Kari Kivisalo wrote:
> 
> Should be like:
> 
> light_source{
>   <2.5,2.5,1>
>   rgb 1/0.75*M
>   spotlight radius 10 falloff 30 tightness 1 point_at<-2.5,-2.5,-1>
> }

All right, i already assumed something like that.

This effect is cause by the clipping of prediction values (stored
illuminance values plus gradients) in ra_average_near() (line 461 ff. in
radiosit.cpp).  I am not completely sure why this clipping is used but i
suppose it was meant to reduce artefacts when there was no
Maximum_Sample_Brightness yet.  Using max_sample you can achieve about the
same effect.

Christoph

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