"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> The 1/7 value is the grout width value. The tile is 6/7 units and the grout is
> 1/7 units.
>
> Use declare and math to adust tile/grout sizes:
>
> #declare TilSiz= <xdim,ydim,0>;  //tile offsetting (tile size plus grout line)
> #declare GrtSiz= gwid; //grout width
>
> texture {
>     pigment { uv_mapping
>       gradient x
>       pigment_map{
>         [GrtSiz/(TilSiz.x+GrtSiz) rgb 1]
>         [GrtSiz/(TilSiz.x+GrtSiz) gradient y
>           colour_map{
>             [GrtSiz/(TilSiz.y+GrtSiz) rgb 1]
>             [GrtSiz/(TilSiz.y+GrtSiz) rgb <.6,.6,1> ]
>           }
>         ]
>       }
>       scale TilSiz
>     }
>     finish { basic_finish }
> }
>
> This way you can make the tiles bigger (change TilSiz) without changing the
> grout size, or vice versa.
>
> -tgq



when you said "The 1/7 value is the grout width value." , a light sort of went
on ... but there is y grout and and x grout.

the math for the correct y-grout-[scale] due to y-scaling is ... ? puzzling
 ".5" value which I guessed at, since it looked 2 times too big.

In the real Lego world this is what worked:

#declare TilSiz= <6/7,12/7,1>;  //tile offsetting (tile size plus grout line)
#declare GrtSiz= 1/7; //grout width
//0.142857
echof(GrtSiz/(TilSiz.x+GrtSiz))     // 0.14286
cr()
echof(GrtSiz/(TilSiz.y+GrtSiz))     // 0.07143
cr()
#declare tileplaid =
#if (10)
texture {
    pigment { uv_mapping
      gradient x
      pigment_map{
        [GrtSiz/(TilSiz.x+GrtSiz) rgb 1]
        [GrtSiz/(TilSiz.x+GrtSiz) gradient y
          colour_map{
            [GrtSiz/(TilSiz.y+GrtSiz) rgb 1]
            [GrtSiz/(TilSiz.y+GrtSiz) rgb <.6,.6,1> ]
          }
        ]
      }
      //scale TilSiz*.01
      scale <1/160,1/20,1>*.7
    }
    finish { basic_finish }
}
#else
texture {
    pigment { uv_mapping
      gradient x
      pigment_map{
        [1/7 rgb 1]
        [1/7 gradient y
          colour_map{
            [(1/7)*.5 rgb 1]
            [(1/7)*.5 rgb <.6,.6,1> ]
          }
        ]
      }
      scale <1/160,1/20,1>*.7 // ==  0.00625 / .05 = 0.125 1/8
    }
    finish { basic_finish }
} #end


still had to scale by something else not TilSiz
scale by TilSiz = a grout line half the pool's width and tiles with a greater
xdim

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