My first guess is that POV-Ray always uses the same light direction (namely 
the vector from lightsource "main" location to the hitpoint) for the 
calculation of the lighting (diffuse, phong, etc.). Or it does this 
calculation only once (with a light source intensity calculated from all 
the shadow rays shot for each sub-light of the area_light). This would 
explain pritty much all of your effects. Also, if the light source is 
relativly far away from the illuminated objects it will not make a big 
difference as the vector only changes a bit.


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http://objects.povworld.org - the POV-Ray Objects Collection

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