Francois Labreque wrote:

>Look at shadows on fresh snow.

The snow in the shadows has a bluish tint, the rest of the snow is 
"white". The general lightning is white, due to atmospheric scattering the 
shadow is blue.
When radiosity rendering with a blue sky_sphere it is as if the light is 
blue. The snow and the shadow are blue.

This is why I stated: "In the real world there is no direct "colour-
bleeding" from the blue sky", probably needed to put more emphasis on 
"direct".



Ingo

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