here is a scene I did. No light. The trick to have this "shadows" is to 
put a very high ambient object to cast the "light"...here, the window is 
a white box with ambient set to 100.
It's the technic I use to produce radiosity lights...It's working quite 
good even if you need to do a very high count. To get the effect you 
want, you can add a real light with a small intensity (rgb 0.25 or less) 
to help the radiosity process and get a better result with less render time.

      David

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