3D scale bar for mesh/surf?

I can't seem to find s scale-bar-making function in MATLAB. I need it for a mesh that I made with dimensions in millimeters. Can anyone help me with this please? I want it to be something like this:

Answer 1

[Mike Garrity]

You could start with something like this:

function scalebar(xc,yc,zc, w, label)
  x = [xc, xc-w, nan, xc, xc  , nan, xc, xc  ];
  y = [yc, yc  , nan, yc, yc-w, nan, yc, yc  ];
  z = [zc, zc  , nan, zc, zc  , nan, zc, zc+w];    
  hl = line(x,y,z);
  hl.LineWidth = 2;
  ht = text(xc,yc,zc,[num2str(w), ' ', units]);
  ht.FontSize = 18;
  ht.Color = hl.Color;
  ht.VerticalAlignment = 'bottom';

The nans are to insert breaks in between the individual line segments.

I can use it like this:

[x,y,z]=peaks;
surf(x,y,z)
scalebar(-.1,1.4,8.5, 2, 'Feet')

to get this:

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