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Ambient light is used to simulate the effect of inter-diffuse reflection
that is responsible for lighting areas that partially or completely lie in
shadow. POV-Ray provides the ambient_light keyword to let you
easily change the brightness of the ambient lighting without changing every
ambient value in all finish statements. It also lets you create interesting
effects by changing the color of the ambient light source. The syntax is:
global_settings { ambient_light COLOR }
The default is a white ambient light source set at rgb
<1,1,1>. Only the rgb components are used. The actual ambient
used is: Ambient = Finish_Ambient * Global_Ambient.
See section "Ambient" for more information.
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