You can also use this function I developed that's handy for checker-based
textures:

#declare smoothcheckerbasis = function (x,y,z,allfloors,xv,yv,zv) {
 select(allfloors-floor(allfloors/2)*2,
  0,
  max(xv-.5,yv-.5,zv-.5, .5-xv,.5-yv,.5-zv),
  min(xv+.5,yv+.5,zv+.5, 1.5-xv,1.5-yv,1.5-zv)
 )
}
#declare smoothchecker = function (x,y,z) {

smoothcheckerbasis(x,y,z,floor(x)+floor(y)+floor(z),x-floor(x),y-floor(y),z-
floor(z))
}


Use it like:

function {smoothchecker(x,y+.5,z)}

(translated by .5 units to show the interesting part on the X-Z plane)

 - Slime
[ http://www.slimeland.com/ ]

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