Hello,
  When I use double_illuminate in a radiosity scene it does nothing (it 
does get double_illuminated by light_sources).
Here's a scene to illustrate:

default{finish{ambient 0}}
camera{location <3,4,5> look_at 0}
polygon{5,x,y,-x,-y,x pigment{rgb 1}double_illuminate translate  z}
polygon{5,x,y,-x,-y,x pigment{rgb 1}double_illuminate translate -z}
background{rgb z}
global_settings{radiosity{}}
sphere{-y/2,0.5 texture{pigment{rgb y}finish{ambient 10 diffuse 0}}}
light_source{y/2,rgb x}

Is it a bug or it is intentional?

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