In article <3bee69bf@news.povray.org>, ruy### [at] hipernetcombr says...

> global_lights set to off, how come the white light still interacts with the
> sphere, causing it to cast a shadow on the plane? 

Even worse: a global light will cast a shadow from an object A in 
lightgroup X on an object B in lightgroup Y, but another object C in 
lightgroup X  wich is directly behind B (from the view of A), will not be 
shadowed by A, neither by the global light, nor by a light_source in 
light_group X, wich is in the same location as the global light. 
"global_lights off" is specified for X. 

Irritating, isn't it ;-)

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