I made the floor on my irtc entry
http://www.irtc.org/ftp/pub/stills/2005-06-30/untitled.jpg using isosurfaces

#macro adoquin (rs_brick)
#local rnd_ad= seed(rs_brick) ;
     isosurface {
            function{f_rounded_box(x,y,z,0.15,1.75*gr,1.75,1.75)-

(f_bozo(x*1.85*gr+rs_brick,y*1.85+rs_brick,z*1.85-rs_brick)*0.3)
                     }
            threshold 0
            contained_by {box {<-2*gr,-2,-2>,<2*gr,2,2>}}
             max_gradient 1.358
            scale .5
            }
#end
 perhaps you could find it useful
--
light_source{0,1}#macro C(r,p)cylinder{x*-2,x*2,.9 pigment { rgb
p} /* B Gimeno estoeslarealidad */ rotate p*90 } #end difference
{box {-1,1} C(z /* http://usuarios.lycos.es/game2413 */,x)C(x,y)
C(z,z) pigment{rgb 2} rotate 45 translate z*4} // www.povray.org

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