How do I display a mesh with curved lines? I sometimes see relatively low-poly meshes displayed with the lines between the nodes curving to the surface of what I assume to be a subsurfed form. I uploaded a few images to imgur that I found on google that indicate what I mean:



Notice the line coming from the temple and curling around the ear, as well as the vertical lines on the back of the neck.



Look at the vertical lines coming from below the armpits up across the pectoral muscles and the lines running from the shoulders down the arms at the spaces between the deltoids and biceps.

Hopefully, I'm communicating what I mean properly. Anyways, I wanted to know how I can enable these curves.
In Blender, this is the result of checking 'Wire' and 'Show All Edges' in the Object tab > Display panel, while also checking 'Optimal Display' in a Subdivision Surface modifier.