I read the docs many times, but couldn't find any reference to this
behaviour: light_sources inside a light_group do not cast shadows.

#declare Location = <0, 2, -4>;
#declare Look_at = <0, 0, 0>;

camera
{
  location  Location
  look_at   Look_at
}


#declare Thing=
text {ttf "arialbd.ttf" "TEXT" 1,0 pigment {rgb 1} translate -x-z/2}

light_group {

light_source
{ <-4, 0, -5>
  rgb 1.5
}

object {Thing}
torus {1.75,0.25 pigment {rgb 1}}

}



--
Jonathan.

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