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I saw a cryengine video in which an edge loop is dragged to adjust it just like the ones in paint. I am not sure if that feature is available in Blender. If yes, would greatly help in modelling objects like bridges, arches etc. The link to the video: https://m.youtube.com/watch?v=0X123xPlyWM the curve is used in 00:18 of the video.

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  • $\begingroup$ As well as the answers here, you might want to look at the Loop Tools add-on, Curve option. But I think its usefulness is pretty restricted. $\endgroup$ – Robin Betts Apr 15 '18 at 21:45
  • $\begingroup$ You can create a curve and adjust it with Blender possibilties, then cut the main mesh with that curve by using Knife Project $\endgroup$ – Mr Zak Apr 15 '18 at 22:18
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Anyone who lands here from a search engine, in Blender 2.8, Alt + C doesn't do anything. Curve from Mesh is not even available in the space bar menu. You have to select it from Object > Convert to menu.

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Unfortunately, blender doesn't have a magic button that can do this so you have to do it manually.

  1. Select the edge loop and press Shift+D and Esc to put it back
  2. Press P, seperate by selection
  3. Select the new mesh and in object mode, press Alt+C and choose Curve from Mesh/Text
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  • $\begingroup$ I don't use a keyboard, so what is Alt+C? $\endgroup$ – TimSim Nov 3 '19 at 8:43
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    $\begingroup$ Anyone who lands here, this is the correct answer, but in Blender 2.8, Alt + C doesn't do anything. Curve from Mesh is not even available in the spacebar menu. You have to select it from Object > Convert to menu. $\endgroup$ – dotNET Jan 4 at 10:36
  • $\begingroup$ @dotNET - I would almost go as far as suggest you move this comment into an answer in it's own right. Almost every link I followed when looking for "edge-to-curve" resulted in the alt+C method which is useless in blender 2.8+. This is the only suggestion I've found that works. Thank you and consider moving to answer. I for one, will upvote immediately to help spread the new "correct" method. $\endgroup$ – Christopher Bennett Jun 9 at 14:44
  • $\begingroup$ @ChristopherBennett: Thanks. Done. $\endgroup$ – dotNET Jun 9 at 15:29
  • $\begingroup$ It's so dumb that they remove this command from the search bar $\endgroup$ – Christian William Jul 21 at 0:01
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The nearest to that functionality would be Proportional Edit - simply select the edge loop in the middle of the structure (rather than the edge), enable Proportional Edit, use Grab (G) and adjust the radius (middle mouse wheel).

proportional edit

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