Summary edit

Licensing edit

I, the copyright holder of this work, hereby publish it under the following license:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

POV-Ray code edit

Below is the code for rendering the above image using the Persistence of Vision Raytracer:

/*
================================================
Magnetic domain bubbles, "squeezed down" in size
------------------------------------------------
Created by Søren Peo Pedersen - see my user page
at http://da.wikipedia.org/wiki/Bruger:Peo
================================================
*/

#declare MagnetFont="arialbd.ttf" // Font for the "N" and "S" nomenclature on magnets
#declare NorthLtr="N";  // Letter to indicate north pole
#declare SouthLtr="S";  // Letter to indicate south pole

#declare MagLayerUp=pigment {  // Gradient with white
  gradient y                   // south pole side facing up
  color_map {
    [0.0 color rgb <1,0,0>]
    [1.0 color rgb <1,1,1>]
    }
  scale .000602
  translate -.000301
  }

#declare MagLayerDn=pigment {   // Gradient with red north
  gradient y                    // pole side facing up
  color_map {
    [0.0 color rgb <1,1,1>]
    [1.0 color rgb <1,0,0>]
    }
  scale .000602
  translate -.000301
  }

box {<-4,-.3,-4>,<4,.3,4> // The orthomagnetic sheet itself
  pigment {
    bumps         // "Random" pattern formed by the domains
    pigment_map {
      [0.0 MagLayerUp]  // A majority of 0.7 x 100% = 70% of the
      [0.7 MagLayerUp]  // surface has a south pole facing upwards, and
      [0.7 MagLayerDn]  // a minority of 0.3 x 100% = 30% of the surface
      [1.0 MagLayerDn]  // (the "bubbles") has north poles facing up.
      }
    scale <1,1000,1>  // Stretch so boundaries seem
    }                 // orthogonal to the surface
  finish {ambient .5} // Softens the self-shadows
  }

// Magnets to "squeeze" bubbles down in size:
box {<-4,3.5,-4>,<4,30,4> // The big north pole above the sheet
  pigment {
    object {
      text {ttf MagnetFont,NorthLtr,3,0 // with the letter for "north" on it
        scale 10 translate <-3,4,-30>
        }
      pigment {color rgbt <1,0,0,.9>}  // High degree of transparency (0.9)
      pigment {color rgbt <1,1,1,.9>}  // to hint that the field is weak
      }
    }
  finish {ambient .5}
  }

box {<-4,-79,-4>,<4,-4.5,4> // The big south pole below the sheet
  pigment {
    object {
      text {ttf MagnetFont,SouthLtr,3,0 // with the letter for "south" on it
        scale 10 translate <-3,-12,-30>
        }
      pigment {color rgbt <1,1,1,.9>}  // High degree of transparency (0.9)
      pigment {color rgbt <1,0,0,.9>}  // to hint that the field is weak
      }
    }
  finish {ambient .5}
  }

background {color rgb 1}  // White background

camera {  // View it all ...
  location <8,5,-10> // ... from this location
  look_at <0,0,0>     // ... looking towards this point
  up <0,4/3,0> right <1,0,0> // Force 4/3 "portrait" aspect ratio
  }

light_source {    // light source
  <-100,150,-120> // to illuminate
  color rgb 1     // the scene
  }