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I am wonder if is there a trick in blender to transform this "cubit" cylinder to a "circle" cylinder? I created the cylinder with only 16 vertices, in edit mode I subdivided for 3 times, now this is the result. I know that the right way is to apply subdivision surface, but I am wonder if it is possible to transform the hexagonal vertices to a perfect circle.

enter image description here

Here it the blend file:

https://drive.google.com/file/d/1Lzy8QVktv-BLOQb22_fA-mJ12VbM7H_H/view?usp=sharing

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As an alternative to @moonboots In this case you could use the free looptools plug-in (enable in preferences). Select all the edge rings, and select circle in the looptools options list, see below

From: enter image description here

To: enter image description here

In future, when you subdivide a mesh like this and want it to be smooth after subdividing in edit mode, go with: select all edges, edges (dropdown menu) > subdivide > smoothness to 1

See below: enter image description here

I hope this helps

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A couple of alternatives to @moonboots' perfectly good answer..

  • The Subdivide operator has a 'Smooth' option in its F9 panel. If that had been set to 1, your cylinder would have been circular when you subdivided it.
  • The Cast modifier, 'Cylinder' option. This works only in local space, and will not be affected by any rotation of an 'Object' you may select to be its transform origin. So it only works if the modified object's Z is from end to end of the cylinder, and the modifier is set to deform in X and Y. Pretty useless. You could write a better one in Geometry Nodes.
  • Loop Tools > Circle on all around-loops, selected.
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Select all the circle edges (to make it quick, select an edge ring then Select > Select Loops > Edge Loops), choose Transform Pivot Point > Individual Origins, then AltShiftS > To Sphere and drag (go into the Operator box if you want to make sure it is at 1):

enter image description here

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