"Will W" <wil### [at] NOSPAMwizzardsnet> wrote in
news:3e888420@news.povray.org: 

...
>> Why don't you just scale down the pigment that
>> is going to be used in the mapping (prior to
>> the mapping).
>>
>> E.g.:
>> If it is an image map, then you first translate
>> the image map pigment so that it is centered at
>> the origin, scale it and then translate it back.
> 
> For a one-shot, that would be acceptable to me. For a tool that I want
> to use over and over again, and share with others, it is not. Either
> the macro handles uv_mapping in the normally expected way, or it gets
> an attached disclaimer that says uv_mapping is only supported to a
> limited degree. 

OK, but you could have let a macro do the necessary adjustments
to the pigment.


An alternative is to change your uv_vectors to this:

<C-1, R-1>/<Cols-1, Rows-1>,
<C  , R-1>/<Cols-1, Rows-1>,
<C  , R  >/<Cols-1, Rows-1>,
<C-1, R  >/<Cols-1, Rows-1>


To see the effect, uncomment your clipped_by statement, and use
these statements:

union {
  sphere { <-5, -0, -5>, 0.1 }
  sphere { < 5, -0, -5>, 0.1 }
  sphere { < 5, -0,  5>, 0.1 }
  sphere { <-5, -0,  5>, 0.1 }
  pigment { color rgb <2, 2, 2> }
}

light_source { <-1, 2, -2>*100 rgb <1, 1, 1> }

background { color blue 1 }

camera {
  orthographic
  location 12*y
  look_at 0*y
}

object {
  bigPatch(<-5, 0, -5>,<5, 0.02, 5>, PiThing)
  texture {
    uv_mapping
    pigment {
      object {
        box { <0, 0, 0>, <1, 1, 1> }
        color red 1
        color green 1
      }
    }
/*
    pigment {
      image_map {
        png "test"
//        png "mtmandj"
        once
        interpolate 2
      }
    }
*/
  }
}


Tor Olav

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