Playing with variations on this form , I guess there are
 issues of syntax and allowed elisions that I don't understand
 yet . When

  plane { z , 5
   pigment { checker
    < .6 , 1 , .6 > ,
    < 1 , .6 , 1 >  }
   }

 works , I don't see why

  plane { z , 5
   pigment { checker
    pigment { checker rgb 1 rgb  0 scale 1/12 } ,
   < 1 , .6 , 1 >  }
  }

 doesn't . I would naively expect a principle of substitution .

--

"Bob Armstrong" <bob### [at] cosycom> wrote:
> Thanks ,
>  I thought I tried something like that , I must have had some
>  minor error . Don't know what I got wrong .
> Thanks again .
>
> "jute" <nomail@nomail> wrote:
> > plane {
> >    y, 0
> >    pigment {
> >       checker
> >          pigment { checker rgb 1 rgb  0 scale 1/12 }
> >          pigment { checker rgb <1,0,0> rgb <0,0,1> scale 1/6 }
> >    }
> > }
> >
> > --
> > jussi

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