>> > This render at 1280x1024 took 51m to render... Before I figured out how 
>> > to
>> > use light_groups, it took over 5 hours!
>>
>> Just when you think you at least *know* about all the main
>> objects and concepts ... I completely overlooked light_groups.
>> Thanks for mentioning, they sound quite useful ;)
>
> My thoughts exactly! :)
> And very nice detailed ship!

Thanks for all the comments. Its nice to be appreciated!

light_groups only work properly if you put the light_sources directly in the 
light_group. They don't work properly if you put your lights inside a CSG 
like a union as I usually do...

Taking an example scene with two union, one of which has some internal 
lights...

union
{
    ...
    light_source{...}
    light_source{...}
}
union
{
    ...
}

In the following example this will work and render much faster...

light_group
{
    union
    {
        ...
    }
    light_source{...}
    light_source{...}
}
union
{
    ...
}

But in the following example this will work (i.e. the lights will only apply 
to the first union) but render in the same time as the first example...

light_group
{
    union
    {
        ...
        light_source{...}
        light_source{...}
    }
}
union
{
    ...
}

Rarius

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