Here's one of my attempts to get a globe vaguely like NASA's Blue Marble
image
at http://earthobservatory.nasa.gov/Newsroom/BlueMarble/

Suggestions welcome!

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"PM 2Ring" <nomail@nomail> wrote:
This engraved glass globe was done using normals... and a little dispersion.

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Here's another one in glass with dispersion, this time with photons & area
lights. I don't care if those streaks are artifacts, I think they add
character... :)

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PM 2Ring nous apporta ses lumieres en ce 2005-04-07 13:40:
> Here's another one in glass with dispersion, this time with photons & area
> lights. I don't care if those streaks are artifacts, I think they add
> character... :)
> 
> 
> ------------------------------------------------------------------------
> 
I must agre with you ;)

Alain

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PM 2Ring wrote:
> This engraved glass globe was done using normals... and a little dispersion.

Very nice. Is it possible to get the source or a bigger version for 
destop background?

Greetings,

Bonsai

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<--------------------------->
    ___ __ __  _ ___ ___  _
   | _ )  \  \( )  _) _ )( )
   | _ \() |\ \ |\ \/ _ \| |
   |___/__/_)\__)___)/ \_)_)

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Very cool.  Inspired me to try it myself.  Lots of tricky settings that 
really fight each other, but I finally got one I'm happy with.  Now I'm 
going to spin it :-)

Thanks for the inspiration.  Keep it up!



PM 2Ring wrote:
> Here's one of my attempts to get a globe vaguely like NASA's Blue Marble
> image
> at http://earthobservatory.nasa.gov/Newsroom/BlueMarble/
> 
> Suggestions welcome!
> 
> 
> ------------------------------------------------------------------------

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Bonsai <bon### [at] b0n541net> wrote:
> PM 2Ring wrote:
> > This engraved glass globe was done using normals... and a little dispersion.
>
> Very nice. Is it possible to get the source or a bigger version for
> destop background?

Thanks, Alain, Bonsai and Spock for your kind comments. I'll try tomorrow to
post the source, Bonsai. The problem is recreating the exact parameters,
because both of those glass globes were done with the same scene file...
I'm getting close, but I'm too tired, ATM.

In the meantime, here's a slightly larger one, using crackle.

#declare Shiny = finish{specular 1 roughness 3e-5}

#declare Reflective =
finish{
  Shiny
  //brilliance 3
  reflection {0.01, 1 fresnel on }
  ambient 0.1 diffuse 0.1
  conserve_energy
}

#declare TGlass =
texture{
  pigment{rgbf 1}
  finish{Reflective}
}

#declare TOcean =
texture{
  TGlass
}

#declare TLand =
texture{
  TGlass
  //normal{granite .1 scale  .025 bump_size 1}
  normal{crackle 1 scale  .025 bump_size 5}
}

#declare TPlanet =
texture {
  image_pattern{
    sys "EAlpha.bmp"
    map_type 1
    interpolate 2
  }
  texture_map
  {
    [.5 TOcean]
    [.5 TLand]
  }
}

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Bonsai <bon### [at] b0n541net> wrote:
> PM 2Ring wrote:
> > This engraved glass globe was done using normals... and a little dispersion.
>
> Very nice. Is it possible to get the source or a bigger version for
> destop background?

Ok, I've pretty-much reconstructed the scene file, although the photons are
not exactly the same. I think my area-light parameter AL needs to be
higher.

I only have a slow processor & 256M RAM here at home, so if someone would
like to render this at high AA 1024x768 and post it here, I would
appreciate it. I'm currently rendering a closeup version (comment out the *
1.5 in camera location).

// ----------------------------------------
// Persistence of Vision Ray Tracer Scene Description File
// File: EarthKA.pov
// Vers: 3.6
// Desc: Translucent globe of the Earth, 'engraved' using bump_map
//       Image file from NASA's Blue Marble page
//
// Date: 2004.11.23
// Auth: PM 2Ring
//
// +W1024 +H768 +A0.025 +AM2 +R4 -D
//
// -f -A0.5 +AM2 +R1
//

#version 3.6; //Uses photons, fresnel & conserve_energy: buggy in 3.5

#declare Radio = 1;
#declare Photons = 1;
#declare Area_Lights = 1;

global_settings {
  assumed_gamma #if(Radio) 1 #else .45 #end

  #if(Photons)
    #declare PhotonFile = "EarthKA.ph";
    photons{
      #if(file_exists(PhotonFile))
        load_file PhotonFile
      #else
        save_file PhotonFile
      #end

      count 180000 / 4
      autostop 0
    }
  #end

  #if(Radio)
    radiosity {
      //pretrace_start 0.08
      pretrace_end   0.04
      count 180 // 250

      error_bound 1.15      //default 1.8
      low_error_factor 0.6
      adc_bailout 0.01

      always_sample off
      //normal on
  }
  #end

  max_trace_level 50
}

// ---Camera & Lights----------------------

camera {
  location  <-0.25, .5, -5> * .89 * 1.5
  right     x*image_width/image_height up y
  direction 2*z
  look_at   0
}

light_source {
  <-8, 30, .75> * .125
  rgb 1

  #if(Area_Lights)
    #declare AL = 7; //21;
    #declare ASize = .2;
    area_light x*ASize, z*ASize, AL, AL
    adaptive 1 //3
    jitter
    circular
    orient
  #end

  photons {
    reflection on
    refraction on
    #if(Area_Lights) area_light #end
  }
}

// ---Textures-----------------------------

#declare Reflective =
finish{
  specular 1 roughness 1e-4
  //metallic
  reflection {0.01, 1 fresnel on}
  ambient 0 diffuse 0
  conserve_energy
}

#declare NLand =
normal{
  bump_map{
    jpeg "land_shallow_topo_2048.jpg"
    map_type 1
    interpolate 2

    bump_size 5
  }
}

// ---Objects------------------------------

#declare Globe =
sphere {
  0, 1

  texture{
    pigment{rgbf 1}
    finish{Reflective}
    normal{NLand}
  }

  interior{
    ior 1.5
    #if(1)
      dispersion 1.02
      dispersion_samples 5

      fade_color rgb<0,0,1>
      fade_distance  6
      fade_power 1001
    #end
    #if(!Photons)caustics .3 #end
  }

 photons {
  target
  refraction on
  reflection on
  collect off
 }

  //rotate y * 235      //Atlantic
  rotate y * -90        //Africa
  //rotate y * 62       //Australia
  rotate x * -6 // 22.5
}

#declare Rad = 10;
#declare Room =
union{
  sphere{0, Rad inverse }
  box{<-Rad, -2,-Rad>, <Rad, -1, Rad>}

  pigment{rgb .75}
  finish{ambient 0.05 diffuse .65}
}

//---Scene--------------------------------

object{Room}
object{Globe}

// ----------------------------------------

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All the spheres in this thread are great! 

Where do you get/generate the spherical mapping bitmap file?

Mike
--
http://povray.tashcorp.net

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Mike Kost <con### [at] povraytashcorpnet> wrote:
> All the spheres in this thread are great!

Thankyou! But we still haven't replicated the Blue Marble image...

> Where do you get/generate the spherical mapping bitmap file?

From NASA's Blue Marble page, mentioned in the opening post. There are all
sorts of fun maps there.

The one I've been using is

http://earthobservatory.nasa.gov/Newsroom/BlueMarble/Images/land_shallow_topo_2048.jpg
 (230 KB). There's also a 8192 by 4096 pixels (26.5 MB) TIFF version, if
you're really keen. :)

Here's a refractive translucent one, where the land & ocean have the same
transparency, unlike the first globe I posted.

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