> I added radiosity, and they seem to come from that. Without radiosity
> the landscape remains totally dark whatever the value for EXP and the
> hour of the day.

Thinking about, you can have light_sources and still use radiosity can't 
you? In that case I don't see any benefit to using a sphere for the sun 
over using a light_source (even an area_light if you want realistic soft 
shadows).

The only reason I left the sphere object in there is because in mcpov 
you can't use light_sources, you are forced to model a sun as a very 
bright sphere.

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