Here is a scene I'm having trouble with.  What I'm trying to do is
create a clear light bulb with a glowing filament inside of it that
gives off light.  As I understand it, having the emission in there
should make it give off light.  However, unless I put in an additional
outside light source, all I see of the scene is that emitting cylinder.
Does it have anything to do with how I defined the light bulb?  Or is it
the media statement? Am I missing something simple?  Or am I way off and
have no clue?  Thanks in advance for any assistance.

Kevin Jackson-Mead

#include "glass.inc"

global_settings {
 max_trace_level 5
}

camera {
 location <2, 5, -10>
 look_at 0
}

//light_source { <50, 50, -100> color rgb 1 }

#declare Light_Bulb_Part1 = merge {
 sphere { 0, 1 }
 cylinder { z, 0, 1
  scale <0.35, 0.35, 1>
  translate 0.5*z
 }
}

#declare Light_Bulb_Part2 = merge {
 sphere { 0, 1.05 }
 cylinder { z, 0, 1.05
  scale <0.35, 0.35, 1>
  translate 0.7*z
 }
}

#declare Light_Bulb = difference {
 object { Light_Bulb_Part2 }
 object { Light_Bulb_Part1 }
 interior { I_Glass }
 texture { T_Glass3 }
}

#declare Filament = cylinder {
 -0.6*x, 0.6*x, 0.05
 material {
  texture {
  pigment { color rgb 1 transmit 1 }
  finish { ambient 0 diffuse 0 }
 }
 interior { media { emission 15 intervals 10 density { wrinkles
density_map {[0 color rgb 1] [1 color rgb 0]}} } }
 }
 hollow
}

union {
 object { Light_Bulb }
 object { Filament }
 rotate y*120
}

plane { y, -4
 pigment { checker color rgb x, color rgb y }
}

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