OK, I'm afraid to make a blunder!

But...
Look at the picture and the following source:

/////////////////////////////////////////
//+w512 +h512 +FN8

camera {
 perspective
 location <0,10,0>
 look_at <0,0,0>
 right x
 up y
 sky z
}

box {
  <-10000,0,-10000>, <10000,1,10000>

  pigment { rgb 0.6 }

  normal {
    //agate
    //granite
    wrinkles
    scale 0.2
  }

  finish {
    ambient 0.0
    diffuse 1.0
    specular 1 roughness 0.002
  }
}

light_source {
  <0,50,0>,
  rgb 1
}
/////////////////////////////////////////

Highlights in *Agate* and *Granite* are perfectly centered in the image.
The problem is in *wrinkles*:
that poor higlights has been confined to bottom left...

Why?

--
Carlo

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