It's almost as if it expects the light group to have a pigment:
the no pigment given error is reported even when there are no objects in
the group.

Lutz-Peter Hooge wrote:
> 
> scattering media seems to be always and only illuminated by global
> light_sources, even if "global_lights off" is specified.
> 
> Also, Pov always gives a warning "no pigment type given" when using
> light_groups.
>

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