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enter image description here

Another question I want to ask is how do you extrude to both directions on the same axis?

Duarte Farrajota Ramos
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Inkplay_
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    Keep in mind that geometry to be curved must have enough subdivisions. In the case of the shown mesh long faces in the center have to be subdivided at least once. – Mr Zak Jun 11 '17 at 18:48
  • Loosely related: https://blender.stackexchange.com/questions/36291/good-approach-to-make-planks-for-a-barrel – Paul Gonet Jun 11 '17 at 20:35
  • @luke chen To extrude in both X and Y axes only first select the loop of faces (Alt+RMB) and press E. Cancel operation with RMB, then press S,Shift+Z. – Paul Gonet Jun 11 '17 at 22:28

2 Answers2

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  • USING PROPORTIONAL EDITING

Add some edge loops (Ctrl+R) in the middle of the object to devide the object evenly. Select the face loop in the middle (Alt+RMB) and snap the cursor to it (Shift+S-->Cursor to Selected). Enable proportional editing, then press S,Shift+Z to scale along X and Y axes only. enter image description here

  • USING SIMPLE DEFORM MODIFIER (STRETCH)

Give the object a Simple Deform modifier, change its mode to Stretch and adjust the deform factor as you like.
enter image description here

  • USING LATTICE MODIFIER

Add a Lattice, scale it to fit the object's size and subdivide it a few times. Select the object and give it a Lattice Modifier. Select the points around the middle subdivision of the lattice, then scale them with S. NOTE: Adding more subdivision to the lattice allows you to better control the shape of the object (you can make it more uneven/realistic).
enter image description here

Community
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Paul Gonet
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And there's, too, the Object Mode with Alt C. Proportional editing is used when, in the first place, symmetry is required. Alt C is more flexible.

Lukasz-40sth
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