JRG wrote:
> 
> 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.

> light_group {
> 
> light_source
> { <-4, 0, -5>
>   rgb 1.5
> }
> 
> object {Thing}
> torus {1.75,0.25 pigment {rgb 1}}
> 
> }

Your objects are part of the light_group.
I would expect light_group to behave as the old 'look_like'
extension: no self-shadow on the group.

Try putting your objects OUTSIDE of the light_group, it should work.

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