/*

Problem description : a visible whitish line appears at the edge of a
transparent container box for media. Problem disappears if you change
the scene too much but it seemed to be reasonably stable as long as I
kept the camera location, look_at and the box edge aligned in
x-coordinate. The line does not appear in front of background nor
sky_sphere.


Philippe Debar phd### [at] yahoofr


Sys info :
POV-Ray 3.5 b7
Win 2k pro sp2
Ahtlon 1.2 GHz
512 MB DDR

*/


global_settings{assumed_gamma 1}

camera{
  location <1, 1.7, -5> // not tied with a 0 in x, y or z
  direction 1.5*z
  look_at <1,.4,2.5>
}

box{
  0,1 rotate 50*y
  scale <1,3,3> // does not affect the line very much
  translate <1,.01,.2> // in my experiments the line appeared as long as the
translate x is the same as the camera location x
  rotate 5*x // rotate in y or z makes the line disappear
  hollow
  texture{
    pigment{color rgbf 1} // rgbt shows the line too
  }
  interior{
    media{   // media is needed
      scattering{1, <.1,.9,.2>}  // also works with emission and absorption
    }
  }
}

plane{y, 0 texture{pigment{ rgb .6}} } // line shows on plane and sphere,
not on background
sphere{<.8, 0.75, 1.5>, .75 texture{pigment{ rgb 0}}}

light_source{<5, 10, -20> rgb 1.5}

#background{color rgb .2*x}
sky_sphere{pigment{ rgb .1*z}}

// end of scene

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