For making bicubic patches you should consider the Spatch modeller. It's
specially designed for making bicubic patches (and triangle meshes).
http://www.cableone.net/alyson/spatch.html
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
