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As Warp pointed out, a sky-blue tinge to shadows is perfectly normal, and
exactly what you see in real life on a sunny day with a clear sky.
However, you can adjust gray_threshold in the radiosity settings. This
specifies how much colour to include in the radiosity calculations (1 = no
colours, 0 = full colour radiosity). Obviously, if you get rid of the sky
colour you will also lose colours emitted from nearby objects, so you can't
have it both ways I'm afraid!
One more point - it's best to set all objects' ambient to 0, otherwise they
actively emit light in radiosity calculations. If you have the global
ambient=3 then your scene must be really, really bright :)
Bill
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