note that the face is still subdivided but the subfaces created by subdivision mantain the original position. No smoothness.). They'll become violet. Edge crease

  2. Turn back to Edit Mode and enjoy Works!

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    $\begingroup$ Edge crease, awesome! Didn't know this was a feature, but it's very useful to know, thanks. $\endgroup$ – Dan Feb 1 '17 at 16:01
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    $\begingroup$ It's worth mentioning that the topology still gets subdivided, it just uses simple subdivision instead of smooth subdivision. ;-) $\endgroup$ – Mentalist Feb 2 '17 at 5:21
  • $\begingroup$ Yes! Right! I just edited the post adding that information. Thank for the advise. :-) $\endgroup$ – mugnozzo Feb 2 '17 at 18:03
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    $\begingroup$ Another solution would be to use supporting loopcuts in that area (i.e. to run a loopcut along selected faces on screenshot). This will create smooth transition (and add more geometry which is always a choice) $\endgroup$ – Mr Zak Feb 2 '17 at 18:11
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To solve this:

  • I had a cube with subdivision done to it as shown below:

enter image description here

  • Let's say I don't want the upper face to be subdivided. First switch into edit mode and choose face selection as shown below:

enter image description here

  • Select the upper four faces which you want to be one face as shown below:

enter image description here

  • Go to the mesh menu, then Faces, then Make Edge/Face as shown below:

enter image description here

  • Then they will be back into one face again as shown below:

enter image description here

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    $\begingroup$ This cannot be used if one doesn't want to apply the Subdivision Surface modifier, leaving it unapplied in the modifier stack. $\endgroup$ – mugnozzo Feb 1 '17 at 14:01

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