Wasn't it Xedi who wrote:
>Hello everyone, I'm new to Povray, and enjoying all the math in it.
>I would like to be able to apply a grid on a surface, similarly to this
>image :
>http://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Saddle_pt.jpg/600px-
>Saddle_pt.jpg

That sort of grid, where the grid is fixed in space rather than
following the surface, is easy. Compare this to the wiki image

camera { location  <4, 8, -4>*2 look_at <0, 0, 0> angle 10}
background {rgb 1}
light_source {<0,200,0> colour rgb 1}
                  
#declare T1 = texture {
 pigment {
   gradient x
   colour_map{[0.05 rgb 0]
            [0.05 rgbt <1,1,1,1>]
            [0.95 rgbt <1,1,1,1>]
            [0.95 rgb 0]            
            }
 }
 scale 0.1
}

isosurface {
  function { y+cos(x*pi)*0.2-cos(z*pi)*0.3} open
        max_gradient 1.5
        contained_by{box{ <-2,-0.6,-0.8><2,0.6,0.8>}}
        texture{pigment {rgb .9*y}}
        texture {T1}
        texture {T1 rotate y*90}
        texture {T1 rotate z*90 scale 2.1 translate y*0.1}
}

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