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.