Surface Visualization command
Use the Surface Visualization command 
 to display the UV Mesh and curvature combs on a selected surface as defined in the               dialog settings box. The UV Mesh or Isoparameter curve mesh are lines running along               the surface in the U and V directions, showing the shape of the surface. The curvature               comb shows the smoothness of a curve on the surface.
The following illustration shows U direction labeled as 1 and V direction labeled as 2.
            The following illustration shows the curvature combs labeled as 3 for direction 1 and 2 respectively.
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