Note: I did not test this code, I actually made an isosurface with this
function:
function {y - 5*(sin(x/3) + sin(z/3))}
and a threshold of 0. Of course, this requires the Superpatch.
This has been tested:
union {
 #declare X=-50;
 #while (X<50)
   #declare Z=-50;
   #while (Z<50)
     sphere { <X,5*(sin(X/5) +sin(Z/5)),Z>,1 pigment {color Yellow}}
     #declare Z=Z+1;
   #end
   #declare X=X+1;
 #end
 scale 0.1
}

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