"Chocolate Cake" <nomail@nomail> wrote:
> That's a great looking sky. Would you mind posting a small povray code example
> demonstrating how to achieve this effect? I am povray newbie :-I

The following code demonstrates the media effects for a single star.  (The star
looks different from the stars in the original posts because I used a simpler
function here.)  Have fun!

/* star_media_demo.pov
 *
 * Copyright 2012 Richard Callwood III.  All rights reserved.
 * Fair use or similar concept may apply in your country.
 *
 * 20-jan-2012  Created.
 */
#version 3.6;

global_settings
{  assumed_gamma 1
   max_trace_level 10
}

camera
{  orthographic
   right 320 * x
   up 240 * y
}

#declare C_STAR = rgb <1.000, 0.477, 0.154>; //3000K

#declare fn_Disc = function (x) { 1 / (1 + pow (x, 3)) }

#declare fn_Spike = function (x) { 1 / (1 + pow (x, 2)) }

#declare Disc = cylinder
{  0, z, 50
   hollow
   pigment { rgbt 1 }
   interior
   {  media
      {  emission C_STAR * 10
         density { function { fn_Disc (sqrt (x*x + y*y)) } }
      }
   }
}

#declare Diffraction_spike = box
{  <-100, -0.5, 0>, <100, 0.5, 1>
   hollow
   pigment { rgbt 1 }
   interior
   {  media
      {  emission C_STAR * 2
         density { function { fn_Spike (abs(x)) } }
      }
   }
}

object { Disc translate <0, 0, 1> }

object { Diffraction_spike rotate 45*z translate <0, 0, 2.1> }

object { Diffraction_spike rotate -45*z translate <0, 0, 3.2> }

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