"gregmcd" <gmc### [at] speakeasynet> wrote in message news:3dd40b42@news.povray.org...
> Hey Tom -
>
> Thanks for the note and suggestion. Your suggestion shows how it works and I
> get it, the problem I'm having is doing it in Moray.
>

BTW one thing to bear in mind with media is that, unlike most things in pov, it
is very scale-dependant.

By this I mean that if you scale all elements in a non-media scene by the same
amount, the scene will appear the same (a sphere of radius 1 viewed at a
distance of 10 units will look the same as a sphere of radius 10 viewed at a
distance of 100 units).

Try playing with the myScale value in the scene below, and note the alternative
line in the media definition that makes the media "scalable"....

// Persistence of Vision Ray Tracer Scene Description File
// File: ?.pov
// Vers: 3.5
// Desc: Basic Scene Example
// Date: mm/dd/yy
// Auth: ?
//

#version 3.5;

#declare myScale = 10;

#declare myMedia =
media {    // atmospheric media sample
  intervals 10
  scattering { 1, rgb 0.03} // this won't scale - as you scale up, the media
becomes more opaque..
  //scattering { 1, rgb 0.03/myScale } //..but this will scale since the media
is thinned.
  samples 1, 10
  confidence 0.9999
  variance 1/1000
  ratio 0.9
}

#include "colors.inc"
#include "textures.inc"

global_settings {
  assumed_gamma 1.0
}

camera {
  location  <0.0, 0, -50.0>*myScale
  look_at   <0.0, 0,  0.0>
}

light_source {
  0*x
  color rgb <1,1,1>
  translate <40, 80,0>*myScale
}

plane{-z,-50 pigment{brick} scale myScale}

sphere{0,5 pigment{bozo pigment_map{[0 White][1 Black]}} translate x*10 scale
myScale}
sphere{0,5 pigment{rgbf 1} interior{media{myMedia}} hollow translate x*-10 scale
myScale}

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