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Where did the second (internal) sphere come from?
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Attachments:
Download 'Sphere02.jpg' (107 KB)
Preview of image 'Sphere02.jpg'
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"Bill DeWitt" <bde### [at] cfl rrcom> wrote in message
news:3b9e757a@news.povray.org...
>
> Where did the second (internal) sphere come from?
Oh, here's the code...
//////////////////////////////////////////////
// Pov-Ray Scene File ///
////////////////////////////////////////////
// File: Sphere02.pov
// Vers: 3.5
// Desc:
// Date:
// Auth: Bill DeWitt
/////////////////////////////////////////////////
#declare camera_right = <-4/3, 0.0, 0.0 >;///
#declare camera_up = < 0.0, 1.0, 0.0 >;///
#declare camera_direction = < 0.0, 0.0, 1.0 >;///
#declare camera_location = < 0.0, 10.0, 20.0 >*0.75;///
#declare camera_look_at = < 0.0, 0.0, 0.0 >;///
////////////// Camera //////////////////////////
camera { ///
right camera_right ///
up camera_up ///
direction camera_direction ///
location camera_location ///
look_at camera_look_at ///
} ///
////////////// end Camera //////////////
/// ///
/////////////// Light ////////////////// // An area light (creates soft
shadows)
// WARNING: This special light can significantly slow down rendering times!
light_source
{
0*x // light's position (translated below)
color rgb 1.0 // light's color
area_light
<8, 0, 0> <0, 0, 8> // lights spread out across this distance (x * z)
4, 4 // total number of lights in grid (4x*4z = 16 lights)
adaptive 0 // 0,1,2,3...
jitter // adds random softening of light
circular // make the shape of the light circular
orient // orient light
translate <40, 80, 40> // <x y z> position of light
}
///////////////////////////////////////
#include "GraphPaper.mcr"
object { GraphPaper( 10, 5, -2 ) scale 3 } // range increments origin
sphere { 1,5
pigment { hexagon rgbt 1, rgb 0.8, rgb 0.5 scale 0.5 turbulence 0.0
scale < 1.0, 0.25, 1.0 >
} // end pigment
normal { bozo 0.5 scale 1 turbulence 0.5 }
normal { bumps scale 0.2 turbulence 1 }
}
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What sphere? ;)
>
> Where did the second (internal) sphere come from?
>
> [Image]
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org/
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"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote in message
news:3B9E7794.E79329B9@ignorancia.org...
> What sphere? ;)
Oddly enough, I scaled the hexagon a little differently and the second
sphere is gone.
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"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote :
>
> What sphere? ;)
Oops... Now I see what you mean. I'll just go about my normal daily
business now...
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Looking at your picture, at first it looks like a sphere, but after a closer
look, I noticed that it actually is "a band" of the lighter hexagons
displaying on the near side of the sphere.
"Bill DeWitt" <bde### [at] cflrrcom> wrote in message
news:3b9e757a@news.povray.org...
>
> Where did the second (internal) sphere come from?
>
>
>
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Hey, this is actually quite cool - in a weird way
;oD
- Nekar
"Bill DeWitt" <bde### [at] cflrrcom> wrote in message
news:3b9e757a@news.povray.org...
>
> Where did the second (internal) sphere come from?
>
>
>
Post a reply to this message
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Wasn't it Bill DeWitt who wrote:
>> Where did the second (internal) sphere come from?
It's quite a neat optical illusion. The three stretched light grey
hexagons at the front of the sphere just happen to look the same shape
that you would see if there were a small sphere inside the larger one.
Here's a simplified source file that maintains the effect. (So that
people who don't have "GraphPaper.mcr" can play with the source code,
and won't be distracted by all the other stuff that are not actually
involved in the illusion.
background {rgb 1}
camera {location <0,10,20 > look_at 1 angle 40}
light_source {<40, 80, 40>, colour rgb 1}
sphere { 1,5
pigment { hexagon
rgbt 1,
rgb <1,0,0>,
rgb <0,1,0>,
scale 0.5
}
}
To dispel the optical illusion, try replacing the "rgbt 1" with "rgb 1".
The sphere is now opaque, and the three patches that looked like an
inner sphere are now clearly seen to be on the surface of the outer
sphere.
--
Mike Williams
Gentleman of Leisure
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>
> "Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote :
> >
> > What sphere? ;)
>
> Oops... Now I see what you mean. I'll just go about my normal daily
> business now...
So, you did it accidentally? Great! Seems like carefully planed... :)
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org/
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"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote in message
news:3B9FD801.9742AE9E@ignorancia.org...
> >
> > "Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote :
> > >
> > > What sphere? ;)
> >
> > Oops... Now I see what you mean. I'll just go about my normal daily
> > business now...
>
> So, you did it accidentally?
Man! I should have kept my mouth shut after the first post.
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