#declare Ball = 
  sphere{ <0,0,0>,0.25 scale <1,1,1>
          texture { pigment{ color rgb<1,0.05,0>}
                    finish { phong 1}
                  }
          rotate<0,0,0> translate<0,0,0>
        }

union{ //-----------------------------------------
 #local NrX = 0;     // start x
 #local EndNrX = 5; // end   x
 #while (NrX< EndNrX) 
    // inner loop
    #local NrZ = 0;     // start z
    #local EndNrZ = 10; // end   z
    #while (NrZ< EndNrZ) 
     
      object{Ball translate<NrX*0.75, 0, NrZ*0.75>} 

    #local NrZ = NrZ + 1;  // next Nr z
    #end // --------------- end of loop z
    // end inner loop
 #declare NrX = NrX + 1;  // next Nr x
 #end // --------------- end of loop x
 // end of outer loop

rotate<0,0,0> 
translate<-1.5,0,0>
} // end of union ---------------------------------