"ingo" <ing### [at] homenl> wrote in message
news:Xns### [at] povrayorg...
> in news:3ba0c9b8@news.povray.org Tom Melly wrote:
>
> > Although correct, wouldn't this be better as:
> > [...]
> >   function  {y - FBozo(x,0,z).gray }
> >
>
> Why?
>

Because, and I may be doing something stupid, the following does not actually
render anything as far as I can see...

#declare fn_floor= function{pigment{bozo color_map{[0 rgb 0][1 rgb 1]}}}
isosurface {
  function {fn_floor(x,y,z).gray}
  max_gradient 7
  contained_by {box{<-10,-10,-10>,<10,10,10>}}
  accuracy 0.1
  evaluate 1, 1.2, 0.99
  pigment{rgb 1}
  finish{ambient 1}

}

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