> //Light to case shadows:
> light_source{
>     <15,25,-15>
>     rgb 0.7
>     area_light 4*x,4*y,8,8
>     circular
>     orient
>     jitter
>     adaptive 2
> }
> 
What kind of adaptive area_light is that? Adaptive 2 tries to start with a 5 by 
5 array, but your's is only 4 by 4... So the adaptive does nothing.
adaptive 0 start with a 2 by 2 array.
adaptive 1 with a 3 by 3
adaptive 2 with 5 by 5
adaptive 3 with 9 by 9
adaptive 4 with 17 by 17

The optimum array dimentions are: 5, 9, 17, 33, 65, 129, 257,...

-- 
Alain
-------------------------------------------------
OFFICE ARITHMETIC
Smart boss + smart employee = profit
Smart boss + dumb employee = production
Dumb boss + smart employee = promotion
Dumb boss + dumb employee = overtime

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