I want to make a plane of one unit checkers each of which is made up of
 1 / 12 scale checkers .

How do I do that ?

Got lots to learn . Amazing program .

Bob A

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"Bob Armstrong" <bob### [at] cosycom> wrote:
> I want to make a plane of one unit checkers each of which is made up of
>  1 / 12 scale checkers .
>
> How do I do that ?

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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Wasn't it Bob Armstrong who wrote:
> I want to make a plane of one unit checkers each of which is made up of
> 1 / 12 scale checkers .
>
>How do I do that ?
>
>Got lots to learn . Amazing program .

With plain coloured pigments:

#include "functions.inc"
  pigment {
    function {0.5*f_checker(x,y,z)+0.25*f_checker(x*12,y*12,z*12)}
    colour_map {
      [0    rgb 0]
      [0.25 rgb x]
      [0.5  rgb y]
      [0.75 rgb z]
    }
  }

With complete textures

#include "functions.inc"
  texture {
    function {0.5*f_checker(x,y,z)+0.25*f_checker(x*12,y*12,z*12)}
    texture_map {
      [0    T_Stone1]
      [0.25 T_Stone10]
      [0.5  T_Stone2]
      [0.75 T_Stone6]
    }
  }

-- 
Mike Williams
Gentleman of Leisure

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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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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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Bob Armstrong wrote:
>  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 .

checker does either take two colors (as in your first example), or two 
pigments. Your second example is one full pigment and one color, but 
that's not valid. You can replace the color with a full pigment 
statement and it should work:

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


HTH,
Florian

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