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I wanted to know if it's possible to rotate a part of a mesh around a point? A bit like what the spinning tool is doing but for the selected vertices of an existing mesh.

For example on the image below, how could I spin this selected vertices around the 3D cursor in order to have a nice curve like on the object on the left?

Thanks a lot!

enter image description here

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    $\begingroup$ Yuu can use the warp tool, the selected faces will curve using the 3d cursor as the radius (blender.stackexchange.com/a/21707/1853). For other forms of deformation read this related post: how to curve my mesh $\endgroup$
    – user1853
    Commented Jul 9, 2018 at 6:06
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    $\begingroup$ I reccommend the 'simple deform' modifier set to 'bend' using an empty as origin of rotation. $\endgroup$
    – Yvain
    Commented Jul 9, 2018 at 6:50
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    $\begingroup$ Consider a curve modifier. blender.stackexchange.com/questions/91902/modeling-a-ball-gear/… $\endgroup$
    – atomicbezierslinger
    Commented Jul 9, 2018 at 7:15
  • $\begingroup$ ¿Are you stating you want this mechanism to generate vertices or NOT to generate vertices? Spin tool generates. Some others do not. ❓ $\endgroup$
    – atomicbezierslinger
    Commented Jul 9, 2018 at 7:18
  • $\begingroup$ Yes, non generative - thanks to everybody I could solve it with the SimpleDeform modifier as suggested by some people! $\endgroup$
    – drn
    Commented Jul 9, 2018 at 8:59

2 Answers 2

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In these illustrations, the track to be deformed is lying in the XY plane, Y up, X across.

You can use the spin tool to generate new geometry: extend your object around an arc of a circle, by selecting the top row of existing vertices, and AltR spinning them. In the Tool region, set the Axis to (0,0,1), the Angle to 90 degrees, and the Center to the center of the circle from which the arc is taken. (The empty in this illustration is just to show roughly where the center is)

enter image description here

But it's hard to adjust the center without constructing guidelines, and destructive. It's probably easier to use Simple Deform > Bend, with these settings, and an empty oriented and placed as shown:

enter image description here

That example uses the 'Limit' setting to restrict the deformation to the halfway point in the track's X, in the empty's space. You may need to slide that up and down, depending on the extent of your track in the empty's X.

Or...

enter image description here

.. you can restrict the deformation to a vertex group. (The angle setting becomes a bit counter-intuitive)

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  • $\begingroup$ Thank you so much! Exactly what I was looking for. Didn't know this SimpleDeform modifier yet, I learned a new valuable things in Blender today :) $\endgroup$
    – drn
    Commented Jul 9, 2018 at 9:00
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enter image description here

The spin tool affects only the current selection.

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