How can I make a kind of napkin (twirl, pleating, vortex) whirl kind of extrude effect?

At its simplest it's like twirling a napkin or piece of paper from the center where alternate edges rise.

If a picture's worth 1000 words, this kind of effect:

There's already a flat spiral example here:

How can I make a flat, spiralled surface?

As I'm envisioning it, for example, the red twirls would be raised.

I've seen comparable examples on cylinders, but not on surfaces (square or circular) - like a pleated dress for example, or a curly cone, but not a flat surface.

Is that enough info?

Tried simple deform and proportional editing, but I keep missing the mark. Maybe they're key to the result or not.

At its simplest, this is a selection problem.

• Create mesh Circle, 'Triangle-Fan', with an even number of segments, in XY.
• Select the central vertex, and CtrlShiftB - drag Bevel it, to make all faces quads.
• CtrlR cut in some subdivisions of the radial edges, as below.

• Using O, Proportional Editing, select the central face, and RZ rotate it, which should drag all the other vertices in the radius of your prop. edit into a spiral.
• Select 2 sections of radial edges, in the same ring, 1 edge apart, as just visible in the central image, below.
• CtrlShiftNumpad + Select Next Active, to select every other radial edge in 1 ring.
• Header Menu > Select > Select Loops > Select Edge Loops to select every other radial edge, as show in the last picture, below.

Now you can GZ, RZ.. raise, tuck the pleats.

If you wanted to, using a similar selection method to the one used for the spokes, you could select every other edge-ring, to delete those. Or, think ahead, and delete them before all the twisting, etc.

The finished example, here, has a Solidify and Bevel modifier.

• "Select 2 spoke sections at the same radius, 1 spoke apart" is confusing to me, please clarify. Commented Jul 31, 2021 at 15:47
• This method works with the example, but, doesn't seem to work as well with a less circular shape like a square, polygon, or hexagon. I know that's not what I asked for. Commented Jul 31, 2021 at 15:55
• Ctrl-Shift-B doesn't seem to work for me. I must be doing something wrong. I get a gloopy mess. Doesn't matter whether I choose percent, width, offset, any of the options - same result. Commented Jul 31, 2021 at 16:02
• Found this that helped with "Ctrl-Shift-B: blender.stackexchange.com/questions/39512/… Commented Jul 31, 2021 at 16:27
• Under O rotate the central face is also confusing. There's no explicit "rotate the central face" option. Commented Jul 31, 2021 at 16:36

I would try it like this:

create a circle, use twice as many points you will need and then press F3 and find "checker" use this option, it will deselect every second vert

Then you can use E and S to extrude it to middle

Next you want to subdivide your edges as much as possible

Now use proportional editing , select middle vertices and rotate it around Z axis to make spiral:

and now you want to Extrude all vertices you want to be solid like in picture, extrude with E and rotate around Z axis till you get your shape... After that it is only about rotating and moving vertices... I ended up with this and I think it is usable:

• Yours is easier to follow and I think, simple, but Robin's is closer to spot on to the example. Commented Jul 31, 2021 at 15:38