"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> "alphaQuad" <alp### [at] earthlinknet> wrote:
> > "Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> > > Slight problem with some grout scaling being off, try this instead:
> >
> > If there were any heads to be saved in Gefilte Fish jars for the future it would
> > be yours. "Danger danger Will 'Einstein' Robinson".
> >
> > "leet" brain waves there TQ
>
> Well thanks...
>
> As long as it all works out for you and we both learned something.  I always
> take these things as a challenge to teach myself how to do something and
> hopefully learn something.
>
> -tgq

I was playin with your first one, check it out:



#declare TilSiz=<6/7,12/7,-4>;    //Size of tile (x,y)
#declare scal = (1-TilSiz)*TilSiz/34.85;
#declare Grt=1/7;

#declare TQ_tile =
pigment { uv_mapping
  gradient x
  pigment_map{
    [Grt/(TilSiz.x+Grt) rgb 1]
    [Grt/(TilSiz.x+Grt) gradient y
      colour_map{
        [Grt/(TilSiz.y+Grt) rgb 1]
        [Grt/(TilSiz.y+Grt) rgb <.6,.6,1> ]
      }
    ]
  }
  //scale <scal.x,abs(scal.y),1> // = different image
  scale scal // negative y-scale
  //scale <1/160,1/20,1>*.7
}

echov((1-TilSiz)*TilSiz*0.0287) // <0.00351,-0.03514,-0.57400>
cr()

echov((1-TilSiz)*TilSiz/34.85) // <0.00351,-0.03514,-0.57389>
cr()
echov(<1/160,1/20,1>*.7)   // = <0.00437,0.03500,0.70000>
cr()

#declare pool_box2 =
difference {
    box { <-8, -66.5, -8> <232, 0, 232> } // legoworld hole  +8
    box { <0, -65, 0> <224, 1, 224> }
    texture { TQ_tile basic_finish }
    translate <-8,0,-8>
}
object { pool_box2 translate y*4 }

how/why is negative -scale is OK?

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