This image shows how one kind of domain in the orthomagnetic sheet of magnetic bubble memory grows and the other shrinks, as an external magnetic field (the big magnet poles) is imposed on them.
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Self-made, using the Persistence of Vision Raytracer
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POV-Ray code
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
}
{{Information |Description=This image shows how one kind of domain in the orthomagnetic sheet of magnetic bubble memory grows and the other shrinks, as an external magnetic field (the big magnet poles) is imposed on them. |Source=Self-made, using the Pers