Further to my earlier post... POVRay 3.6.1c manages to render the file in 
11m41s with the lights included against 3.7.0.beta19 in 18m41s.

Rarius

"Rarius" <rar### [at] rariuscouk> wrote in message 
news:45c28f26$1@news.povray.org...
>I have a large complex model which takes a 40s to render at 320x240 with 
>two external light sources, but takes over 18m to render if I add in the 8 
>lights within the object.  The model is totally CSG with no reflection or 
>refraction.  I have used Phong and standard procedural textures.
>
> To speed up the render I thought I'd use light_groups to limit the effect 
> of the lights to nearby parts of the model.  Although it does limit the 
> effect of the lights, unfortunately this has made no effect to the render 
> times...
>
> Is there a gotcha with light_groups I am missing?
>
> Can anyone suggest any other solutions?
>
> Here is a snippet of my code showing how the light_group is being used...
>
> union
> {
>    object{UpperHead translate<50, 0, 0>}
>    object{LowerHead translate<50, 0, 0>}
>    light_group
>    {
>        object{MidHead translate<50, 0, 0>}
>        light_group{MidHeadLights translate<50, 0, 0>}
>        global_lights on
>    }
>    object{Neck translate<0, 0, 3>}
>    object{Engines translate<-65, 0, 3>}
>    object{Pods translate<0, 0, 0>}
> }
>
> Each of the objects (UpperHead, etc.) is a #local of a large CSG. 
> MidHeadLights is a #local of a union of the 8 light_sources.
>
> BTW I am using POVRay 3.7.0.beta.19/msvc8-sse2.win32 running on WinXP SP2, 
> on a PentiumD (2x2.8GHz), with 1Gb DDR Ram.
>
> Rarius
>

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