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Probably really simple answer, but I can't seem to find any info about how to make a face concave.

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    $\begingroup$ Concave like this? $\endgroup$
    – gandalf3
    Nov 15, 2015 at 22:47
  • $\begingroup$ Yeah that's exactly it. $\endgroup$
    – lakerice
    Nov 15, 2015 at 23:10

2 Answers 2

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Another way you can do this is with Proportional Editing (O):

enter image description here

Steps taken in the gif

  1. Add a cylinder (⇧ ShiftA> Mesh > Cylinder)
  2. Enter Edit Mode (↹ Tab)
  3. Select the top and bottom faces (⎈ Ctrl↹ Tab> Face to set the selection mode, then ⇧ ShiftRMB RMB to select)
  4. Inset (I)
  5. Select just the top face and inset again (I)
  6. Add loopcuts (⎈ CtrlR, then MW MW to adjust number of cuts)
  7. Select the middle ngon
  8. Turn on Proportional Editing (O) and set the falloff type in the header
  9. Move the face down on the Z axis (G, Z. Use MW MW to adjust the falloff)
  10. Add a subsurf modifier (⎈ Ctrl1, where 1 refers to the number of subdivisions in the modifier. Can be any digit from 1 to 5)
  11. Add supporting loopcuts (⎈ CtrlR) to control the subsurf.
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  • $\begingroup$ @gandalf3♦ hahaha! I feel like a clairvoyant right now. After posting my answer I knew that you come with a better solution and take back my 'accept' points. Premonition came true :). $\endgroup$
    – Paul Gonet
    Nov 16, 2015 at 1:04
  • $\begingroup$ @Gonzou o.O haha. I nearly didn't answer after I saw your creative solution, but I figured I'd write something anyway since, well, two answers are better than one :) $\endgroup$
    – gandalf3
    Nov 16, 2015 at 1:25
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Add a Cylinder with NGon cap fill type. Select the upper edge loop with Alt+RMB, then press Ctrl+B to bevel it. Set the bevel Segments number as desired. Next select the edge loop as pictured below, snap the cursor to it (Shift+S-->Cursor to Selected), select the other edge loops towards the top and press S, Z, -1. Add some loop cuts with Ctrl+R to sharpen the edges (if you wish to add a Subsurf Modifier in the next step). enter image description here

Now add the Subsurf Modifier and set the desired subdivisions number. enter image description here

Smooth the faces clicking on the Smooth button in the Edit panel of the Tool Shelf (T). enter image description here

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