Difference between scale with S and Ctrl+A

I was watching this video.

After he adds the skin modifier he grabs the vertices on the end and scales them with Ctrl+A. I tried to do the scale with S but nothing happens. It only works with Ctrl+A. The menu options on both look the same. I tried searching the documentation but I couldn’t find anything on this topic. What is the difference between these two scaling modes?

It looks like CTRL A is just for adjusting the skin size. Helpful to know!

The mesh is still just vertices and edges if you turn of the skin. And you can’t scale a single vertex, it wouldn’t make sense, so you scale the skin (skin resize).

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Indeed, skin radius is a special vertex data layer. Its adjustment is documented here:

The mean value for current selection can also be adjusted in sidebar:


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